bluuebunny/crossref_metadata_2025 huggingface dataset:
Automotive Interior Noise Analysis and Optimization Subjected to Different Road Excitations
Authors: Niu Hao Long , Wang Qing Chun , Wang Yu Xin , Fu Jian Rong
Published: February 2011

The automotive interior noise subjected to different road excitations was analyzed with finite element simulation method, according to the analysis results of panel acoustic contribution; acoustic property of the vehicle was optimized. Firstly, B and C grade road spectra were generated by MATLAB. Secondly, the frequency response results of body structure subjected to different road excitations were computed by MSC.NASTRAN, and the response results were imported in LMS Virtual. Lab as velocity boundary condition via the coupling between the body structure and cab cavity, and the sound pressure level (SPL) around driver’s ears was predicted by using Acoustic Transfer Vector (ATV) technology. Also, the impact of cavity structure surface impedance on the interior noise was discussed, and the noise characteristics subjected to different road spectra were compared. And the contributions of body panels to the noise levels around the driver’s ears were achieved via panel acoustic contribution analysis (PACA). Finally, taking the vibration velocity of panels as the main goal, the body structure was optimized to reduce the automotive interior noise.
Fault Diagnosis for Low-Speed Rolling Bearing Using Stress Wave and Wavelet Analysis
Authors: Zhou Bo , An Yun Ling , Chen Chang Zheng
Published: February 2011

The properties of the SW and its transmission law in the low-speed rolling bearing were studied in this paper. Firstly, the three-dimension contact model of the bearing was set up. The defects which occurred on the outer race were simulated in the model. According to the model, the stress, the strain and the contact stress distribution was computed. Then, the stress and strain distribution law and the contact stress distribution law of the interface on good and fault bearing were compared. In the real-world testing, fault signals were acquired using stress wave transducer. Fault characteristic parameters were extracted and the background noise was reduced using wavelet analysis. Both simulation and real-world testing result obtained indicate that SW and wavelet transform can be the effective method in the fault diagnosis of low-speed bearing.
Analysis of Transverse Vibration of Circular Plates with an Elastically Mounted Mass Based on Combination of GDQM and FEM
Authors: Li Ping , Wang Ying
Published: February 2011

The generalized differential quadrature method (GDQM) developed recently is more and more widely used in structural analysis, but that is restricted by some conditions. The finite element method (FEM) is a conventional numerical method, but the calculational work is very great. In this paper, the GDQM and the FEM are combined together to analyze the transverse vibration of circular plates with an elastically mounted mass. The results show that this combination is a new way first proposed in this paper to solve the problems with complex domains in structural analysis. And it is a rapid, efficient, accurate and flexible numerical method with both the advantages of the GDQM and the FEM. Comparison with the existing literature has proved that the results obtained by this method are very accurate.
The Nonlinear Magneto-Elastic Vibration and Stability of Current-Conducting Thin Plate in Longitudinal Magnetic Field
Authors: Hu Yu Da , Li Bai Zhou , Du Guo Jun
Published: February 2011

Based on the Maxwell equation and Kirchhoff assumption of thin plate, nonlinear magneto-elastic vibration equation, electrodynamics equation and electromagnetic force expressions of current-conducting thin plate were deduced. Furthermore, nonlinear super-harmonic resonance of thin beam-plate under lateral mechanical motive load in longitudinal magnetic field was studied. Considering the thin plate simply supported on two opposite sides, the magneto-elastic coupled vibration differential equations about function of displacement of vibration and electric field intensity were obtained by the method of Galerkin. Then, the amplitude-frequency response equation under super-harmonic resonance was derived by using method of Multiple scales. Correspondingly the stability of stable solution was analyzed. Through the numerical calculation, characteristic curves of amplitude changing with detuning parameter, the excitation amplitude and the magnetic intensity. At last, the influence of electric-magnetic and mechanic parameter on resonance phenomenon and stability of solution was analyzed.
Research of Nonlinear Primary Resonance of Damped Circular Sandwich Plates with Initial Deflection
Authors: Du Guo Jun , Liu Xiao Man , Hu Yu Da
Published: February 2011

The nonlinear forced vibration of damped circular sandwich plates is studied. From the movement equations of circular sandwich plate expressed in displacement components, got the relevant nonlinear vibration equation by Galerkin method. The standard Duffing equation with square and cubic minor items was obtained by dimensionless processed. The quadratic analytical solution of the principal resonance was deduced by multi-scale method. The FRF of primary resonance periodical solutions were obtained, synchronously the necessary and sufficient condition on stability of the vibration are obtained. The infection to the amplitude when the correlative physical and geometric parameters changing was discussed. The trajectories in moving phase planes during the stabilization process, the stabilities and singularities of the solutions are analyzed.
Based on Preference Front Wheel Alignment Parameters Robust Design
Authors: Zhang Lei , Dong En Guo
Published: February 2011

