Abstract:

In order to meet the requirements of complicated kinetics during the launch phase of space payload, and to realize separation between payload and satellite after in orbit, a separable clamp-band supporting structure was designed. The separation was driven by explosive bolts, and the relation between axial force of the bolts and tightening torque was analyzed. The contact model of finite-element for the structure was established and then the analyses for pre-tightening force and axial loading were conducted respectively. The analyses show that the stress in the bands decreases gradually away from the tightened bolts, the larger the coefficient of friction of the contact region, the smaller with maximum stress of clamp band. Two failure modes were analyzed. The results of the vibration show RMS acceleration magnification in three directions is very small, all of the first-order modes are greater than 200Hz, which meets the requirements of stiffness and load capacity, the device is unlocked with high reliability, and have good attenuation characteristics of impulse response.

Key words: separable supporting structure, clamp band, pyrotechnic, contact analysis

摘要：

为了满足空间载荷在发射阶段的复杂动力学特性要求，并满足入轨之后的解锁分离，设计了一种爆炸螺栓驱动的包带式解锁支座，并对其进行了受力分析和爆炸螺栓拧紧力矩加载分析。建立了包带与支座的接触有限元模型，进行了预紧力加载分析和轴向拉伸载荷分析。由分析结果可知，包带上的应力分布沿着远离夹紧区域的方向逐渐减小，同时啮合区域的摩擦因数越大，包带的最大应力越小。分析了两种故障模式及其处理措施。振动试验表明：3个方向的均方根加速度放大倍率都很小，其一阶模态全部大于200Hz，满足刚度和承载能力要求；同时该装置解锁可靠性高，具有良好的冲击响应衰减特性。

关键词: 解锁支座, 包带, 火工品, 接触分析