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动力稳定性是细长杆件的一种重要性能,结合精细传递矩阵理论,建立了在轴向冲击荷载作用下受压杆件动力稳定分析的精细传递矩阵式,并对冲击荷载的参数进行了分析,研究其对受压杆件动力稳定性能的影响.算例表明:受压杆件的动力稳定性可以通过结构的位移响应曲线是否存在反规律现象来确定.算例还表明结构的动力稳定性不仅与冲击荷载的幅值有关,还有荷载的振动频率有关;荷载频率与结构自振频率之间的差异影响着受压杆件动力稳定承载力的大小.
Dynamic stability is an important property of slender rod. Based on the theory of fine transfer matrix, the fine transfer matrix of dynamic stability analysis of rod subjected to axial impact load is established, and the parameters of impact load The results show that the dynamic stability of the bar under compression can be confirmed by the existence of the anti-law phenomenon of the displacement response curve of the structure.The examples also show that the dynamic stability of the structure It is not only related to the amplitude of impact load, but also the vibration frequency of load. The difference between load frequency and natural frequency of structure affects the dynamic bearing capacity of the bar.