CN115038161A - Vibration data wireless synchronous acquisition method and system and vibration monitoring system - Google Patents
Vibration data wireless synchronous acquisition method and system and vibration monitoring system Download PDFInfo
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- 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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- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
The invention discloses a vibration data wireless synchronous acquisition method, a system and a vibration monitoring system, wherein the method comprises the following steps: periodically broadcasting and sending synchronous acquisition broadcast messages to a plurality of wireless vibration sensors, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and timestamps 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 is awakened, and the local time or the local synchronous acquisition time of each sensor is calibrated by utilizing the timestamp of the synchronous acquisition broadcast message; each sensor compares that the time interval between the two is greater than the broadcast period, and then the synchronous acquisition broadcast message is continuously received so as to calibrate and store the local time of the sensor and the local synchronous acquisition time; and if the time interval between the two is less than or equal to the broadcast period, stopping receiving the broadcast message by each sensor, starting timing, and starting data acquisition by the sensors 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 vibration data wireless synchronous acquisition method and system and a vibration monitoring system.
Background
The vibration monitoring and vibration analysis are the most common and effective methods for monitoring the fault running state and diagnosing the fault of the rotary mechanical equipment, and the data transmission modes of a sensor for acquiring vibration data and an acquisition terminal are wired or wireless, wherein the wired transmission mode can set a shorter acquisition interval and a longer data length, can easily realize synchronous acquisition, and has the problem of troublesome wiring and construction; the wireless transmission mode does not need wiring, is simple to install, but has longer acquisition time interval and limited data length due to the fact that the battery power consumption and the direct control cannot be realized.
Compared with the wired transmission method, the wireless transmission method has a great difficulty in realizing synchronous acquisition.
The synchronization method between the wireless sensor and the acquisition terminal is usually a GPS clock synchronization method and a protocol synchronization method, wherein the GPS clock synchronization method needs to additionally increase a GPS chip and needs to additionally increase the power consumption and the cost; the protocol synchronization method, as disclosed in chinese patent application with publication number CN110366240A, proposes a method in which a sensor and each acquisition node calculate the transmission time of each sensor link through the command transmission and reply time difference of a one-way passing link, then calculate time compensation according to the transmission time of all sensors, and sequentially transmit synchronous acquisition commands according to the compensation time sequence for synchronous acquisition, which has the defects that when the number of sensor nodes is large, the network signal is poor or seriously interfered, especially when zigbee is in a 2.4G frequency band shared by WiFi and bluetooth, it is easily interfered by mobile phones and WiFi routers, resulting in poor wireless signal quality, resulting in wireless packet loss, and since packet loss has randomness, the calculated transmission time delay is likely to affect the accuracy of synchronous acquisition. In addition, when a plurality of sensor nodes are provided, each sensor is connected in sequence and sends a synchronous acquisition command, which may require a long time to affect the synchronous acquisition effect, and even if one or more sensors cannot be successfully connected due to low battery voltage and other reasons, the synchronous acquisition effect may be affected.
The above background disclosure is only used for assisting understanding of the inventive concept and technical solutions of the present invention, 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 inventive aspects of the present application in the absence of express evidence that the above disclosure is published prior to the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a vibration data wireless synchronous acquisition method and system without a GPS chip, which can achieve microsecond-level synchronous acquisition effect by utilizing a wireless broadcast protocol.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a vibration data wireless synchronous acquisition method is characterized in that synchronous data acquisition of a plurality of wireless vibration sensors is carried out through the following steps without a GPS chip:
periodically broadcasting and sending synchronous acquisition broadcast messages to a plurality of wireless vibration sensors at preset broadcasting turn intervals, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a timestamp of a current message, and the synchronous acquisition time is later than the timestamp;
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 is awakened, and uses a timestamp in the synchronous acquisition broadcast message to calibrate the local time of each 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 greater than the broadcasting cycle period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcasting message, simultaneously calibrate the local time of the sensor and the local synchronous acquisition time by using the new synchronous acquisition broadcasting message, and store the updated local time and the updated local synchronous acquisition time;
and if the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcasting cycle period, stopping receiving the broadcasting message by each wireless vibration sensor, starting a timer for timing until the current latest local synchronous acquisition time is reached, and starting data acquisition by the corresponding wireless vibration sensor.
