CAJ | 학술논문

为研究某城际车工作状态下模态贡献问题，首先用激振器对该城际车进行了静态台架实验，利用LMS. Test. Lab软件识别其模态参数。然后对该城际列车进行线路实验，测试其不同速度级下的加速度振动响应。根据ODS FRF概念，给出了城际车在ODS FRF包络曲线峰值处的工作变形。最后根据模态叠加原理，得出不同速度级下，该城际车不同频率下工作变形主要由车体沉浮、车体点头及车体1阶垂弯贡献的结论。同时结果显示，不同速度级下，同一频率下工作变形可能由不同固有模态贡献；不同速度级下，同一工作变形频率可能会发生偏移。
위연구모성제차공작상태하모태공헌문제，수선용격진기대해성제차진행료정태태가실험，이용LMS. Test. Lab연건식별기모태삼수。연후대해성제열차진행선로실험，측시기불동속도급하적가속도진동향응。근거ODS FRF개념，급출료성제차재ODS FRF포락곡선봉치처적공작변형。최후근거모태첩가원리，득출불동속도급하，해성제차불동빈솔하공작변형주요유차체침부、차체점두급차체1계수만공헌적결론。동시결과현시，불동속도급하，동일빈솔하공작변형가능유불동고유모태공헌；불동속도급하，동일공작변형빈솔가능회발생편이。
Modal contribution problem of intercity rails under working conditions is studied. First of all, the static exciter experiment is done for the intercity rail, and its modal parameters are identified with LMS.Test.Lab software. Then, the experiment of tracking the intercity rail is done, and the acceleration vibration response of the intercity rail under different speed levels is measured. According to ODS FRF concept, its operational deflection shapes (ODS) are given at the peaks of the ODS FRF envelope curve. Finally, according to the modal superposition principle, it is concluded that the typical ODS of the intercity rail under different speed levels is contributed by body’s up-and-down vibration, body’s nodding and body’s 1st order vertical bending. The results also show that the ODS with the same frequency may be contributed by different intrinsic modals and the frequency of the ODS may have some offset under different speed levels.