Transactions of Nanjing University of Aeronautics & Astronautics
Magnification Ratio of Mechanical Displacement Amplifier in Sensing Device
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Abstract:
In order to monitor deformation of high temperature components for a long time, a sensing device integrating a bridgeshaped mechanical displacement amplifier has been designed. This sensing device has higher resolution and accuracy than conventional extensometers. However, the relation between the magnification ratio and the structure size of the displacement amplifier is a bottleneck of sensing device design. Addressing this, the magnification ratio of a mechanical displacement amplifier is analytically derived based on its geometry structure. Six prototypes of the displacement amplifier made in propathene are manufactured, and an experimental system is set up to validate the accuracy of the established magnification ratio equation. Theoretical magnification ratios and experimental magnification ratios are compared and agree well, which verifies that the proposed equation is reliable. This analytical equation provides an effective design method for bridgeshaped mechanical displacement amplifiers with an expected magnification ratio.
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