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Recent development of distributed parameter PVDF vibration sensors obviates the need for accurate and stable schemes to calculate the acoustic power matrix, or radiation matrix R. This entails integration of structural eigenfunctions against a free space Green's function, over a region representing the Cartesian product of the particular structure in question with itself.
In the vibration division finite element methods are being developed to allow calculation of the radiation matrix for nonuniform acoustical structures with arbitrary boundary conditions. These finite elements are then used to effect PVDF filter design techniques, also under development in the division.
The microfactory consists of a small (desktop sized) platform on which is mounted a collection of micromachines, all working in tandem to perform a common goal.
An example of such a machine is the microlathe developed at the Mechanical Engineering Laboratory in Tsukuba, Japan. In the vibration division a model of a microfactory base is suggested, which consists of a magnetically levitated stage, and accompanying control system.
A state-space model for the levitated stage is used to design and test robust control systems for the attenuation of microvibrations inherent in the microfactory base.
