bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis Calculation on Single-Tooth Roll Mobile Crusher Mechanics Model
Authors: Cheng Xiang Wen , Xi Hong Tao
Published: September 2011

Using the second crushing theory and combining with the single-tooth rolling mobile crusher mechanism analysis, a single-tooth rolling mobile crusher mechanical model was established. Through analysis of force on the tooth roller, deduced calculation formulas of the teeth roll tangential force, the tangential force by an example calculation was more accurate.Through the analysis of the whole crushing process, the process can be divided into three kinds of condition to analysis of roller teeth force, the roller teeth mechanics model was established under this three kind condition.
Research on the Natural Frequency Prediction Method for Ring Tension Truss Deployable Antenna
Authors: He Xing Xing , Liao Ying , Yang Ya Jun
Published: September 2011

It is nearly impossible to carry out prototype experiments of large deployable space antennas because of their large dimensions. To solve this problem, a performance prediction approach is proposed in this paper. The prototype’s working performance is predicted by the scale model of the large deployable antenna. Based on this method, the natural frequency of the ring tension truss deployable antenna working in space is studied. The effect of the structural parameter distortion is taken into consideration by similarity criteria, and a similarity experimental formula of structural natural frequency is obtained. Four finite element models are established to validate the correction of the prediction method. The simulation results show that it’s valid for the prediction method to analyze the prototype in space, and it can be applied to promote the design, and performance prediction of the large deployable antennas.
Backstepping Fuzzy Sliding Mode Control for a Three-Links Spatial Robot Based on Variable Rate Reaching Law
Authors: Hu Sheng Bin , Lu Min Xun
Published: September 2011

To achieve the tracing control of a three-links spatial robot, a backstepping fuzzy sliding mode controller based on variable rate reaching law is proposed in this paper. The sliding mode controller is designed by means of backstepping way. To reduce the adjustment time, a fuzzy controller is designed to adjust the slope of sliding mode surface. To diminish the chattering of traditional sliding mode control, the variable rate reaching law is proposed. The variable rate reaching law is composed of the distance from current point to sliding mode surface in phase plane. The simulation studies for the tracking control of a three-links spatial robot have been carried out. Simulation results show the validity of the proposed control scheme.
Experimental Research of Grain Mass Flow Condition Monitoring System
Authors: Lv Zuo Chao , Qiu Bai Jing , Fang Yi Jun
Published: September 2011

Data acquisition in fields, especially yield data acquisition, is an important step in precision agriculture.To obtain the yield information, a grain mass flow condition monitoring system is developed. which consists of impulse-type grain mass flow sensor, grain mass flow condition monitor, CPR transmitter and power supply component. The grain mass flow condition monitor collects data from grain mass flow sensor;displays and stores them after processing. On the basis of test rig experiments with wheat, wheat field experiments are finished in June 2010 .The experimental results show that the accuracy of this monitor syterm is within 3% in test rig experiments and within 5% in field experiments while the grain flow rate is 0~ 2 .5kg / s, which met the precision agriculture production accuracy.
Study of the Integrated Configuration of a Parallel Machine with Joint Rings
Authors: Xie H. , Cai Wen , Li Shang
Published: September 2011

This paper aims at exploring a new parallel machine as a configuration integration, and developing this new configuration into a series. The moving platform of this parallel machine (spindle) replaces the swivel ball joints with joint rings. In the machine processing, the rigidity of the spindle parts can be enhanced. The layer of joint rings will increase holding points of spindle components and reduce singularity of the parallel machine. The comprehensive method of machine will be used in this paper which is based on the azimuthal characteristic. Each chain of the machine will be splitted into a single opened chain for research, analyzing the azimuthal characteristic of each kinematic pair. A union method is also used to work out the motion output equation of each chain. Different chain combination and intersection method will be applied on the basis of the verification of a 5-strut parallel machine to build the parallel machine of four degrees of freedom with joint rings.
Numerical Analysis of Static Characteristics of Herringbone Grooved Hydrodynamic Journal Bearing
Authors: Zhu Han Ting , Ding Qian
Published: September 2011

By means of the finite differential method, the Reynolds equation is solved and the static characteristics of herringbone grooved hydrodynamic journal bearing are numerically analyzed by presenting the circumferential and axial pressures. The influences of parameters such as the eccentricity, width-diameter ratio of bearing, spiral angle, depth and number of grooves, on the static characteristics of herringbone grooved bearing are discussed. The results indicate that the normal pressure of oil film and the load carrying capacity as well, of herringbone grooved bearing will decrease with the increase of groove number and depth. On the other hand, as the pressure distributes in wider area in the circumferential direction, the stability of bearing can be improved. In consideration of these two aspects, the optimal groove number is 8-12, and the selection of depth and screw angle of grooves should also be chosen carefully to obtain the significant performance of herringbone grooved bearing.
A New Cylinder Profile of Double-Action Sliding Vane Compressor and its Three Dimensional Model Based on SolidWorks
Authors: Lu Chun Hui
Published: September 2011

