A system for modal testing and analysis of tire vibration characteristics in free suspension state are established with the use of vibration experiment and modal analysis methods. Through data processing and analysis of the radial tire excitation signal, some frequencies and the radial modals are extracted, and the variation of modal parameters of the tire with the inflation pressure changing is analyzed. This work provides guidance for the research of experimental methods, tire structure design and dynamic performance analysis of vehicles.%利用振动实验模态分析的方法,建立自由悬置状态下轮胎的振动特性模态测试与分析系统,通过轮胎径向激振测试信号的数据处理与分析,提取各阶的频率及其径向模态振型,分析轮胎的模态参数随充气压力变化的规律,为实验方法的研究和轮胎结构设计及车辆的动力性能分析提供指导.
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