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Wang D.,Jilin University | Jiang R.,Jilin University | Liu H.,Jiangsu Xuzhou Engineering Machinery Institute | Xu C.,Jiangsu Xuzhou Engineering Machinery Institute
Qiche Gongcheng/Automotive Engineering | Year: 2015

For studying the effect of front wheel shimmy caused by unbalanced wheel on the ride comfort of dump truck, firstly a mathematical model for steered wheel shimmy of vehicle with dependent suspension and a multi-body dynamics model for a heavy dump truck with consideration of front wheel unbalance are established with their correctness verified by real vehicle tests. Then on thess bases, simulations on vehicle ride comfort under both balanced and unbalanced states of front wheel are performed with the models built. Finally, the effects of wheel unbalance on front wheel shimmy and ride comfort of dump truck are studied with the limiting value of wheel unbalance for the ride comfort of dump truck is determined to be 10 kg·cm. The study provides a technical basis for the control of front wheel unbalance in the whole process of manufacture, operation and maintenance of dump truck. ©, 2015, SAE-China. All right reserved.

Jiang R.,Jilin University | Wang D.,Jilin University | Lu W.,Jilin University | Liu H.,Jiangsu Xuzhou Engineering Machinery Institute | Xu C.,Jiangsu Xuzhou Engineering Machinery Institute
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2015

In order to improve the ride comfort of a domestic self-dumping truck, a virtual prototype vehicle model was built through multi-body dynamics software Adams. And vehicle road test of ride comfort was implemented to verify the validity of this model. Taking the suspension stiffness and damp parameters of cab suspension as design variables, the root mean square (RMS) values of floor's vertical and seat's pitching weighted acceleration as optimization objectives, and the deflection of front and rear cab suspension as constraints, the Kriging approximation models were constructed based on optimal Latin hypercube design. On this basis, multi-objective optimization for self-dumping truck ride comfort was performed with particle swarm optimization algorithm, and the Pareto optimal set was obtained. Furthermore, a vehicle road test of ride comfort was conducted by using one of the optimal solutions. The results indicated that the Kriging approximation model with high fitting accuracy could significantly improve the efficiency of ride comfort optimization of self-dumping truck according to different weighting schemes of optimization objectives. The road test results showed that the overall weighted acceleration RMS values on the cab floor of the improved self-dumping truck were greatly reduced with a maximal reduction of 16.5%. ©, 2015, Chinese Society of Agricultural Machinery. All right reserved.

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