【摘要】 拖拉机覆盖件的振动影响到某些零部件的疲劳强度、寿命和仪器设备的正常工作，本文通过对拖拉机覆盖件的振动测试和模态试验，对其振动特性进行了分析，提出了改进建议。更多还原

【Abstract】 ?The fatigue strength, service life of certain parts and even the performance of instruments on tractors are often influenced by the vibration from sheet-metal parts. With the measuring and modality test of the vibration from tractor sheet-metal parts. The vibration characteristics are analysed and suggestions for improvement have been proposed更多还原