空气弹簧系统阻尼试验研究

Study on Air Spring System Damping Test

为研究空气弹簧阻尼试验的准确性和可操作性,首先阐述了自由衰减法、基础激振法和半功率带宽法等进行阻尼试验的理论,然后分别对空气弹簧系统的阻尼试验进行了试验研究,并对比了不同试验方法阻尼结果的差异性和准确性。研究表明,空气弹簧阻尼的3种试验方法都有一定的可操作性,但自由衰减法受气囊结构材质特性的影响较难得到理想的衰减波形;半功率带宽法受试验频率分辨率和提取半功率点的影响很大,试验结果往往有一定的误差;采用基础激振法,能取得较真实的空气弹簧阻尼特性,但在高频区域位移传递函数理论曲线和试验曲线的符合性比较差。研究结论可为空气弹簧系统的阻尼试验提供一定的参考指导。

In order to explore the accuracy and maneuverability of air spring damping test, the damping experiments theory of free vibration, foundation excitation and half power bandwidth were described, then the air spring damping was studied experimentally and the difference and accuracy of damping results of different test methods were compared. The results showed that the three test methods of air spring damping were operable. The ideal attenuation waveform was difficult to be obtained by the free vibration method because of the influence of the material and structure characteristic of air bag;Half power bandwidth method was greatly affected by test frequency resolution and the extraction of the half power point, there was often a little error in the test results;The foundation excitation method could obtain the real damping characteristic of air spring, but the theory and test curve of displacement transmissibility in the high frequency region were poor compliance. The research provided a reference for air spring damping test.