Profile is the most important base in double-action compressor design. Different cylinder profile decides different working chamber volume in double-action sliding vane compressor. Five equations of cylinder profile were researched by calculating the working chamber volumes and a new cylinder profile equation of double-action sliding vane compressor was composed to get larger chamber. In same condition with the other equations, the working chamber volume of new profile is bigger than the old profiles over 20 percent while it has no change in the moving and friction characters. And a three dimensional model based on SolidWorks of a new profile was done. Finally, it was assembled successfully in computer to check the design.
Development and Application of CNC Turning Macro-Program Based on Non-Circular Curve
Authors: Yue Qiu Qin , Yu Hua
Published: September 2011

Owing to the deficiency of machining non-circular curve by manual programming in CNC system, the universal macro-program of machining non-circular curve based on the ellipse curve in CNC turning of the FANUC system is developed by adopting analytical and inductive approach. The real application of machining ellipse and parabola curves are also proposed in this paper, which showed that the universal macro-program is flexible and convenient. The programming efficiency and quality is increased effectively while machining any other non-circular curve works.
Thermal Post-Buckling of Heated Cross-Ply Laminated Composite Beams
Authors: Chang Xue Ping , Liu Jun , Ren Ji Hong
Published: September 2011

Abstract: On the basis of Reddy’s higher order shear deformation plate theory and the von Kármán’s geometry nonlinear theory, governing equations for nonlinear thermal buckling and post-buckling of cross-ply laminated composite beam subjected to a temperature rise are derived, in which the stretching-bending coupling terms produced by the non-homogenous distribution of the material properties are included. By using the shooting method to solve the corresponding nonlinear boundary value problem, numerical solutions for thermal post-buckling of cross-ply shear deformation laminated composite beam with its both ends immovably simply supported under uniform temperature rise are obtained. As an example, equilibrium paths and configurations for laminated composite beam paved in term of 0/90/0 are presented and characteristic curves of the nonlinear deformation changing with the thermal load were plotted. The effects of the geometric and physical parameters on the deformation of the beam are also examined. The theoretical analysis and numerical results show that different thermal expansion coefficient ratio, elastic moduli ratio, shear stiffness ratio will influence of the non-dimension critical buckling temperature.
Experimental Studies on Application of Digital Image Correlation in Modal Parameter Identification
Authors: Dong E Liang , Wang Wei Hui , Zhang Wei
Published: September 2011

The accurate identification of modal parameters is the core content in the experiment modal analysis of structure. The effective and accurate collection of vibration dates comes to be as the premise of high precise identification. This paper presents a new method of data collection in modal parameter identification. By high-speed camera, time series images of vibration were obtained; Then, the images collected were processed using digital image correlation method, and the time-displacement graphic on vibration direction of some pixels selected was got; Finally ,the time-domain signal was post-processed based on the complex Morlet wavelet transform, and the modal parameters were got. By a specific experiment, the method was proved feasible and effective.
Modeling and Dynamic Analysis of Cantilever Beam Coupled with Moving Mass
Authors: Zhao Xing Wei , Hu Zhen Dong
Published: September 2011

A system of cantilever beam coupled with moving mass is investigated in this paper. Based on the time varying feature of multibody system, a dynamic model of the mass moving along the cantilever beam is established. The time varying motion equation including time varying mass and stiffness is derived by using the generalized Hamiltion’s principle, which results to a partial differential equation with variable coefficients. The nonlinearity of the equation is featured by those variable coefficients. To deal with the nonlinearity, methods of assumed modal shapes, Runge-Kutta are occupied. Then, a time varying system of a cantilever beam with stepwise sections coupled with a moving mass is given as an example. Numerical solutions of the dynamic responses of the system are achieved and certain analyses are made in the form of graphs.
Pressure Waves Propagation in an Elastic Shell with Polydisperse Liquid-Gas Mixture
Authors: Levitsky Semyon , Bergman Rudolf , Haddad Jehuda
Published: September 2011

The target of the paper is modeling of the influence of small amount of free gas on pressure wave propagation in a cylindrical elastic shell, filled with viscous liquid. Heterogeneity of the bubble population and the basic sources of wave attenuation (wall friction, heat exchange between gas in microbubbles and surrounding liquid, viscous and acoustic losses) are taken into account. The dispersion equation for the waveguide is studied numerically and effect of the bubble size distribution on the longitudinal wave propagation is discussed.
Research on the Structure System Mode Match of a Remote Control Weapon Station
Authors: Mao Bao Quan , Wang Chuan You , Xu Li , Wu Yong Liang , Zhang Xue Xin
Published: September 2011

