WO2020007374A1

WO2020007374A1 - Distributed continuous vibration monitoring system

Info

Publication number: WO2020007374A1
Application number: PCT/CN2019/097389
Authority: WO
Inventors: 胡卫华; 滕军; 卞晓晗
Original assignee: 哈尔滨工业大学（深圳）
Priority date: 2018-07-06
Filing date: 2019-07-24
Publication date: 2020-01-09
Also published as: CN108847921B; CN108847921A

Abstract

A distributed continuous vibration monitoring system, comprising a plurality of sub-systems respectively disposed at various measurement points of an ultra-high-rise building. Each of the sub-system comprise: a terminal, comprising a memory and a processor, and configured to issue a control instruction according to a preset sampling frequency and a preset sampling duration; an acquisition unit, disposed at one of the measurement points of the ultra-high-rise building, and configured to acquire vibration data at the corresponding measurement point according to the control instruction and output the vibration data to the terminal; and a receiving end, configured to receive a satellite pulse per second signal to obtain satellite standard time. The memory stores a computer program, and the processor executes the computer program to eliminate a system time error in the vibration data received by the terminal. The distributed continuous vibration monitoring system provided by the present application has a distributed structure which is easy to implement and excellent data acquisition synchronization, thereby meeting the continuous vibration monitoring of ultra-high-rise buildings.

Description

Distributed vibration continuous monitoring system

Cross-reference to related applications

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on July 6, 2018, with application number 201810736985.2 and entitled "Distributed Continuous Vibration Monitoring System", the entire contents of which are incorporated herein by reference.

Technical field

The present application belongs to the technical field of vibration monitoring, and in particular, it is a distributed vibration continuous monitoring system.

Background technique

With the process of urbanization, China's construction industry has ushered in a rapid development opportunity. Buildings of various types have sprung up after the rain, meeting the needs of people's life, production and business interaction, and making urban civilization unprecedentedly prosperous. In order to ensure the structural safety of the building and provide design reference for the construction industry, a large number of long-term continuous monitoring of the building is required.

Among them, the vibration frequency of the building has an important influence on the structural performance of the building and is an important monitoring index. Vibration monitoring is the monitoring work for the vibration frequency. With the help of sensors installed at the measurement points of the building, the vibration data is collected. Among them, the synchronization of data acquisition of each sensor is very high.

In order to meet the requirements of synchronization, the vibration monitoring system mostly adopts a centralized system structure. As an urban landmark, the super-high-rise buildings have extremely high vertical spans and severely spaced vertical floors. The centralized system structure faces problems such as difficulty in wiring and exceeding the limit of wiring length, which is difficult to effectively implement in super high-rise buildings. If we adopt a distributed system architecture, we will face the problem of low synchronization. At present, the continuous vibration monitoring of super high-rise buildings has not been carried out sufficiently, which makes effective continuous vibration monitoring methods even more lacking.

Summary of the invention

In order to overcome the shortcomings of the prior art, the present application provides a distributed continuous vibration monitoring system with an easy-to-implement distributed structure and excellent data acquisition synchronization to meet the continuous vibration monitoring of super high-rise buildings.

The purpose of this application is achieved by the following technical solutions:

A distributed vibration continuous monitoring system includes a plurality of subsystems distributed at each measurement point of a super high-rise building. The subsystems include:

The terminal, including a memory and a processor, is configured to issue a control instruction according to a preset sampling frequency and a preset sampling duration;

A collection unit, which is divided into each measurement point of a super high-rise building, and is configured to collect vibration data of the corresponding measurement point according to the control instruction, and output the vibration data to the terminal;

A receiving end configured to receive a satellite second pulse signal to obtain a satellite standard time;

The memory stores a computer program, and the processor executes the computer program to eliminate a system time error in the vibration data received by the terminal according to the satellite second pulse signal.

