CN113701877A - Vibration monitoring method for overhead line system - Google Patents
Vibration monitoring method for overhead line system Download PDFInfo
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Abstract
The application belongs to the technical field of power supply of railway power grids, and particularly relates to a vibration monitoring method of a contact net suspension system, wherein in a system constructed by an intelligent online module, a data forwarding module and a data center through a wireless ad hoc network, the intelligent online module is installed on a target contact suspension system, specifically contact suspension components such as a catenary cable or a contact wire and the like, and is used for collecting and processing acceleration data of target contact suspension vibration to obtain the amplitude and frequency of the target contact suspension vibration, and sending original vibration data and a processing result to the data center through the data forwarding module through a wireless communication network; the data center stores, processes, displays data and results, compares historical data according to the processed results, and assists monitoring personnel in judging the physical property degradation condition and the abnormal condition of the target contact suspension, so that the aim of monitoring the contact suspension in real time is fulfilled.
Description
Technical Field
The application relates to the technical field of railway power grid power supply, in particular to a vibration monitoring method for a contact net suspension system.
Background
The contact suspension system mainly comprises a carrier cable, a contact wire and other components, is an important component of the contact network, and can generate continuous vibration under the action of continuous external force, such as typhoon, which is a hazard to the suspension system, damages the physical performance of the suspension system and possibly reduces the working performance and safety of the suspension system.
Over time, if there is a potential for physical conditions of the contact suspension, significant losses can be incurred to the railway grid. The vibration condition of the suspension system can reflect the physical condition and the abnormal condition to a certain extent, so that the monitoring of the vibration condition of the suspension system is meaningful work. However, in the prior art, no device specially used for carrying out real-time online monitoring on the vibration condition of a suspension system in a contact network exists.
Disclosure of Invention
In view of this, an object of the application is to provide a vibration monitoring method for a suspension system of a catenary, which can monitor the vibration condition of the suspension system in the catenary in real time, provide data, and help a monitoring person to judge whether the suspension system is normal or not.
The vibration monitoring method of the contact net suspension system is applied to a vibration monitoring device of the contact net suspension system, and the vibration monitoring device of the contact net suspension system comprises an intelligent online module, a data forwarding module and a data center; the method comprises the following steps:
the intelligent online module, the data forwarding module and the data center construct a wireless communication network through a wireless communication protocol, and the intelligent online module performs data and/or instruction transmission with the data center through the data forwarding module in the wireless communication network;
the intelligent online module is arranged on the target contact suspension, acceleration data of the target contact suspension during vibration are collected through an acceleration sensor of the intelligent online module, the acceleration data collected by the acceleration sensor are processed through a microprocessor of the intelligent online module, analysis results of the amplitude and the frequency of the target contact suspension are obtained, and the analysis results of the target contact suspension vibration are sent to a data center through a data forwarding module through a wireless communication network;
and the data center stores the analysis result sent by the data forwarding module and judges the physical performance of the target contact suspension according to the analysis result.
In some embodiments, the intelligent online module, the data forwarding module and the data center are constructed as a wireless communication network system through a wireless communication protocol, and the method comprises the following steps:
respectively installing intelligent online modules on a plurality of sections of contact suspensions in a contact network, and labeling each intelligent online module for determining the installation position of the intelligent online module according to the label;
the intelligent online module, the nearby data forwarding module and the terminal data center are constructed into a wireless communication network by utilizing the wireless module; the intelligent online module is used for receiving data and/or instructions sent by the intelligent online modules in a certain area and transmitting the data and/or instructions to the data center.
In some embodiments, the intelligent online module is installed on the target contact suspension, and the acceleration data of the target contact suspension during vibration is collected through an acceleration sensor of the intelligent online module, and the method comprises the following steps:
when acceleration data of a target contact suspension collected by an acceleration sensor in the intelligent online module exceeds a set first threshold value, the intelligent online module is converted into a working state from a standby state;
and under the working state of the intelligent online module, the microprocessor of the intelligent online module starts to store and process the acceleration data sent by the acceleration sensor.
