bluuebunny/crossref_metadata_2025 huggingface dataset:
Luminescence and Scintillation Properties of Ce-Doped YAP and LuYAP Crystals
Authors: Phunpueok Akapong , Chewpraditkul Weerapong , Limsuwan Pichet , Wanarak Chalerm
Published: February 2011

The luminescence and gamma-ray detection properties of cerium-doped scintillators, namely, Lu0.3Y0.7AlO3:Ce (Lu0.3Y0.7AP:Ce), Lu0.7Y0.3AlO3:Ce (Lu0.7Y0.3AP:Ce ), and YAlO3:Ce (YAP:Ce) were investigated. UV excitation and emission spectra of studied crystals were compared. The light yield and energy resolution were measured using photomultiplier tube (PMT) readout. The light yield non-proportionality and energy resolution versus gamma-ray energy were measured and the intrinsic resolution of the crystals was determined after correcting the measured energy resolution for PMT statistics. For 662 keV gamma rays (137Cs source), YAP: Ce showed the highest light yield of 28,500 ph/MeV and the best energy resolution of 4.4 % , while its photofraction is worst.
Microring Resonator Chemical Sensor Based on Si3N4 Waveguides
Authors: Chen Yao
Published: February 2011

Microring resonator based on Si3N4 waveguides was fabricated by using CMOS compatible processes with 1 µm wide waveguides and 200 µm in radius. The optical characteristic of the resonator was measured with a Q factor up to 20,000 and a free spectrum range (FSR) of 1 nm. The structure was further packaged to be a sensor for liquid sensing. Finally, the sensor was applied to detect concentrations of glucose solutions with sensitivity of 1.78×10-5 refractive index unit (RIU), which proves its functionality and feasible application as high sensitivity chemical sensor.
The Preparation and Application of Chitosan Derivatives for Ni Coating on ABS
Authors: Tang Xue Jiao , Wang Jin Gang , Shen Bo Xiong
Published: February 2011

The chitosan derivatives(S-CTS and RS-CTS) were prepared and the application of the derivatives in surface activation process for Ni electroless plating was exploited. S-CTS was prepared by shiff-base reaction of CTS with salicylic aldehyde and RS-CTS was prepared by reduction reaction of S-CTS with KBH4. The results of FT-IR spectroscopic characterization showing the formation of C＝N in S-CTS and C－N in RS-CTS indicated that the above reactions occurred in the supposed route. The thermal properties of the derivatives were studied by Thermogravimetry-Differential thermal analysis (TG-DTA) methods. It is suggested that the thermal stabilities of CTS derivatives were better than that of CTS. Furthermore, RS-CTS is capable of forming even films on ABS surface and adsorbing adequate Ni nano-catalysts for follow-up electroless plating. Optic tight and dense plating layers were finally obtained. It is showed that RS-CTS could be applied as a biopolymer film in activation process for electroless plating.
Development and Validation of Mathematical Model for Gas Transmission through Thin Film
Authors: Ban Zhao Jun , Feng Jian Hua , Li Xi Hong , Li Li
Published: February 2011

A mathematical model to predict oxygen, carbon dioxide, and water vapour exchanges in non-perforated and micro-perforated thin films in modified atmosphere packaging system has successfully been proposed. Validation of the mathematical model was found to yield good prediction for gas exchanges in the mass of the produce after comparison with the experimental results of modified atmosphere packaging for Lycopersicon esculentum fruit.
Dynamic Analysis for Derailment Safety of High-Speed Railway Vehicle Bogies
Authors: Chen Chern Hwa , Cheng Yung Chang , Yang Shun Chin , Lin Yuh Yi , Chang Cheng Hsin , Yeh Jiin Po , Yang Che Yun
Published: February 2011

Based on the heuristic nonlinear creep model, the nonlinear coupled differential equations of the motion of a 12 degree-of-freedom (12-DOF) bogie system which takes account of the lateral displacement, vertical displacement, the roll angle and the yaw angle of the each wheelset and the bogie frame, moving on curved tracks are derived. The nonlinear creep forces and moments are constructed via the saturation constant of the nonlinear creep model in completeness. The effect of the suspension parameters of a bogie system on the derailment quotient is investigated. Results obtained in this study show that the derailment quotient of a bogie system increases as the vehicle speed increases. In addition, the derailment quotient of a bogie system is generally decreased with the increasing values of suspension parameters.
Kinematics Analysis of the Wedge Clamping Device of PET Bottle Blowing Machines
Authors: Zou Teng An , Pan Cun Yun , Xu Xiao Jun , Zhang Xiang
Published: February 2011

In the current pin clamping device of bottle blowing machines, the design datum can’t coincide with mold datum. So it not only needs a pressure compensation device, but requires clamping holes to meet high precision. It makes the clamping device manufacturing and maintenance cost high. On the other hand, the producing plastic bottles have obvious mold lines. It affects products quality. For the above shortcomings, this paper designs a wedge clamping device, and then analyzes the kinematics modeling of planar moving cam mechanism and plane linkage mechanism. The results show that the device has smooth operation and small impact. So the new wedge device can meet the job requirements of high-speed rotary bottle blowing machines.
Preparation and Kinetics of Wood-Based Ni-P Coating Electromagnetic Shielding Material by Ytterbium-Improved Electroless Plating
Authors: Jiang Bo Quan , Liu Yu De , Zeng Jiang Nan , Zhang Wen Long
Published: February 2011

