摘要
针对加速度传感器在爆炸与冲击测试中的应用,从理论与有限元仿真出发,分析传感器结构的静态响应与冲击响应。在15.4×10~4gn的静态载荷下,传感器结构最大应力超过材料的许用应力,将会发生结构断裂。在静态载荷下,加速度传感器在15.4×10~4gn的冲击加速度载荷下结构最大应力超过材料的许用应力,将会发生结构断裂。在加速度传感器的工作方向上施加幅值为15×10~4gn,半周期为5μs、10μs、20μs、30μs、40μs的半正弦加速度冲击载荷。在幅值为15×10~4gn、半周期为30μs的冲击载荷下,传感器的固定端处应力为334 MPa,将会使传感器断裂失效。在幅值为15×10~4gn、半周期为5μs、10μs、20μs的冲击载荷下,固定端处应力超过材料许用应力,将也会发生结构断裂。悬臂梁在半周期为5μs、10μs、20μs的冲击下,将会出现断裂。大体上,冲击载荷的周期越小,固定端的应力越大集中越严重。由于传感器固有周期为9.5μs,加速度传感器在半周期为10μs的冲击载荷下出现谐振,固定端处应力变大集中加剧。分析加速度传感器在冲击载荷下的结构响应为传感器的结构设计与具体应用时的可靠性分析提供了理论依据。
For the application of micro-accelerometer in the measurement of blast and impact load,the sensor＆#39;s static and impact structural response are analyzed by theoretical method and finite element analysis.Under static load,the max stress on the beam would exceed the allowable stress which will lead to the rupture of the accelerometer.In the working direction of accelerometer,the half-sine shock pulses with the same peak（15×104 gn）and different semi-period（5μs,10μs,20 μs,40μs）are added to the mass of the sensor.The cantilever will break under the shock whose semi-period is 5 μs,10 μs and 20 μsbecause of the stress centralization.The max stress on the sensor exceeds the allowable stress under a static load of 15×104 gn,which will lead to the rupture of the accelerometer.Under a shock load whose peak is 15×104 gn and semi period is 30 μs,the stress of the sensor＆#39;s fixed end is 334 MPa that may cause the fracture of the sensor.The sensor will also break under the shock load with the peak is 15×104 gn and the semi-period is 5 μs,10 μs,20 μsfor the fixed end＆#39;s stress exceeds the allowable stress.The smaller the period is,the bigger of stress is.The resonance arises when the structure is loaded by the impact with a cycle of 10 μs for the inherent cycle is 9.5 μs,which leads to a increase of the stress.The analysis of structure response of accelerometerunder shock pulse offers theoretical according for the structural design and the construe of reliability of the accelerometer.
出处
《传感技术学报》
CAS
CSCD
北大核心
2017年第2期194-199,共6页
Chinese Journal of Sensors and Actuators
基金
中国工程物理研究院电子工程研究所科技创新基金项目(S20161102)
关键词
冲击振动
结构响应
有限元分析
模态分析
加速度传感器
impact and vibration
structural response
finite element analysis
modal analysis
accelerometer