In accordance with any one or a combination of multiple foregoing technical solutions, further, after storing the updated local time and 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 turn period and less than the sleep duration period, the following steps are repeatedly performed: and continuing to scan and receive the synchronous acquisition broadcast message, calibrating the local time and the local synchronous acquisition time of the sensor by using the new synchronous acquisition broadcast message, and storing the updated local time and the updated local synchronous acquisition time.
In the foregoing any technical solution or combination of multiple technical solutions, further, 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 the sleep mode, is awakened again after the sleep duration period elapses, and scans and receives the synchronous acquisition broadcast message.
In accordance with any one or a combination of multiple technical solutions described above, further, the number of execution times for the wireless vibration sensor to continue scanning and receive 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 cycle period.
Any one or combination of multiple aspects of the foregoing, further wherein calibrating the respective sensor local time or updating the local synchronous acquisition time using the timestamp in the synchronous acquisition broadcast message further comprises:
the wireless vibration sensor compares the local time of the sensor with the timestamp, and if the local time is smaller than the timestamp and the difference value is larger than a preset time difference value threshold value, the local time of the sensor is calibrated, so that the calibrated local time of the sensor is the timestamp;
otherwise, updating the local synchronous acquisition time to t s ＝T s +t 1 -T 1 Wherein, t s For updated local synchronous acquisition time, T s For synchronous acquisition of synchronous acquisition times, t, in broadcast messages 1 For sensor local time, T 1 Time stamps in the broadcast messages are collected for synchronization.
In accordance with any one or combination of the preceding claims, further calibrating the sensor local time and the local synchronous acquisition time using the new synchronous acquisition broadcast message further comprises:
the calibration local synchronous acquisition time of the wireless vibration sensor is 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 For local synchronous acquisition time before calibration, t 1 For the first time the synchronous acquisition broadcast message is received, the local time of the sensor, t 2 Local time of sensor, T, for receiving a new synchronous acquisition broadcast message 1 Time stamp, T, in synchronous acquisition broadcast message for first reception 2 Collecting a timestamp in the broadcast message for the new synchronization;
the local time for calibrating the sensor by the wireless vibration sensor is as follows: t is t 2 ＝T 2 Wherein, t 2 For calibrated sensor local time, T 2 The timestamp in the broadcast message is collected for the new synchronization.
Based on any one or a combination of multiple technical solutions, further, the wireless vibration sensor calibrates the local time of the sensor first, and then calibrates the local synchronous acquisition time;
and 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.
In accordance with any one or a combination of the foregoing 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 satisfies the synchronous acquisition sampling point number in the synchronous acquisition broadcast message.
According to any one or combination of multiple technical schemes, the wireless vibration sensor does not perform reply confirmation operation before data acquisition is completed;
the preset value of the broadcasting turn period is less than 500.1ms, or the preset value is less than 300.1ms, or the preset value is less than 200.1ms, or the preset value is less than 150.1ms, or the preset value is less than 100.1 ms.
According to another aspect of the present invention, there is provided a vibration data wireless synchronous acquisition system, comprising 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 following steps:
the wireless acquisition gateway receives a synchronous acquisition instruction issued by an upper system, wherein the synchronous acquisition instruction comprises synchronous acquisition time and identification numbers of a plurality of wireless vibration sensors needing to be synchronously acquired;
the wireless acquisition gateway responds to the synchronous acquisition instruction, periodically broadcasts and sends synchronous acquisition broadcast messages at intervals of a preset broadcast turn, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a timestamp of a current message, and the synchronous acquisition time is later than the timestamp;
the wireless acquisition gateway wakes up the corresponding wireless vibration sensors according to the identification number information in the synchronous acquisition instruction, and the awakened wireless vibration sensors scan and receive synchronous acquisition broadcast messages broadcasted by the wireless acquisition gateway;
each wireless vibration sensor stores the synchronous acquisition broadcast message received for the first time after the wireless vibration sensor is awakened, and the local time of each sensor is calibrated or the local synchronous acquisition time is updated by using the timestamp in the synchronous acquisition broadcast message;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is greater than the broadcasting cycle period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcasting messages broadcasted by the wireless acquisition gateway, simultaneously utilize the new synchronous acquisition broadcasting messages to calibrate the local time and the local synchronous acquisition time of the sensor, and store the updated local time and the updated local synchronous acquisition time;
and if the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcasting cycle period, stopping receiving the broadcasting message by each wireless vibration sensor, starting a timer for timing, and starting the corresponding wireless vibration sensor to acquire data until the current latest local synchronous acquisition time is reached.
