具有偏心载荷的滑动螺旋传动计算方法研究

Research on the Calculation Method of Sliding Screw Drive with Eccentric Load

在热发射领域需要锁弹机构锁紧和推动导弹,通常采用自锁型滑动螺旋传动。在以往的研究设计中,螺旋传动的输出载荷一般通过螺旋传动中心,缺少输出偏心载荷时滑动螺旋传动的计算方法。通过建立某锁弹机构的受力模型,利用理论力学分析方法得出了输出偏心载荷时螺旋传动输出作用力与驱动力矩之间的计算公式,并通过有限元仿真计算和原理样机试验验证了该计算方法的正确性。研究成果表明,对于输出偏心载荷的滑动螺旋传动,必须考虑载荷偏心所带来的附加力及其摩擦影响,可以利用理论力学和有限元仿真的计算方法,为机构设计时判断驱动力矩与输出载荷提供支持,对相关专业产品具有借鉴意义。

In the field of vertical thermal launching,the missile needs locking mechanism to lock and push up,and usually the self-locking sliding screw drive is adopted. In the previous research and design,the output load of the screw drive is generally through the center of the screw,and the calculation method of sliding screw drive with eccentric load does not exist. Through the establishment of the force model of a locking machanism,the calculation formula of the output force and driving torque of the screw drive with eccentric load is obtained by using the method of theoretical machanics analysis,and the correctness of the method is verified by finite element simulation and prototype test. The research results show that the additional force and the friction effect of the eccentric load should be taken into account for the sliding screw dirve with eccentric load,and the calculation method of theoretical machanics and finite element simulation can be used. The paper provides support for calculating the driving torque and output load of the mechanism,and it can be used as reference for the related professional products.