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首页> 外文期刊>IEEE sensors journal >A Novel Threshold Accelerometer With Postbuckling Structures for Airbag Restraint Systems
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A Novel Threshold Accelerometer With Postbuckling Structures for Airbag Restraint Systems

机译：具有后屈曲结构的新型阈值加速度计，用于安全气囊约束系统

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摘要

Based on the postbuckling theory of large deflection beams, the nonlinear stiffness of a postbuckling beam is deduced and in agreement with the results of buckling experiments. Then, a novel postmachined threshold accelerometer is designed, which consists of eight oblique postbeams with an inertial mass in the middle to ensure its single moving direction and an electrical contact part fabricated on the bottom of the inertial mass. The threshold accelerometer is an integration of a threshold sensor and an inertial driven actuator used in airbag restraint systems. When the acceleration reaches the threshold, the beams buckle and close the threshold accelerometer, and when it gets down to be a certain value, the accelerometer opens quickly under the effect of the elastic force developed by the postbuckling beams. Compared with the design models of other threshold accelerometers with linear beam structures, the nonlinear postbuckling beams are introduced as threshold sensing elements. A number of design factors such as the air film damping and the contact force are taken into full consideration, thus establishing the dynamic equation of the accelerometer under coupled forces. The dynamical simulation for the strong nonlinear system with elliptic integrals indicates its good threshold characteristic and high contact reliability. The threshold accelerometer responds within 4 ms when it is triggered by a threshold acceleration ${rm ac}=20$ g, and cuts off quickly when the cutoff acceleration is under ${rm ad}=5$ g. Meanwhile, the unstable contact time is only 0.02 ms for the contact force to reach 50 mN , which guarantees the contact resistance to be less than 20 m$Omega$. With the results of the dynamic simulation, supported by previous buckling experiments, the accelerometer can provide accurate threshold sen-sing without false actuations under interferences outside, especially electromagnetic and vibration interferences, and hence their wide applications in safe-arming systems.
机译：基于大挠度梁的后屈曲理论，推导了后屈曲梁的非线性刚度，并与屈曲实验结果相吻合。然后，设计了一种新型的后加工阈值加速度计，它由八个倾斜的后梁组成，中间有一个惯性质量以确保其单个移动方向，而电接触部分则制造在惯性质量的底部。阈值加速度计是安全气囊约束系统中使用的阈值传感器和惯性驱动执行器的集成。当加速度达到阈值时，梁弯曲并关闭阈值加速度计，当加速度下降到某个值时，加速度计在后屈曲梁产生的弹力的作用下快速打开。与其他具有线性梁结构的阈值加速度计的设计模型相比，引入非线性后屈曲梁作为阈值传感元件。充分考虑了许多设计因素，例如气膜阻尼和接触力，从而建立了在耦合力作用下的加速度计的动力学方程。具有椭圆积分的强非线性系统的动力学仿真表明，该系统具有良好的阈值特性和较高的接触可靠性。当阈值加速度由阈值加速度$ {rm ac} = 20 $ g触发时，阈值加速度计会在4毫秒内做出响应，而当截止加速度低于$ {rm ad} = 5 $ g时，阈值加速度计会迅速切断。同时，接触力达到50 mN时，不稳定的接触时间仅为0.02 ms，从而确保接触电阻小于20mΩ。借助先前的屈曲实验所支持的动态仿真结果，该加速度计可以提供精确的阈值检测，而不会受到外界干扰（尤其是电磁干扰和振动干扰）的误操作，因此在加速度计安全系统中得到了广泛的应用。

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