ANSI ARI-530-2005 pdf download RATING OF SOUND AND VIBRATION FOR  REFRIGERANT COMPRESSORS
1.1 Purpose. The purpose of this standard is to establish for the rating of sound and vibration for Refrigerant Compressors: definitions; test requirements; rating requirements; minimum data requirements for published ratings; and conformance conditions.
1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors and users.
1.1.2 Review and Amendment. This standard is subject to review and amendment as technology advances. Section
2. Scope
2.1 Scope. This standard applies to External-drive, Hermetic and Semi-Hermetic Refrigerant Compressors. In the case of External-drive Refrigerant Compressors, the driving mechanism shall be excluded from the sound and vibration measurements. However, for Semi-Hermetic Refrigerant Compressors where the driving mechanism is an integral part of the compressor assembly as defined in Section 3, it shall be included in the measurements.
2.1.1 Exclusion. An External-drive Refrigerant Compressor, coupling and motor assembly mounted on a common base is excluded from this standard, since the vibration measurement method specified in the standard does not apply to this type of product. Section
3. Definitions All terms in this document shall follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air-Conditioning, and Refrigeration unless otherwise defined in this section.
3.1 Acceleration (g). The ratio of acceleration measured at a point on a structure to the gravitational acceleration, 9.807 m/s 2 [386.1 in/s 2 ].
3.2 Amplitude Peak (pk). For sine waves, the peak amplitude is 1.414 times the rms amplitude.
3.3 Amplitude Peak-to-Peak (pk-pk). For sine waves, the peak-to-peak is two times the peak amplitude.
3.4 Comparison Method. A method of determining Sound Power Level of the equipment under test in a reverberation room by comparing the average Sound Pressure Level of that equipment to the average Sound Pressure Level of a Reference Sound Source of known Sound Power Level. The difference in Sound Power Level is equal to the difference in Sound Pressure Level when conditions in the room are the same for both sets of measurements.
3.5 “Flat Top” Window . A weighting function applied during Fast Fourier Transform analysis to obtain the true amplitudes of periodic components of a time signal. It is designed specifically to minimize the amplitude error. It facilitates calibration by using a calibration tone which may lie anywhere between two lines of the analyzer. Maximum amplitude error is less than 0.01 dB. 3.6 Fundamental Frequency. The speed of the compressor drive/shaft expressed in Hz.
3.6.1 Fundamental Pulsation Frequency . The dominant frequency observed in the pressure pulse. For reciprocating compressors, where all events are equally spaced in time, this is usually the number of cylinders times the fundamental frequency.