Experiments with PVMaple and Parallel Methods for ODEs

A transducer such as used for an electro-dynamic loudspeaker adapted to convert an electric signal into a mechanical motion or, a moving coil type velocity sensor adapted to convert a mechanical motion into an electric signal. The so-called "Bl force factor," representative of the product of the magnetic flux density B and the length l of the main coil, is so controlled as to be made constant, whereby the linearity of the transducer is improved.