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A Method for Timing Vibration Measurement of Unbonded Phase Blade Tip Based on Moving Straight Line Fitting

A technology of blade tip timing and straight line fitting, which is used in vibration testing, machine/structural component testing, measuring devices, etc. Reliability, effect of reducing impact

Active Publication Date: 2022-03-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of insufficient timing of blade tip and low measurement accuracy of the bonded phase method, the present invention proposes a method for measuring vibration of a blade tip without a bonded phase by fitting a moving straight line

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  • A Method for Timing Vibration Measurement of Unbonded Phase Blade Tip Based on Moving Straight Line Fitting
  • A Method for Timing Vibration Measurement of Unbonded Phase Blade Tip Based on Moving Straight Line Fitting
  • A Method for Timing Vibration Measurement of Unbonded Phase Blade Tip Based on Moving Straight Line Fitting

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Embodiment Construction

[0051] The following is a detailed description of the embodiments of the present invention in combination with technical solutions and accompanying drawings. The data of the embodiment comes from the blade tip timing vibration measurement test bench. The blade tip timing test bench is mainly composed of a driving motor, a blisk and a protective cover with magnet excitation. The blisk is directly installed on the output shaft of the motor. The number of blades is 32. The rated operating speed of the motor is 12000rpm. Realize variable speed sweep and constant speed operating conditions. The blade tip timing vibration measurement system is mainly composed of optical fiber sensor, Hall sensor, photoelectric pre-amplifier, signal conditioning module, counter and acquisition and processing program developed based on LabVIEW.

[0052] Step 1: Calculate the angle between adjacent blades and establish the standard order of blades.

[0053] Remove the magnet excitation on the protect...

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Abstract

The invention provides a method for timing vibration measurement of a keyless phase blade tip fitted with a moving straight line, and belongs to the technical field of vibration measurement of a keyless phase blade of a rotating machine. The present invention comprises the following steps: first, under the calibration working condition, randomly select a set of data to obtain the included angle of the adjacent blades and establish the standard sequence of the blades; then, under the calibration working condition, calibrate the adjacent blades measured by each channel Angle and identification of the blade sequence measured by each channel; finally, under the experimental conditions, first identify the blade sequence measured by each channel, and then use the moving straight line fitting method to obtain the optimal reference time for calculating the vibration of each blade. Thus further calculating the vibration displacement of the blade. By comparing with the calculation results of the bonded phase method, the present invention can completely replace the bonded phase method for blade vibration measurement, and the measurement accuracy is higher.

Description

technical field [0001] The invention belongs to the technical field of vibration measurement of high-speed rotating blades, in particular to a key-phase-free blade vibration measurement method based on blade tip timing technology. Background technique [0002] When the high-speed rotating blade is working, the blade will vibrate due to factors such as unstable airflow load, centrifugal force and rotor imbalance. The vibration of the blade will lead to high cycle fatigue (HCF), HCF will cause the blade to fail, reduce the durability and life of the blade, cause the blade to fall off, crack and break, and even cause serious safety accidents. Therefore, vibration monitoring and early warning of blade failures are crucial to the safe operation of rotating machinery units. Since the 1960s, in order to improve the vibration measurement system of rotating blades and meet the needs of high-speed rotating machinery and high-precision blade vibration measurement, non-contact blade vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00G01M7/02
CPCG01H17/00G01M7/025
Inventor 李宏坤范振芳董剑男赵新维
Owner DALIAN UNIV OF TECH