无人机惯导减振系统设计及其支架拓扑优化
Vibration Isolation Design and Bracket Topology Optimization for UAV Inertial Navigation System

支架作为惯导减振系统的重要组成部分，其动态特性对惯导减振系统的影响不可忽视。以某型号无人机惯导减振系统为例，根据其动态特性要求，对该系统的减振器参数进行了设计与工艺匹配；其次，基于变密度法对支架进行了拓扑优化，质量减少了19.9%，系统的一阶固有频率由57.09 Hz提高到58.76 Hz。最后，分别进行了惯导减振系统线振动和角振动实验，实验结果表明：优化后惯导减振系统的谐振频率为55 Hz，最大加速度传递率为2.2，-3 dB带宽在30~40 Hz范围内，相位滞后在5.16°~9.17°内，均满足设计要求。说明该惯导减振系统的设计及其支架拓扑优化方法是有效的。
As one of important components in an inertial navigation system (INS), bracket's dynamic characteristics have a significant influence on INS. Taking the damping system of a certain type unmanned aerial Vehicle (UAV) as an example, the system parameters have been designed and process-matched according to the requirements of dynamic characteristics. Then, the topology optimization design has been carried on the bracket by using the variable density method. After optimization, the mass of the bracket has been reduced 19.9%, and the first order natural frequency of the damping system has been increased from 57.09 Hz to 58.76 Hz. Finally, the line vibration and angular vibration tests have been done on the inertial navigation damping system. The results show that the resonant frequency of the INS damping system optimized is 55 Hz, the maximum acceleration transmissibility is 2.2, -3 dB bandwidth is in the range of 30~40 Hz, and phase lag is 5.16°~9.17°, all of these can meet the design requirements, which represents that the INS damping system design and the bracket topology optimization method are valid