As an improvement to the above technical solution, the acquisition unit includes an acquisition module and a sensor, and the acquisition module is configured to execute a compiled program to drive the sensor and transmit the vibration data of the corresponding measurement point to the terminal according to the control instruction. The sensor is configured to collect vibration data of the corresponding measurement point.

As a further improvement of the above technical solution, the system time error includes a clock error, a program time difference, and a packet loss time difference, the clock error is an error of the terminal's clock source relative to the satellite standard time, and the program time difference is The error between the running time of the compiler and the standard running time, and the packet loss time difference is a time error caused by a difference in the packet loss rate of the data transmission between the acquisition module and the terminal in each subsystem.

As a further improvement of the foregoing technical solution, the clock source is a local clock, and the second signal of the local clock is obtained by frequency division of a local crystal oscillator, a chirped clock, or a cesium clock.

As a further improvement to the above technical solution, the computer program includes the following steps:

Eliminating the clock error and the program time difference according to the satellite second pulse signal;

Eliminating the packet loss time difference according to the satellite second pulse signal.

As a further improvement of the above technical solution, the sensor is an acceleration sensor configured to collect an acceleration signal, and "eliminating the clock error and the program time difference based on the satellite second pulse signal" includes the following steps:

Acquiring the first satellite second pulse signal after the control instruction is issued;

Capture the starting point of the rising edge of the first satellite second pulse signal as the starting point of synchronization;

The acceleration signal after the synchronization starting point is intercepted as the vibration data of the corresponding measurement point.

As a further improvement of the foregoing technical solution, "eliminating the packet loss time difference according to the satellite second pulse signal" includes the following steps:

Determining the packet loss time difference according to the preset sampling frequency and the synchronous sampling duration;

Compensate correspondingly the vibration data received by the terminal according to the packet loss time difference.

As a further improvement of the foregoing technical solution, "determining the packet loss time difference according to the preset sampling frequency and the synchronous sampling duration" includes the following steps:

Calculating a theoretical synchronization end point according to the synchronization start point, the preset sampling frequency, and the synchronization sampling duration;

Index the actual synchronization end point according to the synchronization start point and the synchronization sampling duration;

Determining the packet loss time difference according to the theoretical synchronization end point, the actual synchronization end point, and the preset sampling frequency.

As a further improvement of the above technical solution, the actual synchronization end point is a rising edge start point of another satellite second pulse signal.

As a further improvement of the foregoing technical solution, the synchronous sampling duration is not greater than the preset sampling duration, and is a maximum value of an integer multiple of a period of the satellite second pulse signal.

The beneficial effects of this application are:

(1) A plurality of subsystems are provided at each measurement point of a super high-rise building, and multiple points are collected simultaneously in a distributed structure, which avoids the wiring difficulties of centralized construction and is easy to implement;

(2) The satellite second pulse signal is received by the receiving end, and the processor of the terminal executes the computer program stored in the memory, and the satellite time is used to eliminate the system time error in the vibration data received by the terminal, and realize the data between the various subsystems. Acquisition synchronization.

In order to make the above-mentioned objects, features, and advantages of this application more comprehensible, preferred embodiments are described below in conjunction with the accompanying drawings and described in detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so It should be regarded as a limitation on the scope. For those of ordinary skill in the art, other related drawings can be obtained according to these drawings without paying creative work.

FIG. 1 is a schematic structural diagram of a distributed continuous vibration monitoring system provided in Embodiment 1 of the present application; FIG.

