摘要
对驾驶室的模态研究中发现驾驶室顶板的振动不能忽视。通过模态试验得到驾驶室七阶模态频率(15.67Hz)下的振型表现为驾驶室顶板明显的垂向振动;运用薄板理论对驾驶室顶板进行固有频率计算,并与模态试验结果作比较;在Matlab/Simulink环境中建立两种驾驶室仿真模型,模型一:将驾驶室作为一个整体进行研究;模型二:将驾驶室顶板隔离作为一个单独部件进行研究;分别对两种仿真模型进行计算,分析驾驶室顶板振动对驾驶室地板处垂向振动的影响,结果显示驾驶室顶板对驾驶室地板处加速度方均根值的影响率为9%,峰值的影响率为2%～3%。同时还对驾驶室的七阶振型进行力学分析。从力学的角度分别对驾驶室出现绕z轴(垂直方向)的旋转现象以及轻微的左右摆动和前后俯仰现象进行定性分析。
In the modal research of cab, it is found that the cab roof panel vibration must not be ignored. The results of modal test indicate that when the natural frequency is 15.67 Hz （at 7th order frequency of cab）, the vibration mode of cab appears as obvious vertical vibration of cab roof panel. The natural frequency of cab roof panel is calculated by utilizing the thin plate theory and then compared with the modal test results. Two cab simulation models are built in Matlab/Simulink environment. In one model, the cab as a whole is studied; in another, the cab roof panel isolated as an independent component is studied. Then the two simulation models are computed respectively in a bid to analyze the effect of cab roof panel vibration on the vertical vibration of cab floor. The results indicate that the effect rate of acceleration rms of cab roof panel vibration on the cab floor comes to 9% while the effect rate of peak value is 2%-3%. Mechanics analysis on the vibration mode of 7th order is carried out. From the viewpoint of mechanics, qualitative analysis is carried out on the phenomena of swing, pitching and turning around the vertical direction of cab vibration mode.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第8期221-227,共7页
Journal of Mechanical Engineering
基金
江苏跃进农用车有限公司资助项目(2006141)
关键词
模态
驾驶室
顶板
振动
Mode Cab Roof panel Vibration
