轴向运动梁受移动载荷作用的横向动力响应

摘要

A finite element model of an axially moving beam under a moving load was established, and a method called node's life and death was put forward to describe the state of nodes on the moving beam. This method made number and length of elements of the model unchanged, the parameters of nodes under the condition of different time steps transferred with less error, and thus it overcame the shortcomings of the methods with changing number or length of elements. Finally, a finite element dynamic model of a gun firing in two different launch ways was established using this method and the lateral dynamic responses of its muzzle points were calculated. Compared with the results of previous algorithms, the study showed that the results of this method agree better with the actual situation.%建立了轴向运动梁受移动载荷作用的有限元模型,提出了描述运动梁节点约束状态的节点生死方法.该方法使得单元数目及长度固定不变,节点的参数在不同时间步下无缝传递,克服了采用单元数目或长度改变的方法引起的精度不足的缺点.最后利用该方法建立火炮在两种发射方式下的有限元动力学模型,计算其炮口点横向动力响应,并和采用以往算法的结果进行比较,表明用该方法计算的结果比较符合实际工况.