CN115038161B - Vibration data wireless synchronous acquisition method, system and vibration monitoring system - Google Patents
Vibration data wireless synchronous acquisition method, system and vibration monitoring system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a wireless synchronous acquisition method and system for vibration data and a vibration monitoring system, wherein the method comprises the following steps: periodically broadcasting and transmitting synchronous acquisition broadcast messages to a plurality of wireless vibration sensors, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and time stamps of current messages; the awakened sensor scans and receives synchronous acquisition broadcast messages; each sensor stores the synchronous acquisition broadcast message received for the first time after the sensor wakes up, and the local time or the local synchronous acquisition time of each sensor is calibrated by utilizing the timestamp; if the time interval between the two sensors is larger than the broadcasting period, continuously receiving synchronous acquisition broadcasting information to calibrate and store the local time of the sensors and the local synchronous acquisition time; if the time interval between the two is smaller than or equal to the broadcasting period, each sensor stops receiving the broadcasting message, starts timing, and starts data acquisition until the current latest local synchronous acquisition time is reached.
Description
Technical Field
The invention relates to the field of vibration monitoring, in particular to a wireless synchronous acquisition method and system for vibration data and a vibration monitoring system.
Background
Vibration monitoring and vibration analysis are the most common and effective methods for monitoring the fault running state and diagnosing faults of rotary mechanical equipment, and the current data transmission modes of a sensor for collecting vibration data and an acquisition terminal are divided into wired or wireless modes, wherein the wired transmission modes can be provided with a shorter acquisition interval, a longer data length and are easy to realize synchronous acquisition, but have the problem of troublesome wiring and construction; the wireless transmission mode does not need wiring, is simple to install, but is long in acquisition time interval and limited in data length due to battery power consumption and incapability of being directly controlled.
Compared with a wired transmission mode, the difficulty of realizing synchronous acquisition in a wireless transmission mode is much greater.
The synchronization method between the wireless sensor and the acquisition terminal usually comprises a GPS clock synchronization method and a protocol synchronization method, wherein the GPS clock synchronization method requires additional addition of a GPS chip and additional increase of electric quantity consumption and cost; the protocol synchronization method is that a sensor and each acquisition node calculate the transmission time of each sensor link through the command sending and the reply time difference of a unidirectional traffic link, calculate time compensation according to the transmission time of all sensors, and send synchronous acquisition commands in sequence according to the time sequence of the compensation to carry out synchronous acquisition, and the defect is that when the number of the sensor nodes is large, the network signals are bad or are severely interfered, especially zigbee is in the 2.4G frequency band shared by WiFi and Bluetooth, the wireless signal quality is very poor due to the interference of a mobile phone and a WiFi router, wireless packet loss is caused, and the calculated transmission time delay is very inaccurate due to the randomness of the packet loss, thereby affecting the accuracy of synchronous acquisition. In addition, when the sensor nodes are many, each sensor is connected in sequence and sends a synchronous acquisition command, which may take a long time to affect the synchronous acquisition effect, even if one or more sensors cannot be successfully connected due to low voltage of a battery or the like, the synchronous acquisition effect is also affected.
The above disclosure of background art is only for aiding in understanding the inventive concept and technical solution of the present application, and it does not necessarily belong to the prior art of the present patent application, nor does it necessarily give technical teaching; the above background should not be used to assess the novelty and creativity of the present application in the event that no clear evidence indicates that such is already disclosed prior to the filing date of the present patent application.
Disclosure of Invention
The application aims to provide a wireless synchronous acquisition method and system for vibration data without a GPS chip, which can achieve microsecond synchronous acquisition effect by utilizing a wireless broadcast protocol.
In order to achieve the above purpose, the application adopts the following technical scheme:
a wireless synchronous acquisition method of vibration data is provided, which is characterized in that under the condition of no need of a GPS chip, synchronous data acquisition of a plurality of wireless vibration sensors is carried out through the following steps:
periodically broadcasting and transmitting synchronous acquisition broadcast messages to a plurality of wireless vibration sensors at each preset broadcasting round, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and time stamps of current messages, and the synchronous acquisition time is later than the time stamps;
The awakened wireless vibration sensor scans and receives the synchronous acquisition broadcast message;
each wireless vibration sensor stores a synchronous acquisition broadcast message received for the first time after the wireless vibration sensor wakes up, and uses a time stamp in the synchronous acquisition broadcast message to calibrate the local time of the respective sensor or update the local synchronous acquisition time;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is larger than the broadcasting round period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcast message, meanwhile, the local time and the local synchronous acquisition time of the sensors are calibrated by utilizing the new synchronous acquisition broadcast message, and the updated local time and the local synchronous acquisition time are stored;
if the time interval between the current local time and the current synchronous acquisition time is smaller than or equal to the broadcasting round period, each wireless vibration sensor stops receiving the broadcasting message and starts a timer to time until the current latest local synchronous acquisition time is reached, and the corresponding wireless vibration sensor starts to acquire data.