A certain type of Remote Control Weapon Station is a complex structural system. The main reason of affecting the firing accuracy of weapons of the RCWS is the structural vibration. If there are several components with the similar natural frequency, they will influence each other and there is a possibility of resonance. For the poor firing accuracy of the Remote Control Weapon Station, the mode simulation and mode match analysis is done with the application of the complex structural system mode match analysis theory and by using the advanced finite element analysis software -Workbench, to get the conclusion that the kickstand design which is used to stabilify the weapon barrel need to be improved. That can provide theoretical guidance and technical support for the remote weapon station firing accuracy and stability improvement.
Reliability Analysis on Shear Capacity of Reinforced Masonry Wall Due to Earthquake
Authors: Xiao Liang Li , Wang Xiao Tao , Li Yue , Bulleit William M.
Published: September 2011

A probabilistic model is used to assess the structural reliability of typical reinforced concrete masonry walls under combined shear and compression. Factors such as model error, shear strength of concrete masonry, wall aspect ratio, horizontal and vertical reinforcement ratios, structural safety class, axial load-to-dead ratio, height and thickness radio of the wall, and load effect combination will be considered. Based on a relatively large number of test results and theoretical analysis from the literature, the limit state equation for shear bearing capacity was established. A sensitivity analysis will be performed to identify the key contributors to the reliability of the masonry walls under the combination of gravity and earthquake. The results will provide a base to evaluate whether consistent safety is achieved for masonry walls that are subjected to different load combinations. The counteracting load factors in current design codes for masonry structure will be investigated.
Finite Element Simulation on Failure of Elbow Impacted by Flat-Nosed Missile
Authors: Yu Jian Liang , Yan Xing Qing , Chen Ling
Published: September 2011

Finite element model of the elbow interiorly impacted by flat-nosed missile was established using ANSYS/LS-DYNA. The Cowper-Symonds model was adopted. The rupture strain failure criterion was used to define the failure process. Numerical values were compared with experimental values obtained from the literature and the reliability of model was validated. The penetration failure mode of the elbow was analyzed. Factors of the critical rupture kinetic energy Er were acquired. It can be seen that the penetration failure mode is plugging induced by the extrusion and scraping dominated of axis stress. The effect of Do on Er can be neglected. Er increases with the increase of t/Do, Dm/t and R/Do when the missile mass m is invariable. The effect of m on Er should consider the factors of m and critical rupture velocity Vr.
Oscillation Response of Museum Cultural Relics under Earthquake by Shaking Table Tests
Authors: Zhou Qian , Yan Wei Ming
Published: September 2011

To protect movable cultural relics,by shaking table tests oscillation responses of museum free-standing cultural relics under earthquakes were studied.Based on actual sizes of a museum showcase,a 1:1 scale model was built whose bottom was fixed on the shaking table.A bronze cultural relic was put in the showcase by free-standing mode.By white noise excitation frequency distributions of the showcase were obtained;By inputting 3 different types of earthquake waves (El-centro wave,Taft wave and Artificial wave of ΙΙ site classification) with different intensities (0.1g,0.2g and 0.4g of peak ground accelerations) ,seismic responses of both showcase and relic were studied, their damage types were discussed, displacement as well as acceleration response curves of typical positions were analysed as well.Results show that prominent frequency ingredients of the showcase are between 30-40Hz,which are far from those of input earthquake waves,thus the showcase is not damaged seriously;while for the relic when input earthquake intensity is low,its main damage symptom is oscillation;when earthquake intensity increases,the oscillation response becomes very serious and the relic is prone to overturn and get destroyed.
Analysis of Failure Modes and Mechanism of Subgrade under Earthquakes and Recommendations for Improving Seismic Design
Authors: Su Qian , Huang Jun Jie , Li Shi Yu , Hu Hui Xing
Published: September 2011

To study the seismic failure effect of subgrade, the field investigation and analysis of seismic failure of the subgrade are conducted. six seismic failure modes of the subgrade are proposed, (1) shallow surface sliding of slope, (2) development of slip surface within the body of subgrade, (3) development of slip surface reaching the foundation, (4) overall sliding of sloping subgrade, (5) slumping, and (6) desification. Meanwhile, the investigation shows that seismic subsidence rate and wave-like deformation amplitude rise with the increase of seismic intensity, the degree of subgrade damage is closely related to the characteristics of route selection. The research has analyzed the seismic damage mechanism of the subgrade, explores a new concept of seismic design based on allowable deformation proposed by Ikuo Towhata.
Study on Seismic Response Characteristics of Double Cables Suspension Bridge
Authors: Ding Nan Hong , Lin Li Xia , Qian Yong Jiu , Huang Lei
Published: September 2011

Damping in double Cables suspension bridge composed of steel reinforcement beams and reinforced concrete tower is non-classical, which leads to coupled equations of motion in main coordinate system. Based on the complex damping theory, the viscous damping ratio is solved, which can be used to describe energy dissipation characteristics of non-classical damping system approximately. Seismic response of double chains suspension bridge is analyzed through an example of double chains suspension bridge, considering the geometric nonlinearity and non-classical damping. And numerical calculation is presented for seismic response subjected to independent effect or combination effect of three orthogonal components of seismic wave. Single cable suspension bridge can be taken as a special case of double cable suspension bridge, after the main cable shape coefficient is introduced. The dynamic responses of double cable suspension bridge and single cable suspension bridge are compared to reveal the characteristics of Seismic Response of double cable suspension bridge. The study of the dynamic responses characteristics of double cable suspension bridge has a positive significance on structural form selection of such type bridge during designing, dynamic performance evaluation and reinforcement design has positive significance.
Earthquake Response Analysis of Sliding Base Isolation Frame with Equipment of Sliding-Limit under Collision Responses
Authors: Xiong Zhong Ming , Wei Ming Xing , Wang Jun Liang
Published: September 2011

