Method and apparatus for analyzing performance of a hydraulic pump
AssigneeThe Board of Trustees of the University of Illinois
InventorsQin Zhang, Yingjie Gao, Xiangdong Kong
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Abstract
A method and apparatus for analyzing a hydraulic pump in real-time. A pressure signal is provided representing a discharge pressure of the hydraulic pump, and the pressure signal is decomposed into a plurality of levels. Each of the plurality of levels has at least one frequency band. A feature pressure signal is located in at least one of the frequency bands and compared to a reference wavelet to determine if a fault exists in the hydraulic pump and/or a type of defect in the hydraulic pump.
Claims18
A method of analyzing a hydraulic pump in real-time, the method comprising:
- providing a pressure signal representing a discharge pressure of the hydraulic pump;
- decomposing the pressure signal into a plurality of levels, each of the plurality of levels having at least one frequency band;
- locating a feature pressure signal in at least one of the frequency bands;
- comparing the located feature pressure signal wavelet to a reference.
An apparatus for identifying a defect in a hydraulic system comprising:
- a pressure sensor in fluid communication with a discharge port of a hydraulic pump of the hydraulic system, the pressure sensor being configured to produce a pressure signal in response to a received pulsation discharge pressure;
- a processor coupled to the pressure sensor, the processor being configured to:
- receive the pressure signal;
- decompose the pressure signal into a plurality of levels, each of the plurality of levels having at least one frequency band;
- locate a feature pressure signal in at least one of the frequency bands;
- compare the located feature pressure signal to a reference wavelet.
A hydraulic system comprising:
- a hydraulic pump configured to distribute a fluid through at least one passage;
- a pressure sensor in fluid communication with a discharge port of a hydraulic pump of the hydraulic system, the pressure sensor being configured to produce a pressure signal in response to a received pulsation discharge pressure;
- a processor coupled to the pressure sensor, the processor being configured to:
- receive the pressure signal;
- decompose the pressure signal into a plurality of levels, each of the plurality of levels having at least one frequency band;
- locate a feature pressure signal in at least one of the frequency bands;
- compare the located feature pressure signal wavelet to a reference.
Dependencies are inferred from the claim text.