A wood-based Ni-P coating electromagnetic shielding material was prepared in an ytterbium oxide-added electroless plating bath. The kinetic model was established and confirmed to be in accord with the experiment and can be used to predict the deposition rate within a certain range. The experimental results showed that the Ni-P coating prepared with the addition of Yb2O3 were smoother, denser and brighter than that prepared without addition of Yb2O3. The deposition rate and electromagnetic shielding effectiveness of the former were 2.662mol×10-4/(cm2h) and 56.48 dB which is about 13% and 9% higher than those of the latter under the same bath compositions and operation conditions.
Computing Method of Reliability Sensitivity under Independent Multi-Failure Modes
Authors: Yan Ming , Tang Le , Zheng Peng , Wang Shi Jie
Published: February 2011

To improve the reliability effectively, the reliability sensitivity method is researched with considering that a mechanical system or component may fail in many modes, which is simplified to be a series system model. It is supposed that all ultimate state functions in multi-failure modes are normal distribution. A computation module for total reliability is established. A kind of computation method for reliability sensitivity in multi-failure modes is built based on that in single failure mode. A pin connection component that may fail in shear fracture, bruise on pin or hole surfaces, or in any assemble with two different modes is computed, and the reliability and sensitivity of the component are estimated. Consequently, it is found that the most effective method to enhance the reliability was to enhance the crushing strength of the pin.
Reliability Assessment for Small Sample Based on Interval Degradation Data
Authors: Zhao Wei Tao , Yao Dong Lin , Zhang Wei Ping
Published: February 2011

Based on reliability analysis theory, traditional interval reliability analysis method is improved by take the smaller value of probability reliability and interval reliability as the results of reliability assessment, which makes the reliability assessment results more fit engineering cases. The improved model is applied to reliability assessment of small sample products with degradation characteristics, and results of assessment are compared with existing methods. A numerical example is considered, the results show that the assessment results by the method proposed in the paper is reasonable and believable.
Analysis of Particle Motion in Vertical Shaft Impact Crusher Rotor
Authors: Duan De Rong , Wang Song , Zhao Fang , Su Dong Ning
Published: February 2011

The rotor of vertical shaft impact crusher was modeled by SolidWorks and imported into EDEM for dynamic simulation. The average speed, maximum speed, average force, maximum force with time were analyzed in rotor, so the true law of particles motion in rotor would be revealed, indicated that the speed of particle field in rotor increased with the rotor radius at the time of rotor work steady, about 80% of the particles were accelerated to the maximum speed, and the change of speed affected significantly the particle interactions.
A Review of Reliability Principles in Conceptual Design
Authors: Cui Yu Lian , Wu Wei
Published: February 2011

In this paper an attempt has been made to identify certain useful parts that will assist to consider reliability during conceptual design phase. The aim is to provide some thoughts and a toolkit for addressing reliability during the early stages of design, influencing design decisions and product reliability, and reducing the relying on the reliability prediction and expensive experiments in later design stage. Therefore high reliability can be cost-effectively achieved.
Reliability Study of Thin Seam Hearer Cutting Unit under Multi-Condition
Authors: Zhao Li Juan , Sun Zhong Gang
Published: February 2011

Application of a variety of software construct co-simulation environment, establishment of model of thin seam shearer cutting unit rigid-flexible coupling multimode system, do correctness verification to model from speed characteristics and mechanical properties. Simulation by loading, get characteristics of principal stress and weak links of key parts. Compared to the prototype model simulation under multi-condition, got the best traction speed of shearer when working in a particular coal seam. Axis of the planet given to different materials to comparative simulation and comprehensive analysis, given the best materials of planetary shaft should be selected, improved the reliability of planetary axis under poor conditions.
Screw Relibility Design Based on the Linear Second Order Moment Method
Authors: Yu Quan Yu , Zhu Cheng , Wang Zi Wen
Published: February 2011

Because lacking of enough data to define distributions of stress and strength of machine components,it is difficult tocalculate the reliability of the component by aid of numerical integra- tion. This paper explains that, if we knew means and standard deviations of the stress and strength, we can work out reliability coefficient (β), and illustrate the design principle of linear second order moment method by means of the screw design example.
Effect of Counterpart's Surface Micromorphology on Tribological Behavior of Nylon under Dry Sliding Contact
Authors: Huang Chuan Hui , Ding Ming , Zhu Hua
Published: February 2011