In order to get over the defects of traditional sliding base isolation structure which the reactions of traditional sliding structure has always increased during the earthquake, and obtain sliding base isolation technology application for the frame structure. Based on the research of U work performances of energy-absorbed element, the whole element model of this new kind of sliding base isolation three storey frame structure with equipment of sliding-limit was established by the SAP2000 software. According to reasonable hysteretic mode, the calculation analysis under collision responses were carried out. The calculation results showed that the rigidity of the new sliding-limit had a great influence on changes of the storey acceleration and displacement after collision. The maximum base sliding displacement of both earthquakes loading was obviously bigger than that of a single earthquake loading. With the other direction loading earthquake increasing, the maximum base sliding displacement of the structure showed signs of increasing first, and then decreasing. Effective theoretical basis of sliding base isolation technology being applied to the frame structure were provided.
Stability and Bifurcation of a Continuum Rotor with Transverse Electromagnetic and Bearing Excitations
Authors: Luo Hai Yang , Wang Yue Fang
Published: September 2011

This paper presents the stability and bifurcation of a continuum rotor with transverse electromagnetic and bearing excitations. The rotor system is modeled as continuous beam which is excited by uniformly distributed electromagnetic force and two oil-film forces. Using the Galerkin’s method, the partial differential equation of nonlinear motion is discretized as second order ordinary differential equations. The harmonic balance method is used to determine the approximate periodic solution, then the Floquet multipliers are obtained and the stability of periodic solution can be judged. The Andronov-Hopf bifurcation is presented when the leading Floquet multiplier continually changing with rotation speed passes the unit circle on the complex plane. Bifurcation diagrams of displacement with varying rotation speed are obtained using the Runge-Kutta method. Periodic motion and quasi-periodic motions appear alternately with the rotation speed showing inherent interaction between electromagnetic force and oil-film forces.
The Simulation of the Steady Dynamic of Trailing Antenna on an Aircraft
Authors: Zheng Xiao Hong , Hou Zhi Qiang , Han Wei , Jia Zhong Hu
Published: September 2011

To send the very low frequency signals, the length of antenna must attend one-half of a wavelength, maybe more than 8,000 meters sometimes. And the projection of the antenna on plumb line must exceed seventy percent of the antenna’s whole length. So the dynamic character and control of trailing antenna on a aircraft is one of most inmportant problems which need to research. The steady dynamic is the base of the dynamic character and control. The mathematics model of the trailing antenna is founded,and sloved via a shooting technique. The inflences of the angle of bank and the velocity of aircraft to the the end radius and verticality are reached. The result shows:under the low drag,for certain ranges of the angle of bank and the velocity ,the equilibruim solution is multivalued.
The Test Study of Bus Engine Mounting Device Dynamic Behavior in Engine’s Idling Status
Authors: Zhang Wei Feng , Zhang Xin Gang , Fan Chuan Shuai , Liu Wei , Chen Jun Jie
Published: September 2011

To investigate the main vibration source which caused the serious vibration in passenger ride area of one type bus under its engine’s idling status, the effect of isolated vibration and energy transfer characteristics of the engine mounting block are tested and analyzed by modern signal processing technology in this paper. By the measurement of the acceleration response signals of engine’s exciting points and the fixed points of engine’s mounting on its chassis, the transfer function of engine’s mounting block under engine’s idling status was obtained. The calculation and analyzed results draw a conclusion that: the stiffness of the engine’s front mounting is too hard, and the vibration of the engine in idling status was amplified obviously. And then the harshness of the studied bus could be improved according to this conclusion.
Rigid Contact Model of Ultrasonic Motor Based on Finite Element Method
Authors: Jiang Chun Rong , Jin Long , Hu Min Qiang , Wang Rui Xia
Published: September 2011

Rigid contact model of rotor/stator in ring type traveling wave ultrasonic motor without frictional material based on finite element method is proposed in this paper. First, the vibration of the stator is analyzed. Next, the rigid contact model is simulated by finite element method. Subsequently, the contact mechanism of the rotor/stator as well as performance of the ultrasonic motor is studied, and the performance of motors with two different kinds of rotor is compared. It is indicated that contact length of the rotor/stator along circumferential direction decreases from the outer to the inner edge and the stall torque increases and no-load speed decreases with preload force increasing. The result is identified as being useful in designing and analyzing the ultrasonic motor.
Dynamic Simulation and Experimental Analysis on Ride Comfort Performance of Tracked Vehicle
Authors: Wang Wen Rui , Chen Han , Du Sai , Yang Bo
Published: September 2011

