Method for designing industrial alarm on basis of alarm evidence fusion

A technology of evidence fusion and design method, applied in the direction of alarms, instruments, etc., can solve the problems such as the inability to eliminate the uncertainty interference well, and the inability to completely effectively reduce the false alarm rate and the false alarm rate.

Active Publication Date: 2012-11-21
南京智慧水运科技有限公司
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Problems solved by technology

Several commonly used alarm design methods such as digital filtering, time delay, and dead zone setting have been given in the standards of the British Engineering Equipment and Materials Users Association, but the discrimination methods of these traditional methods are based on absolute thresholds, that is, process variables If the threshold is exceeded, the alarm will be issued immediatel

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  • Method for designing industrial alarm on basis of alarm evidence fusion
  • Method for designing industrial alarm on basis of alarm evidence fusion
  • Method for designing industrial alarm on basis of alarm evidence fusion

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Embodiment Construction

[0061] An industrial alarm design method based on alarm evidence fusion proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0062] (1) Set the identification frame of a device alarm as Θ={N,A}, where N (Normal) indicates that the device is in normal operation, and A (Abnormal) indicates that the device is in abnormal operation, that is, in an alarm state.

[0063] (2) Let x be the process variable that needs to be monitored by the device alarm, let x(k), k=1, 2, 3, ... be the online measurement sequence of the sensor for the process variable x, k is the sampling time, the number of samples It is determined by the monitoring period of the alarm and the storage space of the monitoring computer. Generally, the maximum value of k is greater than 2000. and are the minimum and maximum values ​​of x change respectively, define x tp is the certainty threshold, and has Construct the fuzzy thresholds of process variable...

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Abstract

The invention relates to a method for designing an industrial alarm on basis of alarm evidence fusion, which belongs to the technical field of industrial alarm design. The method is based on a fuzzy subjection function to construct a fuzzy threshold, the measured values of a process variable at each moment are compared with the fuzzy threshold to calculate an alarm evidence, and the alarm evidence shows the uncertainty degree that the value of the process variable exceeds or is lower than the fuzzy threshold; a linear weighting evidence is utilized to update rules, the alarm evidence of the current moment is fused with the alarm evidence in the past time, so the whole alarm evidence of the current moment is obtained, the alarm is judged to be sent out or not according to related judgment standards, the fusion process can effectively reduce the influence of uncertainty, so the alarm accuracy is improved; and a test sample is extracted according to the measured data of the process variable. A method for finding out the optimal fuzzy threshold under the lowest false alarm rate and missing report rate standards is provided.

Description

technical field [0001] The invention relates to an industrial alarm design method based on alarm evidence fusion filtering, and belongs to the technical field of industrial alarm design. Background technique [0002] In petrochemical and other industrial fields, the over-limit alarm of the main operating process variables of large-scale equipment is an important means to grasp the operation of the equipment and find out the abnormality or failure of the equipment in time. The alarm generated by the alarm can remind the equipment operator or maintenance personnel to take measures such as shutting down or degrading operation in time to ensure that the equipment is not subject to more serious damage. Whether the alarm will alarm or not depends on whether the monitored process variable triggers the set alarm threshold. However, in practical applications, when the alarm threshold is not designed properly, false positives or even alarm floods and missed negatives often occur. Th...

Claims

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Application Information

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IPC IPC(8): G08B21/18
Inventor 徐晓滨宋晓静文成林
Owner 南京智慧水运科技有限公司
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