2 is a schematic flowchart of a computer program of a distributed continuous vibration monitoring system according to Embodiment 2 of the present application;

3 is a schematic flowchart of step A of a computer program of a distributed vibration continuous monitoring system according to Embodiment 2 of the present application;

4 is a schematic flowchart of step B of a computer program of a distributed vibration continuous monitoring system according to Embodiment 2 of the present application;

5 is a schematic flowchart of step B1 of a computer program of a distributed vibration continuous monitoring system according to Embodiment 2 of the present application;

6a is a first schematic diagram of a computer program for positioning a synchronous starting point of a distributed vibration continuous monitoring system provided in Embodiment 2 of the present application;

6b is a second schematic diagram of a computer program for positioning a synchronous starting point of the distributed vibration continuous monitoring system provided in Embodiment 2 of the present application;

7a is a first-order mode shape of a super high-rise building actually monitored by the distributed vibration continuous monitoring system according to an embodiment of the present application;

7b is a second-order mode shape of a super high-rise building actually monitored by the distributed vibration continuous monitoring system according to an embodiment of the present application;

7c is a third-order mode shape of a super high-rise building actually monitored by a distributed vibration continuous monitoring system provided by an embodiment of the present application;

FIG. 7d is a fourth-order vibration mode of a super high-rise building actually monitored by the distributed vibration continuous monitoring system according to an embodiment of the present application; FIG.

FIG. 7e is a fifth-order mode shape of a super high-rise building actually monitored by the distributed vibration continuous monitoring system provided in the embodiment of the present application.

Explanation of main component symbols:

1000-distributed continuous vibration monitoring system, 0100-subsystem, 0110-terminal, 0111-memory, 0112-processor, 0113-input unit, 0114-display unit, 0120- acquisition unit, 0121- acquisition module, 0122-sensor , 0130-receiving end.

detailed description

In order to facilitate understanding of the present application, a distributed vibration continuous monitoring system will be described more fully below with reference to related drawings. The drawings show a preferred embodiment of a distributed continuous vibration monitoring system. However, the distributed vibration continuous monitoring system can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of a distributed vibration continuous monitoring system more thorough and comprehensive.

It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or intervening elements may be present concurrently. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the description of the distributed vibration continuous monitoring system herein are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to FIG. 1, this embodiment discloses a distributed vibration continuous monitoring system 1000. The monitoring system includes a plurality of sub-systems 0100 distributed at each measurement point of a super high-rise building. The subsystem 0100 includes a terminal 0110, a collection unit 0120, and a receiving end 0130. Each subsystem 0100 is independently set up, and there is no need to connect with each other through a cable, and vibration data collection is performed on the measurement points at which it is located.

The terminal 0110 includes a memory 0111 and a processor 0112, and is configured to issue a control instruction according to a preset sampling frequency and a preset sampling duration. It can be understood that the preset sampling frequency and the preset sampling time are preset by the user according to the structural characteristics of the super high-rise building to be monitored specifically. Exemplarily, within a preset sampling time period, the processor 0112 issues a pulsed control instruction at a preset sampling frequency to trigger a collection action by the collection unit 0120 to implement continuous monitoring of structural vibration of a super high-rise building.

The terminal 0110 includes terminal devices (such as computers and servers) that do not have mobile communication capabilities, and also includes mobile terminals (such as smart phones, tablet computers, on-board computers, and smart wearable devices).

The memory 0111 may include a program storage area and a data storage area. Among them, the storage program area can store operating systems and applications required for at least one function (such as sound playback function and image playback function, etc.); the storage data area can store data created according to the use of the terminal 0110 (such as audio data and Backup files, etc.). In addition, the memory 0111 may include a high-speed random access memory, and may further include a non-volatile memory (for example, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage device).

Exemplarily, the terminal 0110 further includes an input unit 0113 and a display unit 0114. The input unit 0113 is configured to receive various instructions or parameters (including a preset scrolling method, a preset time interval, and a preset scrolling number) input by a user, including a mouse, a keyboard, a touch panel, and other input devices. The display unit 0114 is configured to display various output information (including a webpage page and a parameter configuration interface, etc.) of the terminal 0110, including a display panel.

The collecting unit 0120 is divided into each measurement point of the super high-rise building, and is configured to collect vibration data of the corresponding measurement point according to the control instruction, and output the vibration data to the terminal 0110. It can be understood that the acquisition unit 0120 is an execution unit for vibration data collection, that is, to measure the vibration signal of the super high-rise building at the measurement point, convert the vibration signal into an electrical signal for transmission, and return it to the terminal 0110 for data analysis.

