Abstract
Acceleration switch can trigger switches according to the variation of external acceleration without complex control system and circuit. With the excellent characteristics of integration of sensor and actuator, zero power consumption and high reliability, multi-threshold acceleration switch has great application value in the fields of vehicle safety, aerospace and industrial equipment. In order to reduce the complexity of the measurement system and improve the reliability, we realized the design of a multi-threshold and anti-overloading acceleration switch which can distinguish specific pulse width. Additionally, the magnetic elastic contact is designed to prevent the rebound phenomenon when switch is overloaded. Considering the coupling force of spring, magnetic elastic contact and magnetic, we built the dynamic model and analysed the influence of the acceleration threshold and the pulse width on the switch actuation. The numerical simulation shows that the proposed switch has accurate sensitivity of acceleration excitation with specific threshold and certain pulse width, and it also has the ability of anti-overload. Consequently, the proposed method provides a new method for designing acceleration switch.
Highlights
In the detection of mechanical equipment, acceleration monitoring is significant, especially in automotive safety, aerospace, industrial robots, engineering vibration measurement and military fields
Accelerometer is a kind of inertial sensor for acceleration measure, and acceleration switch is a kind of inertial device with the function of acceleration sensors and actuators
It has the function of acceleration threshold induction, and the switch can trigger after reaching the design threshold
Summary
In the detection of mechanical equipment, acceleration monitoring is significant, especially in automotive safety, aerospace, industrial robots, engineering vibration measurement and military fields. This paper mainly introduces the design of a multithreshold and anti-overload acceleration switch based on Matlab, and carries out analysis of statics and dynamics. A kind of acceleration switch with dual directional adjustable threshold function designed by Kim H et al [3] Which can detect bilateral acceleration by a flexible beam structure. The design of acceleration switch mostly uses simple beam structure and single physical field structure, which is difficult to realize multi-stable function, and the contact force is unstable. Aiming at the problems of single threshold, unstable contact and slow response of the acceleration switch, a design model of mechanical self-hold and multithreshold bidirectional acceleration switch based on five steady-state mechanism is proposed. The static and dynamic characteristics of the acceleration switch are analysed based on the magnetic charge model and the elastic mechanics. The paper provides a new idea and method for the design of multi-threshold and anti-overload acceleration switch
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