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Monitor Engine Components

An engine and rotary engine technology, which is used in the testing of mechanical parts, the testing of machine/structural components, and the testing of machine gears/transmission mechanisms. Increased resolution, improved overall diagnostics

Active Publication Date: 2017-12-12
OXFORD UNIV INNOVATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relative displacement measurements are not as sensitive to many faults that are initially at high frequencies and are usually masked by background noise
This makes it difficult to detect wear faults such as tiny and large pits in gear teeth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0081]A small trial was performed to evaluate the use of embedded eddy current sensors for monitoring gear and damage detection applications. A simplified gearbox test setup is built using two rotating shafts to mount a mating pair of "spur" gears. The main drive gear is mounted to the output shaft of the motor. A secondary monitor gear is mounted to the drive shaft feeding the electric motor acting as a reluctance brake to provide mechanical resistance to the drive shaft. Each axis is equipped with a precision optical axis encoder, which provides 500 pulses and 1 pulse per revolution.

[0082] The main gear is a steel gear with 25 teeth. The secondary monitor gear is a plastic gear with 24 teeth, allowing rolling scanning of all 25 teeth of the primary gear over the course of 25 revolutions. The secondary monitoring gear has ferrite core eddy current sensors embedded in the teeth. Figures 12a-12c Eddy current sensors in different teeth are shown. exist Figure 12a and ...

example 2

[0086] In addition to the budding failure detected in Example 1, another gear that had previously been run on the gearbox test rig and had some galling damage on the gear teeth was tested. Mounted on the tooth surface (such as Figure 12a shown) is used to monitor the gear. Figure 14 Signals from the sensor are shown with output signal A for a damaged gear, and output signal B for a scuffed gear. The upper graph shows the sensor signal for a set of gear teeth showing signs of galling damage, while the lower graph is a zoomed-in view of the sensor signal from a single tooth. From the above graph it can be seen that for all teeth shown, the magnitude of the scuffed gear is reduced relative to the healthy gear. This is due to the increased distance between the sensor and the tooth surface as the surface wears due to scuffing. As can be seen from the figure below, the output signal not only decreases in amplitude, but also changes in shape. This indicates that the gears are n...

example 3

[0088] By way of comparison, the misalignment test is carried out using the same gear box test device. The main gear was first tested for optimal alignment, and then the gear was tested with a small radial offset (200 μm) implemented by modifying the relative radial position of the gears. from mounting on the tooth surface (see Figure 12a ) is used to monitor the gear and the result is displayed in Figure 15 middle. Output signal A is for aligned gears, compared to output signal B measured after misalignment. It can be seen that there is a significant change in amplitude due to misalignment changing the distance between the teeth of the main gear and the sensor. However, the shape of the output signal from the sensor has not changed. Thus, misalignment problems can be distinguished from localized faults such as cracks or depressions in gear teeth.

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PUM

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Abstract

A method of monitoring localized faults in a rotating engine component, such as a gear (24), using one or more eddy current sensors (14) arranged to follow the rotation and rotation of the engine component (24) during operation. Engine components (24) interact. The eddy current sensor (14) may be carried by one or more teeth (16) of the monitoring gear (26). The device (28) is arranged to measure an output signal from the eddy current sensor (14) resulting from interaction with a rotating engine component (24). The output signal is processed to detect a change in shape of the output signal indicative of a localized fault.

Description

technical field [0001] The present invention relates to monitoring engine components, and more particularly to monitoring the health of rotating components in an engine such as gears, rotors, shafts, and even blades. Background technique [0002] The purpose of engine monitoring systems is to improve operational and maintenance efficiency by reducing or eliminating component failures and unplanned downtime. Monitoring the health of a gearbox is critical for many applications. As one example, in the wind energy industry, although the failure rate of gearboxes is lower than that of certain other wind turbine components, the resulting downtime is longer. Repairing and / or replacing gearboxes for off-shore wind turbines can be particularly time consuming. For wind turbines and other applications, the cost of this downtime, as well as the cost of repair and replacement parts, is an important one among the goals of improving gearbox monitoring. For example, gearbox and rotor fai...

Claims

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Application Information

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IPC IPC(8): G01N27/90G01M13/02
CPCG01M13/021G01N27/9046G01N27/90
Inventor 噶玛吉·辛格·查纳
Owner OXFORD UNIV INNOVATION LTD