In some embodiments, the microprocessor of the intelligent online module processes the acceleration data collected by the acceleration sensor to obtain the analysis result of the amplitude and frequency of the target contact suspension by the following method, including the following steps:
performing discrete Fourier transform on the acceleration data, converting the acceleration data into a frequency domain for processing, and obtaining frequency components of the acceleration data;
carrying out band-pass filtering on the obtained acceleration data frequency component to remove high-frequency random noise and low-frequency noise in the acceleration data frequency component;
performing primary frequency domain integration on the acceleration data frequency component subjected to band-pass filtering to obtain frequency domain expression of speed, performing high-pass filtering and trend item removal processing on an integration result, and performing secondary frequency domain integration to obtain a frequency domain expression result of displacement, wherein the result contains amplitude and frequency information, and accordingly obtaining an amplitude value and a frequency value of vibration;
and performing Fourier inverse transformation on the obtained displacement expression to obtain a time domain expression of the amplitude and the frequency.
In some embodiments, the acceleration data includes an X-axis acceleration value, a Y-axis acceleration value, and a Z-axis acceleration value; and respectively processing the three-axis acceleration values by a microprocessor in the intelligent online module to determine the amplitude and the frequency of the target contact suspension in each axis direction, and acquiring a space vibration analysis comprehensive conclusion of the target contact suspension according to the amplitude and the frequency.
In some embodiments, the data center stores the analysis result sent by the data forwarding module, and determines the physical property of the target contact suspension according to the analysis result, including the following steps:
and if the amplitude of the target contact suspension exceeds a set second threshold value, the data center judges that the physical property of the target contact suspension is abnormal and sends out warning information.
In some embodiments, the vibration monitoring device for the overhead line system further comprises an intelligent online module, wherein the intelligent online module is used for sending data and/or instructions to the data forwarding module, the intelligent online module comprises an acceleration sensor and a microprocessor, the microprocessor acquires acceleration data of the contact suspension vibration by using the acceleration sensor, and analyzes the acceleration data to obtain the amplitude and the frequency of the target contact suspension;
the data forwarding modules are used for forwarding data and/or instructions sent by the intelligent online modules to the data center, wherein one data forwarding module is used for receiving data sent by all the intelligent online modules in a certain area;
and the data center is used for judging whether the physical performance of the target contact suspension is abnormal or not according to the analysis result and the historical data transferred by the data forwarding module.
In some embodiments, further comprising:
and the wireless module is used for constructing the intelligent online module arranged on the contact suspension, the data forwarding module arranged on the ground and the data center into a wireless communication network through a wireless communication protocol.
In some embodiments, the microprocessor of the intelligent presence module comprises:
the first calculation unit is used for performing discrete Fourier transform on the acceleration data, converting the acceleration data into frequency domain processing and obtaining frequency components of the acceleration data;
the filtering unit is used for carrying out band-pass filtering on the obtained acceleration data frequency component so as to remove high-frequency random noise and low-frequency noise in the acceleration data frequency component;
the second calculation unit is used for performing primary frequency domain integration on the acceleration data frequency component subjected to band-pass filtering to obtain frequency domain expression of the speed, performing high-pass filtering and trend removing item processing on an integration result, performing secondary frequency domain integration to obtain a frequency domain expression result of the displacement, and accordingly obtaining an amplitude value and a frequency value of the vibration;
and the third calculating unit is used for performing inverse Fourier transform on the obtained displacement expression to obtain a time domain expression of amplitude and frequency.
In some embodiments, the data center comprises:
a judging unit configured to judge whether a health state of the target contact suspension is acceptable or not based on the analysis result;
and the warning unit is used for sending a warning instruction to the intelligent online module on the target contact suspension when the judging unit judges that the health state of the target contact suspension is unqualified.
