基于瞬态动力学的弹载MEMS陀螺抗冲击特性分析  

Analysis of Anti-shock Characteristic of Missile Borne MEMS Gyroscope Based on Transient Dynamic Method

作　　者：贺江涛 陈再春 HE Jiangtao;CHEN Zaichun(Xi'an Aerospace Solid Propulsion Institute,Xi'an 710025,China;Chongqing Godarrow Inertial Technology Co.,Ltd.,Chongqing 400060,China)

机构地区：[1]西安航天动力技术研究所,西安710025 [2]重庆天箭惯性科技股份有限公司,重庆400060

出　　处：《计算机测量与控制》2025年第3期138-144,共7页Computer Measurement &Control

摘　　要：针对微机械(MEMS)陀螺在冲击环境下的适应性问题,对导弹发射初始段MEMS陀螺的抗冲击特性进行了分析;运用傅里叶变换分析了发射初始段的冲击载荷特征;采用瞬态动力学方法结合有限元分析,综合考虑了冲击信号特征、金属壳体力学传递、MEMS陀螺抗冲击指标等因素,计算了弹载MEMS陀螺安装处的冲击响应;实验结果表明:由于高频冲击信号与惯性测量单元金属壳体的二阶模态频率相近,使得弹载MEMS陀螺所承受的力学冲击量级放大了约4倍,达到879 g,致使发射初始段弹载MEMS陀螺存在失效风险,因此在工程应用时应采取一定的防护措施。Aiming at the adaptability of missile-borne micro-electro-mechanical system(MEMS)gyroscope in shock environments,the anti-shock characteristic of MEMS gyroscope is analyzed during the initial stage of missile launch.The characteristics of shock signal are analyzed using Fourier transform.The transient dynamics method and finite element analysis method are used to comprehensively consider the characteristics of the shock signal,the mechanical transmission of the metal shell,and the anti-shock index of MEMS gyroscope,and calculate the shock response at the installation position of the missile-borne MEMS gyroscope.Experimental results show that the high-frequency signal is close to the second order modal of the inertial measurement unit(IMU)metal shell,the mechanical shock of the missile-borne MEMS gyroscope is amplified by about 4 times,reaching 879 g,which leads to a risk of MEMS gyroscope failure in initial launch stage.Therefore,it should take some protective measures in engineering applications.

关 键 词：微机械陀螺 瞬态动力学 固有频率 抗冲击 失效 冲击试验 

分 类 号：TP206[自动化与计算机技术—检测技术与自动化装置]