Transcription of VIBRATION TESTING Good vibrations - Data Physics
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VIBRATION TESTING Good vibrations - Data Physics
30 AEROSPACE TESTING INTERNATIONALMAY 2003 VIBRATION TESTINGGood vibrationsibration TESTING of aircraft is notsomething one may wish toundertake in the air. As well asthe risk and discomfort, it is anexpensive practice. However there is analternative: ground VIBRATION TESTING (GVT). This means of TESTING identifiesmodes of VIBRATION of the aircraft structureby one of two techniques. One techniqueinvolves the aircraft being excited bymulti-input broadband VIBRATION whilethe frequency response functions (FRFs)are measured by the multi-input multi-output (MIMO) method, and multidegreeof freedom (MDOF) curve fitting is usedto identify the modal frequencies anddamping followed by the mode other technique uses multi-inputsinusoidal VIBRATION , forcing a singlemode of VIBRATION to be sustained at atime, with measurements from all loca-tions used directly to compute the modeshapes.
tested using the broadband MDOF modal analysis method. NMA was the only method of mode identification until the advent of the FFT, which gave rise to the evolution of the broadband test technique and the consequent development of MDOF curve fitting. The development of ... evolved method of Modal Analysis.
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