In the vibration monitoring method for the overhead line system provided by the embodiment of the application, in a wireless communication network constructed by an intelligent online module, a data forwarding module and a data center through a wireless communication protocol, the intelligent online module acquires acceleration data of vibration of a target contact suspension caused in the process that an electric locomotive drives through the target contact suspension through an acceleration sensor arranged on the target contact suspension; analyzing acceleration data acquired by an acceleration sensor through a microprocessor to obtain the amplitude and frequency of the target contact suspension, and sending an analysis result of the target contact suspension caused by the electric locomotive to the data center through a data forwarding module through a wireless communication network; and the data center judges whether the physical state of the target contact suspension is normal or not according to the analysis result, so that the aim of monitoring the contact suspension in real time is fulfilled, and the intelligent maintenance of a contact net is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a flow chart illustrating a vibration monitoring method provided by an embodiment of the present application;
fig. 2 is a flowchart illustrating a method for constructing a wireless communication network according to an embodiment of the present disclosure;
FIG. 3 is a flow chart illustrating the intelligent online module provided by the embodiment of the present application collecting target contact suspension acceleration data;
FIG. 4 is a flow chart illustrating the analysis of acceleration data by the microprocessor provided by the embodiments of the present application;
fig. 5 is a block diagram illustrating a structure of a vibration device according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for illustrative and descriptive purposes only and are not used to limit the scope of protection of the present application. Additionally, it should be understood that the schematic drawings are not necessarily drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be performed out of order, and steps without logical context may be performed in reverse order or simultaneously. One skilled in the art, under the guidance of this application, may add one or more other operations to, or remove one or more operations from, the flowchart.
In addition, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that in the embodiments of the present application, the term "comprising" is used to indicate the presence of the features stated hereinafter, but does not exclude the addition of further features.
In a railway power supply system, a contact net is an important component of the railway power supply system, a contact suspension is an important component of the contact net, and if hidden dangers occur in the physical condition of the contact suspension, great loss can be caused to the railway power supply system. However, in the prior art, the potential hazards can only be discovered through regular inspection by the power operators.
Based on the fact that the contact suspension can reflect the physical condition of suspension when a train passes through or strong wind occurs, for example, as shown in the attached drawing 1 of the specification, the vibration monitoring method of the contact net suspension system is provided and applied to a vibration monitoring device of the contact net suspension system, the vibration monitoring device of the contact net suspension system comprises an intelligent online module, a data forwarding module and a data center, and the method comprises the following steps:
s1, the intelligent online module, the data forwarding module and the data center construct a wireless communication network through a wireless communication protocol, and in the wireless communication network, the intelligent online module transmits data and/or instructions with the data center through the data forwarding module;
s2, the intelligent online module is installed on the target contact suspension, acceleration data of the target contact suspension during vibration are collected through an acceleration sensor of the intelligent online module, the acceleration data collected by the acceleration sensor are processed through a microprocessor of the intelligent online module, analysis results of the amplitude and the frequency of the target contact suspension are obtained, and the analysis results of the target contact suspension vibration are sent to a data center through a data forwarding module through a wireless communication network;
and S3, storing the analysis result sent by the data forwarding module by the data center, and judging the physical performance of the target contact suspension according to the analysis result.
As shown in fig. 2, in step S1, a wireless communication network is constructed by:
s101, respectively installing intelligent online modules on a plurality of sections of contact suspensions in a contact network, and labeling each intelligent online module to determine the installation position of the intelligent online module according to the label;
s102, constructing an intelligent online module, a nearby data forwarding module and a terminal data center into a wireless communication network by utilizing a wireless module; the intelligent online module is used for receiving data and/or instructions sent by the intelligent online modules in a certain area and transmitting the data and/or instructions to the data center.
By constructing the wireless communication network, data and/or instructions can be transmitted among the intelligent online module, the data forwarding module and the data center in real time, and a foundation is laid for constructing intelligent monitoring of a railway power supply system.
In this embodiment, the data center can determine the intelligent presence module location, i.e., the location of the contact suspension monitored by the intelligent presence module, from the designation of each intelligent presence module. In other embodiments, the intelligent online module can also be provided with chips such as a GPS and a Beidou, and the data center determines the position of the corresponding intelligent online module through the GPS and the Beidou chips.