In order to obtain comprehensive robustness, preference function is applied on front wheel alignment parameter design. Two kinds of uncertainty factors have been integrated into the overall preference function. Random uncertainty is adopted by classical robust design method, and epistemic uncertainty such as individual preference is adopted by range method. The model of front wheel alignment parameters is established applying preference function. The optimal objective is composed of the minimum swing angle of front wheel during wheel bumping, the minimum slider during driving straightly, and the minimum steering angle error during steering. The optimum results are shown robustness on front wheel alignment parameter based on preference function is improved.
Research on Optimization for the Piston Pin
Authors: Wang Yan Xia , Gao Hui
Published: February 2011

Due to the fatigue failure and the fracture injury occurs under the alternative mechanical loads, the optimal design of the piston pin is presented depending on the FEA static analysis. The optimization is carried out using the Genetic Algorithm (GA), and the piston noncircular pin hole is used to further reduce the stress concentration on the upper end of the piston pin seat.
Tests on Mechanics Parameters of HEC Concrete and its Capabilities under Contact Blast
Authors: Tao Xi Gui , Li Sho Hong , Yu Jiang , Li Er Bing
Published: February 2011

High strength and water stability earth consolidator (HEC) is a kind of hydraulic cementing material. In order to get mechanics and contact blast capability of HEC concrete, flexural and compressive strength parameters were obtained, and the model tests were carried out on HEC concrete under contact blast. The tests above show that HEC concrete has good mechanics and anti-blast capability is about half a time higher than that of normal C30 concrete.
The Influence of Crack on the Sound and Vibration Characteristic of Gear Structure
Authors: Shao Ren Ping , Xu Zhi Feng , Ma Jie
Published: February 2011

The gear structure is equivalent to disposed as a circinal plate, and also, reference circle cracks of gear are simulated by setting the arc direction crack. Because of the appearing of crack, it will divide the whole circinal plate into some areas, and set different polynomials of vibrational flexibility in every area, then using District Technology and Rayleigh-Ritz method, the dynamical characteristic of circinal plate with arc direction crack is analyzed, the influence of the type and size of crack on dynamical characteristic(natural frequency, modal shape etc.)of circinal plate are deep studied. On this basis, making use of Finite element method, the first some order mode of the acoustic character of cracked plate are investigated using discrete Rayleigh integral, and the distribution of sound pressure on the r=0.5m sphere surface is obtained. At the same time, the influence of different depth of crack on acoustic characteristic of gear disc are discussed, and the rule of influence of crack on radiated acoustic field is given out. This result shows that the influence of crack on radiated acoustic field of circinal plate with the increase crack depth is increscent. These provide a theoretic foundation for gear fault diagnosis using the dynamic and acoustic method in engineering.
Optimization Design of Tank Structure for Semi-Trailers
Authors: Zhao Shuang , Wang Jing Gang , Dai Li Li , Deng Ya Qiong , Miao Jiao
Published: February 2011

The research is conducted on the tank of semi-trailers which is made of steel by using the method of Finite Element Analysis. The optimized result indicated that the mass of the tank structure reduced by 9% on the premise that the intensity and the rigidity request of structural property is satisfied, and the dynamic characteristic also meets the requirement. It is the foundation to reduce the cost of manufacture and improve the operational effectiveness of user.
The Robust Optimization Design for Breaking Spring of Spring Actuator of Vacuum Circuit Breaker
Authors: Sun Bo , Chen Gang , Liu Xiao Ming , Wang Er Zhi
Published: February 2011

In this paper, the concept of robust optimization design for the breaking spring of spring actuator of vacuum circuit breaker is presented. The function, that is to minimize the error and maximal variations of spring stiffness coefficient related with structure parameters and its tolerances, is chosen as the objective function, and the acceptable region of the tolerances is formed by some constraints. The optimum parameters of the breaking spring are given by solving the nonlinear programming problem with multi-target and two-level optimization, and the optimization results are discussed.
A Simple Synthesis Method for Spherical 4R Linkages Reaching Four Positions
Authors: Yang Tong , Han Jian You , Yin Lai Rong
Published: February 2011

For spherical 4R linkage synthesis reaching four specified task positions, we introduce a simple derivation method of spherical Burmester curve equation by employing a displacement matrix method. Then we presented a method to calculate the coordinates of circle and center points, so the spherical Burmester curves can be drawn by the software developed.
Optimization Design of Beam Pumping Unit Based on Response Surface Method
Authors: Yang Xiu Juan , Yan Tao , Yan Xiang Zhen
Published: February 2011

An optimization design method is developed for the beam pumping unit, which is based on the API-RP-11L design criteria. The Response Surface Method is used to calculate the structural reliability of the beam pumping unit. The optimization design method not only provides an efficient and fast optimization tool for the modular design of the beam pumping unit, but also offers an integral design calculation in accordance with the API design code. The function and theory of this optimization design method are given by this paper, as well as some concrete calculation examples.
A Numerical Integration Method of Dynamic Finite Element Analysis
Authors: Liang Xing Pei
Published: February 2011

