考虑鞍座弹性的三轴半挂汽车列车行驶平顺性建模及仿真分析*

将鞍座简化成弹性模型,基于一定假设,建立了三轴半挂汽车列车七自由度平面系统力学模型。采用拉格朗日方程推导了矩阵形式的三轴半挂汽车列车七自由度平面系统数学模型。基于隔离体静力平衡分析求解出车轮静载,给出了振动响应量的表示。基于前轮路面激励建立了等效的系统频率响应特性。以某三轴半挂汽车列车为研究对象,对其在B级路面50 km/h的工况下进行了仿真,得到了主要振动响应量的功率谱密度。对仿真结果进行了分析,为三轴半挂汽车列车行驶平顺性深入研究奠定了模型和理论基础。

Modeling and Simulation of Ride Comfort for Three-Axle Tractor-semitrailer Based on Elastic Saddle

The mechanical model of three-axle tractor-semitrailer with seven degree-of-freedom half automobile system is built based on the certain assumptions and elastic saddle. The mathematical model of three-axle tractor-semitrailer with seven degree-of-freedom half automobile system is derived in matrix expression using Lagrange equations. Wheel static load is solved based on the analysis of isolation static equilibrium, and the vibration response variables are given. The equivalent system frequency response is established based on the roadSexcitation of front wheel. Ride comfort of a three-axle tractor-semitrailer is simulated on the B-class road and at 50 km/h velocity, power spectral densities of main vibration response variables are obtained, and simulated results are analyzed. The research lays the theory and model foundation for the further study of ride comfort of three-axle tractor-semitrailer.