Table of Content

10 October 2017, Volume 28 Issue 19

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Analysis on Hydraulic Parameters of Interconnected Suspensions Based on Fuzzy Grey Correlation

ZHOU Bing;CHEN Yibin;GENG Yuan;REN Chengyuan

2017, 28(19):  2269-2274. 

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In view of  the effects of hydraulic parameters of interconnected suspensions on the suspension responses, a four DOF hydraulically interconnected suspension half car roll frequency domain model was established. According to the system transfer function and road inputs the bounce acceleration power spectrum density and roll acceleration power spectrum density were calculated. By using the sensitivity analysis method based on fuzzy grey correlation, the influence degree of hydraulic parameter on bounce response and roll response was carried out. NSGA-Ⅱ method was used by taking as optimization object under two modes suspension responses. The obtained results indicate that the peak value of acceleration power spectral density is decreased as well as the acceleration root mean square value of the acceleration, and the ride comfort of the hydraulic interconnected suspension is improved.

A Kind of Intelligent Interactive Method for Automotive Customization

HUA Ertian1,2;SUN Qizong2;LIU Xiaojian3;ZHONG Jiaji2;CHEN Chuan2

2017, 28(19):  2275-2281. 

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Aiming at the problems that the absence of taking the considerations of the effective interactivity and that of the research on the acquisition and transformation for consumers' implicit demands in traditional automotive customization services, acquisitions and transformation for implicit demands were conducted, statements and analyses for customization characteristics were researched; and the mapping model between product characteristics and customer requirements was established, a method of intelligent interaction was proposed, which was based on organizational semiotics，then this method was optimized by golden section method. In final, the proposed method was tested by using the example of the customization in automotive colors. The results indicate that the method may improve interaction and the guidance of customization service in some ways.

Research on Driving Performances of Urethra Valve Driven by SMA Based on Wireless Power Supply

ZHANG Ran1;LI Xiao1;CAO Rui1;GUAN Ting2

2017, 28(19):  2282-2288,2299. 

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In order to solve the problems of severe urinary incontinence caused by urethral sphincter injuries or dysfunctions, a urethral valve driven by SMA spring was designed based on magnetic coupled resonant wireless power supply. The driving force model of the valve spool and the coupling model of wireless power transfer were established. The influences of the spring structure parameters on the driving forces were simulated and analyzed. The effects of the control parameters and the structure parameters of the wireless power supply system on the driving performances of the urethral valve, and the opening and closing performances of the urethra valve were studied experimentally. The results show that the principles of urethral valve are feasible, increasing the spring wire diameter, reducing the spring pitch diameter and the number of spring turns, increasing the signal source voltages, the coil wire diameters, the coil diameters and the numbers of coil turns and setting the reasonable frequency of the signal sources may improve the driving performances, and the opening and closing performances of the urethra valve are good. The research may provide the basis for the structural design of the urethral valve, and also provide the reference for the design of autonomous control system for other human sphincters.

A Novel Not-fully Symmetrical 3T1R PM with Low Coupling-degrees and Its Kinematics

SHEN Huiping;SHAO Guowei;DENG Jiaming;MENG Qingmei;YANG Tingli

2017, 28(19):  2289-2299. 

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By using topological structure synthesis theory and method based on POC equation，a novel 4-DOF 3T1R not-fully-symmetrical PM 2-RPaRSS with low coupling degrees was presented.Firstly，the coupling degree of the PM was calculated(κ=1).The modeling method and the numerical solutions for forward position kinematics of the PM were established based on ordered single-open-chain (SOC) units. Then the correctness of the forward solutions was verified by the inverse solutions and a numerical example. Furthermore，the total shape and size as well as Z-section shape of the workspace of the PM were analyzed. Further，the singularity of the PM was also analyzed，and three kinds of singular conditions were obtained. Lastly，the 3D model for the prototype of the manipulator was designed. This work shows that 2-RPaRSS manipulator is simple in structure and the workspace and the rotation ability of moving platform of the PM is larger than that of H4, I4R and Cross-Ⅳ.

Automobile Headlamp Contour Design Based on Cubic Quasi-Bézier Methods

LIU Zhi;HE Jiawen;CHEN Xiaoyan;JIANG Wan

2017, 28(19):  2300-2305. 

