Unlock instant, AI-driven research and patent intelligence for your innovation.

Risk assessment model of petrochemical device maintenance

A risk assessment model, petrochemical technology, applied in the field of safety engineering, can solve the problems of difficult implementation and low assessment accuracy

Inactive Publication Date: 2017-07-14
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The risk assessment of petrochemical plant maintenance has nonlinear characteristics. Traditional assessment methods, such as analytic hierarchy process, fuzzy comprehensive evaluation method, gray system theory, etc., have the defects of difficulty in implementation and low assessment accuracy.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Risk assessment model of petrochemical device maintenance
  • Risk assessment model of petrochemical device maintenance
  • Risk assessment model of petrochemical device maintenance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] 1 Basic theory of curvelet transform

[0042] The curvelet transform was first proposed by the scientist Donoho. It is an anisotropic multi-scale and multi-directional expression. transform.

[0043] In two-dimensional space R 2 , define the spatial position parameter as s, define the frequency domain parameter as ω, and define the polar coordinates of the frequency domain as r and θ respectively, assuming that there are smooth, non-negative and real window W(r) and angle window V(t ), and satisfy the following conditions:

[0044]

[0045]

[0046] Define the scale parameter of the curvelet transform as 2 -j , rotation angle sequence θ j，l The expression for is as follows:

[0047]

[0048] sequence of positional arguments The expression for is as follows:

[0049]

[0050] The expression of the curvelet function is as follows:

[0051]

[0052] In the formula, is the angle θ j，l The rotation matrix of .

[0053] The expression of the contin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a risk assessment model of petrochemical device maintenance. The risk assessment model has a five-layer structure including a curvelet transform layer, a fuzzification layer, a fuzzy association layer, an after fuzzification association layer and an output layer. A curvelet neural network is constructed by combining curvelet transform and an artificial neural network based on the basic principle of a wavelet neural network. The curvelet finite element has the scale and location path channel of the conventional wavelet neural network and also has directivity so that a more complex decision surface can be constructed by the curvelet neural network, and thus a high-performance network model can be obtained. Besides, the fuzzy theory is integrated in the curvelet neural network to construct a fuzzy curvelet neural network so as to better describe the fuzziness and the uncertainty of petrochemical device maintenance risk factors.

Description

technical field [0001] The invention relates to a risk assessment model for maintenance of petrochemical equipment, which belongs to the technical field of safety engineering. Background technique [0002] The maintenance of petrochemical equipment has the characteristics of many cross operations, short maintenance period, many maintenance contents and complicated maintenance personnel. The quality of maintenance directly determines the failure rate of petrochemical enterprises. Due to the serious level of maintenance of petrochemical equipment It can improve the reliability of petrochemical equipment, ensure the safe operation of petrochemical equipment, and put forward higher requirements for the maintenance of petrochemical equipment. The number of petrochemical installations is increasing, and the contradiction between heavy maintenance workload and insufficient maintenance resources is becoming more and more prominent. Therefore, the risk assessment of petrochemical equ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06Q10/06G06N3/00
CPCG06Q10/0635G06N3/006
Inventor 赵斌韩帅王永祥李敬红曲永健
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY