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The acoustic power emitted by an oscillating element (acoustic radiator) as sound in air. It cannot be measured directly. Instead, it is calculated using the sound pressure or noise intensity and the

On a logarithmic scale, this states the entire sound power W emitted from an acoustic radiator in relation to a specific output W o of 1 pW. The sound power level is therefore a machine-specific varia

The various methods of noise measurement. are available to determine the sound power. The calculation of the sound power may be performed by measuring the sound pressure in a soundproof room or in a f

The compression pressure of the air, which overlays the atmospheric pressure when the sound waves spreads. It is measured as an effective pressure in N/m2, but is stated in Decibels (dB) as a noise le

Logarithmic sound pressure p, in relation to the sound pressure p o The reference sound pressure p O (pO = 20 μPa) is equal to the noise pressure of the human hearing threshold level at 1000 Hz in dB.

The sound pressure measured is not the same as that received by the human ear. To balance this out, the measured result is subjected to a method known as A-weighting. Here, the signal is amplified dif

In general : Device, which reduces the pressure (pulsation) fluctuations and therefore reduces the noise produced in connection with this, without preventing the transport of the fluid. In hydraulics

Intake characteristic

Valve, which in the case of valve-controlled (piston) pumps, opens due to the vacuum cased by the reverse pistons and allows hydraulic fluid to flow through afterwards. In the lower reversal point of

Line connected to the intake port of a hydraulic pump or compressor and permits the transport of hydraulic fluid.