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In order to more effectively design the shapes of automobile headlamps, a car headlight contour design method was presented herein based on cubic quasi-Bézier curves with shape parameters. Firstly,the smooth connection conditions of piecewise cubic quasi-Bézier curve were studied. Then the car headlight contour curves were constructed using cubic quasi-Bézier spline curves. Besides,the adjustment methods of the contour curve shapes were proposed including the shapes of contour edges and corners. Finally,lights headlight contour model was obtained according to the orthographic projection curves. The contour curves might be flexibly adjusted by changing the values of shape parameters and the positions of control points. Compared with the conventional method,the curve used in this method has a lower degree and the calculation is easier. Numerical examples show that the method proposed herein is simple,effective and ease to complete interaction designs of shapes.

Geometrical Error Modeling and Sensitivity Analysis of a Neutron Spectrometer Sample Table

LI Yang1,2,3;WU Yunxin1,2,3;GONG Hai1,2,3;LIU Lei1,2,3

2017, 28(19):  2305-2310. 

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The structure of a spectrometer sample table testing residual stress by neutron diffraction and positioning measurement method were introduced herein based on standard probe. The positioning error model was established based on the standard probe positioning measurement scheme by using the multi-body kinematics and homogeneous transformation matrix. Finally, position error sensitivity analysis for 42 error components of the model was carried out. The results of the analysis provide a reference for precision design of the spectrometer sample tables testing residual stress by neutron diffraction.

Influences of Wheel Wear on Dynamics Performance of Vehicles Based on Archard Model

YAO Yongming;LI Guofang;DING Wangcai

2017, 28(19):  2311-2317,2324. 

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To study the effects of wheel wear on high-speed train dynamics performance, a multi-body system dynamics and vehicle wear wheel coupling model was established. The vehicles were considered through a typical line conditions consisting of straight lines and curves. Non-elliptic model was used to calculate the amounts of wear on the wheels, the amounts of wear of the wheel profile cumulations and then the profile shapes were updated. Using Archard wear model, wheel tread wear depth of 0.1mm was considered for profile update conditions, and then the next calculation cycle wear began. Finally, wear wheel profiles were loaded to study the effects of wear on the dynamics performance of the vehicle systems through the curves.

Research on a Parallel Type Semi-active Suspension Actuator

KOU Farong;LIANG Jin;WEI Dongdong;WANG Xing;TIAN Lei

2017, 28(19):  2318-2324. 

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A parallel type ball screw semi-active suspension actuator was proposed. A mathematical model of the actuator was established. The damping characteristics and energy recovery characteristics simulations of the parallel type semi-active suspension actuator were completed by using the MATLAB/Simulink, and the feasibility of the actuator was verified. The results show that, actuator damping force is as 0~1200N; the energy recovery voltage is as 0~6V,energy recovery power is as 0~80W,energy recovery efficiency is from 41.61% to 48.72% under low frequency vibrations. The actuator is trial-produced on the basis of parameter optimization. The actuator response is fine. The energy recovery characteristic tests of actuator were completed.

Research on Surface Quality of Heated Cutting Bearing Rings

XU Lanying1;WU Qiang2;QIN Mengyang1;TANG Yong3

2017, 28(19):  2325-2331. 

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In view of hard turning processes of bearings, the processing surface morphology of the outer rings of the bearings was obtained after the ordinary hard cutting and the pre-heating hard machining. Experimental results show that heated hard turning will help to reduce the roughness of the machined surface when the inner rings of workpieces are pre-heated to 160℃, due to the inner ring's heatings reduce the temperature difference between inner and outer rings of the bearings, the surface residual stress decreases significantly, its value is up to -50MPa, the processed surface textures are smooth and neat, tracks of tool feed motion are clear; there are no obvious changes in the surface hardnesses of the workpieces obtained separately by heated cutting and ordinary cutting. The heated cutting method obtains a uniform saw tooth shaped chip, and the chip shape is in a spiral shape, which shows that the heated cutting processes of bearing rings are relatively stable., it is beneficial to the formation of smooth surface, which may be used to improve the performance of the bearing rings.

Research on Radial Forces for Hydraulic Slide Valves Caused by Bernoulli Effect

LU Qianqian1,2;RUAN Jian1;LI Sheng1

2017, 28(19):  2332-2338. 