A comprehensive nonlinear vehicle model of a tracked vehicle suspension is established by using multi-body dynamics software Recurdyn, which is used to be simulated ride comfort dynamic response. In the paper, the multi-body model dynamics vibration characters of vehicle suspension is simulated, which is accomplished by testing the model on the different roads (such as level-D,E&F Road) by different vehicle riding speed. The influence factors about ride comfort are found by the stimulation, which are the road level,the velocity of the vehicle and other parameters of the suspension system. The experiment about the vehicle ride comfort performance proves that using the multi-body model simulation in the paper could be helpful to select appropriate suspension system parameters in the structure and performance design about tracked vehicle suspension, which could give theory bases about suspension active controlling strategy of the suspension.
Regression Analysis of Dynamic Parameters Based on Experimental Data of a New Seismic Isolation Layer
Authors: Yao Fei , Liu Ke , Shang Shou Ping
Published: September 2011

A new steel-asphalt composite seismic isolation layer is introduced briefly. Based on data of shake table tests, regression analysis by least squares method is adopted to analyze the natural frequency and the damping ratio of a new isolation layer. The calculation results show that the damping increases as the input acceleration increases because when PGA is relatively large, the lateral displacement of the isolation layer is large, the distance between the upper beam and the lower beam become smaller. The upper beam squeezes the asphalt ointment between it and brick piers. Part of the vertical load begins to transfer to the brick piers and friction occurs between brick piers and upper beam.. It is good for displacement limit of the structure.
Research on Steering Dynamic Characteristics of Tracked Vehicle Transmission System
Authors: Li Pei Xin , Zhou Xiao Jun , Wei Yan Ding , Tang Fang
Published: September 2011

Based on the operating characteristics of tracked vehicle transmission system, the dynamic characteristics and research methods for transmission system were summarized. According to the analysis of above, a new test rig which can simulate the steering process of tracked vehicle was proposed, and the methods for driving and loading system were determined, the test procedures and evaluation system for the tracked vehicle transmission system were summed up. It provides a practical test method for the design and development of tracked vehicle transmission system.
Study on the LQG Control of Acceleration/Braking System Based on Wheelbase Preview
Authors: Pan Gong Yu , Huang Yu
Published: September 2011

A dynamic model of semi-vehicle under acceleration/braking condition based on air suspension was established. By applying wheelbase preview control to forecast the road surface roughness at the front wheel, the optimal controller based on wheelbase preview control theory was designed. Then the dynamic model was simulating with the MATLAB. The results show that both optimal control and optimal control with wheelbase preview can effectively reduce vibration of acceleration/braking system, which make an improvement in the vehicle’s ride comfort and handing stability. Finally, a controller based on wheelbase preview of air active suspension acceleration/braking system was designed, and then simulation was analyzed with white noise input. Centric acceleration, pitch angular acceleration and rear tire dynamic load of the back section were reduced significantly proving pre-wheelbase control can further improve the performance of the vehicle potentially, especially having an effect on decreasing the vibration of rear suppression.
Computation of Aerial Towed Cable Aerodynamic Performances with Large Eddy Simulation
Authors: Han Wei , Kang Xiao Wei , Wang Yun Liang , Zheng Xiao Hong
Published: September 2011

The dynamics characteristic of aerial towed cable has been investigated with many models. Because of the coupling between the components of the towed cable system, the dynamics of the towed cable is complex and nonlinear. Though the aerodynamic performances of cable is studied for a long time, the results are quiet different with researchers. The ideal method to obtain the aerodynamic forces is to simulate the flow structure around the towed cable.The purposes of this paper are to simulate the flow field of the towed cable with the different inclined angles by using Large Eddy Simulation (LES) with sub-grid scale model of Smagorinsky-Lily and to study the variation of the aerodynamic forces and its influences on flow structure. The results show that the LES can predict the flow structure of the cable reasonably.
Analytical Study on Wind-Induced Vibration and its Control of Transmission Towers in Mountainous Area
Authors: Sheng Zheng Yi , Xia Chun , Xu Wei Ping , Li Peng Yun
Published: September 2011

A method for analyzing wind-induced vibration and its control of transmission tower-line system in mountainous area is described. The method is applied to a real transmission line containing two self-supporting steel angle towers, 3 spans of conductors and ground lines together with insulators. Analyses are conducted for the out-of-plane wind direction, and the fluctuating wind load on tower-line system is simulated by harmony superposition method and davenport spectrum. The numerical results indicate that the wind-induced response and its control effect are mainly related to the stiffness of the towers, rather than the mounting height or the spans of the power lines. At the same time, viscoelastic dampers fixed on the main members can suppress the wind-induced displacement of the towers effectively.
The Research of Semi-Active Fuzzy Control on Sweep Frequency Vibration of Geophysical Prospecting Car
Authors: Liu Mi , Yang Guo An , Zhao Yong Lin
Published: September 2011