This paper investigated the friction and wear behaviors of nylon rubbing against steel discs with helical, parallel and multidirectional textures respectively. The results indicated that friction coefficient, friction temperature and wear rate of couple using helical texture steel disc as counterpart were higher than others. Abrasive wear was the primary mechanism of the three couples. Nylon surface roughness increased after rubbing against helical texture steel disc, but decreased after rubbing against parallel and multidirectional texture steel discs. The roughness of both helical and multidirectional texture steel discs increased slightly after test, while the roughness increase of parallel textual steel disc was significant only at regions perpendicular to the rotating direction due to adhesion of nylon transfer film.
Propulsive Efficiency Analysis on C-Start of Robot Fish
Authors: Chen Hong , Peng Jian Chun , Xu Gang
Published: February 2011

For improving fast-start performance of underwater propeller, the robot fish with high maneuverability is developed using the fish-like swimming mode characterized by undulatory flexible body. Through observations of C-start in crucian carp, the kinematic model of fast-start in robot fish is set up. According to hydrodynamic analysis on unsteady effect of added mass and wake vortices, liquid reaction forces on bionic fish-body are derived. Based on simulation experiment of C-start, propulsive performance indexes including kinetic energy, power and propulsion efficiency are presented respectively. The research results can provide theoretical basis of raising propulsive efficiency of C-start in subsequent underwater experiments, and optimization design of robot fish.
Effect of Cylinder Surface Treatment on Diesel Engine Performance
Authors: Guo Zhi Wei , Yuan Cheng Qing , Liu Peng , Yan Xin Ping
Published: February 2011

The cylinder-piston ring pair is one of the most important rubbing pairs of the internal combustion engine. The current studies showed that the micro geometry of friction surface morphology has a great effect on the performance. In this study, the terminological system of cylinder liner - piston ring was regarded as the object. The surface of each cylinder was treated with some pits and grooves. Then, the cylinder-piston ring experiments were implemented using a tester. The comparison analysis of vibration signals from diesel engine condition body surface and tribiological properties between conventional cylinder and a variety of surface treatment of cylinder was conducted. The effects of cylinder surface on diesel engine performance were investigated and some conclusions were obtained and presented in the paper.
Geometric Curve Design Method of Fuzzy Reliability Based on Random Processing Errors
Authors: Zhao Zhi Su , Zhang Xing Hua
Published: February 2011

In order to foresee the influence of random processing errors on geometric curve in design stage, meanwhile including success and failure process during the gradual change process in the forecast. Based on probabilistic fuzzy reliability point of view, the success or failure determination will be extended to fuzzy events. The geometric curve deign method will be also given when taking the impact of random engineering error into account. Related analysis formulae and the fuzzy criterion of success or failure of designing the curve process are established and derived. Through which, design and engineering process are integrated, the designer will be more reliably to predict the success or failure of the geometric curve design during the design stage. The processing error of lack of statistical data and the objectivity of the success or failure determination criterion will be easily solved. Economy cost and reliability design of geometrical curve design will be also considered.
Study on the Fretting Wear Failure in the Cylinder Block of a Diesel Engine
Authors: Huo Ping , Wang Jian Ping , Gao Rui Xiang
Published: February 2011

Fracture accidents often take place along the whole clapboard or block in cylinder block of diesel engine during its stand test. From the analysis of the macroscope fractography of the fracture plane and stress, it indicates that the failure of cylinder block was induced by the generation and extension of crack and local plastic deformation and the inching fretting fatigue are the main causes of crack initiation, while alternating cyclic load is the power of crack propagation. The paper represents some corresponding methods to prevent or avoid fracture accidents based on our profound research, and the study lays the reference and foundation for diesel engine design and testing.
Application of Model Based Diagnosis in Two-Span Rotor System with Two Unbalance Faults
Authors: Luo Yue Gang , Zhang Song He , Yao Hong Liang , Wen Bang Chun
Published: February 2011

The model based fault identification method was used to identify the two unbalance faults in two-span rotor system. The unbalance location and magnitude were identified using least squares fitting approach by the system’s transient residual vibration. The all-phasic FFT technique was used to analyze the original phases of vibration signals. The unbalance location and magnitude of the rotor system can be detected by using only a few sensors. Numerical simulations and experiment on rotor system with two unbalance faults were used, which proved the efficiency of the method.
Experimental Study on Hermetically-Sealed Construction and Ether-Resistance Materials in DME Engines
Authors: Huo Ping , Wang Jian Ping , Gao Rui Xiang
Published: February 2011

Considering the characteristics of Dimethyl ether(DME), such as low viscosity, strong dissolvability, swelling and ageing for usual rubber blankets, as well as mechanical property variation, some gum elastic parts could be corroded and lose their sealability. In order to avoid leak out of fuel feeding line and oil reserve tank, the taper face Hermetically-sealed construction was designed as the tube joint and the ether-resistance materials FM-1 was chosen as the sealant. And a gas impermeability experiment of joint was conducted to assess the tightness.
Effect of Blade Numbers on Aerodynamic Performance and Noise of Small Axial Flow Fan
Authors: Zhang Li , Jin Ying Zi
Published: February 2011

