板状はりスプリングを有するモータの振動放射音の予測および形状変化による騒音制御

概要

論文の詳細を見る
An analysis method and equations are established for calculation of the frequency spectrum and over all value of the sound pressure emitted from a multi-modally vibrating beam, which is excited by the slit of a motor's commutator, by investigating both the forced transient vibration and the free vibration of the beam, and by taking the Fourier transform calculation analytically. We note that in addition to the conventional wave cancellation occurring on the beam surface, a cancellation mechanism exists also in the calculation of the amplitude of the surface velocity because the integral function involved yields both positive and negative values. Hence, it is suggested that by making use of this concept of cancellation of amplitude of velocity, reduction of the volumed surface velocity and emitted sound pressure can be achieved by altering the shape parameters of the structure. Results of experimental studies confirmed the results of the theoretical analysis presented.
一般社団法人日本機械学会の論文
1996-12-25