Any one or a combination of the foregoing technical solutions, further, after storing the updated local time and the local synchronous acquisition time, the wireless vibration sensor continuously compares the current local time with the current local synchronous acquisition time, and if the time interval is greater than the broadcasting round period and less than the sleep duration period, repeatedly performs: and continuing to scan and receive the synchronous acquisition broadcast message, and simultaneously calibrating the local time and the local synchronous acquisition time of the sensor by utilizing the new synchronous acquisition broadcast message, and storing the updated local time and the updated local synchronous acquisition time.
Any one or a combination of the foregoing technical solutions, further, if a time interval between the current local time and the current local synchronous acquisition time is greater than a sleep duration period, the wireless vibration sensor enters a sleep mode, is woken up again after the sleep duration period, and scans and receives the synchronous acquisition broadcast message.
The wireless vibration sensor may further perform scanning to receive the synchronous acquisition broadcast message for one or more times until the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcast round period.
Any one or a combination of the foregoing, further wherein calibrating the respective sensor local time or updating the local synchronous acquisition time with the timestamp in the synchronous acquisition broadcast message further includes:
the wireless vibration sensor compares the sensor local time t 1 And the timestamp T 1 If the local time t 1 Less than the time stamp T 1 Or the local time t 1 Subtracting the time stamp T 1 If the difference value of the sensor is larger than the preset time difference value threshold value, calibrating the local time of the sensor, so that the calibrated local time of the sensor is the time stamp T 1 ；
If the local time t 1 Greater than or equal to the time stamp T 1 And the local time t 1 Subtracting the time stamp T 1 If the difference value of the local synchronization acquisition time is smaller than or equal to the preset time difference value threshold value, updating the local synchronization acquisition time to be t s ＝T s +t 1 -T 1 Wherein t is s For updated local synchronous acquisition time, T s To synchronously acquire the synchronous acquisition time in the broadcast message, t 1 For the sensor local time, T 1 The time stamps in the broadcast messages are collected for synchronization.
Any one or a combination of the foregoing, further wherein calibrating the sensor local time and the local synchronous acquisition time with the new synchronous acquisition broadcast message further includes:
the wireless vibration sensor is calibrated with local synchronous acquisition time as follows: t' s ＝t 1 +(t s -t 1 )*(t 2 -t 1 )/(T 2 -T 1 ) Wherein t' s For the calibrated local synchronous acquisition time, t s To locally synchronize acquisition time before calibration, t 1 For the local time of the sensor when the synchronous acquisition broadcast message is received for the first time, t 2 For the local time of the sensor when receiving a new synchronous acquisition broadcast message, T 1 For the first time received the time stamp in the synchronous acquisition broadcast message, T 2 Collecting a time stamp in the broadcast message for the new synchronization;
the wireless vibration sensor calibration sensor local time is as follows: t is t 2 ＝T 2 Wherein t is 2 For the calibrated sensor local time, T 2 The time stamps in the broadcast message are collected for the new synchronization.
Any one or a combination of the above-mentioned technical solutions, further, the wireless vibration sensor calibrates the local time of the sensor first, and calibrates the local synchronous acquisition time later;
if the local synchronous acquisition time is not updated when the synchronous acquisition broadcast message is received for the first time, the local synchronous acquisition time before calibration is the synchronous acquisition time in the synchronous acquisition broadcast message.
Any one or a combination of the above technical solutions, further, the synchronous acquisition broadcast message further includes a preset synchronous acquisition sampling point number, and the corresponding wireless vibration sensor starts to perform data acquisition until the acquired sampling point number meets the synchronous acquisition sampling point number in the synchronous acquisition broadcast message.
Any one or a combination of the above-mentioned technical solutions, further, before completing data acquisition, the wireless vibration sensor does not perform a reply confirmation operation;
The preset broadcasting round period is set to be less than 500.1ms, or set to be less than 300.1ms, or set to be less than 200.1ms, or set to be less than 150.1ms, or set to be less than 100.1ms.
According to another aspect of the present invention, there is provided a wireless synchronous acquisition system for vibration data, including a wireless acquisition gateway and a plurality of wireless vibration sensors, wherein the wireless acquisition gateway is configured to receive data acquired by the wireless vibration sensors, and the synchronous data acquisition of the plurality of wireless vibration sensors is performed without a GPS chip by:
the wireless acquisition gateway receives a synchronous acquisition instruction issued by an upper layer system, wherein the synchronous acquisition instruction comprises synchronous acquisition time and identification numbers of a plurality of wireless vibration sensors needing synchronous acquisition;
the wireless acquisition gateway responds to the synchronous acquisition instruction, and periodically broadcasts and transmits synchronous acquisition broadcast messages at intervals of preset broadcast rounds, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a time stamp of a current message, and the synchronous acquisition time is later than the time stamp;
the wireless acquisition gateway wakes up a plurality of corresponding wireless vibration sensors according to the identification number information in the synchronous acquisition instruction, and the wakened wireless vibration sensors scan and receive synchronous acquisition broadcast messages broadcast by the wireless acquisition gateway;
Each wireless vibration sensor stores a synchronous acquisition broadcast message received for the first time after the wireless vibration sensor wakes up, and uses a time stamp in the synchronous acquisition broadcast message to calibrate the local time of the respective sensor or update the local synchronous acquisition time;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is larger than the broadcasting round period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway, and meanwhile calibrate the local time and the local synchronous acquisition time of the sensors by utilizing the new synchronous acquisition broadcast message, and store the updated local time and the local synchronous acquisition time;
if the time interval between the current local time and the current synchronous acquisition time is smaller than or equal to the broadcasting round period, each wireless vibration sensor stops receiving the broadcasting message and starts a timer to time until the current latest local synchronous acquisition time is reached, and the corresponding wireless vibration sensor starts to acquire data.
