Design and Simulation of Centrifugal G-switch
Date Issued
2011
Date
2011
Author(s)
Liu, Meng-Chieh
Abstract
In this thesis, a centrifugal G-switch was designed and its performances were simulated by ANSYS/LS-DYNA. When a centrifugal G-switch subjected to a threshold centrifugal acceleration field, the switching mechanism inside the centrifugal G-switch will turn on and deliver signals to initiate the subsequent processes.
A G-switch is a device as placed in a critical acceleration field, the accelerometer inside G-switch will turn on and delivers a output signal to trigger subsequent processes. As the G-switch receives an impulsive acceleration from environment, the proof mass experiences an inertial force which moves the contacts in touch to trigger a contact signal. The difference between a centrifugal G-switch and a general G-switch is that the centrifugal G-switch is designed for steady acceleration field. Therefore, the consideration of stability and safety is essential in the G-switch.
Accordingly, the centrifugal G-switch designed in this thesis is composed of a latch mechanism and an accelerometer. Because the centrifugal acceleration is determined by the product of square of the angular speed and the distance between the mass centroid of the proofmass of the G-switch and rotation axis, we set the centrifugal G-switch will not turn on at 1,000 rpm and turn on at 2,000 rpm. With considerations of various geometry conditions, the proposed centrifugal G-switch can meet these two situations. Numerical simulations of the G-switch indicate that the designed G-switch can function properly under these two rotation situations. In addition to an axial acceleration impact of 1000G, all components of the centrifugal G-switch are in the elastic region of the silicon, based on which the G-switch will be fabricated.
Subjects
G-switch
centrifugal acceleration
micro accelerator
impact simulation
Type
thesis
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