某动力调谐陀螺挠性接头抗冲击能力分析

Anti-impact Capability Analysis of Flexural Joint of a Type of Dynamically Tuned Gyroscope

挠性接头是动力调谐陀螺中最薄弱的部分,在运输时,外界和弹体自身的振动和冲击不可避免地对挠性接头的薄弱环节造成较大的影响,对接头抵抗冲击能力的研究可以帮助制定储运策略。为了弄清某型动力调谐陀螺的挠性接头承受冲击载荷的能力,论文首先建立了陀螺的离散动力学模型,通过直接积分法得到系统在特定冲击作用下的响应,并根据响应得到挠性结构的变形;然后采用有限元方法计算挠性部分的应力和变形的对应关系,进而获得接头挠性结构处的应力;最后运用累积损伤理论对挠性接头的疲劳寿命进行了估算。结果表明该型陀螺能承受的极限冲击加速度约为150g^180g。

Flexural joint is the weakest component of Dynamically Tuned Gyroscopes （DTG）. Vibration and impact acting on the joint may break it when transporting. Research on its anti-impact capability can help to make plan for transporting the DTG. In order to know how intense impact the flexural joint can endure, firstly, a dispersed dynamic model of the DTG is established and the response under specifically impact load is calculated by direct integral method. Secondly, Relationship between stress and deformation of flexural structure is calculated by finite element method. Finally, a damage accumulating method is used to estimate its fatigue life. Results indicate that this type of DTG can endure an impact acceleration up to 150g-180g.