CN104121981A - Remote wireless vibration monitoring device applied to offshore jacket ocean platform - Google Patents

Abstract

The invention discloses a remote wireless vibration monitoring device applied to an offshore jacket ocean platform. The remote wireless vibration monitoring device comprises a single chip, a single chip peripheral circuit, a system main control unit, a data transmission interface module, a data storage unit, an ADC conversion circuit, a signal conditioning circuit, a wireless reception unit, a wireless acquisition unit and acceleration sensors, wherein the wireless acquisition unit is connected with the plurality of acceleration sensors; the wireless acquisition unit is sequentially connected with the single chip after through the wireless reception unit, the signal conditioning circuit and the ADC conversion circuit sequentially; the single chip is connected with the single chip peripheral circuit, the system main control unit, the data transmission interface module and the data storage unit respectively. The remote wireless vibration monitoring device disclosed by the invention is low in power consumption, high in performance, modularized, high in data rate, low in bit error rate, high in robustness, and rapid to install.

Description

Remote Wireless Vibration Monitoring Device Applied to Shallow Sea Jacket Offshore Platform

technical field

The invention relates to a detection device, in particular to a remote wireless vibration monitoring device applied to an offshore platform of a shallow sea jacket.

Background technique

Vibration test method is a newly emerging engineering experiment method for safety assessment and remaining service life prediction of large-scale engineering structures in recent years. It has the advantages of low cost, simple and convenient test construction, and does not affect normal production. It can be widely used in various Real-time monitoring and non-destructive testing of the health of various engineering structures. The current popular vibration testing methods are mainly divided into the following three categories:

(1) Environmental incentive method

The environmental excitation method uses various external environmental forces as the vibration source of the structural vibration test. These external environmental forces mainly include: wind force, earthquake force, wave and tidal force, working load, such as the force on the bridge structure when vehicles and trains pass the bridge .

Under the action of the above various external environmental excitations, the output vibration response of the target structure is collected by a set of sensor systems. Under the premise of making certain general assumptions about the excitation source (such as steady state, white noise, one-way or known multi-directional vibration source, etc.), the mode identification of the experimental data can be carried out, so that the various parameters of the target structure can be Modal features are extracted from measured data. The main advantages of the environmental vibration excitation method are low cost, little impact on the normal operation of the structure, and suitable for long-term monitoring.

(2) Forced incentive method

The forced excitation method uses an artificial excitation source as the vibration excitation of the structural system, and in general, an exciter is used as the forced excitation source. Compared with the environmental incentive method, the forced incentive method has many advantages. Because the various parameters of the excitation source can be artificially and precisely set, the uncertainty in the process of data acquisition and processing is greatly reduced, thus giving researchers more freedom. In addition, by using a filter or increasing the amplitude of the artificial source, the specific response of the structure to a known source can be easily separated from the vibration response to other environmental loads and noise, thereby reducing the processing time of measured data. difficulty. Compared with the ambient vibration method, the forced vibration method needs to be equipped with artificial vibration equipment, thus increasing additional costs.

(3) Free vibration method

The principle of the free vibration method is to drag the elastic structure away from its static position and then release it suddenly, so that the system produces free attenuation motion. By analyzing the measurement data of free vibration, various properties of the structure can be obtained.

So far, the use of vibration testing methods for non-destructive testing of structures is mainly applied to bridges and other simple engineering structures, and can only obtain the approximate range of structural damage, while the realization of precise location of structural damage is currently limited to Conduct research on simple structures in a single environment in the laboratory.

In recent years, the research on vibration testing technology for structural failure monitoring of bridges and railways has been carried out in China and has been applied; turbid underwater imaging technology, underwater ultrasonic three-dimensional imaging technology, shallow section detection technology, underwater pit type Scanning detection technology has a certain foundation. Utilizing the existing technology, developing a portable and movable vibration detector is an important development direction of offshore platform safety assurance technology.

The traditional industrial vibration monitoring method is mainly the hand-held vibration inspection instrument, that is, the vibration parameters of each point are artificially monitored by the hand-held vibration inspection instrument. The disadvantage of this method is that it requires a lot of manpower. For the occasions where the on-site working environment is relatively harsh, the physical and mental health of the operators will be greatly affected. This method cannot automatically store data, nor can it realize real-time remote monitoring. ; And the operation is difficult, the labor intensity is high, and the production efficiency is very low, which cannot meet the needs of market development. In addition, the detectors in the industry are generally used in the fields of factory environment bearing detection, wind power motors, motor vehicles, etc., and there is no synchronization requirement for collection points. This system is specially used on offshore platforms and requires global vibration data.

