摘要
研究陀螺加速度计精细化建模仿真分析方法.对整表结构进行了有限元网格划分,采用螺栓单元法进行简化处理,通过虚质量法对高密度浮油进行建模,计算外环轴轴承相关参数,并通过刚度轴承建模法进行仿真,建立了精细化陀螺加速度计有限元仿真模型.通过模态测试与模态仿真相对比,验证了有限元仿真模型的有效性.基于有限元模型,分析研究了在过载条件下外环轴轴承预紧力对仪表浮子质心偏移的影响,并据此进一步分析了预紧力对整表精度的影响.结果表明:适当提升外环轴预紧力有助于提高整表精度;过高的预紧力会导致精度下降,预紧力对于精度的影响大小也与视加速度相关.
This paper studied the refined modeling and simulation method for pendulous integrating gyro accelerometer(PIGA).The structure of the whole instrument was meshed by finite element method(FEM).Bolt connectors were used to simplify the model.Virtual mass method was used to model the floating oil.The parameters of bearing of outer ring axis were calculated,and the stiffness-bearing method was used to model the bearing in FEM model.Using these methods,a refined FEM simulation model was established.The accuracy of the model was tested by a modal test.Based on the FEM simulation model,the relationship between the bearing preload and the center of mass deviation of the floater in overload situation was simulated.And further analysis between the bearing pre-load and accuracy was conducted.The results show that raising the bearing preload helps raise the accuracy of the whole instrument.But if the preload is too high,the accuracy will be decreased.In addition,the apparent acceleration is also releated to the accuracy of PIGA.
作者
荣吉利
杨梓航
周晓俊
李亮
李剑峰
刘睿
程修妍
RONG Jili;YANG Zihang;ZHOU Xiaojun;LI Liang;LI Jianfeng;LIU Rui;CHENG Xiuyan(School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Aerospace Control Devices,Beijing 100039,China)
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2024年第12期1233-1240,共8页
Transactions of Beijing Institute of Technology
基金
基础研究项目群资助项目(514010208-202)。
关键词
陀螺加速度计
有限元仿真
模态测试
误差预示
pendulous integrating gyro accelerometer(PIGA)
finite element method(FEM)simulation
modal test
error prediction
