某捷联陀螺环境应力筛选装置结构优化

Structure Optimization of Environmental Stress Screening Equipment for a Strap-down Gyroscope

为降低某捷联陀螺环境应力筛选装置的随机振动响应,对装置的结构进行优化。首先进行了模型的理论简化并建立了数学模型,运用模态分析理论和有限元软件对装置结构进行了振型和频率的理论分析和仿真计算。结果表明,该装置结构在1000 Hz频率附近存在z方向的振型,与陀螺仪谐振频率接近。根据理论分析的结果中相关参数对频率的影响关系,优化了系统结构,提高了系统在该方向的谐振频率,降低随机振动响应幅值。仿真计算和随机振动响应测试结果表明,改进后的结构谐振频率提高到预期效果,振动响应降低,满足了系统的使用要求。

The structure of an environmental stress screening equipment for a strapdown gyroscope is optimized to obtain a good random vibration response.Firstly,a simplified mathematical model is introduced,vibration modes and natural frequencies of the equipment are analyzed using modal analysis theory and finite element method,the results predict that there is vibration mode around 1000Hz frequency in z direction of the equipment,and 1000Hz frequency is close to gyroscope＇s natural frequency.According to theory analysis results,the structure of the system is optimized.Natural frequency of the system in this direction is improved,and random vibration response in this direction is good.Simulation results and random vibration response test prove that frequency of the optimized structure is improved to be good as expected,vibration response is good,which meet system＇s useness very well.