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Acquisition circuit of airborne vibration signals of engine

A vibration signal and acquisition circuit technology, which is applied in the field of aero-engine vibration monitoring, can solve the problems of sensor vibration signals mixed with interference signals, signal saturation, etc., and achieve the effects of simple circuit structure, suppression of input interference, and strong practicability

Inactive Publication Date: 2016-05-11
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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Problems solved by technology

[0006] The applicant found that the reason for the problem of signal saturation is: during the process of rapid changes in engine speed such as starting and stopping, extremely low-frequency interference signals are mixed into the vibration signal of the sensor

Method used

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  • Acquisition circuit of airborne vibration signals of engine
  • Acquisition circuit of airborne vibration signals of engine
  • Acquisition circuit of airborne vibration signals of engine

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0028] like Figure 1-5 As shown, the engine onboard vibration signal acquisition circuit includes a lightning protection circuit, a high frequency filter circuit, an improved single-ended charge amplifier circuit and a high-pass filter circuit. The lightning protection circuit is composed of a transient suppression circuit to achieve lightning protection for the subsequent circuit; the high-frequency filter circuit is connected to the lightning protection circuit, which can perform high-frequency filtering on the input charge signal to suppress high-frequency interference signals in the vibration signal ; The single-ended charge amplifier circuit realizes the amplification of the engine charge signal and transforms it into a voltage signal, and at the same time filters out the low-frequency interference signal in the engine vibration signal; there is a certa...

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Abstract

The invention provides an acquisition circuit of airborne vibration signals of an engine. A capacitor C4 used for filtering extremely-low frequency interference signals is added in front of a current limiting resistor of a negative input end of an operational amplifier of a single-ended electric charge amplification circuit. A feedback resistor R1 of the operational amplifier is connected to a joint between the capacitor C4 and the current limiting resistor. A feedback capacitor C3 is connected to the front end of the capacitor C4. The capacitance of the capacitor C4 is determined by working characteristics of the engine during change of rotation speed. According to the invention, complex interference signals in engine vibration signals of the engine can be effectively filtered and precise acquisition of the electric-charge type engine vibration signals is achieved.

Description

technical field [0001] The invention belongs to the technical field of vibration monitoring of aero-engines, and in particular relates to a circuit for accurately collecting charge-type vibration signals. Background technique [0002] In the actual work of an aeroengine, due to the complex load and changing working environment, there are often many vibration signals. Some of these vibration signals are related to the inherent characteristics of the system, and some are related to the failures that have occurred or are about to occur. In order to accurately detect and diagnose engine faults, accurate collection of vibration signals is the basis of the above work. Piezoelectric vibration sensor is one of the most commonly used and widely used sensors at present. It has the advantages of high reliability, convenient installation, and wide frequency band. Its output signal is a charge signal. [0003] Commonly used charge signal acquisition circuits include voltage amplifiers a...

Claims

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Application Information

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IPC IPC(8): G01H11/08
CPCG01H11/08
Inventor 马萌赵小勇冯健朋马振华
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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