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CN-121982845-A - A close alarm system for automatic automatically controlled cabinet protection

CN121982845ACN 121982845 ACN121982845 ACN 121982845ACN-121982845-A

Abstract

The present invention relates to the field of safety protection technology for automated electrical control cabinets, specifically, to a proximity alarm system for automated electrical control cabinet protection, aimed at solving the problem of traditional triggering alarms only based on distance thresholds, easily mistaking accidental passing and non threatening shaking of personnel as dangerous behavior, resulting in frequent ineffective alarms. In the present invention, the data acquisition unit uses a laser radar to continuously collect the distance between personnel and the electrical control cabinet and generate a time series. The behavior analysis unit analyzes and identifies stable residence windows through sliding windows, determines orientation features, backtracks historical window openings to calculate slopes and mark proximity trends. The state management unit maintains the behavior state machine, and only triggers alarms when personnel are in a stable orientation state and have a continuous duration of time, and there is a proximity trend before, reducing false alarm rates, Improve the safety and reliability of electrical control cabinets.

Inventors

  • LIN KAI
  • LI JING

Assignees

  • 福建研宇自动化科技有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (10)

  1. 1. The approach alarm system for the protection of the automatic electric control cabinet is characterized by comprising a data acquisition unit (1), a behavior analysis unit (2), a state management unit (3) and an alarm triggering unit (4); the data acquisition unit (1) continuously acquires real-time distance values between personnel and the front surface of the electric control cabinet at a preset sampling frequency, generates a distance time sequence and transmits the distance time sequence to the behavior analysis unit (2); The behavior analysis unit (2) performs sliding window piecewise analysis on the distance time sequence, calculates standard deviation of distance values in sliding windows for each sliding window, marks the window as a stable residence window when the standard deviation is smaller than a preset stability threshold value and the window duration exceeds a first preset duration, calculates local fluctuation variance of the distance values in the stable residence window, marks the current state as a gesture-oriented feature when the local fluctuation variance is smaller than a preset gesture variance threshold value, or marks the current state as a non-gesture-oriented feature, and simultaneously, the behavior analysis unit (2) backtracks a section of preset history window before the starting moment of the stable residence window, calculates linear regression slope of the distance values in the preset history window to time, and marks the current state as a approaching trend feature when the linear regression slope is negative and the absolute value is larger than a preset approaching slope threshold value; The state management unit (3) maintains a behavior state machine comprising a moving state, a stable facing state and a stable non-facing state, performs state switching and maintaining according to a marking result, generates an alarm trigger signal if and only if the duration time of the stable facing state and the stable facing state exceeds a second preset duration time and the approaching trend characteristic exists before the stable facing state, and outputs the alarm trigger signal to the alarm trigger unit (4).
  2. 2. The proximity alarm system for the protection of an automatic electric control cabinet according to claim 1, wherein the data acquisition unit (1) continuously transmits laser to a sector area right in front of the electric control cabinet and receives a reflected signal thereof by adopting a laser radar ranging sensor at a preset sampling frequency, calculates real-time distance values between personnel and the front of the electric control cabinet by measuring laser flight time, packages each real-time distance value together with a corresponding timestamp, generates and sequentially arranges the real-time distance values to form the distance time sequence, and transmits the distance time sequence to the behavior analysis unit (2).
  3. 3. The approach alarm system for automatic electric control cabinet protection according to claim 1, wherein when the behavior analysis unit (2) performs sliding window segmentation analysis on the distance time sequence, a first sliding window with a fixed time length is adopted, the first sliding window is sequentially slid forward along a time axis according to a preset sliding step length, after each sliding, all distance values falling into a new first sliding window time range are used as one data segment for subsequent analysis, and the data segments corresponding to adjacent first sliding windows are partially overlapped in time.
  4. 4. The approach alarm system for automatic electric control cabinet protection according to claim 3, wherein the behavior analysis unit (2) calculates standard deviations of all distance values in the data segments for the data segments corresponding to each first sliding window, compares the standard deviations with a preset stability threshold, judges whether the duration of the first sliding window exceeds a first preset duration, and marks the whole time period covered by the current first sliding window as a stable residence window for identifying the time period of relatively stationary residence of a person when the standard deviations are smaller than the stability threshold and the duration of the first sliding window exceeds the first preset duration.
  5. 5. The approach alarm system for automatic electric control cabinet protection according to claim 4, wherein in the identified stable residence window, the behavior analysis unit (2) further adopts a second sliding window with a time length smaller than that of the stable residence window, the second sliding window slides in the stable residence window, for each residence position of the second sliding window in the stable residence window, the variance of the distance value covered by the second sliding window at the residence position is calculated, a plurality of local fluctuation variances are obtained, an average value of the local fluctuation variances is calculated as a final local fluctuation variance representing the stable residence window, and if the final local fluctuation variance is smaller than a preset gesture variance threshold, the behavior state corresponding to the current stable residence window is marked as a gesture-oriented feature.
  6. 6. The proximity alarm system for automatic electric cabinet protection according to claim 5, wherein if the final local fluctuation variance calculated in the stable residence window is greater than or equal to a preset gesture variance threshold, it indicates that there is non-frontal body shake of the person during residence, and the behavior analysis unit (2) marks the behavior state corresponding to the current stable residence window as a non-orientation feature.
  7. 7. The proximity alarm system for automatic electric control cabinet protection according to claim 6, wherein after the behavior analysis unit (2) marks a stable residence window, backtracking a continuous time period before the starting time of the stable residence window, defining the continuous time period as a preset history window, extracting all time-ordered distance values in the preset history window, and calculating a linear regression slope describing the time-varying speed and direction of the distance by fitting a linear trend of the time-varying distance value by a least square method.
  8. 8. The proximity alarm system for automatic electric control cabinet protection according to claim 7, wherein the behavior analysis unit (2) judges a value of a calculated linear regression slope, and if the linear regression slope is negative and the absolute value is larger than a preset proximity slope threshold, the behavior analysis unit (2) marks the situation as a proximity trend feature, indicating that a distance between a person and the front surface of the electric control cabinet is shortened before entering a stable resident state.
  9. 9. The proximity alarm system for automatic electric control cabinet protection according to claim 8, wherein the behavior state machine maintained by the state management unit (3) comprises three states of a moving state, a stable facing state and a stable non-facing state; The behavior analysis unit (2) transmits marked gesture-oriented features, non-gesture-oriented features and approaching trend features to the state management unit (3), and the state management unit (3) drives the behavior state machine to perform state switching and maintaining according to the received marking result, specifically: If no stable resident window is identified, the behavior state machine is switched to a moving state, when the stable resident window is identified and the gesture-oriented feature mark is received, the behavior state machine is switched to a stable facing state, when the stable resident window is identified and the gesture-non-oriented feature mark is received, the behavior state machine is switched to a stable non-facing state, and in the state switching and maintaining process, the state management unit (3) records the duration of the current state and stores whether the approaching trend feature mark sent by the behavior analysis unit (2) exists before entering the current stable facing state.
  10. 10. The proximity alarm system for automatic electronic control cabinet protection according to claim 8, wherein the state management unit (3) continuously judges whether two conditions are simultaneously satisfied when the behavior state machine is in a stable facing state, wherein: The first condition is whether the duration of the current steady facing state exceeds a second preset duration, the second condition is whether a proximity trend feature flag is stored before entering this steady facing state, and if and only if both conditions are met at the same time, the state management unit (3) generates a final alarm trigger signal and outputs the alarm trigger signal to the alarm trigger unit (4).

