CN113916358B - Escalator danger monitoring and responding method, device and equipment based on vibration signal analysis - Google Patents

Escalator danger monitoring and responding method, device and equipment based on vibration signal analysis Download PDF

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CN113916358B
CN113916358B CN202111084482.XA CN202111084482A CN113916358B CN 113916358 B CN113916358 B CN 113916358B CN 202111084482 A CN202111084482 A CN 202111084482A CN 113916358 B CN113916358 B CN 113916358B
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escalator
vibration signal
monitored
range threshold
time domain
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CN113916358A (en
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刘阳
房斌
韩雷
李春雨
宋佑举
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Qingdao Urban Rail Transit Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B29/00—Safety devices of escalators or moving walkways
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B29/00—Safety devices of escalators or moving walkways
    • B66B29/005—Applications of security monitors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies

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  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Escalators And Moving Walkways (AREA)

Abstract

The invention relates to an escalator danger monitoring and responding method based on vibration signal analysis, which comprises the steps of acquiring a first vibration signal to obtain a time domain range threshold value and a frequency domain range threshold value of escalator vibration to be monitored; acquiring a second vibration signal in real time to obtain a current time domain characteristic value and a current frequency domain characteristic value of the second vibration signal; judging whether the escalator to be monitored falls down according to the current time domain characteristic value and the time domain range threshold value, and judging whether the escalator to be monitored falls down by personnel according to the current frequency domain characteristic value and the frequency domain range threshold value. According to the invention, pattern recognition is carried out according to typical characteristics of vibration signals when articles fall and personnel fall, and an emergency disposal mechanism for dangerous situations of the escalator is comprehensively provided by combining with different characteristics of vertical distance, running time, installation position and the like of the escalator. The invention also relates to an escalator danger monitoring and responding device and equipment based on vibration signal analysis.

Description

Escalator danger monitoring and responding method, device and equipment based on vibration signal analysis
Technical Field
The invention relates to the technical field of escalator application safety, in particular to an escalator danger monitoring and responding method, device and equipment based on vibration signal analysis.
Background
An escalator is a stationary electrically driven device for transporting passengers by tilting up or down a circulating step. As a special transportation means for bearing the transfer function, the escalator has the characteristic of continuous operation for a long time. If accidents such as falling of articles or falling of personnel occur in the running process of the escalator, the mechanical structure of the escalator can cause continuous serious injury to the personnel. Therefore, the research on the escalator danger monitoring and response system has important significance for reducing the escalator artificial operation and maintenance cost and promoting the industry upgrading.
An escalator, which is a type of lifting device, generally has a high straight elevation. The common standards at home and abroad specify that the inclination angle of the escalator is generally not more than 30 degrees and is maximally not more than 35 degrees, so that the length of the escalator is generally more than twice the straight lifting height. When the pedestrian step ladder is built at equal lifting distance and height, the slow step platform can be built according to the building standard to improve the stability of the building structure, and meanwhile personal injury to people when falling down is reduced. The escalator mainly comprises steps, traction chains, chain wheels, a guide rail system, a main transmission system and an electric system, and a slow-walking platform is not designed due to the direct elevation and the length. The research of the home and abroad escalator detection system mainly focuses on detection of mechanical operation conditions such as the differential speed of handrail relative to step operation, the reliability of a brake and the like, and can not respond and alarm to dangerous situations of the escalator such as article falling, personnel falling and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an escalator danger monitoring and responding method, device and equipment based on vibration signal analysis.
The technical scheme for solving the technical problems is as follows:
an escalator hazard monitoring and response method based on vibration signal analysis, the method comprising:
acquiring a time domain range threshold value and a frequency domain range threshold value of the escalator vibration to be monitored according to a first vibration signal in the vertical direction of a step tread of the escalator to be monitored, wherein the first vibration signal is acquired by a data sampling equipment array arranged on the escalator to be monitored and used for normally working;
collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and carrying out Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal;
judging whether articles fall off the escalator to be monitored or not according to the current time domain characteristic value and the time domain range threshold value, and judging whether personnel fall off the escalator to be monitored or not according to the current frequency domain characteristic value and the frequency domain range threshold value;
when articles fall or personnel fall on the escalator to be monitored, an alarm is sent out and the personnel are reminded to avoid danger.