In accordance with any one or a combination of multiple foregoing technical solutions, further, after storing the updated local time and 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 turn period and less than the sleep duration period, the following steps are repeatedly performed: and continuously scanning and receiving the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway, calibrating the local time and the local synchronous acquisition time of the sensor by using the new synchronous acquisition broadcast message, and storing the updated local time and the updated local synchronous acquisition time.
In the foregoing any technical solution or combination of multiple technical solutions, further, 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 the sleep mode, is awakened again after the sleep duration period elapses, and scans and receives the synchronous acquisition broadcast message broadcast by the wireless acquisition gateway.
In accordance with any one or a combination of multiple technical solutions described above, further, the number of times that 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 a time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcast cycle period.
Any one or combination of multiple aspects of the foregoing, further wherein calibrating the respective sensor local time or updating the local synchronous acquisition time using the timestamp in the synchronous acquisition broadcast message further comprises:
the wireless vibration sensor compares the local time of the sensor with the timestamp, and if the local time is smaller than the timestamp and the difference value is larger than a preset time difference value threshold value, the local time of the sensor is calibrated, so that the calibrated local time of the sensor is the timestamp;
otherwise, updating the local synchronous acquisition time to t s ＝T s +t 1 -T 1 Wherein, t s For updated local synchronous acquisition time, T s For synchronous acquisition of synchronous acquisition time, t, in broadcast messages 1 For sensor local time, T 1 Time stamps in the broadcast messages are collected for synchronization.
In accordance with any one or combination of the preceding claims, further calibrating the sensor local time and the local synchronous acquisition time using the new synchronous acquisition broadcast message further comprises:
the calibration local synchronous acquisition time of the wireless vibration sensor is as follows: t' s ＝t 1 +(t s -t 1 )*(t 2 -t 1 )/(T 2 -T 1 ) Wherein, t' s For calibrated local synchronous acquisition time, t s For the local synchronous acquisition time before calibration, t 1 For the first time the synchronous acquisition broadcast message is received, the local time of the sensor, t 2 Local time of sensor, T, for receiving a new synchronous acquisition broadcast message 1 Time stamp, T, in synchronous acquisition broadcast message for first reception 2 Collecting a timestamp in the broadcast message for the new synchronization;
the local time for calibrating the sensor by the wireless vibration sensor is as follows: t is t 2 ＝T 2 Wherein, t 2 Local to the calibrated sensorTime, T 2 The timestamp in the broadcast message is collected for the new synchronization.
Based on any one or a combination of multiple technical solutions, further, the wireless vibration sensor calibrates the local time of the sensor first, and then calibrates the local synchronous acquisition time;
and 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.
In accordance with any one or a combination of the foregoing 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 satisfies the synchronous acquisition sampling point number in the synchronous acquisition broadcast message.
In accordance with any one or a combination of multiple technical solutions described above, further, the synchronous acquisition broadcast message further includes a broadcast serial number of the current message, the data packet of the point-to-point connection between the wireless acquisition gateway and the wireless vibration sensor includes a connection serial number, and the broadcast serial number and the connection serial number are counted respectively to determine whether there is packet loss in data transmission between the wireless acquisition gateway and the wireless vibration sensor.
According to any one or combination of multiple technical schemes, the wireless vibration sensor does not perform reply confirmation operation before data acquisition is completed;
the preset value of the broadcasting turn cycle is less than 500.1ms, or the preset value is less than 300.1ms, or the preset value is less than 200.1ms, or the preset value is less than 150.1ms, or the preset value is less than 100.1 ms.
According to another aspect of the present invention, a vibration monitoring system is provided, which includes a monitoring and diagnosing device, and the vibration data wireless synchronous acquisition system as described above, wherein the monitoring and diagnosing device issues a synchronous acquisition instruction to a wireless acquisition gateway of the vibration data wireless synchronous acquisition system.
