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Measuring Method of Stress and Strain of Dedendum Root of Fixed Sun Gear of Planetary Gear System

A technology of fixed center and planetary gear train, applied in the direction of machine gear/transmission mechanism testing, measuring devices, instruments, etc., can solve the problems of many wiring harnesses, complicated installation, inconvenient on-site application, etc., to prevent electromagnetic interference, simple structure , the effect of easy installation

Active Publication Date: 2017-02-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the electrical measurement method for multi-point measurement, more wiring harnesses are used, the installation is complicated, and special measures need to be taken to enhance the anti-electromagnetic interference ability of the system, so the field application is not very convenient

Method used

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  • Measuring Method of Stress and Strain of Dedendum Root of Fixed Sun Gear of Planetary Gear System
  • Measuring Method of Stress and Strain of Dedendum Root of Fixed Sun Gear of Planetary Gear System
  • Measuring Method of Stress and Strain of Dedendum Root of Fixed Sun Gear of Planetary Gear System

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Embodiment Construction

[0029] The Basic Principle of Measuring Stress with Fiber Bragg Grating

[0030] A fiber grating is composed of a core and a cladding. When broadband light is incident into the fiber grating, the incident light wave with a central wavelength that satisfies certain conditions will be reflected. This wavelength is called the Bragg wavelength. The expression for the Bragg wavelength is:

[0031] lambda B =2n eff Λ (1)

[0032] where n eff is the effective refractive index of the fiber core, and Λ is the grating pitch of the fiber grating.

[0033] When the fiber is subjected to axial stress, the grating pitch and refractive index change due to stretching and elastic-optic effects, which in turn causes the fiber Bragg wavelength to shift. The wavelength shift is:

[0034] Δλ B =(1-P e )ελ B (2)

[0035] Equation (2) is the stress sensing model of FBG, where P e is the effective elasto-optic coefficient, which can be obtained from the fiber parameters, and ε is the axial...

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Abstract

The invention discloses a method for measuring the stress and strain of the gear root of the fixed center gear of a planetary gear train. The method of the invention comprises the following steps that: a fiber Bragg grating probe is mounted at a rounded angle of the gear root of the fixed center gear of the planetary gear train and is made to be located in a safe area, namely at a clearance where two gears are engaged with each other, and an included angle between the fiber Bragg grating probe and the axis of the gear is theta, and one end of the fiber Bragg grating probe is located at the gear root, and the other end of the fiber Bragg grating probe does not exceed the safe area, and O is a measurement point; and a fiber Bragg grating measurement system is utilized to measure the Prague wavelength lambda B of a grating when the gear is not loaded, and measures the Prague wavelength lambda' B of the fiber bragg grating after the gear is deformed, and the axial strain of the fiber bragg grating at the measurement point and the strain along the radial direction of the gear at the measurement point can be obtained according to a stress sensing model; and finally, a stress sigma at the measurement point along the radial direction of the gear can be calculated by using a basic formula of mechanics of materials sigma y=E epsilon y.

Description

technical field [0001] The invention relates to a dynamic test and fault diagnosis technology of a mechanical rotating device, in particular to a method for measuring transmission performance of a fixed sun gear of a planetary gear train. Background technique [0002] Gears are generally designed according to the rated load, but in fact, due to manufacturing errors, elastic deformation of parts such as gear teeth and shafts, vibration, etc., the gear tooth root generates a large additional dynamic stress. If the peak value of this dynamic bending stress exceeds If the fatigue limit of the gear teeth is exceeded, fatigue cracks will occur in the tooth roots. As the fatigue cracks continue to expand, the teeth will eventually break, which is one of the main forms of gear damage. In addition, this dynamic stress will also produce harmful vibration and noise, which will affect the transmission accuracy and reduce work efficiency. In order to analyze the strength characteristics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02G01M13/02
Inventor 张小栋牛杭张琦谢思莹
Owner XI AN JIAOTONG UNIV
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