The collection unit 0120 can be implemented in many ways. For example, the collection unit 0120 includes a collection module 0121 and a sensor 0122.

The acquisition module 0121 is configured to execute a compiled program according to the control instruction to drive the sensor 0122 and transmit the vibration data of the corresponding measurement point to the terminal 0110. In other words, the terminal 0110 corresponds to the upper computer, and the acquisition module 0121 corresponds to the lower computer. The compiler is configured to translate the high-level language program into binary code, thereby driving the sensor 0122 to perform a collection action. Obviously, on the one hand, the acquisition module 0121 compiles the control instructions of the terminal 0110 into machine instructions to drive the sensor 0122, and on the other hand converts the vibration signals collected by the sensor 0122 into electrical signals for transmission and outputs.

Wherein, the sensor 0122 is configured to collect vibration data corresponding to a measurement point according to an instruction of the compiler. There are many types of sensors 0122, including acceleration sensors and strain gauges. Exemplarily, this embodiment uses an acceleration sensor for vibration measurement.

The receiving end 0130 is configured to receive the satellite second pulse signal to obtain the satellite standard time, and provide the time reference of the 0100 data synchronization of each subsystem through satellite timing. Among them, the satellite second pulse signal is issued by a satellite positioning system. The satellite positioning system may be a GPS and Beidou system with a timing function. The receiving end 0130 is a receiver that matches the satellite positioning system.

In this embodiment, the memory 0111 stores a computer program, and the processor 0112 executes the computer program to eliminate a system time error in the vibration data received by the terminal 0110 according to the satellite second pulse signal, thereby ensuring data between the subsystems 0100 Acquisition synchronization.

Exemplarily, the system time error includes a clock error, a program time difference, and a packet loss time difference. The clock error is an error of the clock source of the terminal 0110 relative to the satellite standard time, and the program time difference is the runtime of the compiled program relative to the standard operation. An error in time. The packet loss time difference is a time error caused by a difference in packet loss rate of data transmission between the acquisition module 0121 and the terminal 0110 in each subsystem 0100.

The clock source is a local clock, and the second signal of the local clock is obtained by dividing the local crystal oscillator, rubidium clock, or cesium clock. Relative to satellite standard time, the local clock has limited accuracy and has different delays, which results in different system delays between different subsystems 0100.

Among them, the program time difference is caused by the difference in hardware characteristics of the acquisition module 0121 of each subsystem 0100. In other words, the computing capabilities (such as performance differences) and computing environments (such as environmental temperature and humidity) of different acquisition modules 0121 are different, which results in significant differences in the running time of the compiler in different acquisition modules 0121, resulting in Delay affects synchronization.

Among them, due to problems such as memory and transmission rate, packet loss often occurs in the transmission of vibration data between the acquisition module 0121 and the terminal 0110. Due to system differences, the number of packet loss (corresponding to the packet loss rate) between 0100 of each subsystem is significantly different, resulting in a difference in the amount of vibration data received by terminal 0110 of each subsystem 0100, which is then reflected as a delay phenomenon, which makes Data collection cannot be synchronized, resulting in packet loss time differences.

Example 2

On the basis of Embodiment 1, this embodiment further discloses a computer program, which is stored in the memory 0111 of the terminal 0110 and configured to be executed by the processor 0112 to implement continuous monitoring. Synchronization between them to ensure monitoring accuracy.

Referring to FIG. 2, for example, the computer program includes the following steps:

A: Eliminate the clock error and the program time difference according to the satellite second pulse signal. It can be understood that both the clock error and the program time difference affect the vibration data collected by the sensor 0122. Therefore, by compensating the vibration data collected by the sensor 0122 according to the satellite second pulse signal, the clock error and the program time difference can be eliminated at the same time.

B: Eliminating the packet loss time difference according to the satellite second pulse signal.

