Sound energy

• Sound pressure
• SPL
• Sound velocity
• Schallauslenkung
• Sound acceleration
• Sound intensity
• Sound power
• Sound energy density
• Sound energy
• Sonic flow
• Acoustic impedance
• Speed of sound

The acoustic energy W is the energy contained in a sound field or sound event. Energy is a physical quantity. Measure of the sound energy is the joule J. The corresponding logarithmic size, the noise energy level.

Definition

Sound vibrations and sound waves are associated with small power movements of particles of the medium in which the sound propagates. Therefore, possess and carry sound waves kinetic energy. Same time there is alternating compression and rarefaction of parts of this medium. This will pick up and release potential energy.

The sound energy from a sound field can be calculated as the sum of kinetic and potential energy. In the case of the propagation of sound in a fluid is considered:

In this case, the sound pressure, the sound particle velocity, the density and the velocity of sound in the fluid.

In addition, the sound energy.

Here, the sound intensity, time, and the flow-through area.

It is often useful, instead of the sound energy to consider the sound energy density as a dependent on the location size. Then also does not have to be integrated over the volume of the sound field in the calculation.

The rate of output of a sound source of sound energy, the sound performance of this source.

The sound energy or sound energy levels are also used for detecting a pulse-like sound phenomenon and is obtained by integrating the sound power over the entire pulse procedure, including the cooldown.

The sound energy variables take on point sound sources with 1/r2 versus distance from.

Sound energy levels

Commonly used is also an indication of the sound energy than noise energy level LI in decibels ( dB):

With the standard reference value ( Acoustic ) W0 = 10-12 J.