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Accuracy Analysis and design of A3 Parallel Spindle Head

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Chinese Journal of Mechanical Engineering 2016年第2期29卷 239-249页

作者： NI Yanbing ZHANG Biao SUN Yupeng ZHANG Yuan School of Mechanical Engineering Tianjin University Tianjin 300072 China China faw Group Corporation r&d center Changchun 130000 China

As functional components of machine tools, parallel mechanisms are widely used in high efficiency machining of aviation components, and accuracy is one of the critical technical indexes. Lots of researchers have focused on the accuracy problem of parallel mechanisms, but in terms of controlling the errors and improving the accuracy in the stage of design and manufacturing, further efforts are required. Aiming at the accuracy design of a 3-dOF parallel spindle head（A3 head）, its error model, sensitivity analysis and tolerance allocation are investigated. Based on the inverse kinematic analysis, the error model of A3 head is established by using the first-order perturbation theory and vector chain method. According to the mapping property of motion and constraint Jacobian matrix, the compensatable and uncompensatable error sources which affect the accuracy in the end-effector are separated. Furthermore, sensitivity analysis is performed on the uncompensatable error sources. The sensitivity probabilistic model is established and the global sensitivity index is proposed to analyze the influence of the uncompensatable error sources on the accuracy in the end-effector of the mechanism. The results show that orientation error sources have bigger effect on the accuracy in the end-effector. Based upon the sensitivity analysis results, the tolerance design is converted into the issue of nonlinearly constrained optimization with the manufacturing cost minimum being the optimization objective. By utilizing the genetic algorithm, the allocation of the tolerances on each component is finally determined. According to the tolerance allocation results, the tolerance ranges of ten kinds of geometric error sources are obtained. These research achievements can provide fundamental guidelines for component manufacturing and assembly of this kind of parallel mechanisms.

关键词： A3 head error model sensitivity analysis tolerance allocation

Experimental study on durability fracture behavior and vibration modal sweep for vehicle rear axle

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Journal of Beijing Institute of Technology 2013年第2期22卷 207-212页

作者：门玉琢于海波霍娜 School of Mechatronics Engineering Changchun Institute of Technology China faw Company Limited r&d center

In order to study the fatigue fracture behavior of the rear axle of certain China-made car, the strain loading spectrum near the rear axle fracture location is collected, the modified Neuber rule and the cyclic stress-strain hysteresis loop curve equation are used to convert the nominal strain his- tory into the local stress-strain response. The impact of mean stress on fatigue damage is corrected according to the Manson-Coffin model, and programming calculation of the fatigue damage of the fracture crack is conducted in the INFIELd software, the electromagnetic vibrators are used to sweep the vibration modal frequencies of the rear axle and car body. The enhancement test and fre- quency sweep results show that the rear axle fatigue damage mainly concentrates on the washboard road, and when the forced vibration excitation frequency is 24. 07 Hz, the vibration modal frequency of the rear axle is close to the excitation frequency of the washboard road, leading to resonance and making the rear axle subjected to large strain and fatigue damage, and then vibration fatigue fracture due to high stress concentration.

关键词： fatigue damage durability fracture vibration sweep loading spectrum forced vibra- tion

Coach Simplified Structure Modeling and Optimization Study Based on the PBM Method

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Chinese Journal of Mechanical Engineering 2016年第5期29卷 1010-1018页

作者： ZHANG Miaoli rEN Jindong YIN Ying dU Jian State Key Lab of Automotive Simulation and Control Jilin University Hyundai Motor Technology & Engineering center (China) Ltd. r&d center FAW Group

For the coach industry, rapid modeling and efficient optimization methods are desirable for structure modeling and optimization based on simplified structures, especially for use early in the concept phase and with capabilities of accurately expressing the mechanical properties of structure and with flexible section forms. However, the present dimension-based methods cannot easily meet these requirements. To achieve these goals, the property-based modeling （PBM） beam modeling method is studied based on the PBM theory and in conjunction with the characteristics of coach structure of taking beam as the main component. For a beam component of concrete length, its mechanical characteristics are primarily affected by the section properties. Four section parameters are adopted to describe the mechanical properties of a beam, including the section area, the principal moments of inertia about the two principal axles, and the torsion constant of the section. Based on the equivalent stiffness strategy, expressions for the above section parameters are derived, and the PBM beam element is implemented in HyperMesh software. A case is realized using this method, in which the structure of a passenger coach is simplified. The model precision is validated by comparing the basic performance of the total structure with that of the original structure, including the bending and torsion stiffness and the first-order bending and torsional modal frequencies. Sensitivity analysis is conducted to choose design variables. The optimal Latin hypercube experiment design is adopted to sample the test points, and polynomial response surfaces are used to fit these points. To improve the bending and torsion stiffness and the first-order torsional frequency and taking the allowable maximum stresses of the braking and left turning conditions as constraints, the multi-objective optimization of the structure is conducted using the NSGA-II genetic algorithm on the ISIGHT platform. The result of the Paret

关键词： coach structure property-based modeling (PBM) simplification modeling multi-objective optimization

Vibration Isolation Performance research of Commercial Truck’s Cab Suspension System Based on road Load data

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Vibration Isolation Performance Research of Commercial Truck...