The method has the beneficial effects that: the invention provides an escalator danger monitoring and responding method based on vibration signal analysis, which comprises the steps of acquiring a first vibration signal in the vertical direction of a step tread of an escalator to be monitored through a data sampling equipment array arranged on the escalator to be monitored, and obtaining a time domain range threshold value and a frequency domain range threshold value of the escalator to be monitored vibration according to the first vibration signal; collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and performing Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal; judging whether the escalator to be monitored falls down according to the current time domain characteristic value and the time domain range threshold value, and judging whether the escalator to be monitored falls down by personnel according to the current frequency domain characteristic value and the frequency domain range threshold value; when articles fall or personnel fall on the escalator to be monitored, an alarm is sent out and the personnel are reminded to avoid danger. According to the invention, pattern recognition is carried out according to typical characteristics of vibration signals when articles fall and personnel fall, and an emergency disposal mechanism for dangerous situations of the escalator is comprehensively provided by combining with different characteristics of vertical distance, running time, installation position and the like of the escalator.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the calculating the first derivative of the second vibration signal and the waveform factor of the second vibration signal, and obtaining the current time domain feature value of the second vibration signal according to the first derivative and the waveform factor specifically includes:
inputting the second vibration signal into a derivative formula
Figure 287869DEST_PATH_IMAGE001
Obtaining a first derivative indicative of the rate of change of said second vibration signal>
Figure 408271DEST_PATH_IMAGE002
Wherein->
Figure 656850DEST_PATH_IMAGE003
Is the firstiVibration signals collected by the data sampling equipment;
inputting the second vibration signal into a waveform factor formula
Figure 520901DEST_PATH_IMAGE004
Obtaining the waveform factor indication offset of the escalator to be monitored>
Figure 538536DEST_PATH_IMAGE005
WhereinNThe number of the data sampling devices arranged in the escalator to be monitored;
indicating the rate of change from the first derivative
Figure 829840DEST_PATH_IMAGE002
And said form factor indicates the offset +.>
Figure 565714DEST_PATH_IMAGE005
And obtaining the current offset distortion degree comprehensive measurement value of the second vibration signal, namely the current time domain characteristic value.
Further, the performing fourier transform on the second vibration signal to obtain a current frequency domain feature value of the second vibration signal specifically includes:
s1, for the second vibration signal
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Conduct +.>
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，/>
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Is expressed as +.>
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Wherein->
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Is the operator of the fourier transform;
s2, if
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Then->
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So the second vibration signal +.>
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Is +.>
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=/>
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；
S3, using delta t to represent sampling interval time, wherein the second vibration signal is
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Then->
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=
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。
Further, the obtaining, according to the first vibration signal, a time domain range threshold and a frequency domain range threshold of the escalator vibration to be monitored specifically includes:
calculating the average value of the first derivative of the first vibration signal to obtain the offset change rate of the first vibration signal;
calculating a waveform factor of the first vibration signal;
obtaining a time domain range threshold value of the escalator to be monitored according to the offset change rate of the first vibration signal and the waveform factor of the first vibration signal;
and drawing an amplitude-frequency characteristic curve of the first vibration signal in a Fourier transform mode to obtain a frequency domain range threshold value of the escalator to be monitored.
Further, the number of the data sampling equipment arrays in the escalator to be monitored is determined by referring to the slow step building standard in the pedestrian step building standard.
Further, the data sampling device array comprises a preset number of vibration sensors, and the vibration sensors are arranged on the continuous steps of the escalator to be monitored in a preset mode.
Further, the step of judging whether the escalator to be monitored falls down with articles according to the current time domain characteristic value and the time domain range threshold value, and the step of judging whether the escalator to be monitored falls down with personnel according to the current frequency domain characteristic value and the frequency domain range threshold value specifically comprises the following steps:
when the current time domain characteristic value exceeds the time domain range threshold value, articles on the escalator to be monitored fall;
and when the current frequency domain characteristic value exceeds the frequency domain range threshold value, judging whether the escalator to be monitored has personnel falling down or not.