To more fully explore the effect of blade numbers on aerodynamic performance and noise of small axial flow fan, some solutions are adopted to obtain the parameters’ distribution of the flow field.Firstly, the standard k-ε turbulence model is used to calculate the steady flow field of six different fan blades(such as 5,7,9,11,13,15) , and the SIMPLE algorithm is applied to couple vecolity and pressure. Secondly, the large eddy simulation in conjunction with the FH-W noise model are used to compute the unsteady flow field and noise. Finally, the experimental results verify that the calculation methods of steady flow field and unsteady flow field are correct. The conclusions show: (1)Total pressure and efficiency generally maintain the trend of firstly increasing and then decreasing with increasing the blade numbers, and it is the greatest when fan blade number is 11. The flow rate coupled with the maximum efficiency has never changed with increasing the blade numbers. (2)With the increasing blades, overall sound pressure level of the aerodynamic noise is gradually decreasing near the outlet of fan tip, while it is firstly decreasing and then increasing before decreasing again 1 meter away from the central axis of the impeller along the outlet. When fan blade number is 11, overall sound pressure level of the aerodynamic noise is the greatest.
Research on the Effect of Fluid-Structure Interaction on Dynamic Response of Gate Structure
Authors: Gu Hua , Yan Gen Hua
Published: February 2011

This essay reveals that on the basis of fluid-structure interaction having appreciable impact on auto-vibration of gate structure, analysis and calculation on dynamic response characteristics of gate structural fluid-structure interaction have been conducted. The results indicate that under the same dynamic load the structural dynamic response value with fluid-structure interaction effect considered is remarkably larger than vibration response with fluid-structure interaction effect considering. The calculating results indicate that the largest response increase of typical parts of gate structure is from 50% to 60%. Therefore, as to making calculations on structural dynamic response with fluid-structure interaction effect, the impact flow field exerting on structural response should be taken into consideration.
Coupling Effects on Torsional Vibration with Clearance of a Two-Degree-of-Freedom System
Authors: Zahid Md. Hossain , Ovy Enaiyat Ghani
Published: February 2011

Two-degree-of-freedom vibro-impact model with clearance nonlinearity of torsional vibration is presented in this paper. Clearance in coupling in any rotating machinery can exhibit chaotic and multiple periodic phenomena. Coupling inertia also contributes to change the vibration characteristic significantly. In this paper, coupling effects, from a small inertia to large inertia compare to rotor, have been investigated for a wide frequency zone by simulation and some experiments focusing on resonance and bifurcation diagrams. As the spring in the clearance usually possesses quite low stiffness compared to shaft stiffness, symmetric and asymmetric characteristics can be exhibited. The results found are noticeably different from each other for the symmetric and asymmetric conditions. The presence of vibro-impact due to clearance can cause periodic, multiple periodic and chaotic motions.
Reducing Vibration Analysis on Travel Stabilizing System of Wheel Loader Based on ProE and ADAMS
Authors: Xu Ge Ning , Wu Bing
Published: February 2011

The mathematical vibration model of travel stabilizing system of wheel loader which was added to reduce spillage of material was built firstly. The equivalent stiffness and damping of travel stabilizing system were deduced, and influence factor was analyzed. In order to solver the characteristic parameter of the mathematical vibration model, the simulation method based on Pro/E and ADAMS was adopted. The result indicates selecting the appropriate parameter of accumulator is the important factor of the effect of travel stabilizing system. This paper is basic of further research on travel stabilizing system.
Estimation of Random Sonic Fatigue Life Based on Peak Probability Density of Von Mises Stress
Authors: Sha Yun Dong , Zhang Zhen , Zhao Feng Tong , Wei Jing
Published: February 2011

As to the random sonic fatigue problem of thin walled structure of aerospace flight vehicle, estimation method for fatigue life based on Von Mises stress peak probability density is investigated. Assuming that Von Mises stress process satisfies three-parameter Weibull distribution, the peak probability density function of Von Mises stress is derived through the threshold crossing analysis and the peak distribution analysis of stationary random process. According to the Miner linear cumulative damage theory, the method for estimating the fatigue life in the frequency domain is established with the Von Mises stress peak probability density function applied. As an example, an aero-engine Combustor liner is considered, using coupled Finite Element Method (FEM) and Boundary Element Method (BEM) method, the structure vibration response to limited bandwidth Gaussian white noise is calculated. Based on the results, fatigue life of the structure is estimated by using the proposed method. Further more, the influences of the probability density function which is characterized by three-parameter Weibull distribution and two-parameter Weibull distribution respectivily for Von Mises stress response of the Combustor liner structure subjected to random accoustic loadings are discussed.
Analytical Solution of Lamb Wave Scattering at Plate End
Authors: Feng Fei Long , Shen Jian Zhong , Deng Jing Jun , Wang Qiu Ping
Published: February 2011

An analytical solution based on modal decomposition is presented to investigate Lamb wave scattering at plate end. Take boundary condition into biorthogonality relation, a matrix equation is established with all matrix elements have analytical expressions. The scattering feature is then expressed in matrix form, named as reflection matrix, which has explicit expression composed of those matrixes. Calculation examples have be implemented when antisymmetric modes are reflected. Scattering coefficients are figured out in a range when frequency-thickness product vary from 0 to 8kHzm, to prove the calculation efficiency. The calculation precision is very close to the least square method based on model discretization.
Analysis of Vibration Mode of Hydraulic Gate Structure
Authors: Gu Hua , Yan Gen Hua
Published: February 2011

