CN202002913U - Wireless transmission acoustic emission monitoring system - Google Patents

Abstract

The utility model relates to an acoustic emission monitoring system for collecting and transmitting acoustic emission data based on a wireless communication network, which includes a monitoring host and several monitoring and collecting terminals. The monitoring host and the collecting terminals are connected by wireless communication to form a master-slave structure Monitoring network system, the monitoring host includes industrial control computer, and the radio module and monitoring software set in the industrial control computer, the monitoring host is the master station of the wireless data transmission system network, the acquisition terminal includes the acquisition module, and the radio module is set on the acquisition module , the acquisition module is connected with the probe, the acquisition module is powered by a battery pack and a solar panel, and the acquisition terminal is a slave station of the wireless data transmission system network. The utility model has the advantages of high receiving sensitivity, low transmitting power, fast transceiving conversion, high-speed and reliable data transmission, and the like.

Description

Wireless Transmission Acoustic Emission Monitoring System

technical field

The utility model belongs to the technical field of rock mass acoustic emission monitoring, in particular to an acoustic emission monitoring system for collecting and transmitting acoustic emission data based on a wireless communication network.

Background technique

With the development of the national economy, large-scale mines, high and steep open-air slopes, large-scale railway tunnels, high-rise buildings, viaducts, and large-scale hydropower dams have been built and put into use one after another. Significantly increased, due to the lack of advanced security monitoring means and methods, the harm is serious. Acoustic emission detection technology can be used for safety detection evaluation and risk prediction of rock, concrete and other structures. Safety monitoring and hazard prediction using acoustic emission detection technology has the characteristics of a large amount of hazard prediction in advance, which provides valuable time for taking preventive measures. The use of acoustic emission detection technology for disaster prediction requires a large amount of distributed on-site data. These data are transmitted to the host for processing through some communication method, such as industrial field bus or local area network.

At present, for the transmission of collected data, most of them use wired methods, such as RS485, CAN bus, etc. These wired networks are generally used in factories, laboratories and other places where the location is relatively concentrated and fixed, and the network layout is more convenient. But for field data collection, the wired communication method shows obvious shortcomings. First of all, the distribution of collection points is relatively scattered and not fixed. In addition, the terrain and geological conditions are complex and diverse. The network layout and maintenance of wired transmission will consume a lot of manpower, material resources and financial resources. Therefore, the wireless transmission method has very unique advantages.

Currently, there are two common types of wireless communication methods:

1. Self-built radio communication network, such as traditional microwave communication, wireless data transmission radio communication, etc.;

2. Public wireless communication networks, paid services provided by third-party operators, such as GSM, GPRS, CDMA, SMS, etc.

In terms of real-time data collection and communication, there are still many problems in the functions provided by the public network. In addition to the need to continuously pay usage fees according to regulations, the bigger problem is that the real-time and reliability cannot meet the requirements. When busy, it may also cause the collapse of system communication.

However, traditional digital radio stations have been widely used in monitoring and various command and dispatch in the fields of electric power and water supply, and generally use the frequency band below 400M, which has many disadvantages such as low communication rate, crowded channels, and the need to apply.

Since the 1990s, with the rapid development of technologies such as embedded systems, wireless communications, networks, and MEMS, sensors with sensing, computing, and wireless network communication capabilities, as well as wireless sensor networks (WSNs) composed of them, have attracted worldwide attention. Of great concern to military departments, industry and academia in many countries.

Contents of the invention

The purpose of this utility model is to provide an acoustic emission monitoring system based on a wireless communication network for acoustic emission data acquisition and transmission to solve the problem of acoustic emission monitoring in complex environments in view of the deficiencies in the field data collection and transmission in the current acoustic emission detection technology.

The utility model purpose is realized by the following technical solutions:

The wireless transmission acoustic emission monitoring system includes a monitoring host and several monitoring and acquisition terminals. The monitoring host and the acquisition terminals are connected by wireless communication to form a monitoring system network with a master-slave structure. The hardware of the entire monitoring system is all industrial-grade components and parts.

The monitoring host includes an industrial control computer, a radio module and monitoring software set in the industrial control computer, and the monitoring host is the master station of the wireless data transmission system network.

The acquisition terminal includes an acquisition module, on which a radio module is set, the acquisition module is connected to the probe, the acquisition module is powered by a battery pack and a solar panel, the acquisition module is made of an aluminum alloy metal shell, and the acquisition terminal is a slave station of the wireless data transmission system network.

The coordination of each part of the system is based on mutual communication. Therefore, the selection and application of communication methods determine whether the operation of the entire system is reliable and efficient. According to the needs of practical application, what this system adopts is based on the way of wireless communication.

The radio signals in this system run on the free frequency band commonly used in the world (ISM 430M frequency band). There is a mutual relationship between the radio modules in this system to form a wireless communication network. The wireless communication network of this system adopts the point-to-multipoint form with transfer (forwarding), which is to choose a suitable place to install and set up transfer (forwarding) stations and equipment to play the role of relaying radio signals.