The invention also solves the technical problems as follows:
an escalator hazard monitoring and response device based on vibration signal analysis, the device comprising:
the acquisition module is used for acquiring a first vibration signal in the vertical direction of the tread of the escalator to be monitored when the escalator to be monitored normally works through a data sampling equipment array arranged on the escalator to be monitored, and acquiring a time domain range threshold value and a frequency domain range threshold value of the escalator to be monitored vibration according to the first vibration signal;
the processing module is used for collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and carrying out Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal;
the judging module is used for judging whether the object on the escalator to be monitored falls according to the current time domain characteristic value and the time domain range threshold value, and judging whether the escalator to be monitored falls according to the current frequency domain characteristic value and the frequency domain range threshold value;
and the alarm module is used for giving an alarm and reminding people to avoid danger when articles fall or people fall on the escalator to be monitored.
Furthermore, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the escalator hazard monitoring and response method based on vibration signal analysis according to any one of the above-mentioned technical solutions.
The invention also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the escalator danger monitoring and responding method based on vibration signal analysis according to any one of the technical schemes when executing the program.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the embodiments of the present invention or the drawings used in the description of the prior art, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an escalator hazard monitoring and response method based on vibration signal analysis according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of an escalator hazard monitoring and responding device based on vibration signal analysis according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As shown in a flow chart of an escalator danger monitoring and response method based on vibration signal analysis in fig. 1, the method of the embodiment of the invention comprises the following steps:
110. the method comprises the steps of acquiring a first vibration signal in the vertical direction of a step tread of an escalator to be monitored through a data sampling equipment array arranged on the escalator to be monitored, and obtaining a time domain range threshold value and a frequency domain range threshold value of the escalator to be monitored vibration according to the first vibration signal.
120. Collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and carrying out Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal.
130. Judging whether articles fall down on the escalator to be monitored or not according to the current time domain characteristic value and the time domain range threshold value, and judging whether personnel fall down on the escalator to be monitored or not according to the current frequency domain characteristic value and the frequency domain range threshold value.
140. When articles fall or personnel fall on the escalator to be monitored, an alarm is sent out and the personnel are reminded to avoid danger.
The escalator danger monitoring and responding method based on vibration signal analysis provided by the embodiment comprises the steps of acquiring a first vibration signal in the vertical direction of a step tread of an escalator to be monitored when the escalator to be monitored normally works through a data sampling equipment array arranged on the escalator to be monitored, and obtaining a time domain range threshold value and a frequency domain range threshold value of the vibration of the escalator to be monitored according to the first vibration signal; collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and performing Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal; judging whether the escalator to be monitored falls down according to the current time domain characteristic value and the time domain range threshold value, and judging whether the escalator to be monitored falls down by personnel according to the current frequency domain characteristic value and the frequency domain range threshold value; when articles fall or personnel fall on the escalator to be monitored, an alarm is sent out and the personnel are reminded to avoid danger. According to the invention, pattern recognition is carried out according to typical characteristics of vibration signals when articles fall and personnel fall, and an emergency disposal mechanism for dangerous situations of the escalator is comprehensively provided by combining with different characteristics of vertical distance, running time, installation position and the like of the escalator.
Based on the above embodiment, further, in step 120, a first derivative of the second vibration signal and a waveform factor of the second vibration signal are calculated, and a current time domain feature value of the second vibration signal is obtained according to the first derivative and the waveform factor, which specifically includes:
inputting the second vibration signal into a derivative formula
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Obtaining a first derivative indicative of the rate of change of said second vibration signal>
Figure 143042DEST_PATH_IMAGE002
Wherein->
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Is the firstiVibration signals collected by the data sampling device.
Inputting the second vibration signal into a waveform factor formula
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Obtaining the waveform factor indication offset of the escalator to be monitored>
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WhereinNIs the number of data sampling devices provided in the escalator to be monitored.