In accordance with any one or a combination of the foregoing technical solutions, 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 apparatus;
the monitoring and diagnosing device comprises a data analysis module which is configured to analyze the vibration data uploaded by the wireless acquisition gateway to determine whether the mechanical equipment generating the vibration data has a fault.
The technical scheme provided by the invention has the following beneficial effects:
a. the wireless vibration sensor synchronous acquisition method has the advantages that a GPS chip or other hardware is not required to be added, synchronous acquisition is carried out by utilizing wireless broadcasting, for wireless transmission, the speed of electromagnetic waves is close to the light speed, the information transmission time can be ignored, synchronous acquisition information is sent in a wireless broadcasting sampling mode, the air time of all wireless vibration sensors receiving the information is identical, and only the processing time of the information in different wireless vibration sensors is possibly different, so that the wireless broadcasting synchronous acquisition information is more accurate in time synchronization than the connected two-way information;
b. the wireless acquisition gateway sends the synchronous acquisition message once at a broadcast interval, so that more opportunities for receiving instructions can be ensured when part of the sensors are not received due to interference or poor signal quality, and the problems that the calculation accuracy is influenced after packet loss similar to CN110366240A occurs, and even synchronous acquisition cannot be completed are avoided;
c. the sensor only receives the synchronous acquisition broadcast message sent by the wireless acquisition gateway, and does not need to reply to a server for confirmation, so that the processing is simpler, the efficiency is higher, and the time synchronization is more accurate;
d. by adopting a one-way wireless broadcast synchronous acquisition message mode, even if some sensors have poor signal quality, abnormal operation or no electricity and the like, other sensors can perform synchronous acquisition without interference;
e. by transmitting the message serial number and the timestamp information in the synchronous acquisition broadcast packet, receiving the broadcast message for multiple times by the wireless vibration sensor, and utilizing the difference between the timestamp of the wireless acquisition gateway and the local time of the sensor, 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.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a vibration data wireless synchronous acquisition system according to an exemplary embodiment of the present invention;
fig. 2 is a schematic flow chart of a vibration data wireless synchronous acquisition method according to an exemplary embodiment of the present invention;
fig. 3 is a flowchart of a vibration data wireless synchronous acquisition method according to yet another exemplary embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or 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, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
The invention discloses a synchronous acquisition method, which is necessary for analysis means such as phase analysis, order spectrum and angle domain diagram in vibration analysis and diagnosis, and aims to provide an improved data synchronous acquisition solution for a wireless vibration sensor, wherein the wireless sensor is increasingly favored in order to overcome the problem of troublesome wiring and construction in a wired connection mode.
The scheme for realizing wireless synchronous acquisition of vibration data by using a broadcasting mode possibly exists 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 offsets, and calibrate respective sampling timers by using the time offsets, which is equivalent to unifying time scales of a plurality of sensors at present, thereby reducing asynchronous acquisition time difference to a certain extent. However, this solution does not solve well the problems that can occur in the following cases: the set synchronous acquisition time has a period of time from the current time, so that whether the sampling timers calibrated by the sensors can have satisfactory synchronous precision after a period of time passes cannot be ensured, and high requirements are put forward on the working performance consistency of the sensors; even if the sensors have no difference, it is difficult to ensure whether signal interference occurs before the timing time of the sampling timer, so that synchronous acquisition cannot be ensured.
In an embodiment of the present invention, a method for wireless and synchronous acquisition of vibration data is provided, as shown in fig. 3, under the condition that a GPS chip is not needed, synchronous data acquisition of a plurality of wireless vibration sensors is performed through the following steps:
periodically broadcasting and sending synchronous acquisition broadcast messages to a plurality of wireless vibration sensors at preset broadcasting turns, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a timestamp of a current message, and the synchronous acquisition time is later than the timestamp;
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 communicatively connected to an upper system (such as the device online monitoring and fault diagnosis device in fig. 1, hereinafter referred to as a monitoring and diagnosis device) to be capable of receiving a synchronous acquisition instruction, where the synchronous acquisition instruction includes synchronous acquisition time and identification numbers of a plurality of wireless vibration sensors that need to be synchronously acquired; the wireless acquisition gateway responds to the synchronous acquisition instruction, periodically broadcasts and sends synchronous acquisition broadcast messages at intervals of a preset broadcast turn, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a timestamp of a current message, and the synchronous acquisition time is later than the timestamp; and the wireless acquisition gateway awakens the corresponding wireless vibration sensors according to the identification number information in the synchronous acquisition instruction. The set value of the broadcast turn period may be 500ms, or 300ms, or 200ms, or 150ms, or 100 ms. In the following embodiments, 200ms is used as a broadcast turn period, and the wireless acquisition gateway issues a synchronous acquisition broadcast message every 200ms, so that it can be ensured that some sensors may receive instructions more times when no signal is received due to interference or poor signal quality, thereby avoiding the situation that calculation accuracy is affected after packet loss occurs, and even synchronous acquisition may not be completed.
