The reverberation times and the mean sound absorption coefficients before and after the sound absorption treatment are calculated, and the acoustics of the theatre are discussed by comparing the reverberation time before and after the sound absorption treatment.
This paper, from the view of sound absorption treatment, control of background noise and reflected sound, ect, analyses the possibility and condition of the compatibility of internal combustion engine running room with the room for determining noise power.
This article briefly introduces the sound insulation of studio and introduces the interior sound composition, the sound absorption treatment in studio and the size of studio in detail.
This paper, from the view of sound absorption treatment, control of background noise and reflected sound, ect, analyses the possibility and condition of the compatibility of internal combustion engine running room with the room for determining noise power.
Based on the principle of diminishing sound level and its impact factors of indoor sound barriers, to design a scheme for treating noise pollution in group blower, and introduce a design of fixed and activating barriers, and then calculate the noise level being diminished.
On the basis of analyzing the pump noise of the tier-building structure basement, the pollution of the pump noise is well controlled and the remarkable result of noise reduction is achieved by isolating base vibration, reducing pipe vibration, absorbing voice and improving the work state of the pump system.
It is shown that acoustic treatment of piezoelectric zinc selenide crystals by exciting strong natural elastic vibrations can specifically alter their photoelectric and other properties.
By selecting the optimum extraction conditions and using acoustic treatment, it is possible to achieve a considerable (~48 %) increase in the efficiency of extraction with a significantly reduced extraction time.