【摘要】 尝试用动力分析的方法对压杆稳定问题进行理论分析与实验研究。推导出了压杆的轴向力与横向振动频率之间的关系表达式。分析中提出一种弹性压杆稳定平衡的动力学条件:弹性杆能在平衡位置附近产生微小振动,是稳定平衡;若不能产生振动,即自振频率为0时,是不稳定平衡,此时承受的压力值为临界力。以此关系为原理,建立一种利用现代振动测试技术来测试压杆临界力的方法。更多还原

【Abstract】 The paper trys to analyse stability of column by the method of dynamic analysis,deduces the formula of relation between axial compressive force and frequency of transverse vibration.In the analysis,dynamics condition of the stable equilibrium of flexibility column is put forward: if flexibility column can vibrate a little nearby equilibrium position,it is steady equilibrium;if flexibility column can’t vibrate,namely frequency of free vibration is zero,it is unsteady equilibrium,and the compressive force of this time is critical force.With the principle,we established another method that tests critical load of column by modern vibration technique.更多还原