Online denoising method for liquid pressure sensor system based on hidden Markov model

A liquid pressure and sensor technology, which is used in the measurement of fluid pressure, instruments, and complex mathematical operations. The effect of small measurement errors

Inactive Publication Date: 2020-06-09
TIANJIN UNIV
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Problems solved by technology

Liquid pressure sensor performance is limited by the system noise and measurement noise of the liquid pressure sensor system

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  • Online denoising method for liquid pressure sensor system based on hidden Markov model
  • Online denoising method for liquid pressure sensor system based on hidden Markov model
  • Online denoising method for liquid pressure sensor system based on hidden Markov model

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Embodiment Construction

[0049] The online denoising method of the liquid pressure sensor system based on the hidden Markov model of the present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0050] In the online denoising method of the liquid pressure sensor system based on the hidden Markov model of the present invention, the adopted liquid pressure sensor system is such as figure 1 As shown, the hydraulic pressure sensor utilizes radio frequency identification technology and adopts a dual tag coupling design. The two labels are respectively fixed on the piston and the cylinder wall by fixing glue, and are within the working range of the reader. Among them, the tag adopts a commercial chip with an adaptive impedance matching capacitor, and the reader can indicate the matching capacitor (C) of the tag, and the distance (d) between the matching capacitor (C) and the two tags satisfies C=k / d+ b, where k, b are constants. When the cylinder ...

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Abstract

The invention discloses an online denoising method for a liquid pressure sensor system based on a hidden Markov model. The online denoising method comprises steps of respectively initializing a hiddenstate and an observation state of the hidden Markov model and the liquid pressure sensor system; establishing the hidden Markov model; predicting the hidden state according to the hidden Markov model; obtaining optimal estimation of the hidden state according to the prediction result of the hidden state, and thereby achieving online denoising of the liquid pressure sensor system. The liquid pressure sensor system online denoising method based on the hidden Markov model is advantaged in that real-time performance and high efficiency of the HMM are fully utilized, a state of a hydraulic sensoris reasonably predicted, and measurement precision of the sensor is improved.

Description

technical field [0001] The invention relates to an online denoising method. In particular, it relates to an online denoising method for a liquid pressure sensor system based on a hidden Markov model. Background technique [0002] With the acceleration of the industrialization process, the demand for liquid pressure sensors has increased sharply, and at the same time, higher requirements have been put forward for the measurement accuracy of the sensors. All kinds of mechanical equipment need continuous energy supply, so the liquid pressure in the cylinder is an important indicator to ensure the normal operation of the equipment. [0003] Among the currently proposed liquid pressure measurement instruments, some experts have proposed a new type of optical fiber liquid crystal sensor for static pressure monitoring; some have also designed a liquid pressure optical fiber sensing system using a polarization crosstalk analyzer, and verified its feasibility through water depth mea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L27/00G06F17/16
CPCG01L27/00G06F17/16
Inventor 冯人海常燕燕
Owner TIANJIN UNIV
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