By Randy L. Mayes (auth.), R. Mayes, D. Rixen, D.T. Griffith, D. De Klerk, S. Chauhan, S.N. Voormeeren, M.S. Allen (eds.)
Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, quantity 2, court cases of the 30th IMAC, A convention and Exposition on Structural Dynamics, 2012, the moment quantity of six from the convention, brings jointly 31 contributions to this significant quarter of study and engineering. the gathering provides early findings and case stories on basic and utilized points of Structural Dynamics.
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Extra resources for Topics in Experimental Dynamics Substructuring and Wind Turbine Dynamics, Volume 2: Proceedings of the 30th IMAC, A Conference on Structural Dynamics, 2012
0865. There are eight imaginary natural frequencies, although three of them are above 100 kHz and three are below 1 Hz. 1i Hz, within the range of the modes of C. First the added mass method was used to correct the mass matrix for this system. 116. The resulting system no longer had the two imaginary natural frequencies in the band of interest. Next the mode scale factor method was employed. 4942. This achieved a positive definite mass matrix. The resulting axial FRF of the axial response of the plate and beam is shown in Fig.
10) demonstrate that the FBS model succeeds in providing reliable predictions for the influence of the hand on a beam with four different push forces. This gives a strong indication that coupling between the hand-arm system and a mechanical structure is possible using this method. The impedances for the Zh-axis posture reveal a strong influence of the hand-arm system for frequencies up to 75 Hz. The FBS predictions also show that the hand with this posture has an influence on the beam up to around 75 Hz for the first mode of the beam.
Response Force Bu1/Bu30 FRFs 0 -180 -360 6 10 FRF magnitude [in s -2 lb-1] Phase [deg] B 5 10 4 10 3 10 Analytical Add Mass MSF 2 10 3 10 Frequency (Hz) 4 5 10 10 Fig. 2 Frequency response function of beam in bending direction after removing the transmission simulator. The blue line shows the analytical FRF computed from the FEA model of the beam alone, while the red and green lines show those of the substructure model estimated after removing the transmission simulator and after adjusting the mass matrix using the Added Mass and Modal Scale Factor approaches (color figure online) Phase [deg] Force B Response Be1/Be30 FRFs 0 -180 -360 6 10 5 FRF magnitude [in s -2 lb-1] 10 4 10 3 10 2 10 Analytical Add Mass MSF 1 10 3 10 Frequency (Hz) 4 10 Fig.