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To analyze the radial pressure distributions and influence factors of hydraulic slide valves, a visualized model of valve internal fluids was established by CFD software Fluent. The calculations show the distribution has close relationships with the sizes of notch, flows of entrance, aspects ratio of groove cut and the angles of input and output oil passages. The larger the size of notch is the larger fluctuate of radial pressure will be. The larger the flow of entrance is the smaller aspect ratio of groove cut and the larger fluctuate will be. The distribution become more stable under the 180° angle of input and output oil passages rather than the situation of 0° and 90° at x=0 section. Meanwhile, the circumferential pressure functions and distribution of inlet middle section and axial pressure functions were established by segmentation according to Bernoulli effect to verify the reliability of the simulation model and results. Finally, the influencing factors and distribution of clamping forces caused by the unbalances of radial pressures and radial steady-state fluid forces were analyzed.

Force Analysis of the Movable Teeth Transmission Integrated with SMAs

CHAI Zongxing;XU Lizhong

2017, 28(19):  2339-2345,2382. 

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In order to study the force laws of a movable teeth transmission integrated with SMAs, using direct current heating method and one-dimensional constitutive model of Brinson ,the driving equations of the SMA in the transmission were derived. Through the force analysis of the movable gear transmission, the coupling force equations of the transmission were established. The force curves of the movable tooth with the output shaft angles were plotted when the device parameters were changed,and the output curves were plotted under different input currents. The influences of the parameters on the force in the the movable tooth and the output curve under the input current were obtained.The results provide a theoretical basis for the further optimization and dynamics of the system, and provide the basis for the prototype manufactures and tests.

Assembly Data Modeling and Organization Based on SSPD and Polychromatic Sets

LI Lianhui1,2;SUN Hongxia1;LI Hongmei1;ZHANG Qinwei1;GAO Yang1;LEI Ting1;YUAN Ying2

2017, 28(19):  2346-2353. 

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To solve the problems of dispersed data sources, serious redundant and template changing errors during aero-engine assembly, a task-driven assembly bill of materiel(BOM) was established based on SSPD, and a four-layer data management framework of “draft-template-instance-serialized instance” and public information pool were given; then, depending on the demands for role data organization, an assembly data organization network model was built with polychromatic sets theory to mathematical description, and the flow of assembly data organization was given. An enterprise application proves the efficiency of this method to reduce data redundancy and improve the effectiveness of data organization.

Influences of Bending Radius on Delamination of Flexible Electronic Devices

TANG Pengpeng1;WEN Wen1;HUANG Yongan2;LIU Qian1

2017, 28(19):  2354-2359. 

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A mathematical model for calculating the ERR of flexible electronic devices under conformal bending was established with Bernoulli-Euler beam theory. Expressions were given to describe the relationship between the bending radius and the energy release rate. For comparison, the ERR was also computed using the VCCT. Influences of bending radius on the delamination of flexible electronic devices were then uncovered.The results of the paper are of great reference value to the flexible electronics manufacturing and applications.

Modeling for Assembly Error Propagations and Assessments of Assembly Precision Reliability

SU Chun;HUANG Yi

2017, 28(19):  2359-2364. 

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The modeling of assembly errors and the precision reliability assessments for rigid parts was investigated. The part errors were divided into position errors and orientation errors, and described with part error vectors. Considering the differences between dimensional errors and geometrical errors, the assembly errors were classified into internal errors of parts and joint surface errors. The concepts of active joint surfaces and passive joint surfaces were proposed. The composition of the errors and their calculation methods were proposed according to typical types of joint surfaces. An assembly error model was developed through the approach of pose transformation matrix, after that the assembly error accumulations and propagations were analyzed, and the assembly errors were calculated. The probability distributions of assembly errors were determined on the basis of statistical analyses. The concept of precision reliability was proposed, and simulation approach was adopted to calculate the reliability, which provides basis for the evaluation of assembly precisions. Case study of a measuring platform was provided, the assembly errors and precision reliability were obtained, the effectiveness of the proposed models were verified.

Multi Objective Optimization of Milling Process Parameters for Green High-performance Manufacturing

DENG Zhaohui1,2;FU Yahui1,2;WAN Linlin1,2;ZHANG Hua1,2

2017, 28(19):  2365-2372. 