The traditional vibration tester usually adopts a centralized control mode where the measuring point is separated from the host computer; the system expansion capability is weak, and the measurement accuracy of the measuring point, the frequency response range, the degree of intelligence, and the way of system data collection, recording, transmission, and processing Methods and other indicators can not meet the needs of accurate modal analysis.

Contents of the invention

The technical problem to be solved by the present invention is to provide a remote wireless vibration monitoring device applied to the shallow sea jacket offshore platform, which has low power consumption, high performance, modularization, high data rate, low bit error rate, and high robustness. And the installation is quick.

The present invention solves the above-mentioned technical problems through the following technical solutions: a remote wireless vibration monitoring device applied to shallow sea jacket offshore platforms, which is characterized in that it includes a single-chip microcomputer, a single-chip peripheral circuit, a system main control unit, a digital Transmission interface module, data storage unit, ADC conversion circuit, signal conditioning circuit, wireless receiving unit, wireless acquisition unit, acceleration sensor, the wireless acquisition unit is connected to multiple acceleration sensors, and the wireless acquisition unit passes through the wireless receiving unit, signal conditioning circuit, The ADC conversion circuit is connected with the single-chip microcomputer, and the single-chip microcomputer is respectively connected with the peripheral circuit of the single-chip computer, the system main control unit, the data transmission interface module, and the data storage unit.

Preferably, the single-chip microcomputer adopts STM32F208 single-chip microcomputer, and the single-chip microcomputer and the peripheral circuit of the single-chip microcomputer form a central processing circuit.

Preferably, both the wireless receiving unit and the wireless acquisition unit use a Zigbee wireless communication module or a Wi-Fi wireless communication module, supplemented by a high-speed USB data transmission interface.

Preferably, the acceleration sensor is an accelerometer Model 4803A produced by Silicon Designs, USA.

The positive progress effect of the present invention lies in: the present invention has low power consumption, high performance, modularization, high data rate, low bit error rate, high robustness, and quick installation.

Description of drawings

Fig. 1 is a structural schematic diagram of a remote wireless vibration monitoring device applied to a shallow sea jacket offshore platform according to the present invention.

FIG. 2 is a schematic circuit diagram of a data storage unit in the present invention.

Detailed ways

The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

As shown in Figure 1 and Figure 2, the remote wireless vibration monitoring device applied to the shallow sea jacket offshore platform of the present invention includes a single-chip microcomputer, a peripheral circuit of the single-chip microcomputer, a system main control unit, a data transmission interface module, a data storage unit, an ADC conversion circuit, Signal conditioning circuit, wireless receiving unit, wireless acquisition unit, acceleration sensor, the wireless acquisition unit is connected with multiple acceleration sensors, the wireless acquisition unit is connected to the single-chip microcomputer after passing through the wireless receiving unit, signal conditioning circuit, and ADC conversion circuit in turn, and the single-chip microcomputer is respectively connected to the single-chip microcomputer The peripheral circuit, the system main control unit, the data transmission interface module and the data storage unit are connected. The single-chip microcomputer adopts STM32F207VGT6 single-chip microcomputer, and the single-chip microcomputer and the peripheral circuit of the single-chip computer form the central processing circuit. Both the wireless receiving unit and the wireless acquisition unit use Zigbee wireless communication module or Wi-Fi wireless communication module, supplemented by high-speed USB data transmission interface. The single-chip microcomputer is responsible for detecting the overall working status of the system, coordinating the working mode of each component of the system, and recording work logs and other auxiliary work. The wireless acquisition unit can adopt an optimization algorithm according to different noise environments, and use a combination of software and hardware to filter the frequency band of the broadband input signal at the front end of the sensor to filter out interference noise and improve the signal-to-noise ratio; at the same time, traditionally rely on the system host to complete Most of the measurement and control functions such as signal conditioning, data acquisition, and data recording. On the one hand, this distributed acquisition and processing mode simplifies the complexity of the system host, improves system redundancy and reliability, and at the same time greatly enhances the overall processing capacity of the system, providing sufficient space for further expansion of system functions . The wireless acquisition unit includes a memory, an analog signal adjustment circuit, and a wireless data transmission unit. The memory uses an SD card for data storage; the analog signal adjustment circuit mainly includes an ADC, an integrated operational amplifier, and a filter circuit; -Fi wireless communication module, supplemented by high-speed USB data transmission interface.

