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An Adaptive Threshold Adjustment Method

A technology of adaptive threshold and adjustment method, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of equipment false alarm vibration, missed alarm vibration, high threshold value, etc., to achieve good versatility and eliminate false alarms. The effect of judgment and improvement of accuracy

Active Publication Date: 2019-05-28
GUANGZHOU JIESHENG INFORMATION TECH
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Problems solved by technology

However, when the natural vibration amplitude of the equipment changes due to some reasons, such as loose foundation, motor aging, and mode changes, the traditional fixed threshold method cannot adapt to this change well: the threshold is too low, Causes the equipment to frequently falsely report vibration; the threshold is too high, resulting in insufficient sensitivity to vibration and missing vibration

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  • An Adaptive Threshold Adjustment Method
  • An Adaptive Threshold Adjustment Method
  • An Adaptive Threshold Adjustment Method

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Embodiment Construction

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0027] For any object, its instantaneous acceleration value a[t], where t is a certain instant time point.

[0028] When the system continuously collects and captures the acceleration value of the device at a certain sampling frequency through the 3D acceleration sensor, a discrete sequence of acceleration values ​​a[n] can be obtained, where n is the discrete time point of the collected data. Under normal conditions, the device vibrates at a natural frequency a s [n] Go to work. When additional vibration occurs, the vibration will generate an additional superimposed acceleration a to the equipment 螖 [n]. The detected vibration value at this time is:

[0029] a[n]=a s [n]+a 螖 [n]

[0030...

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Abstract

The invention discloses a self-adaptive threshold value adjusting method. The self-adaptive threshold adjusting method comprises the following steps: determining a threshold value dynamically by calculating inherent vibration energy and bottom noise of equipment in order to adapt to the change of the equipment; judging whether a mean value of vibration energy intervals is larger than twice of the dynamic threshold value or not, wherein a different value between a moment at which the mean value of the vibration energy intervals is larger than twice of the dynamic threshold value and a moment at which the mean value of the vibration energy intervals is smaller than or equal to twice of the dynamic threshold value is taken as abnormal vibration duration; detecting whether the abnormal vibration duration is less than a set value T or not; and eliminating wrong reporting about the vibration caused by state change of the equipment. Through adoption of the self-adaptive threshold value adjusting method, self-adaptive vibration detection is performed in a learning way, so that the accuracy of vibration detection is increased effectively, and misjudgment caused by state change of a system is eliminated effectively.

Description

technical field [0001] The invention relates to the field of vibration detection, in particular to an adaptive threshold adjustment method. Background technique [0002] At present, many devices are required to have a vibration detection function to determine whether there is an external force acting on the device. Existing vibration detection adopts a detection method based on a fixed threshold, that is, when the amplitude or energy of the vibration exceeds a set threshold, the vibration is detected. However, when the natural vibration amplitude of the equipment changes due to some reasons, such as loose foundation, motor aging, and mode changes, the traditional fixed threshold method cannot adapt to this change well: the threshold is too low, The device frequently falsely reports vibration; the threshold is too high, resulting in insufficient sensitivity to vibration and missing vibration. Contents of the invention [0003] The purpose of the present invention is to so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
CPCG01H17/00G16Z99/00
Inventor 刘琰黄灼黄锡雄黄明
Owner GUANGZHOU JIESHENG INFORMATION TECH
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