A new numerical integration method for dynamic finite element analysis is proposed in the paper. In the proposed algorithm, the acceleration change in a particular time step is first assumed to be curved variation, and then the displacement vector, velocity vector and acceleration vector at the current instance can be expressed in terms of the results at last time instance. Because of the curvilinear property of the acceleration change in a particular time interval, the complicated dynamical responding such as high-oscillatory modes can be captured with the present method. The efficiency and accuracy of the proposed algorithm are validated by two numerical examples and numerical results show that the present formulation has better accuracy than the Wilson’s method and the Newmark’s method used in the conventional finite element method.
Failure Analysis of Flail Knife on Aluminum Scrap Impact Crusher
Authors: He Qing Zhong , Wang Jia , Wang Ming Chao
Published: February 2011

Flail knife is one consumable part of aluminum scrap impact crusher made in Germany. In order to lower production cost, localized production of flail knife has been researched. Flail knife in steel 42CrMo has been developed instead of that of Germany. In course of using, neck of the self-developed flail knife has been broke up and fractured. For seeking the reason of failure, microstructure and mechanical properties of new flail knife has been analyzed, and force condition has been calculated by finite element analysis, heat treatment process and installation technology has been investigated. The reason of failure in flail knife has been summarized, and the heat treatment process optimized has been designed and took good effect.
Structure Improvement of the Principal Axis of a CNC Vertical Boring-Milling Machine
Authors: Luo Qing Hai , Peng Wen Wu , Zhang Peng Fei
Published: February 2011

The rigidity of the principal axis of a CNC vertical boring-milling machine was analyzed, and the belt tension and end deformation were also calculated. A project was proposed to improve the structure of the principal axis for finish machining. After the discharge belt pulley was applied on the principal axis, the force transmission and the rigidity of principal axle system were improved considerably. The design and process means were proposed for the three added parts of the improved structure. The improved structure is simplified, secure and low-cost. The machining precision was increased, and the fixing was also become convenient.
Multi-Objective Inversion Design of Cutting Head by Hard Rock Boring Machine Based on Fuzzy Theory and Genetic Algorithms
Authors: Zhang Qiang , Song Qiu Shuang , Li Shou Ju , Tian Ying
Published: February 2011

Along with the shearer's developed in the mining process, especially the rock tunnel boring roadway driving has become a major factor restricting the efficiency of coal, development of a suitable rock tunnel boring machine is very important, this paper use of rock excavation and after the release of stress concentration broken rock rolling theory, inverse problem approach using indirect parameters of the cutting head of, on the cutting head of the energy efficiency and the lowest maximum, minimum tool wear characteristics of multi-objective, were normalized, transformed into single objective problem, a genetic algorithm. The results showed that: the inversion of multi-objective design method is feasible to design a new type of driving hard rock cutting efficiency of institutions to provide 9%, compared with 20% reduction in energy consumption, lower tool wear 55.2% for the rock tunnel excavation needs.
The Numerical Simulation and Experiment on Temperature Field in ICF Driver’s Target Building
Authors: Zhou Yi , Liao Yun Fei , He Jie
Published: February 2011

The spatial temperature distribution in the target range of the ICF driver is one of the key factors, which affects the precision optical components and equipment for normal operation. Application of the basic theory of heat transfer, this paper has discussed the fluid motion mathematical model in ICF driver middle target range. With the aid of finite element analysis software FLUENT, the temperature Numerical Analysis Model has been established. In accordance with assuming the numerical simulation boundary condition, spatial temperature field distribution in the target range intermediate level has calculated. The results indicate that the target range intermediate level temperature field is uniform basically. The temperature fluctuation scope is in a tiny range around 23°C about in the entire space. Although the maximum gradient of temperature achieves 1.2°C in existence heat source region, it is in the range of temperature indicators. This indicates that the present HVAC system can satisfy the request. By analyzing, the results of numerical analysis are in good agreement with experimental results, because the error is only 0.2%.
Overhang Effect on the Contact State between the Three-Point Bending Specimen and Supports in Hopkinson Bar
Authors: Guo Chun Huan
Published: February 2011

The effect of specimen overhang on contact state between specimen and supports has been investigated by analyzing stress wave propagation in loading bar, specimen, and supports in Hopkinson bar. The results show that the time for loss of contact decreases with increasing overhang. The criterion is obtained for keeping the specimen contact with supports under a fixed of the specimen thickness and width.
Dynamics Research of Ultrasonic Peristaltic Micro-Fluid Driving Model
Authors: Zhang Dan Dan , Wei Shou Shui , Wang Guo Lei , Wei Chang Zhi
Published: February 2011

A new ultrasonic peristaltic micro-fluid driving model was presented on the principle of ultrasonic traveling wave and volume displacing mechanism. First, driving principle of the model was introduced and finite element model was developed. Second, the transient dynamics analysis was performed to observe the chambers traveling and the fluid flowing. What’s more, harmonic analysis was done to get its amplitude-frequency response characteristics. Third,the coupling modes filled with fluid was performed to prove its drivng effect. This can provide a guidance for furture fluid structure analysis to get better performance and efficiency.
Modeling of Load Distribution in Large-Size Wind Turbine Blade Bearings
Authors: Shang Zhen Guo , Gao Tian Yi , Wang Hua
Published: February 2011