Any one or a combination of the foregoing technical solutions, further, after storing the updated local time and the local synchronous acquisition time, the wireless vibration sensor continuously compares the current local time with the current local synchronous acquisition time, and if the time interval is greater than the broadcasting round period and less than the sleep duration period, repeatedly performs: and continuously scanning and receiving synchronous acquisition broadcast messages broadcast by the wireless acquisition gateway, and simultaneously calibrating the local time and the local synchronous acquisition time of the sensor by utilizing the new synchronous acquisition broadcast messages, and storing the updated local time and the updated local synchronous acquisition time.
Any one or a combination of the foregoing technical solutions, further, if a time interval between the current local time and the current local synchronous acquisition time is greater than a sleep duration period, the wireless vibration sensor enters a sleep mode, is woken up again after the sleep duration period passes, and scans and receives a synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway.
The wireless vibration sensor may further scan and receive the synchronous acquisition broadcast message broadcast by the wireless acquisition gateway, where the number of times of execution of the synchronous acquisition broadcast message may be one or more times until a time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcast round period.
Any one or a combination of the foregoing, further wherein calibrating the respective sensor local time or updating the local synchronous acquisition time with the timestamp in the synchronous acquisition broadcast message further includes:
the wireless vibration sensor compares the sensor local time t 1 And the timestamp T 1 If the local time t 1 Less than the time stamp T 1 Or the local time t 1 Subtracting the time stamp T 1 If the difference value of the sensor is larger than the preset time difference value threshold value, calibrating the local time of the sensor, so that the calibrated local time of the sensor is the time stamp T 1 ；
If the local time t 1 Greater than or equal to the time stamp T 1 And the local time t 1 Subtracting the time stamp T 1 If the difference value of the local synchronization acquisition time is smaller than or equal to the preset time difference value threshold value, updating the local synchronization acquisition time to be t s ＝T s +t 1 -T 1 Wherein t is s For updated local synchronous acquisition time, T s To synchronously acquire the synchronous acquisition time in the broadcast message, t 1 For the sensor local time, T 1 The time stamps in the broadcast messages are collected for synchronization.
Any one or a combination of the foregoing, further wherein calibrating the sensor local time and the local synchronous acquisition time with the new synchronous acquisition broadcast message further includes:
the wireless vibration sensor is calibrated with local synchronous acquisition time as follows: t' s ＝t 1 +(t s -t 1 )*(t 2 -t 1 )/(T 2 -T 1 ) Wherein t' s For the calibrated local synchronous acquisition time, t s To locally synchronize acquisition time before calibration, t 1 For the local time of the sensor when the synchronous acquisition broadcast message is received for the first time, t 2 For the local time of the sensor when receiving a new synchronous acquisition broadcast message, T 1 For the first time received the time stamp in the synchronous acquisition broadcast message, T 2 Collecting broadcast messages for new synchronizationIs a time stamp of (2);
the wireless vibration sensor calibration sensor local time is as follows: t is t 2 ＝T 2 Wherein t is 2 For the calibrated sensor local time, T 2 The time stamps in the broadcast message are collected for the new synchronization.
Any one or a combination of the above-mentioned technical solutions, further, the wireless vibration sensor calibrates the local time of the sensor first, and calibrates the local synchronous acquisition time later;
if the local synchronous acquisition time is not updated when the synchronous acquisition broadcast message is received for the first time, the local synchronous acquisition time before calibration is the synchronous acquisition time in the synchronous acquisition broadcast message.
Any one or a combination of the above technical solutions, further, the synchronous acquisition broadcast message further includes a preset synchronous acquisition sampling point number, and the corresponding wireless vibration sensor starts to perform data acquisition until the acquired sampling point number meets the synchronous acquisition sampling point number in the synchronous acquisition broadcast message.
Any one or a combination of the foregoing technical solutions, further, the synchronously collecting the broadcast message further includes a broadcast sequence number of the current message, the data packet that is point-to-point connected by the wireless collecting gateway and the wireless vibration sensor includes a connection sequence number, and the broadcast sequence number and the connection sequence number are respectively counted to determine whether there is a packet loss in data transmission between the wireless collecting gateway and the wireless vibration sensor.
Any one or a combination of the above-mentioned technical solutions, further, before completing data acquisition, the wireless vibration sensor does not perform a reply confirmation operation;
the preset broadcasting round period is set to be less than 500.1ms, or set to be less than 300.1ms, or set to be less than 200.1ms, or set to be less than 150.1ms, or set to be less than 100.1ms.