The acceleration sensor is the accelerometer Model4803A produced by Silicon Designs of the United States. This is a capacitive micro-mechanical acceleration sensor, which has the advantages of low power consumption, high sensitivity, low noise, broadband, and good cost performance, and can basically meet the requirements of platform vibration detection. Its main performance indicators are shown in Table 1:

Table 1

Measuring range ±10g 3dB frequency response 0～300Hz sensitivity 2V/g output noise 13ug/√Hz Maximum shock resistance 2000g power consumption 30mW temperature drift ≤300ppm/℃

It can be seen from the above table that the frequency response range of this new type of sensor can be as low as DC in theory, which fully meets the measurement requirements for ultra-low frequency vibration mode shapes of large-scale shallow sea jacket platforms. The average noise value is about 100-200ug in the bandwidth range of 0-100Hz. Considering that the measuring range is about ±2g, the dynamic range of this sensor reaches 100dB, which can fully meet the requirements of measuring weak platform vibration signals. In addition, its low power consumption and strong impact resistance are also particularly suitable for field construction requirements.

The main performance indicators of the present invention are as follows: the acceleration sensor realizes quadrature 3-component output, the range is optional: ±2g～±10g, the frequency response range is from DC to 300Hz, the measurement accuracy is less than 0.1mg, the dynamic range is greater than 100dB, and the weight is 56g; Realize the centralized management of 16 collection points, the wireless transmission distance is greater than 100 meters, the wireless management distance is greater than 2000 meters, the data can be uploaded in real time, the minimum scale is 1ms, it can guarantee 48 hours of continuous 1kHz sampling and can be installed quickly, and the installation time of a single collection point is less than 1min ; The system can work in the temperature range of -40°C to 70°C, and is suitable for applications under wind conditions of not less than 10 degrees, and the life of the sensor is more than 5 years.

Compared with existing industrial products, the data reliability of this system is stronger. It adopts the combination of wired sensor and wireless launch box. The acceleration sensor adopts a close-fitting design, while most of the existing systems package the sensor in the launch box. Inside, the launch box is fixed, so that there is a lot of buffer between the acceleration sensor and the workpiece on site, the data reliability is poor, and it cannot reflect the real vibration situation; the data export is more convenient, and this system can achieve high-speed access without opening the box. Means of transmission, including the design of the launch box shell USB interface, Wi-Fi data transmission and SD card real-time storage, making data acquisition more convenient and reliable; real-time observation is more convenient, there are two ways to achieve it, including Wi-Fi wireless real-time data upload and Zigbee Issue wireless commands. The present invention is suitable for the harsh working environment at sea, and includes a sensor signal conditioning module, an analog-to-digital conversion circuit, a data recording module, a data transmission interface module, an embedded microprocessor module, and an intelligent offshore platform vibration test unit. The output vibration information is filtered and amplified by the signal conditioning module, and digitally collected by the analog-to-digital conversion circuit. These information, together with auxiliary information such as sampling time and sampling interval, are packaged and processed for data and stored in the extended memory. The entire platform structure vibration detector system adopts the topology of a distributed sensor network, consisting of multiple telemetry node units and a system master. Control unit to complete the long-term synchronous measurement of multi-point vibration shapes of the platform.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit In the present invention, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. the long-distance wireless vibration monitoring device being applied in the offshore jacket platforms of shallow sea, it is characterized in that, it comprises single-chip microcomputer, SCM peripheral circuit, system master unit, number passes interface module, data storage cell, ADC change-over circuit, signal conditioning circuit, radio receiving unit, wireless collection unit, acceleration transducer, wireless collection unit is connected with multiple acceleration transducers, wireless collection unit passes through radio receiving unit successively, signal conditioning circuit, after ADC change-over circuit, be connected with single-chip microcomputer, single-chip microcomputer respectively with SCM peripheral circuit, system master unit, number passes interface module, data storage cell is connected.

2. the long-distance wireless vibration monitoring device being applied in the offshore jacket platforms of shallow sea as claimed in claim 1, is characterized in that, described single-chip microcomputer adopts STM32F208 single-chip microcomputer, single-chip microcomputer and SCM peripheral the electric circuit constitute central processing circuit.

3. the long-distance wireless vibration monitoring device being applied in the offshore jacket platforms of shallow sea as claimed in claim 1, it is characterized in that, described radio receiving unit, wireless collection unit all use Zigbee wireless communication module or Wi-Fi wireless communication module, and are aided with high speed USB number biography interface.

4. the long-distance wireless vibration monitoring device being applied in the offshore jacket platforms of shallow sea as claimed in claim 1, is characterized in that, described acceleration transducer is selected the accelerometer Model 4803A being produced by Silicon Designs company of the U.S..