Description

A close alarm system for automatic automatically controlled cabinet protection Technical Field The invention relates to the technical field of safety protection of automatic electric control cabinets, in particular to a proximity alarm system for protection of an automatic electric control cabinet. Background The automatic electric control cabinet safety protection is an important technology, is particularly applied to a real-time early warning link of unauthorized approaching of an industrial field electric control cabinet, and is characterized in that the alarm accuracy is improved through behavioral characteristic analysis, the reliability requirement of the electric control cabinet safety protection is met, the industrial field adopts a judgment mode that a distance threshold value is directly triggered for personnel approaching early warning of the electric control cabinet, and because the judgment mode is only based on real-time distance values, comprehensive recognition cannot be carried out by combining the resident state, facing posture and moving trend of personnel, so that the personnel can be misjudged as illegal approaching by accident passing, in-situ non-threat shaking and other non-dangerous behaviors, a large number of invalid alarms are generated, the normal operation order of the field is influenced, the reliability of the safety protection early warning is reduced, the accurate early warning of the unauthorized approaching of the electric control cabinet is difficult to realize, and in order to solve the technical problem, the approaching alarm system for the automatic electric control cabinet protection is provided. Disclosure of Invention The invention aims to provide a proximity alarm system for protecting an automatic electric control cabinet, so as to solve the problems in the background technology. In order to achieve the aim, the approach alarm system for protecting the automatic electric control cabinet comprises a data acquisition unit, a behavior analysis unit, a state management unit and an alarm triggering unit; the data acquisition unit continuously acquires real-time distance values between personnel and the front surface of the electric control cabinet at a preset sampling frequency, generates a distance time sequence and transmits the distance time sequence to the behavior analysis unit; The behavior analysis unit analyzes the distance time sequence in a sliding window segment manner, calculates standard deviation of distance values in the sliding window for each sliding window, marks the window as a stable residence window when the standard deviation is smaller than a preset stability threshold value and the window duration exceeds a first preset duration, calculates local fluctuation variance of the distance values in the stable residence window, marks the current state as a gesture-oriented feature when the local fluctuation variance is smaller than a preset gesture variance threshold value, or marks the current state as a non-gesture-oriented feature when the local fluctuation variance is smaller than a preset gesture variance threshold value, and simultaneously, the behavior analysis unit backtracks a section of preset history window before the starting moment of the stable residence window, calculates linear regression slope of the distance values in the preset history window with respect to time, and marks the window as a approaching trend feature when the linear regression slope is negative and the absolute value is larger than a preset approaching slope threshold value; The state management unit maintains a behavior state machine comprising a moving state, a stable facing state and a stable non-facing state, performs state switching and maintaining according to a marking result, generates an alarm trigger signal if and only if the duration of the stable facing state and the stable facing state exceeds a second preset duration and the approaching trend characteristic exists before the stable facing state, and outputs the alarm trigger signal to the alarm trigger unit. Compared with the prior art, the invention has the beneficial effects that: According to the invention, a mode of combining multi-window sliding detection, residence time judgment, gesture recognition and movement trend analysis is adopted, so that the traditional single-distance threshold triggering mode is replaced, unauthorized approaching and accidental passing and in-situ non-dangerous actions without threat shaking can be accurately distinguished, the false alarm rate is reduced, invalid alarms are prevented from interfering with normal operation order of an electric cabinet, the accuracy and reliability of personnel approaching alarm are improved, a double-threshold layered triggering mechanism is adopted, and the dynamic adjustment of judgment parameters by combining personnel behavior characteristics can be adopted, so that the scene adaptability and robustness of a system are improved, unau