新标准下汽车平顺性虚拟道路试验系统与评价方法

Virtual Roadway Test System and Evaluation Method for Vehicle Ride Comfort Based on New Test Regulation

摘要:

基于CAN和TCP/IP总线搭建了包括座椅上方测点角速度信号测量的虚拟测试系统，基于LabVIEW设计了上位机程序，状态机构架保证了程序易读易维护，队列方式实现采样和数据处理并行执行提高了程序运行效率。整个系统具有集成度高、传感器体积小易于安装、易于功能扩展的特点。对国内外4个平顺性法规进行了对比分析，利用搭建的测试系统进行了系统实车试验。研究表明：测试系统工作稳定可靠；座椅上方角速度信号对评价指标的影响随车速的提高而增大，在车速达70 km/h时已接近20%（ISO标准），不应忽略；加速度功率谱密度函数的估计方法、原始信号采样频率等对评价指标影响大，相对而言，时域法比较稳定可靠，但确定符合频域频率加权的滤波器是难点。

关键词:汽车;平顺性;评价方法;测试系统;数据处理

Abstract:

A virtual test system used to measure angular velocity on the top of driver seat was constructed based on CAN and TCP/IP bus. The program running in PC was designed based on LabVIEW, of which the status machine structure ensured the program to be easily read and maintained, and the queue structure increased efficiency of program implementing data sampling and processing in parallel. The system had the characteristics of high degree of integration, small size of sensors, convenient installation and function expansion on the spot. Four ride comfort regulations at home and abroad were comparatively analyzed and the test system constructed was used and verified in road way tests. The influence of angular velocity on the top of driver seat on evaluation index increased with the vehicle velocity, and it neared 20% (ISO standard) when the vehicle velocity reached 70km/h so that it could not be ignored. Additionally, the estimation method of acceleration PSD (power spectral density) and sampling frequency of original signal had a major impact on the evaluation index. Relatively speaking, the time domain method was more stable and reliable. However, it was difficult to determine the filter accorded with frequency domain weighting.

Key words:Vehicle;Ride comfort;Evaluation method;Test system;Data processing