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Multi-channel Synchronous Data Acquisition and Data Processing System for Modal Analysis

Author: LiZhen
Tutor: TangBaoPing
School: Chongqing University
Course: Mechanical and Electronic Engineering
Keywords: Engineering Standardized interfaces Synchronous data acquisition Data processing Modal Analysis
CLC: TH122
Type: Master's thesis
Year: 2008
Downloads: 115
Quote: 2
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Abstract


In order to meet the demand for experimental modal analysis of the mechanical structure design , mechanical fault diagnosis , while improving the operability and efficiency in the use of the modal analysis system , the paper starting from the point of view of the practical application of engineering on the front-end data acquisition , intermediate data processing and subsequent modal analysis aspects of the study , developed a set of engineering , low-cost, interactive good experimental modal analysis system for modal analysis of the mechanical structure . The general scheme of the system design , configuration and software target needs to determine the system 's hardware platform . The whole system is divided into four modules were designed - including project data management module , synchronous data acquisition module , data processing module , and modal analysis module . Put forward the concept of engineering data management system to design the system 's file system and directory system . The use of standardized development method proposed to design acquisition and control interfaces , file reading interface and data display interface . Finally, the above design approach to achieve the project data management module . The adaptive selection mechanism and the sampling frequency of the acquisition and control of the oscilloscope and record task separation method to solve the problem of low - frequency oscilloscope lag and high-frequency sampling data off point , cross track . Using the data recording cycle storage technology to solve the problem of a lack of long-term monitoring of hard disk space . In the above basis , designed to achieve a synchronous data acquisition module acquisition program configuration functions and data playback and analysis capabilities . Analysis of selected technology roadmap for modal analysis , data processing module and modal analysis module . Based on software engineering approach to design a way to import data in the data processing module , program data flow and control flow program , to build a data processing module of the software architecture . Structural modeling to calculate the frequency response function , parameter identification and vibration animation functions and integrated in the modal analysis module . Design of the mechanical structure of the modal analysis of a set of synchronous acquisition , processing and analysis in one system , the system of a motorcycle frame and rectangle modal testing, modal parameters of the structure and modes of information , and commercial modal analysis software were compared to verify the correctness of the developed system .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical design, calculation and mapping > Mechanical Design
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