SOUND ISOLATING STRUCTURE AND SOUND ISOLATING PLATE

摘要

PURPOSE:To prevent the loss of a function as a sound isolating plate even at the time of opening a hole for air passage at a sound isolating plate by forming a resonance system of an air spring between a sound source and the sound isolating plate and an air quantity in the opening of the sound isolating plate, and setting the resonance frequency of the resonance system as a specific value. CONSTITUTION:An opening 12 is provided at a proximity sound isolating plate 11, and an oil pan 2 and the plate 11 are equipped with the model of a vibration system. The resonance frequency of this resonance system is set so as to be less than almost 1/21/2 of the main frequency components of a sound emitted by a panel sound source. Then, one end of an air spring 15 constituted between the oil pan (sound source face) 2 being the sound source and the adjacent sound isolating plate 11 is connected with an air mass 16 constituted of the opening 12 of the sound isolating plate 11, and the other end is connected with the sound source face 2, so that the mass spring system of one degree of freedom can be constituted. The rate of perforation of the sound isolating plate 11, the radius of the opening 12, and a distance between the sound source face 2 and the sound isolating plate 11 are decided, so that the sound isolating plate 11 can be equipped with a sufficient sound isolating effect.