动力传动系统扭转振动的分析及控制

摘要

随着国内汽车企业对车辆质量要求的升级，噪声振动的控制技术备受重视，来自系统设计相关的噪声振动需要靠实车测试及计算机模拟的配合来解决。动力传动系统的扭转共振就是一个这样的噪声振动问题，利用系统化步骤解决这个问题的优点是它适用于各种类型的车辆，仿真模拟是解决这个问题的核心技术。首先根据发动机到车桥整个动力系各单元部件的转动惯量、扭转刚度及阻尼来建振动力学模型，然后分析系统的自然频率、模态及频响，进行数模的开发过程与测试对比，这种方法对车辆性能优化问题非常有效。%Vehicle NVH control has gained increasing attention of domestic auto makers in an effort to promote vehicle’s quality. To solve the problem, the integrated product testing and simulation modeling are necessary. One example of system NVH problem that can be benefited by this approach is the powertrain torsional vibration. The key technology in this approach is the development of an effective simulation model. First of all, dynamic parameters such as the torsional stiffness, moment of inertia and torsional damping of individual parts are measured or calculated. Then, these parameters are used to simulate the powertrain torsional vibration for its natural frequencies, mode shapes and frequency responses. With this method, the vehicle’s performance can be optimized easily.