ACTIVE VIBRATION CONTROL OF BREACKUP MODES IN LOUDSPEAKER DIAPHRAGMS

摘要

One of the factors which contribute to the degradation of the sound quality of the loudspeakers are the breakup modes of the membrane since they cause complex directivity patterns, peaks and deeps in the frequency response. This paper presents an active vibration control simulation applied to a 2D Finite Element model of a loudspeaker loaded by a fluid domain to demonstrate an innovative alternative to reduce the amplitude of the breakup modes of loudspeaker diaphragms, improving substantially the mechanical and acoustical performance. The benefits of the controlled system are demonstrated in terms of the acceleration response of the cone and the acoustic directivity.