Built-in amplifying circuit ring shear piezoelectric component structure

Abstract

The invention, which belongs to the field of the voltage output type annular shearing type piezoelectric vibration sensor, relates to an annular shearing piezoelectric assembly structure with a built-in amplification circuit, thereby realizing reliable mechanical and electrical connection between a built-in charge amplifying circuit board and the piezoelectric assembly based on the annular shearing type piezoelectric assembly. A pedestal is designed to have a truncated-cone stepped circular ring structure; nested fixed connection between a stepped circular ring structure of a mass block and the built-in charge amplifying circuit board is realized by connection and fixation between internal and external cylindrical electrode surfaces of a piezoelectric element and the mass block; and for signal transmission, lead-free connection is realized by the electrode plane of the built-in charge amplifying circuit board. According to the invention, with the annular shearing piezoelectric assembly structure, engineering application problems of low shear structure strength, poor vibration stability, and poor lead reliability and the like are solved; the resonance frequency, reliability, structural strength of the mechanical structure are enhanced; the frequency response range of the piezoelectric assembly is extended; the anti-large-order non-destructive capability is improved; and large-order or resonance-band relative displacement of the built-in charge amplifying circuit board and the mass block as well as lead swinging at a low-order harmonic frequency point is eliminated.

Description

Technical field [0001] The ring shear piezoelectric component structure with built-in amplifying circuit of the invention belongs to the field of voltage output type ring shear piezoelectric vibration sensors. Background technique [0002] At present, the new or newly developed piezoelectric sensor for aero-engines in China has a compression structure, low anti-environmental interference, and is three-hole installation, the installation direction is fixed. In the complex airborne application environment, it cannot achieve its 360° The direction is convenient for installation, and sometimes it interferes with other oil circuits, gas circuits or lines on board. The existing form of charge output is highly dependent on the external airborne charge amplifier and low-noise cables. [0003] The existing shear type piezoelectric vibration sensor, such as a plane shear type structure, an independent built-in top fixed circuit board, a small fixed fulcrum area, low fixing strength, easy to...

AI Technical Summary

Problems solved by technology

[0002] At present, the domestic new or newly developed piezoelectric sensors for aero-engines are compressed structures with low environmental interference resistance, and are installed in three holes, and the direction of the installation line is fixed. In the complex airborne application environment, it cannot realize its 360° The direction is convenient for installation, sometimes it will interfere with other oil circuits, gas circuits or lines on board

The existing form of charge output is highly dependent on external on-board charge amplifiers and low-noise cables

[0003] Existing shear piezoelectric vibration sensors, such as planar shear structure, have an independent built-in top fixed circuit board, small fixed support point area, low fixed strength, easy to form a ring-shaped vibration mode, non-rotational symmetric cantilever beam type The structure is easy to produce a lower frequency first-order resonance point in a certain transverse direction, and the effective connection length or rigid section of the central bottom hole thread is small

Moreover, the traditional annular shear structure has no effective and reliable built-in circuit installation structure and space, and the level of mechanical vibration resistance depends entirely on the shear strength of the adhesive layer, which cannot withstand a large number of shock vibrations

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