This paper proposes a procedure for obtaining the load distribution in a four point contact wind turbine blade bearing considering the effect of the structure’s elasticity. The uneven stiffness of the rings and the supporting structures creates a variation with respect to the results obtained with a rigid model. It is necessary to evaluate the effect of the elasticity on the increase in the contact forces in order to be able to design the wind turbine blade bearing and the structures involved in the connection. A finite element model (FEM) has been created for the global model, having also represented the rolling elements and their contact with the raceways. The results obtained using the FEM have been compared with the traditional Hertz contact results.
Kinematics Analysis of 6-DOF Transportation Vibration Platform
Authors: Zhu Yan , Zhu Shi Shun , Wang Guo Jun , Liu Xu Gang
Published: February 2011

Based on the principle of Space Mechanism, the kinematics model of 6-DOF transportation vibration platform is described, and system kinematics analysis and calculation are finished. With an example, the displacement of actuator is solved according to the position and orientation of moving platform. The kinematics analysis is the basis of deciding system motion parameters, motion trajectory planning and system dynamics analysis.
Preliminary Studies on Carbon Sequestration Changes of Wood Materials in Manufacturing Process
Authors: Shi Lan Cui , Xu Min
Published: February 2011

In this paper, we initially inspected the carbon storage changes of wood materials in manufacturing process combined energy consumption and material loss of wood materials in manufacturing process, analysed carbon sequestration potential of wood materials, and demonstrated the role of using wood in reducing CO2 emission and mitigating climate warming.
Design and Experimental Study of the Vibration Control Device for Large Spatial Structure
Authors: Wang She Liang , Dai Jian Bo , Zhao Xiang , Miao Lu Lu
Published: February 2011

According to active vibration control of the large spatial structure, a vibration control device called giant magnetostrictive material actuator was designed which could convert electromagnetic energy into mechanical energy. This device take giant magnetostrictive material as the core component and make full use of its magnetic properties like big force output, fast response, high reliability and low driving voltage. Then its principle and design method was analyzed, and output performance tests were done. The results show that this device have good magnetic circuit structure, high efficiency of energy conversion, and could output larger force and displacement under the drive current with linear relationship sensitively, and lay a good foundation for its application in the large spatial structure.
The NAVMI Factor and Natural Frequency of a Circular Plate Exposed to Water in Flexural Vibration
Authors: Ren Hui Juan , Sheng Mei Ping
Published: February 2011

The expression of NAVMI factor and the natural frequency of a circular plate, which is placed in a hole of an infinite grid wall with one side exposed to water, are derived from the viewpoint of the additional mass. 10 Nodes Gauss-Legender integration method and the iteration method are employed to obtain the numerical results of the NAVMI factors, AVMI factors and the natural frequencies. It can be found from the results that NAVMI factors of the first two order modes are far bigger than those of the other modes when the boundary condition of a circular plate is certain. The first two order modal NAVMI factors of the circular plate with clamped and simply supported boundary conditions are far bigger than those of the circular plate with free-edged boundary condition, and the NAVMI factors are almost the same for the three order or much higher order modes regardless of the boundary condition. It is also observed that the natural frequencies of the circular plate exposed to water are smaller than those exposed to air, and the natural frequencies of the circular plate exposed to water with both sides are smaller than those of the circular plate exposed to water with one side.
Force Control of a Constrained One-Link Flexible Arm with Internal Damping
Authors: Liu Liang Yih , Lin Hsiung Cheng
Published: February 2011

In this paper, the contact force control of a constrained one-link flexible arm is fully investigated using a linear distributed parameter model including the internal damping of Kelvin-Voight type. To overcome the inherent limitations caused by the non-minimum phase nature of the noncollocation of the joint torque input and the contact force output, a minimum phase transfer function is deduced by using the feedback and the output redefinition. A PD controller is then designed to accomplish the regulation of the contact force. Therefore, asymptotic tracking of a desired contact force trajectory with internal stability can be achieved. With the infinite product of transcendental functions, exact solutions of the noncollocated infinite-dimensional closed-loop force control system can be obtained so that it is free from spillover problems with stability robustness to parameter uncertainties. Numerical simulations are provided to verify the effectiveness of the proposed approach.
Research of Gas Heater with Different Intermediate Heat Carrier Medium
Authors: Guo Yun
Published: February 2011

The gas heater, reliable as it is, is nevertheless slow in getting started, and is one of the low-efficiency energy consumption equipments adopting the indirect heating by the intermediate heat carrier medium. Apparently, the form of heat transfer process of the intermediate heat carrier medium, i.e. the flow field organization in the large capacity cylinder, is one of the key elements that can improve the thermal efficiency of gas heater. Experimental investigation and analysis of the flow condition and temperature distribution between the water and ethylene glycol in the cylinder were carried out. Based on the investigations on medium selection and heater’s integral structure and combining with the engineering practical needs, effective measures to improve the efficiency of gas heaters have been brought forward in this article and the technology has got itself the China patents.
Analysis of Thermal Resistence for High-Power Light-Emitting Diodes
Authors: Zhu Wei Tao , Pan Kai Lin , Ren Guo Tao , Wang Jiao Pin , Liu Jing
Published: February 2011