Obviously, in another possible embodiment, the identification number of the wireless vibration sensor may not be defined in the synchronous acquisition command, so that it is default that all the wireless vibration sensors need to be woken up and perform synchronous acquisition.
The plurality of awakened wireless vibration sensors scan and receive the synchronous acquisition broadcast message;
each wireless vibration sensor stores a synchronous acquisition broadcast Message (denoted as Message1) received for the first time after the wireless vibration sensor wakes up, and calibrates the local time of each sensor or updates the local synchronous acquisition time by using a timestamp in the synchronous acquisition broadcast Message, which is specifically as follows:
wireless vibration sensor comparison sensor local time t 1 And said time stamp T 1 If the local time t is 1 Less than (earlier than) the timestamp T 1 And the difference is greater than a predetermined time difference threshold (e.g., t) 1 -T 1 > 6 microseconds), the sensor local time t is calibrated 1 So that the calibrated local time of the sensor is the time stamp, i.e. t 1 ＝T 1 ；
Otherwise, updating the local synchronous acquisition time to t s ＝T s +t 1 -T 1 Wherein, t s For updated local synchronous acquisition time, T s For synchronous acquisition of synchronous acquisition times, t, in broadcast messages 1 For sensor local time, T 1 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 Acquisition time t synchronized with the current s If the time interval is larger than the broadcasting turn period (200 ms for example), t is s -t 1 If the time is more than 200000 microseconds, the synchronous acquisition broadcast Message is continuously scanned and received, and meanwhile, the local time and the local synchronous acquisition time of the sensor are calibrated by using a new synchronous acquisition broadcast Message (denoted as Message2), and the updated local time and the updated local synchronous acquisition time are stored, which specifically includes the following steps:
the sensor local time may be calibrated first: the calibration local synchronous acquisition time of the wireless vibration sensor is 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 For the local synchronous acquisition time before calibration, t 1 For the first time the synchronous acquisition broadcast message is received, the local time of the sensor, t 2 Local time of sensor, T, for receiving a new synchronous acquisition broadcast message 1 Time stamp, T, in synchronous acquisition broadcast message for first reception 2 Collecting a timestamp in the broadcast message for the new synchronization;
recalibrating the local synchronous acquisition time: the local time for calibrating the sensor by the wireless vibration sensor is as follows: t is t 2 ＝T 2 Wherein, t 2 For calibrated local time of the sensor, T 2 The timestamp in the broadcast message is collected for the new synchronization.
As shown in FIG. 3, the updated local time t is stored for the second time 1 And local synchronous acquisition time t s Then, 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 broadcast turn period and smaller than the sleep duration period (for example, the sleep duration period is 10s if the wireless vibration sensor automatically wakes up after continuously going to sleep for 5 minutes each time), the following steps are repeatedly performed: and continuing to scan and receive the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway, calibrating the local time and the local synchronous acquisition time of the sensor by using the new synchronous acquisition broadcast message, and storing the updated local time and the updated local synchronous acquisition time until the time interval between the local time and the updated local synchronous acquisition time is less than or equal to the broadcast cycle period.
And if the time interval between the current local time and the current local synchronous acquisition time is greater than the dormancy duration period, the wireless vibration sensor enters a dormancy mode, automatically wakes up or wakes up again after the dormancy duration period, and repeatedly executes the wake-up scanning and receives the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway for the first time and the subsequent steps.
