含非线性接触碰撞的大口径舰炮弹链柔性铰多体模型

A multibody model with flexible joints and the nonlinear contact-impact of an ammunition chain of a large caliber naval gun

针对某型大口径舰炮在供弹过程中因炮弹晃动过大引起的扬弹机卡弹问题,建立了含非线性接触碰撞、摩擦的弹链柔性铰多体动力学模型,采用递推的方法得到弹链的运动学和动力学方程,给出了柔性铰刚度系数、接触刚度系数分别按材料和接触表面特征计算的方法.在不同材料的弹筒以及不同片弹簧刚度系数下的计算结果表明,钢制弹筒比铝制弹筒能更好地限制炮弹晃动,增大片弹簧刚度系数可以减小炮弹晃动,但增加到某一数值后作用并不明显.研究为减小炮弹的晃动、提高某型大口径舰炮链式供弹平台供弹可靠性和安全性提供了理论依据.

Due to the jamming problem of the ammunition hoist of a large caliber naval gun caused by excessive rocking of shells occurring during the ammunition feeding process,a new ammunition chain multibody dynamic model with flexible joints was established.In the ammunition chain dynamic model,the nonlinear contact-impact and friction characteristics were also considered.Kinematic and dynamic equations of the ammunition chain were developed by using the recursive method,and the calculation methods of stiffness coefficients of flexible joints and contact were also presented.The calculation results which were obtained in the situations where the shell container was made of different materials and the leaf spring had different stiffness coefficients show that a steel shell container can restrict the rocking of shells better than an aluminum container.Also,increasing the leaf spring stiffness coefficient can decrease the rocking of shells but has no obvious effect when it reaches a certain value.The research provides a theoretical basis for decreasing the rocking of shells and improving the feeding reliability and security of a chain feeding platform of a large caliber naval gun.