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In order to realize CNC machine green high-performance manufacturing, a multi-objective optimization model with the highest energy efficiency, the lowest carbon emissions and the highest material removal rate was established by considering the actual constraint conditions of tool life and surface quality. The face centered composite experiment was designed to obtain experimental data and the signal to noise ratio methods were used to convert the different requirements of the optimization objectives into the same signal to noise ratio, the grey correlation analysis method based on combined weights was used to transform the multi-objective optimization into a single objective optimization problem. The second order relation model of the relational degree and processing parameters was established based on response surface method, the optimization model was solved by quantum genetic algorithm. The effectiveness of the proposed method was verified by experiments.

Regenerative Braking Control Strategy Based on Rate of Loading for Electric Buses

ZHAO Guozhu;SUN Qiongqiong;TANG Jingyou;LI Liang

2017, 28(19):  2372-2377. 

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To improve the regenerative braking energy recovery efficient of electric city buses, a novel braking force distribution control strategy for electric buses was proposed based on real load in view of the characteristics of electric buses that daily transport load changes significantly. The optimized mathematical model of the braking system was established. Firstly, optimized braking force distribution coefficients under the circumstances of full-load and no load were acquired by adopting the genetic algorithm. Then braking force distributions were controlled based on the optimized braking force distribution coefficients. New control strategy was added in ADVISOR2002 to verify the effectiveness of the control strategy. The simulation results reveal that compared with the primary control strategy where braking force distribution coefficients were invariable, the proposed strategy may improve the recovery of regenerative braking energy significantly on the premise of economic commission of Europe(ECE) braking regulations.

Effects of Alternating Magnetic Field on Microstructures and Mechanics Properties of High Hardness Cladding Layers

FU Yuming;QI Tong;ZONG Lei;ZHENG Lijuan

2017, 28(19):  2378-2382. 

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In order to improve the mechanics properties of high hardness lasers cladding layers, in the laser cladding processes, a class of sinusoidal alternating magnetic field was applied. The high hardness alloy cladding layers were prepared on the Q235A surface. The tensile tests, the impact tests, the fracture analyses, the microstructure observations, the phase analyses, the micro hardness tests and the comparative analyses of wear resistance of the test specimens were carried out. The effects of alternating magnetic field on the mechanics properties and microstructures of the cladding layers were studied. Research results show that in the laser cladding processes, the loading intensity is as 50mT and the frequency is as 20Hz, the tensile strength of the sample may be increased by about 9%, extension rate is increased by about 1%, impact toughness increased by about 11%, and the tensile fracture surfaces are obviously tough, material organizations are more detailed and dense; The microhardness of the cladding layers increase with the increase of the magnetic induction strength,but the changes of magnetic field frequency are very small. When the alternating frequency is as 25Hz, the magnetic field amplitude is as 60mT, the loss weight of the mill is reduced by 15%.

Mechanics Experiments for 22MnB5 Steel Solder-joints

WANG Xiaoguang1;YU Huiping2;LI Xiaoyang2;CHEN Shujun2

2017, 28(19):  2383-2387. 

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For quenching steel of 22MnB5 spot welding structure was analyzed in test. Ultra-high strength steel elastic modulus，Poisson's ratio， the mechanics properties of solder joints surrounding and hardness，metallographic observation analysis were obtained through tensile test with the strain gauge measurements. The reasons for damage of the structure by spot welding were obtained by the optical microscope analyses of solder joints of fracture appearance, and the super-high strength steel solder structure consisted of the plastic ring， resistance spot welding and the base three parts preliminarily. The mechanics changes of solder joints are complex，far end forced may first damage failure， and shows the stress direction of the plastic ring is of
smallest hardness，the connecting part produces negative bending moment after stretching，this bending may make the welding produces a small rotation angle.

Study on Shaping Parameter Control of Lead Screw Cold Roll-Beating

LI Yuxi1;LI Yan1;CUI Limu1;YANG Mingshun1;XIAO Jiming1;CUI Fengkui2

2017, 28(19):  2388-2393. 

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A FEM model of the lead screw cold roll-beating forming processes was built, the ABAQUS software was used to simulate the forming processes. Firstly, based on simulation results, the orthogonal test was designed, influences of processing parameters on forces, beating depths and bulging heights of cold roll-beating processes were studied. Then multivariate regression models of beating depth and bulging height to process parameters were established, and significance tests for regression effects were carried out. Finally, with the self-developed experimental device, lead screw cold roll-beating experiments were carried out to verify the effectiveness of the models, which is of important guiding significances for forming accurate profiles of lead screw by control processing parameters.