It is generally existed that the vibration problem of hydraulic gate structure during water conservancy project, whose vibratory magnitude is closely related to inherent feature of gate structure and spectrum signature of hydrodynamic loads. In this project, through contrastive analysis of modal test procedure of multi-support excitation and single-point response as well as finite element computational analysis, test model and finite element model of some hydraulic sector gate had been built to indicate the results of modal test were basically close with that of finite element model, the changing frequency being the same. Both of them could truly reflect the dynamic characteristics of gate, which proved it effective that the methods for researching on vibration modes of hydraulic gate adopted and provided important basis for further dynamics research and design optimization.
Supply Chain Revenue Coordination Mechanism Based on Game and Lead Time Compression with 3PL Intervention
Authors: Lv Qin , Huo Jia Zhen , Gao Jun Jun
Published: February 2011

A revenue coordination problem of supply chain based on lead time compression is discussed. The coordination problem involves in a supply chain consisted of a manufacturer, a third-party logistics and a vendor. The vendor implements a lot-partitioning supply model. The third-party logistics undertakes the delivery. The supply chain gains Lead time compression with lead time crashing. According to different cooperative modes, Stackelberg leader-follower game models are established to gain the optimal costs of the buyer, the vendor and the supply chain system. A decision principle is designed to compare the cost savings of the buyer, the vendor, the third-party logistics and the system. A best mode is singled out according to the decision principle.
Game Analysis of Selecting Manufacturing Service Modes for Manufacturers
Authors: Zhang Xu Mei , Tong Jie , Zhao Min , Guo Jia Rong
Published: February 2011

This analysis details manufacturers’ choices of self-service and outsourcing service modes, and the factors which influence manufacturers’ mode selection and pricing decisions, such as customer distribution for high-end and low-end markets, customer utility evaluation and transfer costs are analyzed in the frame work of the Hotelling model. The results indicate that customer utility evaluation for manufacturers’ self-service mode should be enhanced when manufacturers select this mode. And it is important for manufacturers who choose outsourcing service mode to improve service quality considering customer personal needs, expand differentiation of outsourcing services.
Research on Resource Optimization of Block Erection Procedure Based on PSO
Authors: Zhong Yu Guang , Hang Li Jie , Shi Wei Min
Published: February 2011

The resource optimization of ship erection procedure is a classic NP-hard problem. Through analyzing the character about this problem, an algorithm model of Particle Swarm Optimization (PSO) is proposed. Particle’s coordinate in the particle swarm is used for the activity’s actual start time and methods for resource leveling based on dynamic time variance are designed. Evolution equations based on integer compute rule is introduced to improve the converging speed and accuracy of traditional PSO algorithm. The last simulation experiment with the practical data demonstrates the feasibility and the effectiveness of the improved PSO algorithm by comparisons and analyses.
Online Due Date Strategy on Mass Customization
Authors: Pang Ru Ying , Liu Da Cheng , Li Qiang
Published: February 2011

In order to make response rapidly for customization demand and reduce the cost, this paper studied the due date strategies between MTS stage and MTO stage of mass customization supply chain. We consider the sequencing and due date of a series of orders that arrive at MTO stage over time. Using of queuing theory, the paper puts forward SPTA-DE algorithm which is the on-line heuristic algorithm of orders scheduling and due date quotation. And, the paper make comparative analyses on the due date and cost for the SPTA- DE heuristic algorithm and FCFS algorithm under the various control parameters, and draws constructive conclusions.
Research on Evaluation and Decision-Making Model of Product Design Scheme Based on TFN-AHP-GRA
Authors: Yang Xiao An , Deng Qian , Sun Guang Long , Wang Bing Bing
Published: February 2011

In view of (Considering)the fuzziness of attribute information in process of scheme design for electromechanical product emphasizing both form and function, the construction methods of evaluation index during evaluation and decision-making on the scheme is studied, the construction methods of evaluation index system based on technology, aesthetics, economy and society is proposed, and the comprehensive evaluation and decision-making model of product design scheme that integrates Analytical Hierarchy Process(AHP), Triangular Fuzzy Numbers(TFN),and Gray Relating Analyze (GRA) is established. With evaluating and decision-making on three electric hair dryer cases, the effectiveness of the model and method is demonstrated indirectly by the contrast between the result and the share of sales of three electric hair dryers on the market.
Form Generation Model of Two Thinking Paths
Authors: Tseng Sei Wo Winger , Chang Teng Wen , Lin Ji Hong
Published: February 2011