The vibration system of a geophysical prospecting car has three main features: the starting frequency is low (from 1Hz); the load is large (a single spring bears more than 3667Kg of load); the vibration signal is mixed with stochastic components. In this paper, models of an improved passive vibration isolation system and a semi-active fuzzy vibration control system of a geophysical prospecting car frame are established and simulated respectively. In the semi-active fuzzy control system the stiffness of an air spring is adjusted, and at the same time the impact by damping changes on the system performance is also taken into account. In order to evaluate the effects, the displacement and acceleration of car frame and the dynamic load of air spring are taken to comparative analysis. The results indicate that the proposed semi-active scheme can effectively lower the damage from vibroseis to the body of the car.
Numerical Method of Evaluating Noise from Vibrating Tyre
Authors: Chang Liang
Published: September 2011

About tyre vibration sound issues, domestic and foreign scholars have conducted a lot of researches. Existing research results show that: the road texture and tyre tread have a significant effect on the tyre/road noise. Since the road surface texture and tyre tread pattern have impact on the tyre noise, whether the coupling relationship of road surface texture and tyre tread pattern has influence on noise? In this paper, from coupling viewpoint of road surface texture and tyre tread pattern, road surface texture and tread pattern of geometric morphology were calculated by digital gray level images fractal dimension and discretized into finite element model, then the vertical contact force within contact surface of tyre and pavement, which is exciting force in tyre vibration model, last numerical calculation of evaluating noise from vibrating tyre was completed by tyres vibration model and basic principle of boundary element method for calculating sound field.
Research on Damage Alarming Method of Structures Based on Information Statistics in Frequency Domain
Authors: Song Yan Sheng , Sun Zong Guang , Hai Hong
Published: September 2011

This paper demonstrates the feasibility of a new structural damage alarming method based on statistics. The abnormal index was introduced to analyze the benchmark structure in frequency domain. The results show the abnormal index defined in sense of statistics indicates the abnormity of corresponding test cases clearly.
Study and Application of China’s Freeze-Thaw Action Spectrums for Life-Cycle Structure Design
Authors: Lin Chi , Ou Jin Ping
Published: September 2011

To get environmental action information for structural life-cycle design and durability design, the air temperature of most Chinese cities from 1951 to 2009 was employed to analyze the applicability of half normal distribution in expressing freeze-thaw action spectrums. A use of spectrum to predict concrete life under freeze-thaw action was performed as well after compiling the freeze-thaw action spectrum of Harbin. In this paper, weather data such as Beijing, Hohhot, Yining and Zhengzhou were analyzed and results showed that half normal distribution is available for most areas of China. Meanwhile, to account for the effect of freezing temperature, freeze-thaw life of a common concrete in water-saturated state in Harbin was predicted to be only about 6 years based on quantitative analysis of the concrete frost resistance.
Analysis of Harbin’s Freeze-Thaw Action for Life-Cycle Structure Design
Authors: Lin Chi , Ou Jin Ping
Published: September 2011

To get environmental action information for structural life cycle design and durability design, the air temperature of Harbin (China) from 1963 to 2002 was employed to analyze the probability distribution of freeze-thaw action herein. The influence of freezing temperature on concrete freeze-thaw damage was taken into account. We analyzed the temperature data of Harbin with an condition of freeze-thaw cycle that the daily maximum temperature higher than 0°C and the minimum temperature lower than -3°C, and the results showed that the freeze-thaw action could obey the half normal distribution well. In addition, applicability analysis of the half normal distribution for different freeze-thaw conditions was conducted as well, and the data can pass the distribution test with a significance level of 0.05.
Rubber Modified Asphalt Mixture Properties and Mechanical Testing
Authors: Zhang Rong Hui , Liu Jia , Huang Jian Chao , Fu Yi
Published: September 2011

To solve the high-temperature rutting problem of asphalt pavement, the old rubber of the tire rubber and plastic of general polyethylene waste composite modified asphalt mixture is proposed. The plastic and rubber compound particle was made by the rubber through efficient desulfurization additives, pre-swelling, twin-screw extrusion equipment. The particles mixed with the asphalt mixtures specimen preparation and the dynamic stability experiments, composite beam fatigue experiments, flexural tensile strength and modulus experiments and anti-reflective pavement cracks and other mechanical experiments are performed. The comparative data obtained by the rubber and plastic composited modified asphalt mixtures and SBS asphalt mixtures prove that the rubber and plastic composited modified asphalt mixtures have excellent rutting resistance and fatigue resistance.
Synthesis Experimental Study on the Supporting Capacity of the Strongly Weathered Diorite in Jinan Area
Authors: Shang Min , Xu Qiang , Xue Yi Guo
Published: September 2011