This paper measures the LED thermal resistance characteristic by thermal transient tester (T3Ster) obtained the cumulative structure functions curve and differential structure functions curve. The actual K factor and optical power are obtained by testingⅠ. The thermal resistance characteristic of each layer for LED structure are analyzed by testingⅡ in different cases. The experimental results show that the bonding method and the heat sink size have tremendous influence on the LED thermal resistance’s reduce, and the contact thermal resistance takes up a great proportion in LED total thermal resistance. The contact thermal resistance may reduce by pressure on interface and by a change of the attach material and the roughness of interface.
Numerical Modeling and Simulation Analysis of Temperature Field of Disc Brake on Trains
Authors: Wang Guo Shun , Fu Rong , Zhao Liang
Published: February 2011

The simulation calculation on the temperature field of the disc brake system on high-speed trains under the working condition of constant speed at 50Km/h is made. A steady-state calculation model is established according to the actual geometric size of a brake disc and a brake pad, and the analog calculation and simulation on the temperature field of the brake disc and the brake pad by using the large-scale nonlinear finite element software ABAQUS are carried out. The distribution rules of the temperature field of the brake disc and the brake pad under the working condition of constant speed are made known. The surface temperature of the brake disc at friction radius is the highest, with a band distribution for temperature. There exists a temperature flex point in the direction of thickness, of which the thickness occupies 15% of that of the brake disc; due to the small volume of the brake pad, the temperature gradient of the whole brake pad is not sharp, and larger temperature gradient occurs only on the contact surface.
The Impact of Hybrid Ventilation on Thermal and Energy Performance in Hot and Humid Weather
Authors: Song Jia Fang
Published: February 2011

In this paper, the simulation software was applied to evaluate a hybrid ventilated combined mechanical and naturally ventilated (atrium area to be naturally ventilated) building. In order to understand the impact of the usage of natural ventilation on thermal comfort in atrium, we utilized TAS to simulate the air temperature and air velocity distribution for the atrium. A modeled three-storey commercial office building was used as the main subject of this analysis. To determine the thermal comfort level of the central atrium, Parameters will be set in such a way that the full height windows will be 100% open. Results were tabularized to determine and analysis the output of the simulation. Recommendations will be then given based on the output performance of the building.
Numerical Investigation into Thermal Behavior of Brushless Permanent Magnet Motors
Authors: Fu Lung Ming , Lin Chiufeng , Chang Chin Lung , Chang Jenhao , Tsai Chien Hsiung
Published: February 2011

The performance of brushless permanent magnet motor for electric vehicle applications is simulated by commercial CFD codes Fluent 6.3. It is difficult to model motor winding area and to well pose the motor external boundary conditions for using CFD method. A possible approach to simplify the thermal resistance computation is to use an empirical equivalent thermal conductivity of the system winding impregnation and insulation. The empirical equivalent thermal conductivity is case sensitive and regressed in the experiment. The same is true for the boundary condition of motor. In this paper, we proposed a new model to compute equivalent thermal conductivity and overcome the above problem. This model takes advantage of the packing bed heat transfer model proposed by Zehner and Schlünder. Besides, the boundary conditions are also obtained by the numerical experiments. The validity of CFD method using in the present paper is validated utilizing the experimental data. The numerical data are concurred with the experimental data. As a result, the CFD method is shown to be a feasible method for modern thermal design for brushless permanent magnet motor.
Comparisons on Flow and Temperature Fields for Water-Collecting Box of Diesel Exhaust System
Authors: Wang Xiao Chuan , He Guo , Pan Xing Long , Shi Xiao Ying
Published: February 2011

The storage cells of conventional submarines are usually charged up by in the snorkeling state, when the diesel engines that charge the storage cells work underwater. The reverse flow of sea water into the diesel engine from the exhaust pipelines can be avoided effectively by using a water-collecting box (WCB), which has other functions as well. In this paper, a three-dimensional model of WCB was established and based on which the flow and temperature fields were studied by computational fluid dynamics (CFD) computations. From the comparison of distribution on interior fields for four different structural WCBs, an optimized scheme of enhancing the cooling effect and not raising the exhausting resistance was probed. The results show that the temperature drop of exhaust gas after washing the WCB IV (WCB with truncated tubes) is 40 percent higher than that of the WCB I, and the pressure drop has a low of 3 percent as well. The comprehensive characteristics of WCB IV are foremost between the four WCBs.
The Optimal Structural Parameters of Embedded High-Power Microwave Components Based on RSM-GA
Authors: Chen Pin , Wu Zhao Hua , Zhang Sheng , Bi Tang Wen , Xiong Qing Song
Published: February 2011