A model of two thinking paths is developed in this article. Early researchers of computer aided for product design focused their attention on sensation of consumers on product appearance to meet the consumer need. However, these generative rules of digital form did not consider the thinking process during design concept development. The experiment was designed to explore the concept transformation of two thinking patterns, and the shape generation in design thinking developing. The martini wine cup had been selected as a design target to collect the data. The model of two thinking paths was then developed based on results of the design thinking experiment. An experimental system, called thinking pattern-based generation system, a.l.a. ThinkGen, was then implemented to test the model.
Uncertainty Quantification of a Flapping Airfoil with a Stochastic Velocity Deviation Based on a Surrogate Model
Authors: Zhao Liang Yu , Zhang Xia Qing
Published: February 2011

A practical flapping wing micro aerial vehicle should have ability to withstand stochastic deviations of flight velocities. The responses of the time-averaged thrust coefficient and the propulsive efficiency with respect to a stochastic flight velocity deviation under Gauss distribution were numerically investigated using a classic Monte Carlo method. The response surface method was employed to surrogate the high fidelity model to save computational cost. It is observed that both of the time-averaged thrust coefficient and the propulsive efficiency obey a Gauss-like but not the exact Gauss distribution. The effect caused by the velocity deviation on the time-averaged thrust coefficient is larger than the one on the propulsive efficiency.
The Optimal Design of Work Location for a RRR 3-DoF Manipulator
Authors: Tian Shi Xiang , Wang Sheng Ze
Published: February 2011

In this paper, an algorithm is proposed to determine the optimal work location to minimize the sum of the joint angle. The algorithm use the sum of the three joint angle as the objective function, through analysis of workable domain, coordinates transformation, globe search, to get the optimal work position of the manipulator. Simulation shows that the proposed algorithm works well for stipulated aim.
The Elementary Exploration on Teaching Reform of Training Center of Engineering
Authors: Ma Yu Ping , Yuan Gen Fu , Yao Yan Sheng
Published: February 2011

The present defects of the teaching practice in training centers of engineering in the local engineering colleges and universities are introduced. The construction of ideas, teaching methods and means of reform of engineering training teaching system should be along with the needs of the global economy competition. How to play the full role of the training center of engineering for cultivating the capacity-building of engineering students is a hot topic. The training center of engineering of School of Mechanical and Electrical Engineering in Anhui Institute of Architecture and Industry was taken as an example to illustrate the teaching practice and explore the teaching reform methods and the countermeasures.
Aerodynamic Analysis of Pickup Truck
Authors: Qi Xiao Ni , Meng Jian , Liu Yong Qi
Published: February 2011

The present study focuses on the aerodynamics of pickup trucks. The CFD software FLUENT was used to simulate flow field around a pickup truck in this paper. Numerical simulation was taken on a 1/5th pickup truck model. The surface pressure distribution, the wake velocity distribution of the special profiles and the flow structures were obtained. The research indicted that there was a recirculation flow region over the bed for pickup truck. The cab shear layer did not interact directly with the tailgate, flowing above the top of the tailgate. There was a downwash flow in the symmetry plane behind the tailgate with no reverse flow region in the symmetry plane, and the formation of two smaller recirculation flow regions was on both sides of the symmetry plane. Mean flow fields in the near wake of the cab showed a weak pair of counter-rotating vortices behind the cab. In the cross-flow planes behind the tailgate, the mean flow fields show strong counter-rotating vortices behind the tailgate. Instantaneous flow fields in the cross-flow planes of the pickup truck near wake showed compact vortex structures located randomly in space.
Reliability-Based Robust Optimization Design for Lattice Tower Structure
Authors: Jiang Xin , Li Hui Jian , Gao Bai Feng , Liang Xi
Published: February 2011

Reliability Analysis is applied into tower structural design and influence of uncertain factors is considered into the design. The reliability robust optimization mathematical model of tower structure is established by combining the reliability optimization designing theory with the robust design method and injecting reliability sensitivity into the design model. The reliability sensitivity is added to the reliability-based optimization design model and the stiffness reliability-based robust design is reduced to a multi-objection optimization. Take the lattice tower structure for example, after designing, it shows not only lighter weigh, saving in material, simplifying construction, but also improving its safety and stability. The example proves the method to be effective.
The Gradual Optimization Automatic Mathematic in the Job-Shop Environment
Authors: Li Jing Sheng , Wang Ai Min , Tang Cheng Tong
Published: February 2011

The aim of scheduling is getting a production plan to guide the shop working. Scheduling has become a key part of realizing CIMS along with the modern production development. Thus it can be seen that the position of scheduling in manufacture is extraordinary important. So a practical method must be proposed for the real production environment. The gradual optimize scheduling is proposed to save this problem.
Study on Reinforcement Scheme of Foundation Underpinning Technology for Accident Buildings in Loess Region
Authors: Hu Yu Ding , Wang Yan
Published: February 2011

In this article, the author makes a study on the etiology of accident buildings and summarizes the similarity of them in the loess region. Meanwhile, the underpinning technology and ground treatment method in Loess Region has been researched. Then recommend several strengthening methods of the underpinning which suit for similar accident buildings in Loess Region. Finally, the article points out that there as on able selection of the Underpinning reinforcement Scheme must consider the damage reasons and the feature of the building in loess region and the construction environment and the economic factors.
Investigation into the Cutting Technology of the Ineterior Helical Surface of Metallic Screw Pump Stator
Authors: Ding Qing Xin , Cui Hong Qun , Lou Xiao Zhong , Dong Xue Zhe , Liu Zhi , Hui Kun Liang
Published: February 2011

