摘要
为了减小外界的振动和冲击对微惯性测量单元(MIMU)输出精度的影响,结合多自由度减振理论和MEMS传感器支撑要求,设计了一种凸台式MIMU支架,选择合适的减振器安置方式,得到一种结构紧凑、质量轻巧的MIMU橡胶减振系统。该系统具有足够的刚度,从而保证结构的稳固,且便于安装,橡胶减振器的设置有效的降低了振动传递和耦合。为了准确描述橡胶性能,采用Mooney-Rivlion本构模型来模拟橡胶材料,根据经验公式确定了减振橡胶材料的参数。建立了减振系统的实际形态有限元模型,并进行动态特性分析,结果表明系统的前10阶固有频率均远离外界激励385~425 Hz;考虑橡胶变形量较大,在瞬态响应分析中以减振系统中的电路板的变形角作为评价减振的依据,结果表明电路板的变形角为0.06°,符合设计标准,且与未减振的MIMU相比,具有良好的减振效果。
In order to reduce the impact of external vibrations and shocks on the output accuracy of the micro inertial measurement unit(MIMU),combining the requirements of MEMS sensor support and multi-degree-of-freedom vibration reduction theory,a suitable damper placement method was selected and a MIMU rubber vibration damping system was designed.The MIMU structure has the characteristics of light weight and small volume,and has sufficient rigidity to ensure the stability of the structure,and the setting of the rubber shock absorber effectively reduces the vibration coupling.In order to accurately describe the rubber properties,the Mooney-Rivlion constitutive model is used to simulate the rubber material,and the parameters of the vibration-damping rubber material are determined according to the empirical formula.The actual shape finite element model of the vibration reduction system was established,and the dynamic characteristics analysis was carried out.It is obtained that the first 10 natural frequencies of the system were far away from the external excitation 385~425 Hz.Considering the large deformation of rubber,the deformation angle of the circuit board in the vibration damping system is taken as the evaluation criterion in the transient response analysis.The results show that the deformation angle of the circuit board is 0.06°,which meets the design standard,and has a good vibration reduction effect compared with the MIMU without vibration reduction.
作者
李可
王宇
吴志强
Li Ke;Wang Yu;Wu Zhiqiang(College of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《电子测量技术》
北大核心
2021年第7期113-117,共5页
Electronic Measurement Technology
基金
国家自然科学基金青年科学基金(61803203)项目资助