In the step S2, the intelligent online module includes an acceleration sensor and a microprocessor, and since the intelligent online module is mounted on the contact suspension, the acceleration sensor can monitor acceleration data of the contact suspension, which moves under the action of an external force, in this embodiment, the external force is mainly vibration caused to the contact suspension when the electric train passes through or encounters strong wind. Wherein, in order to reduce the power consumption, when no electric train passes through and brings vibration to the contact suspension, the intelligent online module is in a standby state. Therefore, as shown in the attached fig. 3 of the specification, the intelligent online module collects the acceleration data of the target contact suspension vibration by the following means:
s201, when an acceleration sensor in the intelligent online module acquires that acceleration data of a target contact suspension exceeds a set first threshold, the intelligent online module is converted from a standby state to a working state;
s202, when the intelligent online module is in a working state, a microprocessor of the intelligent online module starts to store and process acceleration data sent by the acceleration sensor.
In some embodiments, the intelligent online module employs a three-axis acceleration sensor model LIS3DH and a microprocessor CC1312 with a radio frequency module, and the intelligent online module collects acceleration values of three axial directions of the contact suspension through the three-axis acceleration sensor, namely an X-axis acceleration value, a Y-axis acceleration value and a Z-axis acceleration value. Because the contact suspension is tight, the acceleration values of the contact suspension in three axial directions tend to zero when no electric train passes or encounters strong wind; the contact suspension moves when the electric train passes or encounters strong winds. Under normal conditions, the contact suspension can vibrate up and down or sway left and right when the electric train passes or encounters strong wind. If the contact suspension is worn to a greater extent, acceleration values of the contact suspension in the Y-axis direction and the Z-axis direction when the electric train passes by will differ from the historical data to a certain extent, compared to an intact contact suspension. Therefore, the physical state of the contact suspension can be monitored by analyzing the acceleration data acquired by the acceleration sensor, and hidden dangers can be found in advance.
The acceleration data analyzed by the microprocessor of the intelligent online module should be the acceleration data of the electric train passing through the target contact suspension collected by the acceleration sensor. Because the acceleration data when the target contacts and hangs when no electric power train passes through or meets strong wind tends to zero, the microprocessor of the intelligent online module sets a first threshold value, when the acceleration data collected by the acceleration sensor is monitored to exceed the threshold value, the electric power train is judged to pass through the target contact and hang, the intelligent online module starts to enter a working state, the acceleration data collected by the acceleration sensor within 5 seconds is stored, and preliminary analysis is carried out.
In other embodiments, the time duration for the acceleration sensor to acquire the acceleration data may be adjusted according to the time duration for the train to pass through, and is not limited or fixed herein. Typically, the set time is the train passing time plus 3 seconds, because the contact suspension will vibrate for a period of time to stop gradually after the electric train passes or encounters strong wind.
As shown in fig. 4, the microprocessor analyzes the acceleration data collected by the acceleration by the following steps:
s203, performing discrete Fourier transform on the acceleration data, converting the acceleration data into a frequency domain for processing, and obtaining a frequency component of the acceleration data;
s204, performing band-pass filtering on the obtained acceleration data frequency component to remove high-frequency random noise and low-frequency noise in the acceleration data frequency component;
s205, performing primary frequency domain integration on the acceleration data frequency component subjected to band-pass filtering to obtain frequency domain expression of speed, performing high-pass filtering and trend removing item processing on an integration result, performing secondary frequency domain integration to obtain a frequency domain expression result of displacement, and accordingly obtaining an amplitude value and a frequency value of vibration;
s206, performing Fourier inverse transformation on the obtained displacement expression to obtain a time domain expression of amplitude and frequency.
In practical application, the acceleration value obtained by the acceleration sensor is not ideal, the collected acceleration value and the actual motion have large errors, and the errors need to be eliminated and corrected to be used for integration to obtain a more accurate speed value and displacement value, so that a relatively accurate vibration frequency and vibration amplitude are obtained. It is emphasized here that the vibration frequency and vibration amplitude of the contact suspension are to be obtained, and that no permanent displacement is calculated.
