A wide-band piezoelectric vibration sensor assembly structure

Abstract

The invention relates to an assembly structure of a broadband piezoelectric vibration sensor, comprising a broadband piezoelectric component (1), a housing (2), a top cover plate (3), pins (4), lugs (5) and lead wires (6) , characterized in that: the housing (2) is sealed and fixed with the contact pin (4), the broadband piezoelectric component (1) is installed in the housing (2), and the contact pin (4) is used to lead out the broadband piezoelectric component (1) The lead wire (6), the top cover plate (3) is installed on the top of the shell (2). The broadband piezoelectric component adopts a shear structure and reduces the height of the shell and the center of gravity of the structure, which is conducive to improving the resonance frequency and frequency response range.

Description

technical field [0001] This patent realizes the reliable mechanical and electrical connection between the piezoelectric component and the high-temperature-resistant sealed shell on the basis of the planar shear structure piezoelectric component, and belongs to the field of airborne broadband charge output piezoelectric vibration sensor. Background technique [0002] Purpose: In recent years, piezoelectric vibration sensors have been gradually applied and promoted on new or newly developed aero-engines. The common central compression structure airborne piezoelectric vibration sensors have a frequency response of 5% error due to structural design limitations. At about 2.5kHz, the frequency response of 1dB error is only about 5kHz. Considering the replaceability of the installation in the airborne application environment and the development of airborne vibration testing technology, the promotion of engine vibration testing method research and the demand for wide-band vibration ...

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Problems solved by technology

[0004] Effect analysis: the commonly used central compression airborne piezoelectric vibration sensor such as figure 1 As shown, the biggest advantage of the central compression type is that the vibration resistance level is relatively large, but the piezoelectric component of this structure has a high center of gravity, a large mass, and a high shell height, resulting in a low frequency response. Generally, the frequency response range of 5% deviation is 2.5kHz

Moreover, the aspect ratio of the piezoelectric component and the inner cavity of the shell of this type of product is large, which makes the assembly difficulty correspondingly increased, and it is easy to cause structural fracture in the transverse direction under the condition of large-scale vibration

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