Stirling Engine Vibration Detection And Life Analysis

Energy and environmental problem is increasingly serious of today, because of working principle of the Stirling engine and its unique advantage has been widely applied. Therefore, in order to ensure that its application in practical production of safe and reliable operation, it has great application significance and economic value. These papers is based on Stirling engine as the research object, with its vibration mechanism, vibration signal characteristics and energetic changes in the running process as the start points, analysis of its working state for testing and life, then make reasonable programming to equipment, and ensure safety in production. The main contents are as follows.1、The widely used vibration signal detection methods and analysis application were studied at present. Describes the mechanism of vibration signal and undistorted sampling theorem, laid the theoretical foundation for the subsequent analysis. Then select the appropriate detection methods and signal processing method base on characteristics of a Stirling engine, And the defects of the existing analysis method is optimized, so that the accuracy of the subsequent signal is improved. Thus ensuring the final result of the subject reliable and effective.2、Study the main movement mechanism of vibration signal in the process of running of Stirling engine, among them, the typically major sports contains two aspects:reciprocating motion and. rotary motion; Then, using the knowledge of physics to the dynamics and kinematics analysis, determine vibration of the main causes, route of transmission and vulnerable components of the Stirling engine, and to determine the main test parameters, providing theoretical basis for follow-up analysis; And according to the selecting principle of observation posts and sensors, selection of appropriate sensors and installation position, the greatest degree of the signals collected need.3、On the EMD method of modal cracked and de-noising are studied, the results show that the fast ICA de-noising can be applied to this topic of signal de-noising and effectively decrease the mode fission phenomenon, it can obtain the good effect. Studies of AR model, the AR model are established and generate the AR spectrum, and the reliability of this model was validated by the experiment and realization the vibration detection of the measured object.4、Prediction of the life and comparative analysis of measured object with frequency domain energy distribution characteristics, It proposed a new method that based on the response signal characteristics of change of frequency band energy band method and combined method to predict the trend is the total energy, then used the appropriate standards for judging life prediction and apply it to the life prediction of Stirling engine, was evaluated the accuracy of the prediction results.5、Set up the hardware test platform. On the basis of theoretical knowledge, select the appropriate components to build vibration test platform. This topic useing the PCI1716high-speed data acquisition card on terms of signal acquisition and using MATLAB7.0and C++Builder6.0for joint programming software interface design and software programming.