2014中国汽车工程学会年会

作者： Yan Xin Jiang di Wang Zhongxiao Guo Maolin China faw Group Corporation r＆d center

ISBN: (纸本)9783662450420

Based on road load data of commercial truck’s cab suspension system,extreme value and standard deviation of acceleration signals are statistically *** then pseudo-damage analysis is done to get the damage attenuation level of the shock *** to the theory of shock absorber vibration isolation,amplitude frequency response characteristics of the cab suspension system are *** of the study is to find a way to evaluate the performance of commercial truck’s cab suspension *** is very useful to guide the forward design of cab suspension system from the perspective of passenger comfort and component fatigue life so that it can provide data support and improvement suggestions for the development of commercial truck cab suspension system.

关键词： road load data pseudo-damage vibration isolation performance

damage risk Evaluation and Optimization for BIWS Spots-weld 1

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2016中国汽车工程学会年会暨展览会

作者： deng daolin Zhang Yu Xu Zhonghao China faw Co. R＆D Center

ISBN: (数字)9789811035272

ISBN: (纸本)9789811035265;9789811098963

Aspots damage risk evaluation method was proposed based on the spots axial and shears *** spots damage risk index for a SUV BIW was calculated and evaluated,and the BIWs spots were *** evaluation results show that most of the positions with high risk spots are the same with the damaged spots of the road or bench *** spots damage problem was solved by optimizing the spots based on risk *** method can achieve the spots damage risk evaluation and optimization efficiently.

关键词： axial force shear force risk index evaluation optimization

The Study of Friction and Wear Capability of Piston ring Coatings

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The Study of Friction and Wear Capability of Piston Ring Coa...

2016中国汽车工程学会年会暨展览会

作者： Li Wenping Lu Yun China faw Corporation Limited r＆d center

ISBN: (纸本)9789811035272;9789811035265

The friction and wear capabilities of four coatings piston ring which Chromium,PVd,PCVd and GdC were studied with simulated *** results indicate that GdC coating shows the minimum wear rate and the lowest friction coefficient,while the Chromium coating shows the worst friction and wear *** wear rate of GdC ring is only 15 percent of Chromium ring.

关键词： piston ring coatings friction and wear

Simulation and Validation of Engine Valvetrains System dynamics

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Simulation and Validation of Engine Valvetrains System Dynam...

2014中国汽车工程学会年会

作者： Niu Wenbo Tang Lechao Jiang Wenhu Li Tiancheng Chine faw Group Corporation r&d center State Key Laboratory of Comprehensive Technology on Automobile Vibration and Noise & Safety Control Chine faw Group Corporation r&d center

ISBN: (纸本)9783662450420

The dynamic behavior of the valvetrains for a gasoline engine is simulated by using a multi- valvetrain dynamic model,of which the stiff parameters are caculated by finite element ***,the simulation results of camshaft torques and valve forces are validated by experiments,and the calculated data are consistent with the test *** on the correct model,the sensitivities of dynamic loads influencing NVH of the engine directly are analysed,and the primary influencing factors of the fluctuation of camshaft force,torque and spring force have been found,and further dynamic force optimization direction for NVH performance of valve train have been pointed out.

关键词： valve trains dynamic analysis dynamic force NVH

Study on Calibration of Secondary Air Injection System in a V12 Engine 1

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2016中国汽车工程学会年会暨展览会

作者： Zhao Hongzhi Wang Wei Zhong Xiaofan CHINA faw Co. Ltd R＆D Center

ISBN: (数字)9789811035272

ISBN: (纸本)9789811035265;9789811098963

The emission regulation of CHINA 6 is going to be issued,the limits of the emissions will be greatly *** utilization of secondary air injection system is proved to be one of the effective methods to reduce the CO and THC emissions in the phase of cold *** application of secondary air system in the process of the V12 engine developing,the control strategy,the result of calibrationand the diagnostic calibration are introduced,according to the development ***’ s a reference to the engineers who face the similar issue.

关键词： secondary air injection calibration emission

direct Injection Start-stop Piston Final Stop Position Modelling and Analysis

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Direct Injection Start-stop Piston Final Stop Position Model...

2016中国汽车工程学会年会暨展览会

作者： Zhou Peng Li Jin Zhang Jianrui Yu Weifei Si Qingtao Yu Tuozhou China faw Group Co. R&D Center Engine Department

ISBN: (纸本)9789811035272;9789811035265

When it comes to GdI ’ start- stop’ technology,the control of final stop crank angle can never be *** probability distribution of this final angle could be obtained via repetitious engine stop experimental method,the principle of which however,could *** a result it seems impossible to get a concise control on the engine stop *** model ’ engine stop’ has been established,simplified and modified in order to identify the key factors that have an effect on engine *** model was verified by related experiment to address the simulation *** analysis on simulation results provide us several essential conclusions that the factors,specifically heat transfer and leakage as well as the initial speed in compression top dead center of final stroke,will cause a strongly different piston final *** engine final position will be relatively located in the range 0

关键词： piston final stop position modeling key factors