Wherein the acceleration error includes the influence of the zero drift error and the high frequency noise component. The zero drift error, that is, the acceleration value acquired by the acceleration sensor when the actual acceleration value is zero, is not zero, and has a relatively fixed output value, if the zero drift error is not eliminated, the value will generate an error accumulation effect when the second integration is performed subsequently, so that the result is deviated, and therefore, the influence of the zero error must be eliminated. In the frequency domain, the error may appear as a low frequency or dc component. The high-frequency noise component may affect the instantaneous speed and the displacement precision, and low-pass filtering elimination or smoothing processing can be performed to reduce the influence.
In step S203, the microprocessor performs discrete fourier transform on the obtained acceleration data a to obtain a frequency domain component arejωtWherein A isrThe r-th frequency component of the acceleration a has a modulus value, and ω ═ 2 π f is the angular frequency of the acceleration change.
In step S204, the result of the fourier transform in step S203 is subjected to band-pass filtering processing, and according to actual needs and scene analysis, unnecessary dc components, i.e., ω is 0 and frequency components that do not match the actual conditions (ω is too small) are discarded.
In step S205, a calculation formula of velocity is obtained by first integrating once, and then a calculation formula of displacement is obtained by integrating twice, where the calculation formula of velocity is as follows:
the formula for the displacement is as follows:
the cutoff frequency omega d is set according to an actual measurement experiment, and the actual experiment verification analysis shows that the measured value is more consistent with an actual preset value when f is more than or equal to 0.5Hz, namely omega is more than or equal to pi (rad/s). When omega is too small, the measurement result has a larger error with the actual preset value, because of low-frequency components, a trend term appears after the first integration, and an obvious accumulation effect appears after the second integration, so that the result has a larger error. Therefore, in practical use, the acceleration sensor must be reasonably selected and the appropriate cut-off frequency ω d must be set in combination with the actual vibration frequency and amplitude on site, otherwise, the measurement result will have a large error. In the experiment, the vibration has the frequency of 2Hz-20Hz and the amplitude of 3mm-45 mm. The error of the test result is within 10%, and the following table (i.e. table 1) shows the preset values and the measured values when the vibration frequency is 2Hz and 3Hz, and the amplitude is 3mm and 45mm, respectively:
TABLE 1
And further executing the step S206, performing inverse fourier transform on the obtained displacement expression to obtain a time domain expression of amplitude and frequency, so as to perform further data processing.
In the step S3, the data center is mainly used for performing human-computer interaction, and receiving, storing, analyzing and displaying data, and is also used for issuing and updating a program algorithm to the intelligent online module and the data forwarding module through the wireless communication network. And if the amplitude frequency of the target contact suspension exceeds the set second threshold, the data center judges that the physical condition of the target contact suspension is possibly abnormal and sends warning information to monitoring personnel.
The application provides a method for monitoring vibration of a contact net suspension system, through installing an intelligent online module on a contact suspension in a contact net, acceleration data of vibration of a target contact suspension is collected and analyzed, an analysis result is sent to a data center through a data forwarding module, and the physical state of the target contact suspension is judged through the data center, so that the purpose of monitoring the contact suspension in real time is achieved, hidden dangers are discovered as early as possible, and loss caused by faults is avoided.
As shown in fig. 5, the present application further provides a system for monitoring contact suspension vibration, comprising:
the intelligent online module 501 is used for sending data and/or instructions to the data forwarding module 502, and mainly comprises an acceleration sensor, a microprocessor and a solar power supply module, wherein the microprocessor collects acceleration data of contact suspension vibration by using the acceleration sensor and analyzes the acceleration data to obtain the amplitude and frequency of target contact suspension;
the data forwarding modules 502 are configured to forward data and/or instructions sent by the intelligent online modules 501 to the data center 503, where one data forwarding module 502 is configured to receive data sent by all the intelligent online modules 501 in a certain area;
and the data center 503 is configured to determine whether the physical state of the target contact suspension is abnormal according to the analysis result and the historical data transferred by the data forwarding module 502.
In addition, the system for monitoring vibration of a contact suspension, provided by the embodiment of the application, is a wireless module, and is configured to construct a wireless communication network by using a wireless communication protocol, the intelligent online module 501 installed on the contact suspension, the data forwarding module 502 arranged on the ground, and the data center 503.
