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基于Matlab/Simulink建立平地机速度仿真模型,该模型包括动力传动系统、轮胎惯量、整机动态及负载等模块。通过牵引负荷车试验,获取某型平地机轮胎滑转率与驱动力之间的关系,并作为模型仿真的输入条件,仿真分析不同动态负载下轮胎附着性能对平地机速度平稳性的影响。结果表明,轮胎附着性能是影响平地机速度平稳性的重要因素;随着负载波动幅度的增大,平地机速度平稳性变差;随着负载波动频率的增加,平地机速度平稳性趋好。进一步研究表明,改进轮胎附着性能和采用全轮驱动能够有效提高平地机的速度平稳性。
Based on Matlab / Simulink, a simulation model of grader speed is established. The model includes powertrain, tire inertia, whole machine dynamics and load module. The relationship between the tire slip rate and the driving force of a grader was obtained by traction load car test and used as the input condition of the model simulation to simulate the influence of the tire adhesion performance on the grader speed stability under different dynamic loads. The results show that tire adhesion is an important factor that affects the speed stability of grader. As the load fluctuation increases, the speed stability of grader deteriorates. As the frequency of load fluctuation increases, the speed stability of grader becomes better. Further research shows that improving tire adhesion and using all-wheel drive can effectively improve the speed of the grader stationary.