According to another aspect of the invention, a vibration monitoring system is provided, which comprises a monitoring and diagnosis device and the vibration data wireless synchronous acquisition system, wherein the monitoring and diagnosis device issues a synchronous acquisition instruction to a wireless acquisition gateway of the vibration data wireless synchronous acquisition system.
Any one or a combination of the foregoing aspects, further, the wireless acquisition gateway includes a data uploading module configured to upload vibration data synchronously acquired by a plurality of wireless vibration sensors to the monitoring and diagnosing device;
the monitoring and diagnosing device comprises a data analysis module, wherein the data analysis module is configured to analyze vibration data uploaded by the wireless acquisition gateway to determine whether mechanical equipment generating the vibration data has faults.
The technical scheme provided by the invention has the following beneficial effects:
a. the synchronous acquisition is carried out by utilizing wireless broadcasting without adding a GPS chip or other hardware, for wireless transmission, the speed of electromagnetic waves is close to the light speed, the information transmission time can be ignored, and the synchronous acquisition information is issued in a wireless broadcasting mode, so that the air time of the information received by all wireless vibration sensors is completely the same, and the difference is that the processing time of the information in different wireless vibration sensors is possibly different, therefore, the synchronous acquisition information of the wireless broadcasting is more accurate in time synchronization than the connected bidirectional information;
b. the wireless acquisition gateway transmits a synchronous acquisition message once every other broadcasting interval, so that more machines can receive instructions when part of sensors do not receive the information due to interference or poor signal quality, and the problems that the calculation accuracy is affected and even synchronous acquisition can not be completed after packet loss similar to CN110366240A are avoided;
c. The sensor only receives the synchronous acquisition broadcast message issued by the wireless acquisition gateway, does not need to reply and confirm to the server, and has simpler processing, higher efficiency and more accurate time synchronization;
d. by adopting a mode of synchronous acquisition of the information by unidirectional wireless broadcasting, even if part of sensors have poor signal quality, abnormal operation or no electricity and other conditions, other sensors can synchronously acquire without interference;
e. the wireless vibration sensor receives the broadcast message for many times by transmitting the message sequence number and the time stamp information in the synchronous acquisition broadcast packet, and the time error between the sensor and the wireless acquisition gateway due to different clocks can be better weakened by calculating and adjusting the local time of the sensor and the required synchronous acquisition time by utilizing the difference between the time stamp of the wireless acquisition gateway and the local time of the sensor.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic block diagram of a wireless synchronous acquisition system for vibration data provided by an exemplary embodiment of the present invention;
FIG. 2 is a flow chart of a wireless synchronous acquisition method for vibration data according to an exemplary embodiment of the present invention;
fig. 3 is a flowchart of a wireless synchronous acquisition method of vibration data according to still another exemplary embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or device.
The synchronous acquisition is a necessary means for phase analysis, order spectrum, angular domain diagram and the like in vibration analysis and diagnosis, and in order to overcome the problems of wiring and construction trouble existing in a wired connection mode, wireless sensors are increasingly favored.
The scheme for realizing wireless synchronous acquisition of vibration data by utilizing a broadcasting mode, which may exist at present, is to set time calibration information in a broadcasting data packet, send the time calibration information to a plurality of sensors so as to calculate respective time offset, and calibrate respective sampling timers by utilizing the time offset, which is equivalent to unifying time scales of the plurality of sensors at present and reduce time difference of asynchronous acquisition to a certain extent. But this solution does not solve the problems that can occur in the following cases: the set synchronous acquisition time interval is still in a period of time, whether the sampling timer after the respective calibration of the plurality of sensors can still have satisfactory synchronous precision after a period of time passes or not can not be ensured, and therefore, high requirements are put on the consistency of the working performance of each sensor; and even if the sensors have no difference, it is difficult to ensure whether signal interference occurs before the timing time of the sampling timer is reached, so that synchronous acquisition cannot be performed, and therefore, the synchronization of data acquisition cannot be ensured by the current scheme.
In one embodiment of the present invention, a wireless synchronous acquisition method for vibration data is provided, as shown in fig. 3, and synchronous data acquisition of a plurality of wireless vibration sensors is performed without a GPS chip by:
periodically broadcasting and transmitting synchronous acquisition broadcast messages to a plurality of wireless vibration sensors at each preset broadcasting round, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and time stamps of current messages, and the synchronous acquisition time is later than the time stamps;
specifically, the synchronous acquisition broadcast message may be sent by a wireless acquisition gateway as shown in fig. 1 in a broadcast manner, and in one possible embodiment, the wireless acquisition gateway is in communication with an upper layer system (such as an on-line monitoring and fault diagnosis device of the device in fig. 1, hereinafter referred to as a monitoring and diagnosis device) so as to be capable of receiving a synchronous acquisition instruction, where the synchronous acquisition instruction includes a synchronous acquisition time and identification numbers of a plurality of wireless vibration sensors that need synchronous acquisition; the wireless acquisition gateway responds to the synchronous acquisition instruction, and periodically broadcasts and transmits synchronous acquisition broadcast messages at intervals of preset broadcast rounds, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a time stamp of a current message, and the synchronous acquisition time is later than the time stamp; and the wireless acquisition gateway wakes up a plurality of corresponding wireless vibration sensors according to the identification number information in the synchronous acquisition instruction. The set value of the broadcast round period may be 500ms, or 300ms, or 200ms, or 150ms, or 100ms. In the following embodiments, 200ms is used as a broadcast round period, and the wireless acquisition gateway issues a synchronous acquisition broadcast message every 200ms, so that it can be ensured that some sensors can receive more instructions when the interference or signal quality is poor, and therefore the situation that the calculation accuracy is affected after packet loss is avoided, and even synchronous acquisition cannot be completed is avoided.
