| Popis: |
When a vibration test is performed, the dynamic modes of a shaker or shaker table may be excited, changing the response of the parts depending on their location on the shaker and possibly invalidating the test. However, shaker systems are difficult to model because of joints with unknown properties, unknown stiffness and damping effects of the magnetic field and because drawings of the internal components are rarely available. This work explores the use of experimental/analytical substructuring to create a test based model of a shaker. A modal test was performed and a modal model of a shaker was obtained with an adapter plate attached. This was coupled to a finite element model of the adapter plate, and the Transmission Simulator Method was used to assemble the two and to remove one copy of the adapter plate. The model thus obtained can then be used to predict the variation in the environment across the top of the shaker as different components are connected. |
