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Research on Data Acquisition Monitoring System for Rotating Mechinary Based on Embedded System

Author: ZhangWenLei
Tutor: YangShiXi
School: Zhejiang University
Course: Precision instruments and machinery
Keywords: Data acquisition Rotating Machinery ARM FPGA Anti-aliasing filtering
CLC: TP274.2
Type: Master's thesis
Year: 2008
Downloads: 246
Quote: 7
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Abstract


Rotating machinery is the key equipment of the electric power, petroleum, chemical and other departments, there will inevitably be some mechanical failure during operation, a small fault, are likely to cause a chain reaction, causing huge economic losses and even disastrous consequences. Implementation of the a rotating mechanical state of the real-time monitoring and diagnosis can reduce the accident rate of downtime, reduce maintenance costs, reduce production costs, to avoid the accident, an effective means of ensuring safe production. Therefore, for the study of large rotating machinery condition monitoring and fault diagnosis has important significance. This paper combines the State 863 Project \The system has a fully functional, reliable, low-cost, easy expansion; Field Programmable Gate Array FPGA (Field Programmable Gate Array) is introduced into the rotating machinery condition monitoring and fault diagnosis system, data acquisition and control, data cache and FFT analysis of functional modules; completion of the transplant work μC/OS- Ⅱ operating system on the ARM processor, software function module design based on the operating system; communication protocols within the system and outside the system, according to the characteristics of the system, select SPI and Industrial Ethernet communication protocol. The full text reads as follows: the first chapter, the significance of the study embedded rotating machinery condition monitoring data acquisition system; typical home and abroad the advantages and disadvantages of condition monitoring systems; combined with the characteristics of embedded systems, studied in the condition monitoring system, particularly The data acquisition system. Finally, the subject content of this thesis, the overall structure of the thesis. The second chapter describes the typical faults of rotating machinery and their corresponding signal characteristics, the analysis of the data acquisition system objects to be collected signal and its frequency domain. Introduce common state measurement parameters, the theory of signal measurement requirements for data acquisition, the experiment illustrates the amplitude spectrum analysis of the role in the diagnosis of rotating machinery. Technical indicators and functional requirements of the system, based on the overall structure of the data acquisition system for embedded systems. Chapter, the use of large rotating machinery eddy current sensor to monitor the vibration characteristics, the design of the vibration signal conditioning circuit. On three collection frequency domain filtering quality filter in the system Matlab simulation and comparison based switched capacitor filter anti-aliasing filtering methods; designed the Max 125 Collection chip-based acquisition circuit; two important chip ARM and FPGA selection, and their characteristics were analyzed in the application of the system. The fourth chapter the various functional modules in the FPGA design. Using FPGA to build a PLL (Phase Locked Loop) to achieve synchronous sampling control. Asynchronous clock to solve the data transmission method in FPGA design asynchronous FIFO, and timing simulation. FFT signal processing technology is introduced and analyzed, designed and implemented the FFT analysis module, workflow and interface details CoreFFT core meaning, and the United Matlab and ModelSim its into the functional verification. Chapter V design software functional modules. Completed μC/OS- Ⅱ operating system transplant LPC 2378 chip design specific software features modules on this operating system. Analysis of the system and the system with the host computer communication protocols, in conjunction with the system requirements and hardware resources selected for the system of communication. Chapter VI concludes the paper, and the future prospect.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Data collection and processing systems
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