CN-122024393-A - Dynamic evaluation platform and method for electrical fire risks

CN122024393ACN 122024393 ACN122024393 ACN 122024393ACN-122024393-A

Abstract

The invention relates to the technical field of electric fire risk assessment and discloses an electric fire risk dynamic assessment platform and method, wherein the method comprises the steps of obtaining physical space metadata and maintenance task attributes of electric equipment to be assessed and generating a standard operation space-time envelope; collecting a data stream of a motion sensor of the patrol handheld terminal, and generating a real-time track empty pipe; the invention converts the space, time and action strength requirements of maintenance work into computable four-dimensional space-time geometrical entities and carries out Boolean intersection, thereby realizing quantitative evaluation on the substantivity and fineness of the maintenance work, effectively avoiding false maintenance phenomenon caused by NFC card punching, and improving the objectivity and accuracy of electric fire risk evaluation.

Inventors

XU LIANG
WU GAOHONG

Assignees

浙江方元安消防技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. A method for dynamically assessing risk of an electrical fire, the method comprising: acquiring physical space metadata and maintenance task attributes of the electrical equipment to be evaluated, constructing an effective operation cylinder based on the physical space metadata, generating a standard operation space-time envelope body by combining the maintenance task attributes and the effective operation cylinder, and calculating a standard space-time volume; Establishing an operation space-time coordinate system, collecting a motion sensor data stream of a patrol handheld terminal, calculating an instantaneous motion entropy value according to the motion sensor data stream, mapping the instantaneous motion entropy value into a dynamic track pipe diameter, and generating an actual measurement track space-time pipe in the operation space-time coordinate system by utilizing the dynamic track pipe diameter; And performing space-time Boolean intersection operation on the real-time track space-time tube and the standard operation space-time envelope body to obtain an effective coincident volume, calculating the ratio of the effective coincident volume to the standard space-time volume to obtain a quality-maintaining quantity index, generating a risk amplification coefficient according to the quality-maintaining quantity index, and correcting a basic physical risk index in physical space metadata by using the risk amplification coefficient to obtain a dynamic risk index after management and control.
2. The method for dynamically evaluating the risk of an electrical fire according to claim 1, wherein the physical space metadata comprises a physical center three-dimensional coordinate, a forward operation surface normal vector and a basic physical risk index, and the maintenance task attribute comprises a standard operation duration and a standard action feature type; and the maintenance task attribute is obtained by analyzing an electronic work order associated with the electrical equipment to be evaluated.
3. The electrical fire risk dynamic assessment method according to claim 2, wherein the construction method of the effective operation work cylinder comprises: And the physical center three-dimensional coordinate is translated outwards along the normal vector direction of the forward operation surface by a preset operation distance, then a projection point on the ground is taken as an axis projection point, the vertical axis direction is taken as the axis direction, and an effective operation cylinder of the electrical equipment to be evaluated is constructed in the three-dimensional virtual space according to the preset ergonomic radius and the effective operation height range.
4. The method of claim 3, wherein the standard job space-time envelope is generated by stretching an effective operation cylinder along a time axis to maintain a standard job duration in the task attribute, and wherein the standard job space-time envelope defines a space boundary with the effective operation cylinder and a time boundary with the standard job duration.
5. The method for dynamic assessment of electrical fire risk according to claim 4, wherein the method for calculating the standard spatiotemporal volume comprises: And matching a corresponding standard motion entropy value threshold from a preset database according to the standard motion characteristic type, and calculating a standard space-time volume according to the standard motion entropy value threshold and a preset pipe diameter increment coefficient.
6. The method for dynamically evaluating the risk of an electrical fire according to claim 5, wherein the method for establishing the operation space-time coordinate system comprises the steps of: And locking the current timestamp as the operation starting time and setting the operation starting time as a time coordinate origin, setting the axis projection point of the effective operation cylinder as a space coordinate origin, and establishing an operation space-time coordinate system consisting of three-dimensional space coordinates and one-dimensional time coordinates.
7. The method of claim 6, wherein the motion sensor data stream comprises an instantaneous acceleration vector, an instantaneous angular velocity vector, and an instantaneous three-dimensional displacement coordinate for each time slice; The calculation method of the instantaneous action entropy value comprises the steps of calculating the variance and the zero crossing rate of an instantaneous angular velocity vector of each time slice in a motion sensor data stream, and carrying out weighted fusion on the variance and the zero crossing rate to generate the instantaneous action entropy value of the time slice.
8. The method for dynamically evaluating the risk of an electrical fire according to claim 7, wherein the method for generating the hollow tube for actually measuring the trajectory comprises: And performing time normalization processing on the motion sensor data stream, and connecting instantaneous three-dimensional displacement coordinates of all time slices in the motion sensor data stream subjected to the normalization processing in time sequence in an operation space-time coordinate system to form a track center skeleton line, and performing three-dimensional sweep modeling on the track center skeleton line along the dynamic track pipe diameters of the corresponding time slices to generate a real-time track time blank pipe.
9. The electrical fire risk dynamic assessment method according to claim 8, wherein the effective coincidence volume acquisition method comprises: And placing the standard operation space-time envelope body and the actual measurement track space-time tube into an operation space-time coordinate system, executing space-time Boolean intersection operation in the operation space-time coordinate system, judging whether a track center skeleton line sampling point of the actual measurement track space-time envelope body is positioned in a space boundary of an effective operation cylinder or not every moment, and calculating the volume of a part of the actual measurement track space-time envelope body, which is positioned in an effective space-time range defined by the standard operation space-time envelope body, as an effective superposition volume only when the sampling point is positioned in the space boundary and the moment corresponding to the sampling point is positioned in the standard operation time duration range.
10. An electrical fire risk dynamic assessment platform for implementing the electrical fire risk dynamic assessment method according to any one of claims 1-9, characterized in that the platform comprises: The standard envelope construction module is used for acquiring physical space metadata and maintenance task attributes of the electrical equipment to be evaluated, constructing an effective operation cylinder based on the physical space metadata, generating a standard operation space-time envelope body by combining the maintenance task attributes and the effective operation cylinder, and calculating a standard space-time volume; The real-time space tube generation module is used for establishing an operation space-time coordinate system, collecting a motion sensor data stream of the inspection handheld terminal, calculating an instantaneous motion entropy value according to the motion sensor data stream and mapping the instantaneous motion entropy value into a dynamic track tube diameter, and generating a real-time track space tube in the operation space-time coordinate system by utilizing the dynamic track tube diameter; The dynamic risk assessment module is used for carrying out space-time Boolean intersection operation on the real-time track space-time tube and the standard operation space-time envelope body to obtain an effective coincidence volume, calculating the ratio of the effective coincidence volume to the standard space-time volume to obtain a quality maintenance quantity index, generating a risk amplification coefficient according to the quality maintenance quantity index, and correcting the basic physical risk index in the physical space metadata by using the risk amplification coefficient to obtain a controlled dynamic risk index.