After the wireless vibration sensor of the embodiment finishes the acquisition and the uploading of the vibration data, the wireless vibration sensor enters a deep sleep mode for a specified time and then is awakened to enter the next acquisition and uploading work, so that the battery consumption can be saved.
When the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcasting cycle period (namely, less than one broadcasting interval), each wireless vibration sensor stops receiving the broadcasting message, and starts a timer to carry out timing until the current latest local synchronous acquisition time is reached, and then the corresponding wireless vibration sensor starts to carry out data acquisition.
In a specific embodiment, the synchronous acquisition broadcast message further includes a preset synchronous acquisition sampling point number, the corresponding wireless vibration sensor starts to perform data acquisition until the sampling point number acquired by the corresponding wireless vibration sensor meets the synchronous acquisition sampling point number in the synchronous acquisition broadcast message, at this time, the data acquisition is stopped, and then the wireless vibration sensor can be connected to the wireless acquisition gateway and can transmit the data to the wireless acquisition gateway in a packed manner.
In an embodiment, the synchronous acquisition broadcast message further includes a broadcast sequence number of the current message, the data packet of the point-to-point connection between the wireless acquisition 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 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 reply to confirm operation before finishing data acquisition, the processing is simpler, the efficiency is higher, and the time synchronization is more accurate.
The time of synchronous acquisition and the time 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 can reach within 10us seconds under an ideal working state, thereby realizing high-degree synchronous data acquisition.
In one embodiment of the present invention, the vibration data wireless synchronous acquisition method is shown in fig. 2, and different from the above embodiment, the method continues to scan for receiving the synchronous acquisition broadcast Message (denoted as Message2), and calibrates and stores the local time of the sensor and the local synchronous acquisitionAfter time, go to 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 … …, that is, the execution times of continuously scanning and receiving the synchronous acquisition broadcast messages broadcasted 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 less than or equal to the broadcast round period.
In an embodiment of the present invention, different from the above-mentioned embodiments, the broadcast is not in the form of periodically sending the synchronous acquisition broadcast data as described above, but is a one-time synchronous acquisition instruction, where a time for performing a synchronous acquisition action is specified, and after the one-time synchronous acquisition instruction is issued, the wireless vibration sensor starts synchronous acquisition according to the specified time.
In an embodiment of the present invention, a vibration monitoring system is provided, as shown in fig. 1, where the monitoring system includes an online device monitoring and fault diagnosing apparatus (hereinafter referred to as a monitoring and diagnosing apparatus), and the vibration data wireless synchronous acquisition system, where the monitoring and diagnosing 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 includes a sensor control module, a data receiving module, and a data uploading module, which are modules related to synchronous acquisition, wherein the sensor control module is responsible for receiving a control command issued by the monitoring and diagnosing apparatus, and performing parameter setting and acquisition control on the sensor according to the command; the data receiving module receives data acquired by the wireless vibration sensor; and the data uploading module is responsible for packaging the data packets and uploading the data packets to the monitoring and diagnosing device.
The monitoring and diagnosing device comprises an acquisition control module, a data storage module and a data analysis module, and a synchronous acquisition related module, wherein the acquisition control module is used for carrying out parameter setting and acquisition control on a wireless acquisition gateway and a wireless vibration sensor, the data storage module is responsible for receiving vibration data uploaded by the wireless acquisition gateway and carrying out grouping storage, and the data analysis module is responsible for analyzing the vibration data by using tools such as signal processing and the like and judging whether mechanical equipment has faults or not.
In the application of fault diagnosis of mechanical equipment, the acquisition of sensing data must have synchronism to ensure the accuracy of a diagnosis result, and in the application scene, the wireless vibration sensor is controlled to synchronously acquire only according to the test frequency, for example, the wireless vibration sensor is set to acquire every 4 hours, and the wireless vibration sensor does not need to acquire in real time in the operation process of the mechanical equipment. By adopting the scheme of the invention, the upper layer system can be flexibly utilized to set synchronous acquisition time and issue synchronous acquisition instructions, for example, the synchronous acquisition time is set to be a plurality of time points with intervals of 4 hours in the form of configuration files, then the next time point can be automatically changed to be the synchronous acquisition time after the timing reaches the first time point, and in the 4 hours, the awakening working time of the actual sensor is short in a combined mode of calibration and dormancy, so that the energy is greatly saved, more importantly, a sampling timer is started within the time range of a broadcast interval for timing no matter the time difference between the set synchronous acquisition time and the current time, and the synchronous acquisition time errors of a plurality of sensors after time calibration are within a plurality of microseconds.