Obviously, in another possible embodiment, the identification number of the wireless vibration sensor may not be defined in the synchronous acquisition instruction, so that all wireless vibration sensors need to be awakened and synchronously acquired by default.
The awakened wireless vibration sensors scan and receive the synchronous acquisition broadcast message;
each wireless vibration sensor stores a synchronous acquisition broadcast Message (denoted as Message 1) received for the first time after the wireless vibration sensor wakes up, and uses a timestamp in the synchronous acquisition broadcast Message to calibrate the local time of the respective sensor or update the local synchronous acquisition time, which is specifically as follows:
wireless vibration sensor compares sensor local time t 1 And the timestamp T 1 If the local time t 1 Less than (earlier than) the time stamp T 1 Or the local time t 1 Subtracting the time stamp T 1 Is greater than a predetermined time difference threshold (e.g., t 1 -T 1 > 6 microseconds), then calibrate the sensor local time t 1 So that the local time of the calibrated sensor is the time stamp, namely t 1 ＝T 1 ；
If the local time t 1 Greater than or equal to the time stamp T 1 And the local time t 1 Subtracting the time stamp T 1 If the difference value of the local synchronization acquisition time is smaller than or equal to the preset time difference value threshold value, updating the local synchronization acquisition time to be t s ＝T s +t 1 -T 1 Wherein t is s For updated local synchronous acquisition time, T s To synchronously acquire the synchronous acquisition time in the broadcast message, t 1 For the sensor local time, T 1 The time stamps in the broadcast messages are collected for synchronization. If the local synchronous acquisition time is not updated when the synchronous acquisition broadcast message is received for the first time, the local synchronous acquisition time is the synchronous acquisition time in the synchronous acquisition broadcast message, namely t s ＝T s 。
Each wireless vibration sensor compares the current local time t 1 Time t is acquired synchronously with the current time s If the time interval is greater than the broadcast round period (200 ms for example), t s -t 1 Continuing scanning to receive the synchronous acquisition broadcast message and simultaneously utilizingThe new synchronous acquisition broadcast Message (denoted as Message 2) is used for calibrating the sensor local time and the local synchronous acquisition time, and the updated local time and the updated local synchronous acquisition time are stored, specifically as follows:
the sensor local time may be calibrated first: the wireless vibration sensor is calibrated with local synchronous acquisition time as follows: t' s ＝t 1 +(t s -t 1 )*(t 2 -t 1 )/(T 2 -T 1 ) Wherein t' s For the calibrated local synchronous acquisition time, t s To locally synchronize acquisition time before calibration, t 1 For the local time of the sensor when the synchronous acquisition broadcast message is received for the first time, t 2 For the local time of the sensor when receiving a new synchronous acquisition broadcast message, T 1 For the first time received the time stamp in the synchronous acquisition broadcast message, T 2 Collecting a time stamp in the broadcast message for the new synchronization;
recalibrating the local sync acquisition time: the wireless vibration sensor calibration sensor local time is as follows: t is t 2 ＝T 2 Wherein t is 2 For the calibrated sensor local time, T 2 The time stamps in the broadcast message are collected for the new synchronization.
As shown in fig. 3, at the local time t after the second storage update 1 And local synchronous acquisition time t s And then, the wireless vibration sensor continuously compares the current local time with the current local synchronous acquisition time, and if the time interval is larger than the broadcasting round period and smaller than the sleep duration period (for example, the wireless vibration sensor automatically wakes up after going into sleep for 5 minutes each time, the sleep duration period is 10 s), the wireless vibration sensor repeatedly executes the following steps: and continuously scanning and receiving synchronous acquisition broadcast messages broadcast by the wireless acquisition gateway, and simultaneously calibrating the local time and the local synchronous acquisition time of the sensor by utilizing the new synchronous acquisition broadcast messages, and storing the updated local time and the updated local synchronous acquisition time until the time interval between the local time and the local synchronous acquisition time is smaller than or equal to the broadcasting round period.
If the time interval between the current local time and the current local synchronous acquisition time is greater than the sleep duration period, the wireless vibration sensor enters a sleep mode, and is automatically awakened or awakened again after the sleep duration period passes, and the above scanning after awakening is repeatedly executed, and the synchronous acquisition broadcast message broadcast by the wireless acquisition gateway is received for the first time and the subsequent steps.
