衝撃による振動と音響(I)

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We measured the vibration acceleration at one point of the plate and the sound pressure near the plate surface, using the 2 channel magnetic tape recorder and the 1/3 octave band analyzer. These quantities decrease with time as follows; A=A_0 exp(-αt), where A is the vibration or the sound pressure, A_0 is the initial value of these, and α is the rate of damping. Attention was given to the values of A_0, and following results were obtained. 1) There is an intimate relation between the hammer momentum and the initial value of the acceleration or the sound pressure, and it is shown as the next experimental formula; A_0=K_2 mv^<K1>, where mv is the momentum of the hammer ; K_1 being the coefficient which is a function of frequency, and about 1 at lower frequencies and less than 1 at higher frequency; K_2 is the coefficient which is a function of frequency, momentum of the hammer, rate of concentration of impulsive force and the elastic quantities of the plate and of the hammer, and less than 1. We made assumption on the physical meanings of these coefficients. 2) The relations between the vibration acceleration and the sound pressure are not constant owing to the plate material and its thickness, but it is adventageous to use the accelerometer in order to measure the relations between the sound pressure and the vibration in an audio frequency range, as the acceleration correspond to the sound pressure on the whole. 3) According to the observation of wave form and contact time of the hammer by using a synchroscope, the wave form of the sound pressure is alike that of acceleration rather than that of velocity and displacement, and there is no unique relationship between the contact time and the impulsive force action time.
社団法人日本音響学会の論文
1960-09-30

衝撃による振動と音響(I)

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