The strongly weathered rock zone is a special kind of rocks and soils mass. For its larger burial depth and low utilization of natural foundation, the physical and mechanical properties of the strongly weathered diorite were grasped poorly. In the article, the normal investigation together with test in-situ has been applied in the project. The physical and mechanical properties of the strongly weathered diorite were analyzed deeply by the methods of field exploration, laboratory test and testing in-situ. It is feasible for the intensively weathered diorite to serve as natural foundation after lucubrate research and the evaluation of bearing capacity and settlement deformation in the project of the office building of China Industrial and Commercial Bank, Shandong Branch..It is proved from practice that the item of foundation treatment saved about two million Yuan compared with the pile foundation. Moreover it speeded up the process of the construction enormously, lessened the difficulty of the construction and obtained tremendous economic and social benefits.
Analysis on System Reliability of Steel Framework Structure and Optimal Design
Authors: He Jia Nian , Wang Zhan
Published: September 2011

In order to hurdle the limitations of Monte Carlo method and Response Surface method, the advanced Monte Carlo method was shown in this paper. And the system reliability of a one-bay and three-story steel framework structure was analyzed using the improved Monte Carlo method. Results of reliability analysis showed that there were high precision and a short calculating time using the improved Monte Carlo method. Then, the model of optimal design for steel frame based on the system reliability was built in accordance with the improved Monte Carlo method. And the optimal design on the steel frame was shown using the modern optimization method--genetic algorithm. From results, it was proved that optimal design without reliability could make structure have not enough reliability, even would not reach the required level of structural safety of Chinese criterions. It may lead to hidden dangers when only to reach objection on economy but haven’t considering reliability.
Study on the Effect of Supporting Stiffness on Energy Dissipation Efficiency of Viscous Dampers
Authors: Lu Yun Xiang , Cai Yuan Qi , Qu Qing Fei , Zhan Qian Hua
Published: September 2011

Viscous dampers are widely used in vibration energy dissipation project. The researches on viscous dampers used in energy dissipation project at present are more, and one of the main research contents is about how to improve energy dissipation efficiency. In the current study, the effect of the supporting stiffness in dampers is neglected, and only its strength and stiffness is verified. Based on the research on the principle and mechanical model of viscous damper, the influence of supporting stiffness on various energy dissipation working parameters has been analyzed in this paper. The results showed that, supporting stiffness has great influence on the energy dissipation efficiency, then with energy dissipation efficiency as the index, this paper derived the generality support stiffness design formula for energy consumption optimizing, which provide scientific basis for similar design.
Investigation of the Plane Model of Steel Staggered Truss System
Authors: Li Xiao Juan
Published: September 2011

Steel Staggered Truss System (SSTS) is a new structural system with flexible arrangement, superior performance and good economy. A plane model was established with SAP2000 and the feasibility of the plane model to study the dynamic characteristics of SSTS under horizontal earthquake was discussed through performing modal analysis and pushover analysis to the space model and the plane model of SSTS. By comparing the response of models, it showed that the plane model changed the mechanical characteristics of SSTS, and there existed errors using the plane model to research on the dynamic characteristics of SSTS under horizontal earthquake
Random Analysis of RC Structures during Construction
Authors: Zhao Jun , Jia Wei Wei
Published: September 2011

Since accidents of reinforced concrete structure occur frequently, it is a key issue to ensure the safety and stability of structures during construction. In this paper, each construction cycle was divided into four stages using discrete time method of freezing to establish the computational model. According to random theory, with the characteristics of reinforced concrete structures during construction, a series of recurrence equation is built by stochastic finite element method during construction. Based on a random analysis of practical engineering, the random response time-varying rule of reinforced concrete structure is obtained during construction. The results show that the construction process of reinforced concrete structure could be simulated well based on perturbation stochastic finite element method .Both the mean and standard deviation of deflection of mid-span could be obtained precisely.
A Pseudo-Space Model of Steel Staggered Truss System
Authors: Li Xiao Juan
Published: September 2011

A pseudo-space model as a new model of Steel Staggered Truss System was proposed to assess the transverse seismic performance of the structure. Modal analysis and pushover analysis were performed on the space model and the pseudo-space model of SSTS with SAP2000. Through comparing the results of models, it showed that the pseudo-space model reflected the lateral force characteristics of the original structure, and could simulate the stress mechanism of the structure under transverse seismic.
Design and Performance of the Double Dislocation Perforated Shielding Plate Used in Vacuum Arc Deposition for High Quality Coating Deposition
Authors: Lang Wen Chang
Published: September 2011

Based on the different movement characteristics of macro-particles, ions and electrons in the plasma transmission, this paper developed a simple, easy device with low cost-- double dislocation perforated shielding plate used in the coupling enhanced magnetic field, which can also satisfy the requirements of preparing high-quality films; This paper also studied the impact of double dislocation perforated shielding plate on the transmission of arc plasma and film properties. The results showed that: compared with the physical fielding plate, in the realization of the resistance to macro-particles transferred in straight line, part of the ions can also pass through the perforated position in the double dislocation perforated shielding plate to increase the ion density behind the fielding plate, thus increasing the film’s deposition rate to some extent. At the same time, the double dislocation perforated shielding plate can significantly reduce the roughness of the film and improve the film's finish, while the film structure does not change.
Study on Analysis and Estimation of Alert Degree Based on EEG
Authors: Li Shu Zhen , Jiang De Rong
Published: September 2011