The beneficial effects of the utility model are:

1. The wireless communication protocol of this system supports an optional one-time forwarding function, that is, each collection point takes into account both data collection and differential (forwarding) communication functions. Not only can the transmission distance be effectively increased to make up for the lack of low-power radio communication distance, but also it is not necessary to use expensive high-power radio stations, which reduces the complexity of the system. Through the selection of the best communication route, avoid obstacles in the straight-line transmission to achieve the best communication effect. It has the characteristics of high receiving sensitivity, low transmitting power, fast switching between sending and receiving, and high-speed and reliable data transmission.

2. The entire system hardware adopts industrial-grade components and parts, which can meet the long-term normal operation of the system in the harsh environment of the wild without people.

3. The design of low power consumption is adopted to ensure the long-term operation of the system under the condition of battery power supply.

4. The system has a high processing rate and a large amount of data transmission. It adopts a license-free, suitable and low-cost wireless communication transmission method to ensure the normal operation of the data acquisition system.

5. The acquisition module adopts a small-sized aluminum alloy metal shell, which provides reliable protection and meets the requirements of flexibility.

Description of drawings

Figure 1 is a schematic diagram of the wireless transmission acoustic emission monitoring system

Fig. 2 is a schematic diagram of a point-to-multipoint wireless communication network with forwarding.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

The wireless transmission acoustic emission monitoring system includes a monitoring host, a monitoring collection terminal, and a wireless communication network. The three form a monitoring system network with a master-slave structure.

The monitoring host includes an industrial control computer, a radio module and monitoring software set in the industrial control computer, and the monitoring host is the master station of the wireless data transmission system network.

The monitoring software completes the communication management of the entire monitoring system, the monitoring database management and the real-time display of monitoring data. in

Communication Management:

* Indication and setting of communication status, working status and transmission route of acquisition unit.

* Acquisition unit synchronization and working mode settings.

* Acquisition unit internal temperature and working voltage indication.

Database management:

*Based on the database management of MS SQL Server, it can provide shared database data for other computers by connecting to the local area network.

* Flexible historical data query.

Real-time display of monitoring data:

* Real-time display of data collected by the system in graphs and bar graphs

*Settable value range and alarm limit

The monitoring acquisition terminal includes an acquisition module, on which a radio module is set, the acquisition module is connected to the probe, the acquisition module is powered by a battery pack, the acquisition module is made of an aluminum alloy metal shell, and the acquisition terminal is a slave station of the wireless data transmission system network.

The acquisition terminal is responsible for the acquisition, conditioning, storage and transmission of acoustic emission signal data. Each acquisition unit has a unique identification address that can be set, and has the functions of data acquisition, transmission and forwarding at the same time. The maximum number of acquisition units supported by this system is 64. Its characteristics:

*Industrial-grade high-speed 51-core microprocessor with a speed of up to 25MIPS is used as the processing core of the acquisition unit

*The large-capacity memory (SRAM) with a storage depth of 3500min can keep the host offline for a long time (2 days) without losing data.

*Reliable watchdog timer can effectively prevent accidental crashes from happening.

* Optically isolated communication ports.

*Independent power management ensures maximum battery life.

*Internal temperature detection alarm and battery voltage detection alarm. .

*Waterproof, anti-electromagnetic interference aluminum alloy shell.

The radio modules of this system form a wireless communication network, and this wireless communication network adopts a point-to-multipoint form with differential transfer (forwarding).

This system adopts the technology of protocol forwarding, and uses the way of software to transfer the transmission content in the way of relay. As shown in Figure 2, in any path from station Sn to master station M, as long as there is a station Sz with which both Sn and M can establish reliable communication, then even if Sn and M cannot directly establish reliable communication with each other, However, through the forwarding of the Sz site, a reliable communication channel can also be established between the master site M and the slave site Sn. The advantage of this form of networking is that on the one hand, it avoids the addition of special transfer (forwarding) sites and equipment; It can also be used as a forwarding site. This greatly improves the utilization rate of each slave station, simplifies the network structure of the system and reduces the cost of the entire system.

Claims (4)

1. The wireless transmission acoustic emission monitoring system includes a monitoring host and several monitoring and collection terminals. It is characterized in that the monitoring host and the collection terminals are connected by wireless communication to form a monitoring network system with a master-slave structure. 2. The wireless transmission acoustic emission monitoring system as claimed in claim 1, wherein the monitoring host computer includes an industrial control computer, and a radio module and monitoring software arranged in the industrial control computer, and the monitoring host computer is the main computer of the wireless data transmission system network. stand. 3. The wireless transmission acoustic emission monitoring system as claimed in claim 1, characterized in that the collection terminal includes a collection module, a radio module is set on the collection module, the collection module is connected with the probe, the collection module adopts a storage battery pack and a solar panel to supply power, and the collection module The module adopts an aluminum alloy metal shell, and the acquisition terminal is a slave station of the wireless data transmission system network. 4. The wireless transmission acoustic emission monitoring system according to claims 1-3, characterized in that a wireless communication network is formed between the radio modules, and the wireless communication network adopts a point-to-multipoint form with differential transfer.

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