Exemplarily, the sensor 0122 is an acceleration sensor configured to collect an acceleration signal, and the acceleration signal is a discrete pulse signal. Referring to Figure 3, Step A includes the following steps:

A1: the first satellite second pulse signal obtained after the control instruction is issued; it can be understood that based on the clock characteristics of each subsystem 0100, the satellite second pulses obtained by different receivers 0130 in the same period of the satellite second pulse signal The signal is the same satellite second pulse signal. In other words, after the control instruction is issued, the first satellite second pulse signal obtained by different receiving end 0130 is also the same satellite second pulse signal, thereby providing a calibrated clock reference for each subsystem 0100.

A2: capture the starting point of the rising edge of the first satellite second pulse signal as the starting point of synchronization;

A3: Intercept the acceleration signal after the synchronization starting point as the vibration data of the corresponding measurement point.

Please refer to Figs. 6a and 6b in combination. For example, a _i represents a signal point, and a subscript i represents a sequence number of the sampling point. When the amplitude difference between a _{i + 1} and a _i is greater than the threshold, it indicates that a _{i is the} starting point of the rising edge of the first satellite second pulse signal, that is, the starting point of the synchronization signal (that is, the starting point of synchronization). calibration. Obviously, the acceleration signals after point a _i are all synchronization signals, which meet the synchronization requirements.

Referring to FIG. 4, for example, step B includes the following steps:

B1: determining the packet loss time difference according to the preset sampling frequency and synchronous sampling duration;

B2: Compensate the vibration data received by the terminal 0110 correspondingly according to the packet loss time difference.

Exemplarily, the synchronous sampling duration is not greater than the preset sampling duration, and is a maximum value of an integer multiple of a period of the satellite second pulse signal. Since the synchronization sampling time is an integer multiple of the period of the satellite second pulse signal, theoretically, after the synchronization sampling time has passed from the starting point of the synchronization, the corresponding point is still the starting point of the rising edge of the satellite second pulse signal.

Referring to FIG. 5, for example, step B1 includes the following steps:

B11 (same as step A1): acquiring the first satellite second pulse signal after the control instruction is issued;

B12 (same as step A2): capture the starting point of the rising edge of the first satellite second pulse signal as the starting point of synchronization (for example, a _i );

B13: Calculate a theoretical synchronization end point based on the synchronization start point, the preset sampling frequency, and the synchronization sampling time; for example, if the synchronization sampling time is T ₁ and the preset sampling frequency is N, the theoretical synchronization end point is M _reason. = A _i + T ₁ · N.

B14: Index the actual synchronization end point according to the synchronization start point and the synchronization sampling duration; for example, the actual synchronization end point is the rising edge start point of another satellite second pulse signal. For example, the starting point M of the rising edge after indexing the synchronization sampling duration T ₁ in the vibration data spectrum received by the terminal 0110 _is the actual synchronization end point.

B15: Determine the packet loss time difference according to the theoretical synchronization end point, the actual synchronization end point, and the preset sampling frequency. For example, (M -M _solid _Li) / N loss is the difference. It should be understood that the packet loss time difference between different subsystems 0100 is not the same. Therefore, the vibration data of the corresponding subsystem 0100 needs to be compensated according to the packet loss time difference.

The computer program provided in this embodiment effectively solves the data synchronization problem of the distributed vibration continuous monitoring system 1000, avoids the system delay of the distributed structure, and is particularly suitable for large buildings such as super high-rise buildings.

Based on the collected data of the distributed vibration continuous monitoring system 1000, a mode analysis can be performed to obtain the various mode shapes of super high-rise buildings, which overcomes the technical obstacles of data synchronization and realizes the vibration monitoring of super high-rise buildings that could not be achieved in the past. . 7a to 7e respectively show the first to fifth-order mode shapes of super-tall buildings actually monitored, and show the effectiveness of the distributed continuous vibration monitoring system 1000.

