* Values as measured on the A-scale of a sound-level meter.
AIR BORNE SOUND ABSORPTION
It is possible to reduce the airborne sound by covering the surfaces (such as walls of a room) with absorbents on the inside. The sound absorbents convert the airborne sound into small amount of heat energy. The another way to reduce propagation and transmission of noise is to insulate the noise source using a wall or hood. The insulation capabilities can also be further improved by using a double wall system. Insulation pads are available with and without a wear resistant surface.
AIR BORNE SOUND INSULATION
One way to reduce the propagation of noise is to insulate the noise source using a wall or hood. The noise insulation capability of a wall increases as it weight increases. The insulation capabilities can also be further improved by using a double wall system. Insulation pads are available with and without a wear resistant surface. The Transmission Loss DTL denotes the reduction expressed in dB as a wall passage.
DAMPING OF STRUCTURE BORNE SOUND
Structure borne sound is vibration in solid materials, generated by a machine, for example. It can be damped by applying a pad on one side or by the sandwich method. In both cases the vibration energy is converted into heat. The loss factor denotes how much of the vibration energy is absorbed. Acoustical Terms Frequency is measured in Hertz (Hz, the number of vibration cycles per second) and denotes the pitch of the sound. 100 Hz is a bass tone with a wavelength of 3 m whereas the wavelength for a frequency of 3,000 Hz is only 1 dm. Decibel (0,1 Bel = 1 dB) is a unit used to express the ratio between two levels of sound. Besides sound pressure (LP), the following magnitudes are expressed in dB: sound intensity (LI), sound power (LW), equivalent average value (Leq). Zero Bel is defined as the lowest limit of audibility. 6 dB higher sound level means a doubling of the sound level. Two independent sound sources of equal power, result in a sound level that is 3 dB higher than a single source. LP dB(A) is an average value across all frequencies in the audible range, adjusted to the sensitivity of the ear to the different frequencies.
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