After vibration data acquisition and uploading are completed, the wireless vibration sensor in the embodiment wakes up to enter the next acquisition and uploading work after entering the deep sleep mode for a specified time, and therefore battery consumption can be saved.
When the time interval between the current local time and the current synchronous acquisition time is smaller than or equal to the broadcasting round period (namely less than one broadcasting interval), each wireless vibration sensor stops receiving the broadcasting message and starts a timer to time until the current latest local synchronous acquisition time is reached, and the corresponding wireless vibration sensor starts data acquisition.
In a specific embodiment, the synchronous acquisition broadcast message further includes a preset synchronous acquisition sampling point number, and the corresponding wireless vibration sensor starts data acquisition until the acquired sampling point number meets the synchronous acquisition sampling point number in the synchronous acquisition broadcast message, and at this time, data acquisition is stopped, and then the wireless vibration sensor can be connected to a wireless acquisition gateway and can package and send data to the wireless acquisition gateway.
The synchronous acquisition broadcast message in one embodiment further comprises a broadcast sequence number of the current message, the data packet of the point-to-point connection of the wireless acquisition gateway and the wireless vibration sensor comprises a connection sequence number, and the broadcast sequence number and the connection sequence number are respectively counted to determine whether packet loss exists in data transmission between the wireless acquisition gateway and the wireless vibration sensor.
Because the broadcast data is sent to the wireless vibration sensor in a broadcast mode, the wireless vibration sensor does not carry out reply confirmation operation before completing data acquisition, so that the processing is simpler, the efficiency is higher, and the time synchronization is more accurate.
The time of synchronous acquisition and the moment of the last time of receiving the broadcast message and calibrating the time by the sensor are within 200ms, the error of the synchronous acquisition time after time calibration is within a plurality of microseconds, and the synchronous acquisition time can reach within 10us seconds under an ideal working state, thereby realizing high synchronous data acquisition.
In one embodiment of the present invention, as shown in fig. 2, the vibration data wireless synchronous acquisition method is different from the above embodiment in that after continuing to scan and receive the synchronous acquisition broadcast Message (denoted as Message 2), and calibrating and storing the sensor local time and the local synchronous acquisition time, the sleep is not considered, but at t s -t 1 And under the condition of more than 200000 microseconds, repeatedly executing scanning to receive the synchronous acquisition broadcast messages Message3 and Message4 … …, namely, the number of times of executing the synchronous acquisition broadcast messages which are continuously scanned and received by the wireless acquisition gateway by the wireless vibration sensor can be multiple times until the time interval between the current local time and the current synchronous acquisition time is smaller than or equal to the broadcasting round period.
In one embodiment of the present invention, unlike the above-described embodiment, the broadcasting is not in the form of periodically transmitting the synchronous acquisition broadcasting data as described above, but is a one-time synchronous acquisition instruction in which the time to perform the synchronous acquisition action is designated, and after issuing the one-time synchronous acquisition instruction, the wireless vibration sensor starts synchronous acquisition at the designated time.
In one embodiment of the present invention, a vibration monitoring system is provided, as shown in fig. 1, where the monitoring system includes an on-line device monitoring and fault diagnosis apparatus (hereinafter referred to as a monitoring diagnosis apparatus), and a vibration data wireless synchronous acquisition system as described above, where the monitoring diagnosis apparatus issues a synchronous acquisition instruction to a wireless acquisition gateway of the vibration data wireless synchronous acquisition system.
As shown in fig. 1, the wireless acquisition gateway comprises a sensor control module, a data receiving module and a data uploading module, wherein the sensor control module is responsible for receiving a control instruction issued by a monitoring and diagnosing device and carrying out parameter setting and acquisition control on a sensor according to the instruction; the data receiving module receives data acquired by the wireless vibration sensor; the data uploading module is responsible for packaging and uploading the data packets to the monitoring and diagnosis device.
The monitoring and diagnosing device comprises a collection control module, a data storage module and a data analysis module, wherein the collection control module is used for carrying out parameter setting and collection control on the wireless collection gateway and the wireless vibration sensor, the data storage module is responsible for receiving vibration data uploaded by the wireless collection gateway and carrying out grouping storage, and the data analysis module is responsible for analyzing the vibration data by utilizing tools such as signal processing and the like and judging whether mechanical equipment has faults or not.
In mechanical equipment fault diagnosis application, the collection of sensing data must have synchronism to ensure the accuracy of diagnosis results, and in such application scenario, the wireless vibration sensor is only controlled to perform synchronous collection according to the test frequency, for example, the collection is set to be performed once every 4 hours, and real-time collection is not required in the operation process of mechanical equipment. By adopting the scheme of the invention, the synchronous acquisition time can be flexibly set by using the upper layer system and the synchronous acquisition instruction can be issued, for example, the synchronous acquisition time is set to a plurality of time points with 4 hours intervals in the form of a configuration file, then the next time point can be automatically changed to be the synchronous acquisition time after the timing reaches the first time point, in the 4 hours, the wake-up working time of the actual sensor is relatively short by combining the calibration and dormancy, the energy is greatly saved, and more importantly, the sampling timer is started to time within the time range of one broadcasting interval no matter the time difference of the current time of the set synchronous acquisition time interval, so that the synchronous acquisition time error of a plurality of sensors after time calibration is within a plurality of microseconds.