Indicating the rate of change from the first derivative
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And said form factor indicates the offset +.>
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And obtaining the current offset distortion degree comprehensive measurement value of the second vibration signal, namely the current time domain characteristic value.
It should be appreciated that the rate of change is indicated from the first derivative
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And waveform factor indicative offset ++>
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There are many methods for obtaining the current offset distortion degree comprehensive measurement value of the second vibration signal, and the method can be set according to actual conditionsBy means of weighting values, e.g. setting the first derivative indicative of the rate of change +.>
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The weight value of (2) is 0.4, and the waveform factor indicates the offset>
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If the weight value of (2) is 0.6, the current offset distortion degree integrated measurement value, i.e. the current time domain characteristic value is +.>
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. Of course, other mathematical formulas may be used for calculation, which will not be repeated in the present application.
Further, in step 120, fourier transforming the second vibration signal to obtain a current frequency domain feature value of the second vibration signal, which specifically includes:
s1, for the second vibration signal
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Conduct +.>
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，/>
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Is expressed as +.>
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Wherein->
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Is the operator of the fourier transform.
S2, if
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Then->
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Therefore, it isSaid second vibration signal->
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Is +.>
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=/>
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。
S3, using delta t to represent sampling interval time, wherein the second vibration signal is
Figure 987852DEST_PATH_IMAGE015
Then->
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=
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。
Further, in step 110, a time domain range threshold and a frequency domain range threshold of the escalator vibration to be monitored are obtained according to the first vibration signal, which specifically includes:
and calculating the average value of the first derivative of the first vibration signal to obtain the offset change rate of the first vibration signal.
And calculating the waveform factor of the first vibration signal.
And obtaining the time domain range threshold value of the escalator to be monitored according to the offset change rate of the first vibration signal and the waveform factor of the first vibration signal.
And drawing an amplitude-frequency characteristic curve of the first vibration signal in a Fourier transform mode to obtain a frequency domain range threshold value of the escalator to be monitored.
Further, the number of the data sampling equipment arrays in the escalator to be monitored is determined by referring to the slow step building standard in the pedestrian step building standard.
The data sampling equipment array comprises a preset number of vibration sensors, and the vibration sensors are arranged on the continuous steps of the escalator to be monitored in a preset mode.
It should be understood that the escalator in the present application refers to an escalator without a step setting, and refers to a step construction specification in a step construction standard, and when a vertical drop reaches a certain distance, a step needs to be set in a step. The safety function that replaces the step platform to play is reached through setting up data sampling equipment array in the escalator in this application to adopt equipment to gather the vibration condition of escalator through the data. When the number of the slow-walking platforms meeting the requirement in the escalator to be monitored is as followsmWhen then deploy 2m+1 data employs an array of devices.
Further, step 130 specifically includes:
and when the current time domain characteristic value exceeds the time domain range threshold value, articles on the escalator to be monitored fall.
And when the current frequency domain characteristic value exceeds the frequency domain range threshold value, judging whether the escalator to be monitored has personnel falling down or not.
It should be understood that, in the above embodiment, the vibration sensor array is used as a sampling unit to collect vibration data of the tread of the escalator step in the vertical direction, and pattern recognition is performed according to typical characteristics of vibration signals when articles fall and personnel fall, so as to comprehensively provide an escalator dangerous condition emergency disposal mechanism by combining with different characteristics of the escalator such as vertical distance, running time, installation position and the like.
In the above embodiment, a correlation analysis is provided for indicating the dangerous situation of the escalator and the vibration signal by combining the time-frequency characteristics of the vibration signal. According to the law of conservation of energy, gravitational potential energy is converted into kinetic energy when the article falls, the bouncing height of the article is gradually reduced due to energy loss caused by inelastic collision when the article is contacted with the ground, and a time domain vibration signal represents an approximate sine attenuation wave. Due to the width and height of the steps of the escalator, the situation that multiple people travel simultaneously on the same step of the escalator is not generally generated. When a person walks on the escalator, the energy of the human body is converted into kinetic energy, namely the person does work, and the time domain vibration signal represents approximate square waves. If a person falls on the escalator, the person may struggle or fall down the stairs along with falling, and the frequency domain characteristic of the vibration signal is mainly represented by abnormal impact response of the low-frequency segment and the high-frequency segment at the same time.