A new cutting technology on the rotating part of the interior helical surface of screw pump stator is proposed aiming at the tough condition in manufacturing metallic screw pump stator. An equation on the parameters of interior helical surface is constructed in three segments. The contact equations of three helical surfaces were constructed based on the contact condition of the rotary surface of cutting tools and on the helical surface of work piece. This way, three contact paths were confirmed and external profile of cutting tools was calculated. The geometrical shape of cutting tools was confirmed by calculating, fitting and substituting the errors. Calculated results indicated that this method is feasible, laying a theoretical foundation for the cutting process of the interior helical surface of the metallic screw pump stator.
Structure Analysis of Electron Gun Deflection Coil Based on ProE and ANSYS
Authors: Liu Hai Lang , Zhang Rui Bin , Huang Yi Ping
Published: February 2011

Through the example of the electron gun deflection coil, this paper implements the structure modeling with ProE and makes the finite element analysis with ANSYS .The structure analysis is performed by the combination of the advantages of two softwares. The reasonableness of the design is verified. This method helps to optimize the structural design of the coil. The production of precision of the coil was improved, and coil size can effectively control and reduce material waste.
Modeling and Solving Product Configuration Problems Using Petri Net
Authors: Yang Dong
Published: February 2011

This Product configuration is a key enabling technology for implementing mass customization production. In this paper, we present an approach for modeling product configuration problems using Petri Net, a well-defined formalism for describing complex discrete systems. In the presented approach, components within a configurable product are modeled as places of PN whereas structural relationships between components are represented as transitions of PN. Configuration rules such as inclusion and exclusion rules are also described through the elements of PN. By modeling product configuration as a PN, a configuration solution is a set of transitions leading from the initial state of PN to a final state of PN. Therefore, the configuration problem can be solved by analyzing corresponding PN representation.
Research on the Development of High-Quality Hemp Fiber
Authors: Ji Ying Chao , Jiang Feng Qin
Published: February 2011

Different varieties of hemp (Canabis sativa L.) are cultivated in many regions in China for the production of hemp plant fiber. The objective of this study was to evaluate differences in the growth cycle, yield, quality of fiber and spinnability among the different varieties. We analyzed and compared the yield, fiber percentage, chemical components, breaking strength and spinnability, which determines fiber combing yield and fineness, of different hemp fiber from eight C. sativa varieties (Longjiang 1#, USO-14, Yun-hemp 1#, Shandong hemp, Qingshui hemp, Ningxia 6757, Ningxia 6762, and USO-31). We analyzed the data with a gray near-optimized method to select the variety of hemp that gave the best quality of fiber and was, therefore, the most suitable for cultivation in Heilongjiang Province. The results identified Longjiang 1# as the most suitable variety, USO-14 is the next best, and Yun-hemp 1# as the least suitable.
Variant Design Method of Assembly Consisting of Different Types of Parts
Authors: Xu Xin Sheng , Li Dan , Sun Meng Li
Published: February 2011

Variant design has been recognized as an effective measure to implement mass customization. Assembly consists of different types of parts. Its variant design is a profound issue need to be explored. Three aspects were discussed in this paper, namely, 1) part classification and dimension constraint satisfaction priority, 2) part reuse, 3) dimension conflict and variant postponing. Firstly, dimension constraint network among parts was constructed based on graph. And variant dimension transferring was exploited. Secondly, reusable part can be found from existing parts through similarity analysis. Thirdly, aiming at dimension constraint conflicts, variant postponing was proposed to concentrate variant design to few parts so as to reduce the number of variant part.
An Approach to Multi-Constrained 3D Modeling for Curtain Wall System Based on Spatial Point-Line Model
Authors: Hu Zhen Zhong , Yu Fang Qiang , Li Guo Xing , Wang Zhong Li
Published: February 2011

The accurate spatial 3D models and corresponding coordinates of every key point are needed to determine the sizes, shapes, and locations of installation for all curtain wall elements in the process of production and construction. To solve the transition problems between architectural design and construction design of curtain wall system, four kinds of single-constrained computer-aided 3D modeling algorithm for spatial point-line models were discussed in detail. Then, a multi-constrained iterative 3D modeling process was proposed by considering coupling relationships amongst the various constraints. A 3D modeling system named T3-CW-CAD was developed and applied to the Shenzhen Airport Terminal 3. The application results showed that the presented-algorithm can meet the overall demand for automatically generating multi-layer 3D models according to spatial point-line model, along with sizes and other restraints amongst curtain wall elements, therefore playing a key role in guiding the production and construction of curtain wall system.
A Multi-Objective Leverage Planning Method for Flexible Platform Using Quantitative Indices
Authors: Li Zhong Kai , Jiang Xiao Hong , Jiao Qing
Published: February 2011

