The acoustic sound pressure method is used to determine the sound power level and sound energy level of a noise source in an approximate free field environment above a reflecting surface. Scope 1.1 Overview: This standard specifies the method for determining the sound power level or sound energy level of a noise source using the sound pressure level measured on the measuring surface surrounding the sound source (machine or equipment) in an approximate free field environment near one or more reflecting surfaces. Use these measurements to calculate the frequency band or A-weighted sound power level generated by the noise source (or the sound energy level in the case of pulse noise or transient noise). Note: For a given noise source, different shapes of measurement surfaces may result in different estimated sound power levels, and a corresponding noise testing procedure (see GB/T 19052) provides detailed information on the selection of measurement surfaces. 1.2 Types of Noise and Noise Sources The methods specified in this standard are applicable to various types of noise defined in GB/T 19052 (steady-state, non-stationary, fluctuating, burst, etc.). This standard is applicable to various types and sizes of sound sources (such as fixed or slowly moving equipment, devices, machines, components, components, etc.), provided that the measurement conditions are met. Note: This standard may not be applicable to ultra high or ultra long sound sources, such as chimneys, pipelines, transmission machinery, multi source industrial equipment, etc. In this case, the Noise Test Procedure GB/T 19052 provides an alternative method for determining the sound emission of specific noise sources. 1.3 Testing Environment: The testing environment suitable for measurement according to this standard can be located indoors or outdoors, with the measured noise source installed on or near one or more sound reflection planes. The ideal environment is a completely open space with no boundaries or reflective surfaces other than the reflective plane where the noise source is installed (such as a qualified semi anechoic chamber), but in less ideal environments, methods for correction (within a specified range) are specified. 1.4 Measurement uncertainty provides information on the uncertainty of the sound power level and sound energy level at the specified frequency band and A-weighted frequency measured in accordance with this standard. The uncertainty meets the level 2 accuracy (engineering level) of GB/T 19052
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