摘要
针对螺栓刚度及预紧力对装配体模态、传递函数影响较大而在设备装配中因处理困难常被忽略问题,利用有限元计算、试验结合对比方法分析、研究。用ANSYS软件预应力模态分析及谐响应分析对装配体进行仿真计算;对三种刚度螺栓分别施加相同预紧力,对钢制螺栓施加六组不同预紧力进行试验;分析对比计算值与试验值误差。结果表明,忽略接触阻尼的计算值与试验值存在最大误差约15%;同一预紧力时,随螺栓刚度的提高固有频率呈增大趋势,各阶频率的最大变形量随之增大;随预紧力的增大,结构传递函数趋于明朗化。
Bolt stiffness and pre-tightening force have great impact on structural vibration modes and transfer functions, which is often ignored in actual assembling because of the difficulty in treatment. By comparing the finite element calculation data and test data of three kinds of bolts with different stiffness under different pre-tightening force, the changes of structure modes and transfer function were analyzed. By using the ANSYS software, the vibration modes and harmonic responses under prestressed condition were investigated. Then the tests reguarding three kinds of bolts with different stiffness under the same pre-tightening force were carried out, and as to the steel bolt the tests were performed under six groups of pre-tightening forces. Finally, the differences between the calculation data and the test data were studied. The results show that the calculation results differ about 15% from the test data due to the ignorance of contact damping. Under the same pre-tightening force, natural frequencies increase with the increase of the bolt stiffness, and the maximum distortion also increases. The transfer function will be easier to be clearly expressed as the pre-tightening force increases.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第2期178-182,共5页
Journal of Vibration and Shock
关键词
螺栓刚度
预紧力
模态
传递特性
误差分析
bolt stiffness
pre-tightening force
modal
transfer characteristics
error analysis