Description

Dynamic evaluation platform and method for electrical fire risks Technical Field The invention relates to the technical field of electric fire risk assessment, in particular to an electric fire risk dynamic assessment platform and an electric fire risk dynamic assessment method. Background With the increasing number of large commercial complexes, industrial parks and high-rise buildings, the number of electrical equipment grows exponentially, and electrical fires have become one of the major disaster types threatening public safety. In order to prevent such risks, regular manual inspection and maintenance are commonly adopted in the industry as a nuclear management and control means, and a risk assessment model is used for quantifying the safety state of equipment. The current electrical fire risk assessment technology is mainly focused on the construction of an assessment index system and the research of an optimization algorithm of weight. For example, chinese patent application CN114282849a discloses a fire risk assessment method for high-rise buildings, which focuses on the mining and quantification of an index system, screens assessment indexes through FP-Growth algorithm, combines an improved DEMATEL-ANP method to determine weights, and uses a cloud theoretical model to process ambiguity of the indexes, so as to solve the problem of assessment distortion caused by complex relevance between assessment indexes. For another example, chinese patent application CN114021915A discloses an electrical fire risk assessment method based on improved equalization weight and variable fuzzy set, which introduces a variable weight comprehensive theory based on equalization function, dynamically adjusts weight according to real-time scoring of indexes, and prevents individual serious hidden trouble from being "neutralized" by other good indexes, thereby improving sensitivity of assessment result to extreme risk. The prior art has remarkable progress in the aspects of constructing a static risk model and optimizing calculation logic, and can accurately reflect the electric fire risk level on the premise that input data are true and effective. However, the risk assessment method has the defect in practical application that the assessment logic is built on the assumption that the maintenance record truly reflects the maintenance effectiveness, and verification of the authenticity and the effectiveness of the maintenance process data is lacked. In the existing outsourcing maintenance mode, a widely adopted Near Field Communication (NFC) card punching or Global Positioning System (GPS) positioning technology can only prove that a maintainer reaches a specified device position at a specific moment, but cannot prove whether the maintainer performs maintenance actions conforming to specifications or not. The position confirmation mode based on the discrete time stamp cannot record the space behavior track and the limb action intensity of maintenance personnel after punching cards. When a maintainer leaves immediately after performing the punching or only resides beside the equipment without performing false maintenance actions such as substantial operation, the existing evaluation system often misjudges that the equipment is effectively maintained according to the punching record, and then calculates a lower risk index through a model. The serious deviation between the calculated risk value and the actual physical risk value of the equipment causes the electrical equipment to run with diseases under the condition of long-term lack of substantial maintenance, but the evaluation system cannot identify the artificial potential safety hazard generated by the operation, and finally causes the fire accident to occur in the error area which is judged to be low in risk due to the compliance of maintenance. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides the dynamic evaluation platform and the dynamic evaluation method for the electrical fire risk, and the false maintenance behavior is identified in the geometric dimension by constructing a standard operation space-time envelope body representing the standard operation requirement and a real-time empty pipe representing the actual operation behavior generated based on the motion sensor data and precisely quantifying the effective operation space-time volume of maintenance personnel by utilizing space-time boolean intersection operation. The invention can quantify the effectiveness of maintenance action into the risk amplification coefficient, correct the basic physical risk index of the equipment in real time, and effectively solve the technical problem that the risk assessment result is distorted due to the fact that the false maintenance action cannot be identified in the traditional assessment method. In order to achieve the above purpose, the present invention provides the following technical solutions: the dynamic assessment metho