Improvement of the Vibration Isolation System Modeling Capabilities of the VAST and VIMGEN Codes


  1. Jiang, L.
  2. Polak, M.F.
  3. Haddow, J.B.
  4. Koko, T.S.
  5. Chernuka, M.W.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
The report describes a recent improvement of the vibration isolation system modelling capabilities of the VAST and VIMGEN programs. This improvement included implementation of a complex version of the sparse direct matrix solver in VAST for frequency response and complex eigenvalue analyses, and an automated procedure in VIMGEN for evaluating real and complex condensed stiffness matrices of practical vibration mounts with or without static compression. An analytical model for rolled dielectric polymer actuators was developed. This analytical model has been implemented in both Fortran and Matlab and has been successfully integrated into VIMGEN. The active control simulation program in the VVES (Vibration of Visco-elastic and Elastic Structures) suite, named VVESActive, was incorporated in VIMGEN and all the VVES programs were compiled into DLL using a Matlab compiler, which could be executed without the Matlab program. All the new capabilities developed in this work were carefully verified through extensive numerical study and the test results were also presented in this report. During this development, a number of weaknesses in the analytical model of the dielectric polymer actuators and the VVES programs were identified, which need to be addressed in the future phase of the project.

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Report Number
DRDC-ATLANTIC-CR-2005-035;MARTEC-TR-03-39 — Contractor Report
Date of publication
01 Mar 2005
Number of Pages
Electronic Document(PDF)

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