Vibration data in the vertical direction of the tread is collected by installing vibration sensors on the tread of the steps, the cost and efficiency of data collection are comprehensively considered, and an array of vibration sensors is installed on 5 continuous steps to serve as an array of data sampling equipment. If m inching platforms are required to be built at equal vertical distances, then 2m+1 data sampling device arrays are required to be deployed for the equal height escalator.
And aiming at the data sampling equipment array, if a plurality of vibration sensors are arranged in the data sampling equipment array, calibrating the threshold value of each vibration sensor in the vibration sensor installation and adjustment stage. If the sampling interval time of the vibration sensors is T, actually measuring and calculating the average value of the first derivative of each vibration sensor in the time range of 100T when the escalator normally works, and obtaining the waveform factor of the vibration sensor array. And determining a time domain range threshold value through the average value of the first derivative and the waveform factor, wherein the time domain range threshold value can be obtained through a weight value method.
When the escalator normally operates, the operation time of the escalator is used as unit time within 24 hours, and the amplitude-frequency characteristic curve of the data sampling equipment array is drawn in a Fourier transform mode, so that the threshold value of the frequency domain range is obtained.
It should be appreciated that the above embodiments may be combined with the differential features of escalator vertical distance, run time, installation location, etc. to comprehensively present an escalator hazard situation emergency disposal mechanism.
The articles on the escalator fall to cause personnel injury, and usually, the personnel cannot timely avoid danger when the articles suddenly fall, so that a voice broadcasting device is arranged on the escalator to carry out dangerous sound alarm. If the articles on the escalator are judged to fall, the escalator immediately sends out an alarm prompt to remind passengers to avoid danger along the running direction of the escalator.
Aiming at the falling situation of personnel on the escalator, different strategies are adopted by comprehensively considering the main differences of the indoor and outdoor escalators. The outdoor ladder is large in vertical height, is greatly influenced by weather factors, is long in dangerous rescue path, and can be immediately decelerated and slowly stopped if people are judged to fall down, and meanwhile the voice broadcasting device alarms to remind rescue. The comprehensive passenger flow of the indoor ladder is monitored to distinguish the operation peak time and the idle time of the escalator, the abnormal situation of the escalator can be treated manually in the operation peak time of the escalator, and the escalator only alarms and reminds for rescue through the voice broadcasting device at the moment and stops the escalator automatically; and in the idle running time period of the escalator, if the escalator is judged to fall down, the voice broadcasting device gives an alarm and prompts, and the escalator enters a speed reduction and stopping stage.
As shown in fig. 2, an escalator hazard monitoring and responding device based on vibration signal analysis, the device comprising:
the acquisition module is used for acquiring a first vibration signal in the vertical direction of the tread of the escalator to be monitored when the escalator to be monitored normally works through a data sampling equipment array arranged on the escalator to be monitored, and acquiring a time domain range threshold value and a frequency domain range threshold value of the escalator to be monitored vibration according to the first vibration signal;
the processing module is used for collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and carrying out Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal;
the judging module is used for judging whether the object on the escalator to be monitored falls according to the current time domain characteristic value and the time domain range threshold value, and judging whether the escalator to be monitored falls according to the current frequency domain characteristic value and the frequency domain range threshold value;
and the alarm module is used for giving an alarm and reminding people to avoid danger when articles fall or people fall on the escalator to be monitored.
Furthermore, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the escalator hazard monitoring and response method based on vibration signal analysis according to any one of the above-mentioned technical solutions.
The invention also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the escalator danger monitoring and responding method based on vibration signal analysis according to any one of the technical schemes when executing the program.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium.
Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), an electrical carrier signal, a telecommunication signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (5)

1. An escalator hazard monitoring and response method based on vibration signal analysis, which is characterized by comprising the following steps:
acquiring a time domain range threshold value and a frequency domain range threshold value of the escalator vibration to be monitored according to a first vibration signal in the vertical direction of a step tread of the escalator to be monitored, wherein the first vibration signal is acquired by a data sampling equipment array arranged on the escalator to be monitored and used for normally working;
collecting a second vibration signal in the vertical direction of the step tread of the escalator to be monitored in real time, calculating a first derivative of the second vibration signal and a waveform factor of the second vibration signal, obtaining a current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor, and carrying out Fourier transformation on the second vibration signal to obtain the current frequency domain characteristic value of the second vibration signal;
judging whether articles fall off the escalator to be monitored or not according to the current time domain characteristic value and the time domain range threshold value, and judging whether personnel fall off the escalator to be monitored or not according to the current frequency domain characteristic value and the frequency domain range threshold value;
when articles fall or personnel fall on the escalator to be monitored, an alarm is sent out and the personnel are reminded to avoid danger;
the calculating the first derivative of the second vibration signal and the waveform factor of the second vibration signal, and obtaining the current time domain characteristic value of the second vibration signal according to the first derivative and the waveform factor specifically includes:
inputting the second vibration signal into a derivative formula
Figure FDA0004224202210000011
Obtaining a first derivative indicative of a rate of change f of the second vibration signal, wherein x i Is the vibration signal collected by the ith data sampling device;
inputting the second vibration signal into a waveform factor formula
Figure FDA0004224202210000012
Obtaining a waveform factor indication offset l of the escalator to be monitored, wherein N is the number of data sampling devices arranged in the escalator to be monitored;
obtaining a comprehensive measurement value of the current offset distortion degree of the second vibration signal, namely the current time domain characteristic value, according to the first derivative indication change rate f and the waveform factor indication offset l;
the fourier transforming the second vibration signal to obtain a current frequency domain characteristic value of the second vibration signal specifically includes:
s1, deriving the second vibration signal m (t)
Figure FDA0004224202210000021
The fourier transform of S (t) is denoted as F: />
Figure FDA0004224202210000022
Wherein e -jwt Is the operator of the fourier transform;
s2, if
Figure FDA0004224202210000023
Then->
Figure FDA0004224202210000024
The Fourier transform of the second vibration signal S (t) is +>
Figure FDA0004224202210000025
S3, the sampling interval time is represented by delta t, and the second vibration signal is S (kdelta t), then
Figure FDA0004224202210000026
Figure FDA0004224202210000027
The step of obtaining the time domain range threshold and the frequency domain range threshold of the escalator vibration to be monitored according to the first vibration signal specifically includes:
calculating the average value of the first derivative of the first vibration signal to obtain the offset change rate of the first vibration signal;
calculating a waveform factor of the first vibration signal;
obtaining a time domain range threshold value of the escalator to be monitored according to the offset change rate of the first vibration signal and the waveform factor of the first vibration signal;
drawing an amplitude-frequency characteristic curve of the first vibration signal in a Fourier transform mode to obtain a frequency domain range threshold value of the escalator to be monitored;
and determining the number of the data sampling equipment arrays in the escalator to be monitored by referring to the construction specification of the slow-walking platform in the construction standard of the pedestrian step.
2. The escalator hazard monitoring and response method based on vibration signal analysis according to claim 1, characterized in that,
the data sampling equipment array comprises a preset number of vibration sensors, and the vibration sensors are arranged on the continuous steps of the escalator to be monitored in a preset mode.
3. The method for monitoring and responding to the danger of the escalator based on the vibration signal analysis according to claim 1, wherein the step of judging whether the escalator to be monitored has articles falling down according to the current time domain characteristic value and the time domain range threshold value, and judging whether the escalator to be monitored has personnel falling down according to the current frequency domain characteristic value and the frequency domain range threshold value, comprises the following steps:
when the current time domain characteristic value exceeds the time domain range threshold value, articles on the escalator to be monitored fall;
and when the current frequency domain characteristic value exceeds the frequency domain range threshold value, judging whether the escalator to be monitored has personnel falling down or not.
4. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements the steps of the escalator hazard monitoring and response method based on vibration signal analysis according to any one of claims 1-3.
5. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the escalator hazard monitoring and response method based on vibration signal analysis according to any one of claims 1 to 3 when executing the program.
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