Further, the microprocessor function of the intelligent online module comprises:
the first calculation function is used for carrying out discrete Fourier transform on the acceleration data, converting the acceleration data into frequency domain processing and obtaining frequency components of the acceleration data;
the digital filtering function is used for carrying out band-pass filtering on the obtained acceleration data frequency component so as to remove high-frequency random noise and low-frequency noise in the acceleration data frequency component;
the second calculation function is used for carrying out primary frequency domain integration on the acceleration data frequency component subjected to band-pass filtering to obtain frequency domain expression of the speed, carrying out high-pass filtering and trend removing item processing on an integration result, carrying out secondary frequency domain integration to obtain a frequency domain expression result of the displacement, and accordingly obtaining an amplitude value and a frequency value of the vibration;
and the third calculation function is used for carrying out inverse Fourier transform on the obtained displacement expression to obtain a time domain expression of the amplitude and the frequency.
The data center includes:
a big data judgment function for judging whether the physical state of the target contact suspension is acceptable or not based on the analysis result and the historical data;
and the warning unit is used for sending warning information to monitoring personnel when the judging unit judges that the state of the target contact suspension is normal.
According to the system for monitoring the contact suspension vibration, in a wireless communication network constructed by an intelligent online module, a data forwarding module and a data center through a wireless communication protocol, the intelligent online module is installed on a target contact suspension line, and acceleration data of the target contact suspension vibration caused in the process that an electric locomotive drives through the target contact suspension line are collected through an acceleration sensor; the acceleration data collected by the acceleration sensor are stored, analyzed and transmitted through the microprocessor to obtain the amplitude and the frequency of the target contact suspension, and the analysis result of the vibration of the electric locomotive caused by the target contact suspension is sent to the data center through the data forwarding module through the wireless communication network; and the data center judges whether the physical state of the target contact suspension is normal or not according to the analysis result, so that the aim of monitoring the contact suspension in real time is fulfilled, and the intelligent maintenance of a contact net is facilitated.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The vibration monitoring method of the contact net suspension system is characterized by being applied to a vibration monitoring device of the contact net suspension system, wherein the vibration monitoring device of the contact net suspension system comprises an intelligent online module, a data forwarding module and a data center; the method comprises the following steps:
the intelligent online module, the data forwarding module and the data center construct a wireless communication network through a wireless communication protocol, and the intelligent online module performs data and/or instruction transmission with the data center through the data forwarding module in the wireless communication network;
the intelligent online module is arranged on the target contact suspension, acceleration data of the target contact suspension during vibration are collected through an acceleration sensor of the intelligent online module, the acceleration data collected by the acceleration sensor are processed through a microprocessor of the intelligent online module, analysis results of the amplitude and the frequency of the target contact suspension are obtained, and the analysis results of the target contact suspension vibration are sent to a data center through a data forwarding module through a wireless communication network;
and the data center stores the analysis result sent by the data forwarding module and judges the physical performance of the target contact suspension according to the analysis result.
2. The vibration monitoring method of the overhead line system of claim 1, wherein the intelligent online module, the data forwarding module and the data center construct a wireless communication network system through a wireless communication protocol, and the method comprises the following steps:
respectively installing intelligent online modules on a plurality of sections of contact suspensions in a contact network, and labeling each intelligent online module for determining the installation position of the intelligent online module according to the label;
the intelligent online module, the nearby data forwarding module and the terminal data center are constructed into a wireless communication network by utilizing the wireless module; the intelligent online module is used for receiving data and/or instructions sent by the intelligent online modules in a certain area and transmitting the data and/or instructions to the data center.
3. The vibration monitoring method of the catenary suspension system as claimed in claim 2, wherein the intelligent online module is installed on the target contact suspension, and the acceleration data of the target contact suspension during vibration is collected by an acceleration sensor of the intelligent online module, and the method comprises the following steps:
when acceleration data of a target contact suspension collected by an acceleration sensor in the intelligent online module exceeds a set first threshold value, the intelligent online module is converted into a working state from a standby state;
and under the working state of the intelligent online module, the microprocessor of the intelligent online module starts to store and process the acceleration data sent by the acceleration sensor.
