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Wear debris sensor sensitivity increasing method based on combination of band-pass filtering and correlation operation

A technology of wear sensor and band-pass filter, which is applied in the direction of instruments and analytical materials, and can solve problems such as the inapplicability of simple correlation calculations, the weakening of interference elimination effects, and the robustness of parameters.

Inactive Publication Date: 2015-07-22
BEIHANG UNIV
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Problems solved by technology

However, these methods have parameter robustness and convergence problems, especially when the interference frequency is very close to the signal level, the effect of interference cancellation will be greatly weakened
Correlation operation is an effective way to suppress random noise in periodic signals[15]. However, the wear particle signal is a short-period signal and is interfered by a specific frequency, so simple correlation operation is not applicable

Method used

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  • Wear debris sensor sensitivity increasing method based on combination of band-pass filtering and correlation operation
  • Wear debris sensor sensitivity increasing method based on combination of band-pass filtering and correlation operation
  • Wear debris sensor sensitivity increasing method based on combination of band-pass filtering and correlation operation

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[0102] In order to verify the performance of the band-pass correlation method under actual interference, the output signal of the sensor when no abrasive particles pass and the waveform of the simulated abrasive particle signal are superimposed as the sensor output. Figure 5 is the actual interference waveform and the FFT result. It is obvious that the actual interference is also composed of random noise and interference of specific frequency, and the large amplitude at some frequency in the frequency spectrum is caused by alternating current and vibration. Since the maximum amplitude of the actual interference is 0.02 near the frequency of 100Hz, the amplitude A of the abrasive particle signal is respectively 0.002, 0.005, 0.01, 0.02, and 0.04 for comparison. The results are as follows Figure 6 shown. The results show that when A≥0.01, the threshold method can effectively monitor the wear particles, so the effect of the bandpass correlation method in the actual interferenc...

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Abstract

The invention discloses a wear debris sensor sensitivity increasing method based on combination of band-pass filtering and correlation operation to increase the signal sensitivity of existing wear debris sensors. On the basis of the existing inductive wear debris sensors, two sensors are connected in series and mounted in an oil pipeline, and the sensitivity of acquired signals of the two sensors can be increased by 2.76 times with the method, so that smaller wear debris can be detected, and the method is applied to failure diagnosis based on wear debris information.

Description

technical field [0001] The invention belongs to the technical field of mechanical system state monitoring, fault diagnosis and life prediction, and in particular relates to a method for improving the sensitivity of a wear particle sensor based on the combination of band-pass filtering and correlation calculation. Background technique [0002] With the increasing complexity and precision of mechanical systems, real-time monitoring is of great significance to the reliable operation of machinery [1]. As a direct monitoring method, wear particle detection is based on monitoring the quantity, size and material of pollutants in the oil to monitor the mechanical state, and it can easily track and find mechanical failures [2]. Due to its simple structure and its sensitivity to oil quality, inductive wear particle detection is currently the most practical online wear particle monitoring method. The principle is that when metal abrasive particles pass through the sensor, it will caus...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00
Inventor 王少萍洪葳刘浩阔石健
Owner BEIHANG UNIV
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