In the thermal design of embedded high-power chips microwave modules, structural parameter is one of the main reasons affect the thermal resistance, thus influences the reliability of the modules, the structural parameter optimized of the microwave components was studied in this paper. The goal of this work is to decrease the temperature and achieves the best structural dimensions. Using the ANSYS software build the EPCM module, through simulation analysis, Linear regression equation be fitted by RSM, which concerning the module maximum temperature with board area, substrate thickness, molybdenum thickness and encapsulation thickness. Based on genetic algorithms, structural parameter optimization algorithm of thermal model was proposed and the optimization structural parameter of embedded high-power chips microwave modules was achieved by corresponding optimization program. Based on ANSYS work, before optimization the model of maximum temperature is 86.717°C, the maximum temperature module of the optimization structural parameter is lower 1.28°C than before, so the thermal resistance decreased. The result show that the maximum temperature module of the optimization structural parameter is in good accord with the FEA results. It turns out that the RSM –GA approach proposed in this work can be effective and robust in providing structural parameter optimization in EPCM.
Finite Element Analysis on the Influence of Back-Up Ring on the Sealing Effect of Rubber O-Ring
Authors: Li Dian Xin , Zhao Hong Lin , Zhang Shi Min , Wu Chang Run , Liu Xian Long , Zheng Shan Jun
Published: February 2011

Based on finite element analysis software ANSYS, the deformation and force condition of the rubber sealing o-ring pre and post with back-up ring under different oil pressure conditions was analyzed. The von mises stress distribution of the o-ring and the change of contact pressure between o-ring and sealing interface pre and post with back-up ring under different oil pressure conditions were discussed. The results show that, the maximum von mises stress of the o-ring is smaller and the maximum von mises stress of the sealing system concentrates on the left top and the right bottom of the back-up ring after using it; the o-ring will not be extruded into the gap of the groove because of the existence of back-up ring which prevents gap-bite and prolongs service life of the o-ring; the contact pressure between o-ring and sealing interface increased, thus the sealing reliability of the system increased.
Finite Element Analysis on Frame-Type Hydraulic Press
Authors: Bi Da Sen , Liu Dan Dan , Chu Liang , Zhang Jian
Published: February 2011

Hydraulic press is important pressure processing equipment, which has a wide range of applications in production and manufacturing industry. The structure of hydraulic press frame has an extremely significant effect on safety and usability. Against the structure of frame-type hydraulic press in this paper, a solid model has been built with CAD program Pro/E and the hydraulic press frame under working conditions is simulated by finite element simulation program ANSYS. This paper analyses the variation of stress, strain and frame deformation under working conditions, and the dangerous sections of hydraulic press frame can be found under the maximum work load. The research results show: The maximum value of effective strain and effective stress can be found in the screw holes of cylinder port, the maximum value of stress and strain in the direction of hydrocylinder force can be found in the confluence of upright column and lower beam, the maximum value of effective displacement and the displacement in the direction of hydrocylinder force can be found in cylinder port and part of upper beam.
Application of ADAMS in Course Teaching of Mechanism
Authors: Chen Wen Jia , Zhang Jiang
Published: February 2011

Automatic Dynamic Analysis of Mechanical System (ADAMS) provides a powerful modeling and simulating environment that helps people to build, simulate, refine, and ultimately optimize any mechanical system. In the classroom teaching of mechanism course, to use ADAMS to show the establishment and movement of all kinds of mechanisms and their simulation process of kinematics and kinetics as a demonstration will significantly enrich students' perceptual knowledge, enlighten and guide students cogitation, stimulate their interests in mechanism thereby enhance the effectiveness of course teaching.
The Application of Virtual Prototyping Technology on On-Off Pressure Mechanism of Printing Press
Authors: Wang Xiao Hua , Qi Yuan Sheng , Wang Xiao Hua
Published: February 2011

The mechanism of on-off pressure is an important component in press. The paper study and analyse the three-point support type mechanism of on-off pressure, by building the 3D digital model and using the software of ADAMS. The paper find out the law of motion of the mechanism, and put forward the suggestions for improvement.
Study on the Microstructure and Performance of New Type Martensite Wear Resistant Steel
Authors: Wang Jia , He Qing Zhong , Hu Yong , Wang Ming Chao
Published: February 2011

The new low alloy martensitic wear resistant steel 25Si2MnNi3 and steel 53Si2MnNi3 are developed, which hardness are about HB450 and HB600 respectively, the impact abrasive wear resistance of new low alloy steel relative to high manganese steel ZGMn13 is investigated on MLD-10 type impact abrasive wear tester under the different impact energy, and the wear mechanism is analyzed. As a result, the new low alloy martensitic steel which impact toughness is well always obtains better impact abrasive wear resistance than that of steel ZGMn13 under different impact energy, and the primary wear mechanism gradually changes from micro-ploughing and micro-cutting to micro-fatigue and micro-cracking with impact energy increasing.
Analysis of the Cultivation Mode of Chinese Exemplary Engineering Innovators
Authors: Sun Jing , Xu Wen Ji , Wang Dian Long
Published: February 2011

All countries of the world carry forward progress in engineering education reform actively to meet the keen demand of innovative engineering talents which results from the global industry development, the source from which the global engineering excellence research project stems. Firstly, this paper reviews the origin and prophase research results of exemplary engineering innovators (EEI) research project. Secondly, this paper provides a systematic and comprehensive introduction to the industry-oriented EEI cultivation mode for bachelor’s degree engineering practiced in Mechanical Design & Manufacturing and its Automation of Dalian University of Technology based on an analysis of the cultivation actuality of EEI. Finally, this paper puts forward advices to form EEI cultivation mode with Chinese characteristics.
Enterprise Multi-Project Selection Evaluation Based on Fuzzy Optimal Model
Authors: Xiao Ji Jun , Liu Xiao Jun , Gao Zhi Jian
Published: February 2011

