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Jin A.,Huazhong University of Science and Technology | Zhang W.,Huazhong University of Science and Technology | Wang S.,Huazhong University of Science and Technology | Yang Y.,CandC Trucks Co. | Zhang Y.,Huazhong University of Science and Technology
SAE International Journal of Commercial Vehicles | Year: 2014

The suspension system of a heavy truck's driver seat plays an important role to reduce the vibrations transmitted to the seat occupant from the cab floor. Air-spring is widely used in the seat suspension system, for the reason that its spring rate is variable and it can make the seat suspension system keep constant 'tuned' frequency compared to the conventional coil spring. In this paper, vibration differential equation of air-spring system with auxiliary volume is derived, according to the theory of thermodynamic, hydrodynamics. The deformation-load static characteristic curves of air-spring is obtained, by using a numerical solution method. Then, the ADAMS model of the heavy truck's driver seat suspension system is built up, based on the structure of the seat and parameters of the air-spring and the shock-absorber. At last, the model is validated by comparing the simulation results and the test results, considering the seat acceleration PSD and RMS value. Copyright © 2014 SAE International. Source


Tang G.,Hefei University of Technology | Zhu H.,Huazhong University of Science and Technology | Zhang Y.,Huazhong University of Science and Technology | Sun Y.,CandC Trucks Co.
SAE Technical Papers | Year: 2015

The vehicle ride comfort behavior is closely associated with the vibration isolation system such as the primary suspension system, the engine mounting system, the cab suspension system and the seat suspension system. Air spring is widely used in the cab suspension system for its low vibration transmissibility, variable spring rate and inexpensive automatic leveling. The mathematical model of the air spring is presented. The amplitude and frequency dependency of the air spring's stiffness characteristic is highlighted. The air spring dynamic model is validated by comparing the results of the experiment and the simulation. The co-simulation method of ADAMS and AMESim is applied to integrate the air spring mathematical model into the cab multi-body dynamic model. The simulation and ride comfort test results under random excitation are compared. It shows that the co-simulation model of the cab air spring suspensions which considers the effects of the air spring dynamic stiffness characteristic has a good agreement with that in the test. Copyright © 2015 SAE International. Source


Tang Z.,Huazhong University of Science and Technology | Chen Y.,Huazhong University of Science and Technology | Zeng J.,CandC Trucks Co. | Yang Y.,CandC Trucks Co. | Zhang Y.,Huazhong University of Science and Technology
SAE International Journal of Commercial Vehicles | Year: 2014

NVH quality is one of the most important criteria by which people judge the design of a vehicle. The Powertrain Mounting System (PMS), which can reduce the vibration from engine to vehicle cab as well as the inside noise, has attained significant attention. Much research has been done on the isolation method for three- and four-point mounting. But the six-point mounting system, which is usually equipped in commercial vehicle, is seldom studied and should be paid more attention. In this paper, the support rod installed on the upside of the transmission case is considered as a flexible body. Thus a rigid-flexible coupling model of PMS is established and the necessity of the established model is analyzed by comparing the simulation results of the new model and those of the conventional model. Based on the traditional theory of energy decoupling and reasonable allocation of the natural frequencies, Adams and MATLAB are integrated into the optimization software iSIGHT to optimize the six-point PMS. The orthogonal experiment is used to determine the main factors that affect the optimization objective and the initial design parameters for further optimization. The Mixed Integer Sequential Quadratic Programming (MISQP) is used to obtain an optimal model of PMS. Finally the dynamic frequency response method is used to validate the optimal model. Copyright © 2014 SAE International. Source


Yang Y.,CandC Trucks Co. | Sun Y.,CandC Trucks Co. | Dong Z.,CandC Trucks Co. | Zhang Y.,CandC Trucks Co.
SAE Technical Papers | Year: 2016

To improve the vehicle NVH performance and reduce the vibration of the exhaust system, average driving DOF displacement (ADDOFD) and dynamic analysis are used to optimize hanger locations. Based on the finite element model and rigid-flexible coupling model, exhaust system analysis model was established. According to the finite element model of the exhaust system, the free-free modal analysis is carried out, and the position of the hanging point of the exhaust system is optimized by using the ADDOFD method. Furthermore, through the dynamics analysis, the force of each hanger to the body is calculated by the dynamic analysis, then verify the rationality of the hanging position. The combination of the two methods can effectively determine the better NVH performance of the exhaust system with hanger locations in the earlier vehicle development process. © Copyright 2016 SAE International. Source


Feng C.,CandC Trucks Co. | Dong Z.,CandC Trucks Co. | Yang Y.,CandC Trucks Co. | Xie C.,CandC Trucks Co. | Wang K.,CandC Trucks Co.
SAE Technical Papers | Year: 2015

The vibration theory and dynamic vibration absorber (DVA) theory is presented. Based on the finite element analysis and rigid-flexible coupling analysis, combined with an engineering example, drive shaft analysis model including DVA was established. The effects of DVA's parameters on the dynamic response of the main system, such as frequency ratio, mass ratio, installed position and damping ratio were studied independently as an experimental design. The studied conclusion was used to optimize DVA directionally, and optimization of multiple factors was completed. In this paper, the optimization design of a drive shaft with DVA was completed and a final test evaluation was implemented, that the rigid-flexible coupling analysis method was verified. Copyright © 2015 SAE International. Source

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