Alert degree refers to human in perform the task duration time to maintain the level of attention or vigilance. At present, the EEG is the most common and most objective research alert degree physiological indexes. When the alert degree has change, the EEG signals recorded the pattern change accordingly. Therefore, through the records and analysis in the process of man on a mission of EEG signals can estimate alert degrees. This paper introduces the EEG and alert degree of the basic knowledge, the alert degree analysis based on an EEG with estimated the latest research methods, key technology and possible applications for reviewed in detail, and discusses several now needs to solve the problem.
Research and Design of Wireless Remote Health Monitoring System Based on nRF24E1
Authors: Jiang Yong Zeng , Yao Zhong Min , Song Guang Jun , Dong Jing
Published: September 2011

The application of wireless sensor network technology in the field of medical and health, especially in remote monitoring applications, has an important practical significance to our country entered old age. A design of wireless remote health monitoring system based on nRF24E1 was studied, completed the wireless sensor network node’s circuit of hardware , operating principle and design method of software. Through a simple application of the design, the resources of the hardware is saved, the complexity of the software is simplified . And the hardware of the system is simple, low power consumption and practical.
Development of a Novel CaP-Containing Mesoporous Silica-Based Xerogels Used as Hemostatic Material with Good Biodegradability and Low Heat Generation
Authors: Li Xiao Sheng , Lin Wei , Xin Feng Lan , Yuan Yuan , Liu Chang Sheng , Da Cheng Long
Published: September 2011

A novel Ca/P-containing mesoporous silica-based xerogels (CaMSX) with good degradability and low heat generation were synthesized for hemorrhage control by a modified sol-gel process and physicochemically characterized. The mesoporous silica-based xerogels without Ca/P (MSX) was also prepared as comparison. The in vitro whole blood coagulation time, activated partial thromboplastin time (APTT) and prothrombin time (PT) of the CaMSX were measured with MSX, Chinese traditional medicin-Yunnan medical powder (YM) and traditional zeolite. In vivo bleeding model was tested with rabbit’ ear side veins. The results illustrated that the CaMSX could remarkably promote the intrinsic and extrinsic blood coagulation processes which greatly depend on the dosage and the content of Ca in the CaMSX. The CaMSX had better efficiency in promoting coagulation process than that of MSX, YM and zeolite.
Adsorption and Catalysis of Orange II from Wastewater by Inorganic-Organic-Bentonite
Authors: Ma Jian Feng , Yu Jian Ming , Cui Bing Ying , Li Ding Long , Dai Juan
Published: September 2011

Inorganic-organic-bentonite was synthesized by modification of bentonite by Hydroxy-iron and surfactant, which could be applied in dye removal by adsorption and catalysis. The removal of acid dye Orange II was studied at various factors such as time and pH of solution. The results showed that the inorganic-organic-bentonite could efficiently remove the dye with efficiency of 96.22%. The maximum adsorption capacity is 76 mg/g. The pH of solution has significant effect on both adsorption and catalysis. When pH was 4, the maximum removal efficiency of adsorption and catalysis were 97.57% and 87.23%, respectively. After degradation, the secondary pollution was diminished and the bentonite could be reused.
Effects of Isolated Soy Protein and Ascorbic Acid on Formation of Furan, Acetic and Formic Acids from Fructose
Authors: Huang Xue Song , Peng Ning
Published: September 2011

Effects of isolated soybean protein (ISP) and ascorbic acid on volatiles formed from fructose solution were investigated by selected ion flow tube-mass spectrometry (SIFT-MS). Model system were prepared by 5% fructose solution with pH 6 phosphate buffer and heated at 100°C for 2 h. The results show that fructose forms furan (114 PPB), ormic acid (59 PPB), and acetic acid (40 PPB) in the headspace of 500ml bottle containing 80 mL solution. 0.5% ascorbic solution also form furan, formic and acetic acid which are less than the yields of 5% fructose does. ISP stimulates the formation of furan from fructose. Fructose and ascorbic acid form formic and acetic compounds independently, but form the furan dependently. It could be concluded that the degradation mechanism is multiple and complicated for the formation of furan, formic and acetic acids from ISP, fructose and ascorbic acid, which need further researching.
A Preconditioned Gauss-Seidel Iterative Method for Linear Complementarity Problem in Intelligent Materials System
Authors: Duan Ban Xiang , Zeng Wen Ying , Zhu Xiao Ping
Published: September 2011

In this paper, the authors first set up new preconditioned Gauss-Seidel iterative method for solving the linear complementarity problem, whose preconditioned matrix is introduced. Then certain elementary operations row are performed on system matrix before applying the Gauss-Seidel iterative method. Moreover the sufficient conditions for guaranteeing the convergence of the new preconditioned Gauss-Seidel iterative method are presented. Lastly we report some computational results with the proposed method.