EFFECT OF MISSING PATH AND FORCE ON VIBRATION RESPONSE PREDICTION

Accurate prediction of the vibration responses is an essential requirement during the design and optimization stages of mechanical structures. For this reason, a vibration response prediction (VRP) methodology, based on a set of frequency response functions (FRF) and operational responses, is established. In this methodology, defining the sources and transmission paths of the structure accurately is critical. Since it is based on the FRFs of the system, unconsidered sources and/or missing path result in inaccurate predictions. The goal of this paper is to present the effect of a missing path on the prediction results. In accordance with this purpose, a three degree-of-freedom system will be investigated analytically and VRP methodology will be applied along with the calculated receptances and displacements of the system.

Anahtar Kelimeler:

vibration response, matrix inversion, cross-coupling, 3 DOF systems

PDF

___

Verheij, J. W., (1982), Multipath Sound Transfer from Resiliently Mounted Shipboard Machinery, TNO, Delft, Netherlands
Hillary, B., (1983), Indirect Measurement Of Vibration Excitation Forces, PhD Thesis, Imperial College London, Dynamics Section, London.
Desanghere, G., Identification of external forces based on frequency response measurements, Proc. 8th Int. Seminar on Modal Analysis, Leuven, Belgium, 1983.
Janssens, M. H. A., Verheij, J. W., and Thompson, D. J., (1999), The use of an equivalent forces method for the experimental quantification of structural sound transmission in ships, Journal of Sound and Vibration, 226(2), pp. 305-328
Ribeiro, A. M. R., Silva, J. M. M., and Maia, N. M. M., (2000), On the generalisation of the transmissibility concept, Mechanical Systems and Signal Processing, 14(1), pp. 29-35.
Maia, N. M. M., Silva, J. M. M., and Ribeiro, A. M. R., (2001), The transmissibility concept in multi-degree-of-freedom systems, Mechanical Systems and Signal Processing, 15(1), pp. 129-137.
Ribeiro, A. M. R., Fontul, M., Maia, N. M. M., and Silva, J. M. M., Further developments on the transmissibility concept for multiple degree of freedom systems, Proceedings of the XIth International Conference on Vibration Engineering, Timisoara, Romania, 2005.
Gajdatsy, P., Janssens, K., Desmet, W., and Van der Auweraer, H., (2010), Application of the transmissibility concept in transfer path analysis, Mechanical Systems and Signal Processing, 24(7), pp. 1963-1976.
Roesems, D., Analysis of structure borne noise transmission paths, Proc. 6th Int. Seminar on Modal Analysis, Leuven, Belgium , 1981.
Verheij, J. W., Experimental procedures for quantifying sound paths to the interior of road vehicles, Proc. 2nd Int. Conference on Vehicle Comfort, pp. 483-491, Bologna, Italy, 1992.
Efunda, Multiple degree - of - freedom, 2015.