The interface 1 between the wireless vibration sensor and the wireless acquisition gateway can be zigbee or Bluetooth wireless, and the interface 2 between the wireless acquisition gateway and the monitoring and diagnosis device can be Ethernet, wiFi or 3G/4G/5G mobile network.
According to the invention, a GPS chip or other hardware is not required to be added, synchronous acquisition is performed by utilizing wireless broadcasting, for wireless transmission, the speed of electromagnetic waves is close to the light speed, the information transmission time is negligible, and a wireless broadcasting mode is adopted to send out synchronous acquisition information, so that the air time of the information received by all wireless vibration sensors is identical, the difference is that the processing time of the information in different wireless vibration sensors is possibly different, and for the same type of wireless vibration sensors, the processing logic and instructions after the information is received are identical as long as the operating clock frequency is identical, so that the time of the information received by different wireless vibration sensors is identical, and therefore, the synchronous acquisition information of the wireless broadcasting is more accurate in time synchronization than the connected bidirectional information; even for different types of wireless vibration sensors, the local time and the required synchronous acquisition time can be corrected by the time stamp information transmitted in the broadcast data, and the time error occurring between the sensor and the wireless acquisition gateway due to the different clocks can be better eliminated or reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely illustrative of the embodiments of this application and it will be appreciated by those skilled in the art that variations and modifications may be made without departing from the principles of the application, and it is intended to cover all modifications and variations as fall within the scope of the application.
Claims (10)
1. The wireless synchronous acquisition method of vibration data is characterized in that synchronous data acquisition of a plurality of wireless vibration sensors is carried out under the condition of no need of a GPS chip by the following steps:
periodically broadcasting and transmitting synchronous acquisition broadcast messages to a plurality of wireless vibration sensors at each preset broadcasting round, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and time stamps of current messages, and the synchronous acquisition time is later than the time stamps;
the awakened wireless vibration sensor scans and receives the synchronous acquisition broadcast message;
each wireless vibration sensor stores a synchronous acquisition broadcast message received for the first time after the wireless vibration sensor wakes up, and uses a time stamp in the synchronous acquisition broadcast message to calibrate the local time of the respective sensor or update the local synchronous acquisition time;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is larger than the broadcasting round period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcast message, meanwhile, the local time and the local synchronous acquisition time of the sensors are calibrated by utilizing the new synchronous acquisition broadcast message, and the updated local time and the local synchronous acquisition time are stored;
If the time interval between the current local time and the current synchronous acquisition time is smaller than or equal to the broadcasting round period, each wireless vibration sensor stops receiving the broadcasting message and starts a timer to time until the current latest local synchronous acquisition time is reached, and the corresponding wireless vibration sensor starts to acquire data.
2. The wireless synchronous acquisition system for vibration data comprises a wireless acquisition gateway and a plurality of wireless vibration sensors, wherein the wireless acquisition gateway is configured to receive data acquired by the wireless vibration sensors, and is characterized in that the synchronous data acquisition of the plurality of wireless vibration sensors is carried out under the condition that a GPS chip is not needed by the wireless acquisition gateway through the following steps:
the wireless acquisition gateway receives a synchronous acquisition instruction issued by an upper layer system, wherein the synchronous acquisition instruction comprises synchronous acquisition time and identification numbers of a plurality of wireless vibration sensors needing synchronous acquisition;
the wireless acquisition gateway responds to the synchronous acquisition instruction, and periodically broadcasts and transmits synchronous acquisition broadcast messages at intervals of preset broadcast rounds, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a time stamp of a current message, and the synchronous acquisition time is later than the time stamp;
The wireless acquisition gateway wakes up a plurality of corresponding wireless vibration sensors according to the identification number information in the synchronous acquisition instruction, and the wakened wireless vibration sensors scan and receive synchronous acquisition broadcast messages broadcast by the wireless acquisition gateway;
each wireless vibration sensor stores a synchronous acquisition broadcast message received for the first time after the wireless vibration sensor wakes up, and uses a time stamp in the synchronous acquisition broadcast message to calibrate the local time of the respective sensor or update the local synchronous acquisition time;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is larger than the broadcasting round period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway, and meanwhile calibrate the local time and the local synchronous acquisition time of the sensors by utilizing the new synchronous acquisition broadcast message, and store the updated local time and the local synchronous acquisition time;
if the time interval between the current local time and the current synchronous acquisition time is smaller than or equal to the broadcasting round period, each wireless vibration sensor stops receiving the broadcasting message and starts a timer to time until the current latest local synchronous acquisition time is reached, and the corresponding wireless vibration sensor starts to acquire data.
