Failure frequency sensitivity based method for arranging vibrating sensor of helicopter gearbox

Abstract

The invention discloses a failure frequency sensitivity based method for arranging a vibrating sensor of a helicopter gearbox, comprising the following steps of: (1) constructing a three-dimensional model of the helicopter gearbox; (2) establishing a finite element model of the helicopter gearbox; (3) analyzing the modality of the finite element model of the helicopter gearbox; (4) analyzing the harmonic response of the finite element model of the helicopter gearbox; and (5) determining the installation position of the vibrating sensor of the helicopter gearbox. The invention can rapidly and precisely determine the optimum arrangement position of the vibrating sensor for the traditional gearbox, also has the directive function on reserving the installation position of the sensor for the gearbox in design, and has the important significance on fully acquiring the early failure signals of the gearbox for early failure diagnosis.

Description

technical field [0001] The invention relates to a method for determining the installation position of a vibration sensor, in particular to a method for arranging a vibration sensor of a helicopter gearbox based on fault frequency sensitivity, and belongs to the technical field of vibration fault diagnosis of a helicopter gearbox. Background technique [0002] Since 1991, when the first helicopter equipped with a certified Health&Usage Monitoring System (HUMS) came out, more and more helicopters are equipped with HUMS in various countries in the world, and the vibration sensor is the helicopter usage and monitoring system ( An important part of HUMS). At present, many literatures have no clear instructions on the installation position of the gearbox vibration sensor, but it is generally believed that the vibration sensor should be installed as close to the bearing as possible. When measuring radial vibration, the vibration sensor is generally installed on the outside of the ...

AI Technical Summary

Problems solved by technology

[0004] Disadvantages of the current technology: the installation position of the vibration sensor is determined based on experience, and it cannot be guaranteed that the selected installation position is the best installation position. When the operating frequency changes, the vibration amplitude at the position of the vibration sensor may suddenly decrease

However, the method of modal testing is used to determine the installation position of the vibration sensor, which is time-consuming, laborious and expensive, and because the high-order modes are difficult to excite, the results obtained often cannot meet the requirements.

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