The interface 1 of the wireless vibration sensor and the wireless acquisition gateway can be in a zigbee or bluetooth wireless mode, and the interface 2 of the wireless acquisition gateway and the monitoring and diagnosing device can be in an Ethernet, WiFi or 3G/4G/5G mobile network.
The invention does not need to increase a GPS chip or other hardware, utilizes wireless broadcast to carry out synchronous acquisition, for wireless transmission, the speed of electromagnetic wave is close to the light speed, the time of information transmission can be ignored, and the mode of sampling wireless broadcast sends the synchronous acquisition message, so that the air time of receiving the message by all wireless vibration sensors is completely the same, the difference is that the processing time of the message in different wireless vibration sensors can be different, for the wireless vibration sensors of the same type, as long as the running clock frequency is the same, the processing logic and the instruction after receiving the message are the same, therefore, the time of receiving the wireless synchronous acquisition message by different wireless vibration sensors can be considered to be the same, and the synchronous acquisition message of the wireless broadcast is more accurate than the time synchronization of the connected two-way message; even for different types of wireless vibration sensors, the local time and the required synchronous acquisition time can be corrected by the timestamp information transmitted in the broadcast data, and the time error between the sensor and the wireless acquisition gateway due to different clocks can be better eliminated or reduced.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. A vibration data wireless synchronous acquisition method is characterized in that synchronous data acquisition of a plurality of wireless vibration sensors is carried out through the following steps under the condition that a GPS chip is not needed:
periodically broadcasting and sending synchronous acquisition broadcast messages to a plurality of wireless vibration sensors at preset broadcasting turns, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a timestamp of a current message, and the synchronous acquisition time is later than the timestamp;
the awakened wireless vibration sensor scans and receives the synchronous acquisition broadcast message;
each wireless vibration sensor stores the synchronous acquisition broadcast message received for the first time after the wireless vibration sensor is awakened, and the local time of each sensor is calibrated or the local synchronous acquisition time is updated by using the timestamp in the synchronous acquisition broadcast message;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is greater than the broadcasting cycle period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcasting messages, simultaneously utilize the new synchronous acquisition broadcasting messages to calibrate the local time and the local synchronous acquisition time of the sensor, and store the updated local time and the updated local synchronous acquisition time;
and if the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcasting cycle period, stopping receiving the broadcasting message by each wireless vibration sensor, starting a timer for timing until the current latest local synchronous acquisition time is reached, and starting data acquisition by the corresponding wireless vibration sensor.
2. The utility model provides a vibration data wireless synchronization collection system, includes wireless collection gateway and a plurality of wireless vibration sensor, wherein, wireless collection gateway is configured with and is used for receiving the data that wireless vibration sensor gathered, its characterized in that, under the condition that need not the GPS chip, carries out the synchronous data acquisition of a plurality of wireless vibration sensor through following steps:
the wireless acquisition gateway receives a synchronous acquisition instruction issued by an upper system, wherein the synchronous acquisition instruction comprises synchronous acquisition time and identification numbers of a plurality of wireless vibration sensors needing to be synchronously acquired;
the wireless acquisition gateway responds to the synchronous acquisition instruction, periodically broadcasts and sends synchronous acquisition broadcast messages at intervals of a preset broadcast turn, wherein the synchronous acquisition broadcast messages comprise synchronous acquisition time and a timestamp of a current message, and the synchronous acquisition time is later than the timestamp;
the wireless acquisition gateway wakes up the corresponding wireless vibration sensors according to the identification number information in the synchronous acquisition instruction, and the awakened wireless vibration sensors scan and receive synchronous acquisition broadcast messages broadcasted by the wireless acquisition gateway;
each wireless vibration sensor stores the synchronous acquisition broadcast message received for the first time after the wireless vibration sensor is awakened, and the local time of each sensor is calibrated or the local synchronous acquisition time is updated by using the timestamp in the synchronous acquisition broadcast message;
each wireless vibration sensor compares the current local time with the current synchronous acquisition time, if the time interval is greater than the broadcasting cycle period, the wireless vibration sensors continue to scan and receive the synchronous acquisition broadcasting messages broadcasted by the wireless acquisition gateway, simultaneously utilize the new synchronous acquisition broadcasting messages to calibrate the local time and the local synchronous acquisition time of the sensor, and store the updated local time and the updated local synchronous acquisition time;
and if the time interval between the current local time and the current synchronous acquisition time is less than or equal to the broadcasting cycle period, stopping receiving the broadcasting message by each wireless vibration sensor, starting a timer for timing until the current latest local synchronous acquisition time is reached, and starting data acquisition by the corresponding wireless vibration sensor.