There are many factors to affect Enterprise project selection, but each type of factor’s status and their evaluation are accompanied by the obvious fuzziness. According to considerations in the project selection, this paper has built Project Selection Index; Through the use of fuzzy optimization model, turning a variety of fuzzy or subjective factor that into the mathematical form, and quantitative analysis of project selection index, and that enabling enterprises multi-project evaluation and selection are more scientific, reasonable and reliable.
Realization of Power Supply and Optimization in Telemetry System
Authors: Chen Yan Ran , Zhang Hui Xin , Zhan Jian Hua
Published: February 2011

In the telemetry system of aviation, the reliability and stability of the power supply equipment directly influences the performance of the system. Based on XC2S100 and MAX153, this paper designs a reliability and stability power supply and voltage remote real-time monitor platform ,at the same time ,because of the power supply equipment only working continued which is a waste for the telemetry system, this paper put forward a the optimization schemes.
The Coupling Support Technology for Y Style Large Span Intersection in Deep Soft Rock Roadway
Authors: Li Zhan Jin , Zhao Xue Li , Zhang Yang
Published: February 2011

Because of crossing point’s large span, stress concentration clearly, result in parts of the intersection of poor support, construction and maintenance difficult, especially Y-Intersection is more serious part of deformation and failure. Through situ investigation and theoretical research, summarize the typical failure modes of the deep large Y-intersection, analyze the main reasons for destruction of the crossing point that is both sides of Bovine unconstrained and supported respectively. The new coupling supporting design—bolt-mesh-cable + truss to control the top of crossing point , while the key technology of the double control bolt is used to control the Crossing point.—is proposed.
Application of GA-FNC in Crystallizer Liquid Level Control System
Authors: Li Ming , Yang Da Yong
Published: February 2011

This article discusses the control strategy of the steel casting system which possesses the characteristics of large inertia, time-varying and nonlinear. Aiming at getting the minimum deviation of liquid level, the control strategy uses the genetic algorithm to off-line optimize the parameters (cij,bj) of the Gaussian membership function and the network structure of fuzzy controller which affect the overall system firstly. Then, BP algorithm is used to online regulate and optimize the weight parameters of the control output which affect the system partly. Finally, the intelligent control system of the liquid level which is based on GA-FNC is simulated. The results show that the method can enhance the ability of self-learning and robustness of the system greatly and improve the stability of steel casting system significantly.
The Superwater Using to Control Slime Pulp in Packing Paper and Optimize Close System of Whitewater
Authors: Du Fei , Li Zhi Jian , Fan Xiao Ming
Published: February 2011

This article introduced the superwater’s action principle for controlling slime pulp and its virtues. And then it studied its bactericidal and ameliorative actions in close system of whitewater. The article also compared superwater with other conventional bactericides. At the use level, concentration, actuation duration and bactericidal ability, superwater system excelled conventional bactericides. Furthermore the superwater can improve a series of problems in close system of whitewater. At last, a pilot scale test about superwater system has been carried out in a packing paper company. The test indicated that the superwater in whitewater can increase yield and save cost.
Investigation of Sol-Gel Technique to Prepare ITO Films Using Orthogonal Experiment
Authors: Liu Jie , Liu Jing , Wu Xu , Yang Bin
Published: February 2011

Transparent and conductive ITO thin films were prepared on quartz glasses by the sol-gel dip-coating method. This process is affected by factors such as doping level of tin, number of dip-coatings (layers or thickness of film), withdrawal speed, annealing temperature and time. The effects of each factor at 5 levels on the properties of ITO films has been studied and optimized using the method of orthogonal experiments (L25(5)5). Quantitative analysis of the parameters in the orthogonal array design was performed and the results indicate that when the sheet resistance and transmittance are the two targets, the optimum experimental conditions are: mol ratio of Sn: In: 1/10, number of dip-coatings: 8, withdrawal speed: 200 mm/min, annealing temperature: 550°C and time: 70 minutes. To validate the project, another experiment was performed under the above conditions to determine the best performance of ITO film. The test results show that the sheet resistance is 125Ω/γ and transmittance is 86.2%, which meets the expected aim.
Electron Emission from Ferroelectric Cathode
Authors: Wang Qiu Ping , Tang Shuai , Huang Xu Dong , Yu Hua Wa , Yan Xiang An
Published: February 2011

The technology of (Pb,La)(Zr,Ti)O3(PLZT) ferroelectric cathode is introduced. Stable emission current and high current density are obtained from it driven by positive high-voltage pulses with a repetition rate of 80 Hz. Proximity-imaging techniques are used to record the electron beam spot shape.
Virtual Machining of Spiral Bevel Gear Based on VERICUT
Authors: Wang Yong , Zhao Lin , Kou Jin Bao
Published: February 2011

