At present, the data acquisition equipment of the exclusive array of earthquake response arrays imported from abroad has not been able to meet the domestic needs. Through multi-party selection, it was decided to use NI's cRIO to build a hardware platform, and use LabVIEW 8.6 to independently develop multi-channel strong vibration monitoring and alarm system.
NI cRIO is an advanced embedded control and acquisition system with long-lasting features and low power consumption. With NI cRIO, we have developed acquisition systems with low cost, short cycle and high reliability. The data triggering storage function in the system is more powerful and professional, supporting the seismic industry standard file format, and fully meeting the professional requirements of seismic signal processing and analysis. The real-time packaging of the data exchange format miniSEED, which is implemented in the seismic industry on the NI platform, and the transmission of data based on the communication protocol of the NetSeisIP seismic data stream are more innovative.
With the acceleration of China's economic construction, the impact of the earthquake on society and the economy has become more prominent. The construction of high-density digital strong earthquake network, array and series of supporting hardware and software has become an important measure to mitigate earthquake disasters. Pay attention to it. During the 10th Five-Year Plan period, the state built 1,160 fixed free-field strong vibration observation stations in 21 key earthquake monitoring and defense zones, and built active faults, ground motion attenuation, site topographic effects, large bridges and reservoirs throughout the country. 12 seismic response special arrays such as dams and typical building structures, but the data acquisition equipment in this area almost all rely on the whole set of imports, and bears the expensive cost burden and technical constraints, which restricts my national defense earthquake mitigation and social economy to a certain extent. development of.
TheChallenge:
The system has certain difficulty in high dynamic range, high timing accuracy, high spectral purity and multi-channel design. On FPGAs, GPS synchronization, digital downsampling, multiplexed control of calibration signals, and implementation of multiple complex triggering strategies are challenging; in the data interface, the miniSEED seismic data packet is encapsulated and based on the NetSeisIP seismic data stream. Communication is another difficult point. In data analysis, comprehensive analysis such as time domain index analysis, spectrum analysis and joint time spectrum analysis is required to process and perform strong vibration alarms.
TheSolution:
Using NI's cRIO module and LabVIEW 8.6 integrated development software to quickly build a software and hardware platform for multi-channel strong vibration monitoring and alarm system development, to achieve ground motion signal conditioning, data acquisition, clock synchronization, data compression transmission, real-time data analysis, Data offline analysis, health diagnosis, sudden vibration damage event alarm, network communication and instrument control.
“With NIcRIO, we have developed a seismic data acquisition system with low cost, short cycle and high reliability. The data trigger storage function in the system is more powerful and professional, supporting the seismic industry standard file format, fully meeting seismic signal processing and analysis. Professional requirements." The multi-channel strong vibration monitoring and alarm system based on NIcRIO "has been put into use in the special seismic array of the Humen Bridge in Guangdong, and it has achieved initial results."
1. Strong vibration monitoring and alarm system
“Multi-channel strong vibration monitoring and alarm system based on NIcRIO†is designed for long-term strong vibration monitoring and analysis of health conditions of major projects, lifeline projects, super high-rise buildings and special structures. It can be distributed and distributed. It can also work independently as a single monitoring system. The system consists of three parts: seismic observation station, dedicated line network and data center, as shown in Figure 1.
Figure 1 Strong vibration monitoring and alarm system
The data collector in the seismic observation site is built using the NIcRIO data acquisition module, GPS module and power module. The cRIO is composed of an embedded real-time controller cRIO9014, a cRIO backplane cRIO9104, an analog input module cRIO9205, an analog output module cRIO9263, and a high-speed digital IO module cRIO9401. as shown in picture 2.
Figure 2 Internal structure of multi-channel strong vibration data collector
2. Software architecture and implementation of strong vibration monitoring and alarm system
The system software architecture is implemented by the data acquisition terminal and the upper computer control analysis terminal.
2.1 Collection terminal system software architecture
The software of the entire data collection terminal consists of two parts: data acquisition and communication. Data acquisition is implemented on FPGAs and real-time controllers, integrating challenging features such as GPS synchronization, digital downsampling, multiplexed control of calibration signals, and a variety of complex triggering strategies. In the interface of the communication part, the real-time data stream is directly compressed into a miniSEED format by the data collector, and transmitted to a remote seismic flow server or a host computer monitoring and analysis software according to the communication protocol of the NetSeisIP seismic data stream, as shown in FIG. .
Figure 3 is a block diagram of the system software structure of the acquisition terminal
2.2 Implementation of host computer communication control and analysis software
The upper computer communication control and analysis software is mainly composed of four modules: recorder setting, real-time monitoring, data management and data analysis. The recorder settings include general, data acquisition, channel, event record information settings, etc. Real-time monitoring includes real-time display of waveforms, channel representation, local record settings, local recording, remote recording, calibration signals, site information, system status, connections Status, GPS capture status, second pulse lock status, strong earthquake alarm, real-time calculation and display of key parameters, etc.; data management includes data collection and data deletion of data collector, local data update and deletion. Data analysis can analyze the time domain index of the signal in real time or offline, and perform spectrum analysis and time spectrum analysis on the time domain waveform to calculate key parameter information such as health diagnosis and alarm.
in conclusion
With NI's powerful, efficient and easy-to-use graphical programming language LabVIEW, combined with the advanced cRIO hardware platform, we built a multi-channel strong vibration monitoring and alarm platform in a short period of time to achieve ground motion faster. Complex functions such as signal conditioning, data acquisition, clock synchronization, data compression and transmission, real-time data analysis, offline data analysis, health diagnosis, sudden vibration damage event alarm, network communication and instrument control greatly shorten the development cycle of the program. "NIcRIO-based multi-channel strong vibration monitoring and alarm system" achieves high dynamic range, high timing accuracy, high spectral purity and multi-channel design requirements, and combines industry applications with innovative methods at NI Data compression and transmission based on NetSeisIP protocol are implemented on the platform. It is foreseeable that in the seismic industry, the use of NI products for related research and development will have broad prospects for development.
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