关键词: 振动与波, 法兰连接, 振动测试, 谱分析, LabVIEW

Abstract: An analysis system, including the functions of signal generation, data acquisition, spectrum analysis etc, is developed using the virtual instrument LabVIEW software,for analyzing the vibration testing data of flange connection structures. With the use of the analysis system, analysis of the vibration testing data for the flange and bolt connection structure is completed for various prestressed bold forces. The spectrum analysis and difference analysis show that the dynamic response of the structure is significantly affected by the nonlinear behavior of the flangebolt connection structure. The nonlinear vibration effect and signal asymmetry can be obviously observed, and strongly depend upon the prestress state of the bolts. In virtue of the frequencyspectrum signals, the looseness of the bolts can be identified and some information can be provided for diagnosis of the connection structures.

Key words: vibration and wave, flangebolt connection, vibration measurement, spectrum analysis, LabVIEW