Spiral bevel gear milling machine is one typical representative of complex manufacturing equipments. In order to simulate spiral bevel gear cutting, a five-axis virtual CNC gear cutting machine under VERICUT software is established in this paper. Based on a spiral bevel gear generating theory, the surface forming of the spiral bevel gear is studied by using coordinate transformation method in spatial kinematics, and the G-code required by actual gear cutting is generated. Then, according to the properties of the general five-axis CNC system, the machine model and the relevant configuration parameters under VERICUT is created, so the spiral bevel gear virtual NC machining system is set up. Finally, the cutting simulation and crash examination are accomplished under VERICUT. By using this method, the accuracy of the bevel gear cutting system based on a general five-axis CNC can be well verified.
Simulated Analysis of Flow and Deformation in Trilateral Constrained and Asymmetric Square Cup Deep-Drawing
Authors: Huang Li Cheng , Xiao Xiao Ting , Tan Li Guang , Li Guo Liang
Published: February 2011

To satisfy the local forming need of sheet-metal part, numerical simulation of SUS304 stainless steel deep-drawing with trilateral constrained slot were carried out by employing the analytical software ETA/dynaform5.5. The influence of different friction coefficient and holder force on the forming quality was analyzed by taking the inflow volume while parts forming 50mm as standard. The results show that the effect of trilateral constraint on the uneven flow and deformation of flange. And some measures were illustrated to improve the quality of some of these parts.
Influence of Fining Temperature on Glass Qualities
Authors: Liu Xiao Qing , Xie Jun Lin
Published: February 2011

To study the influence of fining temperature on glass qualities, different fining temperatures from 1400°C to 1500°C were used to prepare a series soda-lime-silica glass with identical chemical compositions. Infrared spectroscopy was used to determine the water content of glass, general analyzer of melt physical properties was used to study the viscosity and surface tension change of glass melt, microscope was carried out find glass bubbles, wet chemical analyses were used to determine the Fe2+/(Fe2++Fe3+) ratio. The results show that, generally, with the increase of fining temperature, the glass melt’s water content, bubbles number and Fe2+/(Fe2++Fe3+) ratio increase, viscosity decreases. Particularly, when the fining temperature is 1450°C, the glass has lowest water content, bubbles number, Fe2+/(Fe2++Fe3+) ratio, and viscosity, and its surface tension is largest. Among all tested fining temperature, 1450°C is the optimal fining temperature.
Strain Gradient Finite Element Analysis of Size Dependence of Thermal Stresses in Through-Silicon Vias (TSVs)
Authors: Jiang Wu Gui , Xu Cheng , Yu Jian Fei , Wang Jian Shan
Published: February 2011

Through-Silicon Vias (TSVs) technology, which is widely used in three-dimensional (3D) Microsystems packaging, has been investigated by using a strain gradient finite element method (FEM). A thermomechanical strain gradient constitutive law was embedded into the commercial software ABAQUS to consider the size dependence of thermal stresses in TSVs. Our numerical results show that when both thicknesses of SiO2 dielectric layer and Si substrate are kept to a constant, for a given via depth/radius ratio, the Mises stress decreases with the decrease in the radius above 100 nm, and then it increases markedly with the further decrease in the via radius below 100 nm, which is not consistent with the results obtained by the conventional FEM. It is also shown that as the whole size of the TSV structures is scaled down proportionally, for a given via depth/radius ratio, the peak Mises stresses are almost size scale- independent above 100 nm and exhibit a strong size scale effect below 100 nm.
Effect of M-ZrO2 on Sintering Behavior and Thermal Shock Resistance of Dense Cr2O3 Material
Authors: Yin Hong Ji , Zhang Tao , Wu Ai Jun , Wang Jin Xiang
Published: February 2011

The samples were prepared using Cr2O3 micropowder, TiO2 micropowder and m-ZrO2 micropowder as main starting material, polyvinyl alcohol as binder, by a series of processes such as pulping, spraying granulation, machine moulding and cold isostatic pressing, and sintering at 1 500°С for 3 h in nitrogen protected atmosphere furnace (oxygen partial pressure was 10 Pa). Then thermal shock resistance of the samples was tested by wind quenching. Effect of m-ZrO2 (2%-5% in mass) on sintering behavior and thermal shock resistance of Cr2O3 material was investigated. The results show that m-ZrO2 can accelerate the sintering of Cr2O3 material, but excess 2 wt% m-ZrO2 doesn’t work; m-ZrO2 can obviously improve thermal shock resistance of Cr2O3 material, sample containing 3 wt% m-ZrO2 has 34 wind quenching cycles from 1 150°С to room temperature, and sample without m-ZrO2 only has 11 cycles.
Simulation Research on Matching of Spray and Combustion Chamber Geometry in Diesel Engine
Authors: Zhang Cheng Cheng , Wang Qian , He Zhi Xia , Jiang Ping
Published: February 2011

In order to investigate the influence of combustion chamber geometry on spray and combustion characteristics in diesel engine, universal CFD software STAR-CD is applied to simulate the combustion processes in three different types of combustion chambers of diesel engine. The effect of combustion chamber geometry on in–cylinder air motion, temperature field and exhaust emissions are researched in this paper. Comparing with experimental results, calculation models are proved to be validity. The results show that differences of combustion chamber shape change the characteristic of flow field in cylinder, which affects the formation of mixed gas and determines the combustion and emission characteristics.