Piezoelectric six-dimension acceleration sensor based on 9-SPS parallel mechanism

Abstract

The invention provides a piezoelectric six-dimensional accelerator sensor based on a 9-SPS parallel mechanism, and relates to an accelerator sensor. The piezoelectric six-dimensional accelerator sensor comprises a shell (1), a cubic mass block (2), nine pieces of piezoceramics (3) and eighteen flexible spherical hinges (4); wherein the mass block is positioned in the center of the shell, and the upper surface, the front surface and the side surface of the mass block which are opposite to the shell are respectively provided with three pieces of piezoceramics to form three groups of piezoceramics together; the nine pieces of piezocermamics are cylindrical, and are connected with the mass block and the inner wall of the shell through the flexible spherical hinges (4); under the initial condition, the three groups of piezoceramics have pairwise orthogonal relation; and two pieces of piezoceramics on the upper surface are parallelly arranged left and right, two pieces of piezoceramics on the front surface are arranged up and down, two pieces of piezocermamics on the side surface are arranged front and back, and each group of piezoceramics is arranged symmetrically with the center of the mass block. The piezoelectric six-dimensional accelerator sensor has the advantages of simple structure, small volume, light weight, small measurement error, high precision, high sensitivity, high isotropy, wide signal band and the like.

Description

technical field [0001] The invention relates to an acceleration sensor, in particular to an improved piezoelectric six-dimensional acceleration sensor based on a 9-SPS parallel mechanism. Background technique [0002] In engineering, want to measure 10 -5 g to 10 5 The acceleration of g, the duration is from less than 1ms to tens of ms, without the need to replace the sensor, only the piezoelectric acceleration sensor can do it. At present, the sensors used for acceleration measurement in various countries in the world are basically piezoelectric. Piezoelectric acceleration sensors are not only suitable for general shock or vibration detection, but also suitable for detection or control operations under harsh conditions. It has simple structure, strong, small size, light weight, wide frequency response range (0.1HZ ~ 20000HZ), large dynamic range, high sensitivity, stable performance, good output linearity, can be used at room temperature and high temperature, and anti-ext...

AI Technical Summary

Problems solved by technology

The advantage of this kind of acceleration sensor is that it is isotropic; the disadvantage is that the electrical signal is obtained by pasting the strain gauge on the elastic body, so the sensor’s patch requirements are high, the precision is low, and the frequency response range is narrow, which is not suitable for accurate measurement of high frequency vibration signal

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