3. The system of 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 turn period and less than the sleep duration period, the method repeats: and continuously scanning and receiving the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway, calibrating the local time and the local synchronous acquisition time of the sensor by using the new synchronous acquisition broadcast message, and storing the updated local time and the updated local synchronous acquisition time.
4. The 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 the sleep duration period, the wireless vibration sensor enters the sleep mode, wakes up again after the sleep duration period, and scans and receives the synchronous acquisition broadcast message broadcast by the wireless acquisition gateway.
5. The system for wireless and synchronous acquisition of vibration data according to claim 2, wherein the wireless vibration sensor continues to scan and receive the synchronous acquisition broadcast message broadcasted by the wireless acquisition gateway 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 period of the broadcast turn.
6. The vibration data wireless synchronous acquisition system of claim 2, wherein said calibrating the respective sensor local time or updating the local synchronous acquisition time with the timestamp in the synchronous acquisition broadcast message further comprises:
the wireless vibration sensor compares the local time of the sensor with the timestamp, and if the local time is smaller than the timestamp or the difference value is larger than a preset time difference value threshold value, the local time of the sensor is calibrated, so that the calibrated local time of the sensor is the timestamp;
otherwise, updating the local synchronous acquisition time to t s ＝T s +t 1 -T 1 Wherein, t s For updated local synchronous acquisition time, T s For synchronous acquisition of synchronous acquisition times, t, in broadcast messages 1 For sensor local time, T 1 Time stamps in the broadcast messages are collected for synchronization.
7. The system for wireless synchronized acquisition of vibration data according to claim 2, wherein said calibrating the sensor local time and the local synchronized acquisition time with a new synchronized acquisition broadcast message further comprises:
the local synchronous acquisition time for calibrating the wireless vibration sensor is as follows: t' s ＝t 1 +(t s -t 1 )*(t 2 -t 1 )/(T 2 -T 1 ) Wherein, t' s For calibrated local synchronous acquisition time, t s For the local synchronous acquisition time before calibration, t 1 For the first time the synchronous acquisition broadcast message is received, the local time of the sensor, t 2 Local time of sensor, T, for receiving a new synchronous acquisition broadcast message 1 Time stamp, T, in the synchronous acquisition broadcast message for the first time 2 Collecting a timestamp in the broadcast message for the new synchronization;
the local time for calibrating the sensor by the wireless vibration sensor is as follows: t is t 2 ＝T 2 Wherein, t 2 For calibrated local time of the sensor, T 2 The timestamp in the broadcast message is collected for the new synchronization.
8. The system for wireless and synchronous acquisition of vibration data according to claim 2, wherein the wireless vibration sensor calibrates the local time of the sensor before calibrating the local synchronous acquisition time;
and 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 for the 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 to perform data acquisition until the acquisition sampling point number meets the synchronous acquisition sampling point number in the synchronous acquisition broadcast message; and/or the presence of a gas in the gas,
the synchronous acquisition broadcast message also comprises a broadcast serial number of the current message, the data packet of the point-to-point connection between the wireless acquisition gateway and the wireless vibration sensor comprises a connection serial number, and the broadcast serial number and the connection serial 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, which is characterized by comprising a monitoring and diagnosing device and the vibration data wireless synchronous acquisition system as claimed in any one of claims 2 to 9, wherein the monitoring and diagnosing 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 which is 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 which is configured to analyze the vibration data uploaded by the wireless acquisition gateway to determine whether the mechanical equipment generating the vibration data has a fault.
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