Acoustics--Measurement of Exterior Noise Emitted By Earthmoving Machinery--Dynamic Test Conditions
This SAE Standard describes a method for determining the noise emitted to the environment by earthmoving machinery in terms of the A-weighted sound power level while the machine is working under dynamic test conditions.
This SAE Standard is special test code for specific types of earthmoving machinery. It is an extension of SAE J2101/ISO 4872, which contains the general requirements for construction equipment.
A simulated dynamic rath than an actual work cycle test condition is chosen. Dynamic test conditions provide acceptable noise emission data, which are repeatable and representative. Actual work cycle tests are complex and repeatability can be a problem
Specific procedures are described in this document to enable the sound power emission in dynamic test conditions to be determined in a manner that is repeatable. Attachments (bucket, dozer, etc.) for the manufacturer's production version are to be fitted since this is the configuration most likely to exist when the machine is in actual use.
This document enables compliance with noise limits to be determined. It can also be used for evaluation purposes in noise reduction investigation.
An additional special test code is given in SAE J2105/ISO 6396.2. This other special test code is intended to be used to determine the noise emitted by earthmoving machiner, with the machine in dynamic test conditions, measured at the operator's position in terms of the equivalent continuous A-weighted sound pressure level.
Corresponding measurements of noise emitted to the environment and noise at the operator's position under stationary test conditions are described in SAE J2102/ISO 6393 and SAE J2103/ISO 6394, respectively.