Abstract: Rare earth magnetostrictive transducer was a power to be able to convert electrical energy into sound energy.Terfenol-D bar was the driving force of the magnetostrictive transducer,it would produce a continuous axial vibration excitation by a magnetic field,thus promoting the radiant panel radiated sound field to a resonant cavity.Analyzed Terfenol-D bar by applying finite element software ATILA modal and harmonic response analysis module.Emphasis on the effects of Terfenol-D bar aspect ratio,excitation current and prestressed on the output characteristics(the frequency and the amplitude value when the magnetic rod in the piston modes).The results show that:magnetostrictive transducer may be due to demand conditions,select a different aspect ratio of Terfenol-D bar to reached the desired axial displacement of the output;output axial displacement Terfenol-D bar increased with external excitation current gradually;when the excitation current is constant,the appropriate size of prestressing can effectively increase the axial displacement output of the Terfenol-D bar,but too much will affect the prestressing Terfenol-D bar axial displacement output.

Key words: transducer, Terfenol-D bar, aspect ratio, excitation current, prestressed