EFFECT OF ACCELEROMETER MASS ON THIN PLATE VIBRATION
Keywords:
Accelerometer mass, finite element, natural frequency, mode shape, thin plate.Abstract
Generally accelerometer mass effect is ignored in experimental studies based on the assumption that the accelerometer mass is negligible compared to the mass of the test structure. However when lightweight structure is tested, this effect is significant. The purpose of this study is to investigate the effect of accelerometer mass on thin plate vibration. The natural frequency and its corresponding mode shape were the parameters of interest. The thin plate clamped free boundary condition was investigated by using experimental modal analysis and finite element analysis. The accelerometer mass was added and mounted at three different locations. Results show the accelerometer mass has significant effect on some of the modes of the structure while other modes remain unchanged. The accelerometer mounted at a point of peak deflection of the plate showed large changes of natural frequencies and its corresponding mode shapes. There are no significant changes of natural frequency and mode shapes for accelerometer attached at nodal line of the particular mode. It is concluded that, the effect of accelerometer mass depends on the location of the accelerometer, vibration mode and magnitude of accelerometer massReferences
Døssing, O. 1991, Prediction of Transcducer Mass Loading Effects and Identification of Dynamic Mass. Proceeding of the 9th IMAC, Schenectady NY, Union College. 306-311
Baldanzinni N and Pierini. M. 2002; An Assesment of Transducer Mass Loading Effects on the Parameters of an Experimental Statistical Energy Analysis (SEA) Model. Mechanical System and Signal Processing, Firenze, 16(5): 885-903
Døssing, O. Structural Testing Part 1 : Mechanical Mobility Measurement. Bruel and Kjaer.
Ashory. M. R, 2002, Assessment of the mass loading effects of
accelerometers in modal testing, Proceeding of the 20th International Modal Analysis Conference: 1027-1031.
Blevins. D. R., 1979 Formula for Natural Frequency and Mode Shape, Van NastraudReinhold Company, New York.
Mark, S and Torben. R.L Piezoeleric, 1987, Accelerometer and Vibration Preamplifier Theory and Application Handbook, Bruel and Kjaer, Denmark
Cakar. 0 and Sanliturk, K.Y. 2005; Elimination of Transducer Mass Loading Effects from Frequency Response Functions. Mechanical System and Signal Processing, 19 : 87-104.
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