The modular and scalable leverage planning for flexible platform is crucial for derivative product design. A multi-objective flexible platform leverage planning method with quantitative indices is proposed. Including customer requirement analysis and product attributes - components mapping, a platform planning process model is presented. The importance rate of product attributes and levels utilities of customer satisfaction are achieved with conjoint analysis. Quality function deployment is applied to acquire the co-relational matrix between attributes and components. Then the quantitative platform diversity index and commonality index are proposed to construct a two-objective leverage model and calculated by evolutionary algorithms to get Pareto optimal design solutions. The effectiveness of the proposed method is illustrated by the leverage planning for large-scale hydraulic support platform.
A Diehole Arranging Optimization Strategy in Multi-Hole Die Design for Profile Product Extrusion
Authors: Zhang Jin Biao , Wang Jing Wen , Duan Zong Yin
Published: February 2011

More and more attention is being paid to extrusion with multi-hole die in the manufacturing industry because of its advantages of high efficiency, high accuracy. However, there is a key factor that need to be taken into cosideration, such as diehole lacation on the multi-hole die. A optimization strategy integrated regression analysis for the multi-hole die design in profile extrusion process based on finite element simulation, GA, and regression theory was proposed, and an optimized model is established to predict the best location of diehole. A few examples show that the strategy is effective, feasible, and the model is accurate, applicable.
Nonlinear Method for Load Transfer Model of Super-Long Pile in Layered Soil
Authors: Chen Shang Ping , Yao Wen Juan , Zhu Sheng Qing
Published: February 2011

In this paper, a three-stage softening load transfer model, based on existing experimental data of super-long piles, is proposed; the hyperbola load transfer model is adopted to simulate the nonlinear deformation of pile-tip soil; and the elastic-plastic model of concrete is introduced, giving consideration to the super-long pile shaft deformation under heavy axial loads. Then the models above are implemented into pile-soil load transfer differential equation, and after being solved by iteration method, the nonlinear method for load transfer model of super-long pile in layered soil is established. After that programming of the model calculation is worked out. By comparison with engineering instance, it is shown that the method proposed in this paper is convenient and reliable in engineering practice.
Adaptive Fuzzy Control for Ink Key of Offset Printing Machine
Authors: Kang Jian Shan , Chu Hong Yan , Cai Li Gang
Published: February 2011

This paper analyzes the defect of some methods for controlling the ink key of offset printing machine, and presents the advantage of adaptive fuzzy control. Aiming at the problem that the processing curve of offset printing is changed by the environmental impact of production, this paper analyzes this non-real-time measurement and control system with time delay and less test data, and proposes the method of adaptive fuzzy control to amend the control table and adjust the slope of the control curve according to the detection deviations. Finally, the control rules are adjusted to meet the actual situation. By simulating the control arithmetic with the example of the control of printing ink keys under specific conditions using Matlab / Simulink, it is proved to be effective to achieve the expectative effect.
A Calculation Method for Compliance Uncertainty of GPS Standard-Chain
Authors: Wang Jin Xing , Jiang Xiang Qian , Wang Pan
Published: February 2011

The improved GPS (Geometrical Product Specification) system uses uncertainty as an economic tool to enable optimum allocation of resource amongst specification, manufacturing and verification. For a given GPS standard-chain, the key question is to calculate the compliance uncertainty. The determination of compliance uncertainty is a complex question because specification uncertainty and measurement uncertainty arise from many causes and propagate through the GPS standard-chain. A calculation method for compliance uncertainty of GPS standard-chain is proposed in this article. According to ISO 17450–2, a GPS process should be either in default state or special state. The biggest difference between the two states is that whether the specification operator is accordant with the verification operator. Aiming at the two states, the flow for the computation of compliance uncertainty is given respectively, and a case study is applied in default state. Results show it enables to generate compliance uncertainty on the verification of a GPS standard-chain, which makes the acceptance or refusal of GPS characteristic can be conducted in a quantitative way, so the veracity of verification could be improved.
Simulation and Analysis of Natural Ventilation of Residential Building's Arrangement
Authors: Tao Feng , Li Juan
Published: February 2011

Natural ventilation of residential buildings not only affects the comfort of people` s outdoor areas, but also has an influence on the pressure distribution in front of or behind a single building. Based on the natural climatic conditions in Hefei, the most common three arrangements are referred in this paper, and their ventilation will be simulated and analyzed by the computer. The advantages and disadvantages of different arrangements will also be compared.
Study on the Continuous Casting Production of 823 Steel
Authors: Du Cheng Wu , Li Li Ying , Wu Di , Wang Hai Bin , Liang Qi Hua
Published: February 2011

For producing high-value-added 823 shells steel used in military products ship, 50t electric arc furnace (EAF)-ladle furnace (LF)-continuous casting (CC) process was used in the test production. The results show that it is feasible to product the qualified 823 shells steel by controlling the final carbon and aluminum content, final deoxidization nitrogen fixation without titanium, controlling the superheat of the liquid steel in the tundish, spray water rate of mould, viscosity of mould powder and protection casting during the CC process.