In all the examples shown and described herein, any specific value should be construed as exemplary only and not as a limitation, so other examples of the exemplary embodiments may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, so once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

The above-mentioned embodiments only express several implementation manners of the present application, and the descriptions thereof are more specific and detailed, but cannot be understood as limiting the scope of the present application. It should be noted that, for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of this application shall be subject to the appended claims.

Claims

A distributed vibration continuous monitoring system is characterized in that it includes a plurality of subsystems that are distributed at each measurement point of a super high-rise building. The subsystems include:

The terminal, including a memory and a processor, is configured to issue a control instruction according to a preset sampling frequency and a preset sampling duration;

A collection unit, which is divided into each measurement point of a super high-rise building, and is configured to collect vibration data of the corresponding measurement point according to the control instruction, and output the vibration data to the terminal;

A receiving end configured to receive a satellite second pulse signal to obtain a satellite standard time;

The memory stores a computer program, and the processor executes the computer program to eliminate a system time error in the vibration data received by the terminal according to the satellite second pulse signal.
The distributed vibration continuous monitoring system according to claim 1, wherein the acquisition unit includes an acquisition module and a sensor, and the acquisition module is configured to execute a compiled program according to the control instruction to drive the sensor and provide the The terminal transmits vibration data of the corresponding measurement point, and the sensor is configured to collect vibration data of the corresponding measurement point.
The distributed vibration continuous monitoring system according to claim 2, wherein the system time error includes a clock error, a program time difference, and a packet loss time difference, and the clock error is a clock source of the terminal relative to the satellite Standard time error, the program time difference is the error of the runtime of the compiler relative to the standard time, and the packet loss time difference is the data transmission between the acquisition module and the terminal in each subsystem Time error caused by difference in packet loss rate.
The distributed vibration continuous monitoring system according to claim 3, wherein the clock source is a local clock, and the second signal of the local clock is obtained by dividing the local crystal, chirped clock, or cesium clock.
The distributed continuous vibration monitoring system according to claim 3, wherein the computer program comprises the following steps:

Eliminating the clock error and the program time difference according to the satellite second pulse signal;

Eliminating the packet loss time difference according to the satellite second pulse signal.
The distributed vibration continuous monitoring system according to claim 5, wherein the sensor is an acceleration sensor configured to collect an acceleration signal, and "the clock error and the program time difference are eliminated according to the satellite second pulse signal" It includes the following steps:

Acquiring the first satellite second pulse signal after the control instruction is issued;

Capture the starting point of the rising edge of the first satellite second pulse signal as the starting point of synchronization;

The acceleration signal after the synchronization starting point is intercepted as the vibration data of the corresponding measurement point.
The distributed vibration continuous monitoring system according to claim 5, wherein "eliminating the packet loss time difference based on the satellite second pulse signal" includes the following steps:

Determining the packet loss time difference according to the preset sampling frequency and the synchronous sampling duration;

Compensate correspondingly the vibration data received by the terminal according to the packet loss time difference.
The distributed continuous vibration monitoring system according to claim 7, wherein "determining the packet loss time difference according to the preset sampling frequency and the synchronous sampling time" includes the following steps:

Acquiring the first satellite second pulse signal after the control instruction is issued;

Capture the starting point of the rising edge of the first satellite second pulse signal as the starting point of synchronization;

Calculating a theoretical synchronization end point according to the synchronization start point, the preset sampling frequency, and the synchronization sampling duration;

Index the actual synchronization end point according to the synchronization start point and the synchronization sampling duration;

Determining the packet loss time difference according to the theoretical synchronization end point, the actual synchronization end point, and the preset sampling frequency.
The distributed continuous vibration monitoring system according to claim 8, wherein the actual synchronization end point is a rising edge start point of another satellite second pulse signal.
The distributed vibration continuous monitoring system according to claim 7, wherein the synchronous sampling duration is not greater than the preset sampling duration and is a maximum value of an integer multiple of a period of the satellite second pulse signal .