3. The wireless synchronous acquisition system of vibration data according to claim 2, wherein after storing the updated local time and the local synchronous acquisition time, the wireless vibration sensor continues to compare the current local time with the current local synchronous acquisition time, and if the time interval is greater than the broadcast round period and less than the sleep duration period, the wireless vibration sensor repeatedly performs: and continuously scanning and receiving synchronous acquisition broadcast messages broadcast by the wireless acquisition gateway, and simultaneously calibrating the local time and the local synchronous acquisition time of the sensor by utilizing the new synchronous acquisition broadcast messages, and storing the updated local time and the updated local synchronous acquisition time.
4. The vibration data wireless synchronous acquisition system according to claim 3, wherein if the time interval between the current local time and the current local synchronous acquisition time is greater than a sleep duration period, the wireless vibration sensor enters a sleep mode, wakes up again after the sleep duration period, and scans and receives a synchronous acquisition broadcast message broadcast by the wireless acquisition gateway.
5. The wireless synchronous acquisition system of vibration data according to claim 2, wherein the number of times the wireless vibration sensor continues to scan and receive the synchronous acquisition broadcast message broadcast by the wireless acquisition gateway may be one or more times until the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcast round period.
6. The vibration data wireless synchronous acquisition system according to claim 2, wherein the time stamp T in the synchronous acquisition broadcast message is utilized 1 To calibrate the respective sensor local time t 1 Or update the local synchronous acquisition time t s Further comprises:
the wireless vibration sensor compares the sensor local time t 1 And the timestamp T 1 If the local time t 1 Less than the time stamp T 1 Or the local time t 1 Subtracting the time stamp T 1 If the difference value of the sensor is larger than a preset time difference value threshold value, calibrating the local time of the sensor so that the calibrated sensor transmitsThe local time of the sensor is the time stamp T 1 ；
If the local time t 1 Greater than or equal to the time stamp T 1 And the local time t 1 Subtracting the time stamp T 1 If the difference value of the local synchronization acquisition time is smaller than or equal to the preset time difference value threshold value, updating the local synchronization acquisition time to be t s ＝T s +t 1 -T 1 Wherein t is s For updated local synchronous acquisition time, T s To synchronously acquire the synchronous acquisition time in the broadcast message, t 1 For the sensor local time, T 1 The time stamps in the broadcast messages are collected for synchronization.
7. The wireless synchronous acquisition system of vibration data according to claim 2, wherein calibrating the sensor local time and the local synchronous acquisition time with the new synchronous acquisition broadcast message further comprises:
The wireless vibration sensor is calibrated with local synchronous acquisition time as follows: t' s ＝t 1 +(t s -t 1 )*(t 2 -t 1 )/(T 2 -T 1 ) Wherein t' s For the calibrated local synchronous acquisition time, t s To locally synchronize acquisition time before calibration, t 1 For the local time of the sensor when the synchronous acquisition broadcast message is received for the first time, t 2 For the local time of the sensor when receiving a new synchronous acquisition broadcast message, T 1 For the first time received the time stamp in the synchronous acquisition broadcast message, T 2 Collecting a time stamp in the broadcast message for the new synchronization;
the wireless vibration sensor calibration sensor local time is as follows: t is t 2 ＝T 2 Wherein t is 2 For the calibrated sensor local time, T 2 The time stamps in the broadcast message are collected for the new synchronization.
8. The wireless synchronous acquisition system of vibration data according to claim 2, wherein the wireless vibration sensor calibrates the sensor local time first and calibrates the local synchronous acquisition time later;
if the local synchronous acquisition time is not updated when the synchronous acquisition broadcast message is received for the first time, the local synchronous acquisition time before calibration is the synchronous acquisition time in the synchronous acquisition broadcast message.
9. The wireless synchronous acquisition system of vibration data according to claim 2, wherein the synchronous acquisition broadcast message further comprises a preset synchronous acquisition sampling point number, and the corresponding wireless vibration sensor starts data acquisition until the acquired sampling point number meets the synchronous acquisition sampling point number in the synchronous acquisition broadcast message; and/or the number of the groups of groups,
The synchronous acquisition broadcast message further comprises a broadcast sequence number of the current message, the data packet of the point-to-point connection of the wireless acquisition gateway and the wireless vibration sensor comprises a connection sequence number, and the broadcast sequence number and the connection sequence number are respectively counted to determine whether packet loss exists in data transmission between the wireless acquisition gateway and the wireless vibration sensor.
10. A vibration monitoring system, characterized by comprising a monitoring and diagnosis device and a vibration data wireless synchronous acquisition system according to any one of claims 2 to 9, wherein the monitoring and diagnosis device issues a synchronous acquisition instruction to a wireless acquisition gateway of the vibration data wireless synchronous acquisition system; the wireless acquisition gateway comprises a data uploading module, wherein the data uploading module is configured to upload vibration data synchronously acquired by a plurality of wireless vibration sensors to the monitoring and diagnosis device;
the monitoring and diagnosing device comprises a data analysis module, wherein the data analysis module is configured to analyze vibration data uploaded by the wireless acquisition gateway to determine whether mechanical equipment generating the vibration data has faults.
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