4. The vibration monitoring method of the overhead line system of claim 3, wherein the microprocessor of the intelligent online module processes the acceleration data acquired by the acceleration sensor in the following manner to obtain the analysis result of the amplitude and frequency of the target contact suspension, and the method comprises the following steps:
performing discrete Fourier transform on the acceleration data, converting the acceleration data into a frequency domain for processing, and obtaining frequency components of the acceleration data;
carrying out band-pass filtering on the obtained acceleration data frequency component to remove high-frequency random noise and low-frequency noise in the acceleration data frequency component;
performing primary frequency domain integration on the acceleration data frequency component subjected to band-pass filtering to obtain frequency domain expression of the speed, performing high-pass filtering and trend item removal processing on an integration result, performing secondary frequency domain integration to obtain a frequency domain expression result of the displacement, and accordingly obtaining an amplitude value and a frequency value of the vibration;
and performing Fourier inverse transformation on the obtained displacement expression to obtain a time domain expression of the amplitude and the frequency.
5. The method of claim 4, wherein the acceleration data comprises an X-axis acceleration value, a Y-axis acceleration value, and a Z-axis acceleration value; and respectively processing the three-axis acceleration values by a microprocessor in the intelligent online module to determine the amplitude and the frequency of the target contact suspension in each axis direction, and acquiring a space vibration analysis comprehensive conclusion of the target contact suspension according to the amplitude and the frequency.
6. The vibration monitoring method of the overhead line system of claim 5, wherein the data center stores the analysis result sent by the data forwarding module, and judges the physical property of the target contact suspension according to the analysis result, comprising the following steps:
and if the amplitude of the target contact suspension exceeds a set second threshold value, the data center judges that the physical property of the target contact suspension is abnormal and sends out warning information.
7. The utility model provides a vibration monitoring devices of contact net suspension which characterized in that includes:
the intelligent online module is used for sending data and/or instructions to the data forwarding module, and comprises an acceleration sensor and a microprocessor, wherein the microprocessor acquires acceleration data of contact suspension vibration by using the acceleration sensor and analyzes the acceleration data to obtain the amplitude and frequency of target contact suspension;
the data forwarding modules are used for forwarding data and/or instructions sent by the intelligent online modules to the data center, wherein one data forwarding module is used for receiving data sent by all the intelligent online modules in a certain area;
and the data center is used for judging whether the physical performance of the target contact suspension is abnormal or not according to the analysis result and the historical data transferred by the data forwarding module.
8. The vibration monitoring device of the catenary suspension system of claim 7, further comprising:
and the wireless module is used for constructing the intelligent online module arranged on the contact suspension, the data forwarding module arranged on the ground and the data center into a wireless communication network through a wireless communication protocol.
9. The vibration monitoring device of the catenary suspension system of claim 8, wherein the microprocessor function of the intelligent online module comprises:
the first calculation function is used for carrying out discrete Fourier transform on the acceleration data, converting the acceleration data into frequency domain processing and obtaining the frequency component of the acceleration data;
the digital filtering function is used for carrying out band-pass filtering on the obtained acceleration data frequency component so as to remove high-frequency random noise and low-frequency noise in the acceleration data frequency component;
the second calculation function is used for carrying out primary frequency domain integration on the acceleration data frequency component subjected to band-pass filtering to obtain frequency domain expression of the speed, carrying out high-pass filtering and trend removing item processing on an integration result, carrying out secondary frequency domain integration to obtain a frequency domain expression result of the displacement, and accordingly obtaining an amplitude value and a frequency value of the vibration;
and performing a third calculation function, namely performing inverse Fourier transform on the obtained displacement expression to obtain a time domain expression of the amplitude and the frequency.
10. The vibration monitoring device of a catenary suspension system of claim 9, wherein the data center comprises:
the data storage function, the explicit function and the data analysis function are used for judging whether the physical state of the target contact suspension is abnormal or not and whether the physical performance is good or not based on the analysis result;
and the warning unit is used for sending warning information to monitoring personnel when the physical state of the target contact suspension is abnormal.
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