AS ISO 6395 pdf download

AS ISO 6395 pdf download.Earth-moving machinery — Determination of sound power level — Dynamic test conditions
1  Scope
This International Standard specifies a method for determining the noise emitted to the environment by earth-moving machinery, measured in terms of the A-weighted sound power level while the machine is operating under dynamic test conditions. It is applicable to earth-moving machinery as specified in Annex A and as defined in ISO 6165.
2  Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3744:— 1) , Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering method for an essentially free field over a reflecting plane ISO 6165, Earth-moving machinery — Basic types — Identification and terms and definitions ISO 6393:2008, Earth-moving machinery — Determination of sound power level — Stationary test conditions ISO 9249, Earth-moving machinery — Engine test code — Net power IEC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3744, ISO 6165 and the following apply. 3.1 time-averaged A-weighted sound pressure level L pA,T A-weighted sound pressure level averaged on an energy basis over the whole measurement period, T 3.2 A-weighted sound power level L WA quantity obtained from the time-averaged A-weighted sound pressure levels averaged over the measurement surface on an energy basis 3.3 basic length l length used to define the radius of the measurement hemisphere Note 1 to entry: The dimension of the basic length, l, is determined in Annex A.3.4  Machine centre point 3.4.1 machine centre point 〈all machines, except those with slewing upper structure〉 midpoint of the basic length, l, at the machine longitudinal centre line 3.4.2 machine centre point 〈machines with slewing upper structure〉 centre of rotation of the upper structure 3.5  Fan speed 3.5.1 maximum working speed of the fan fan speed at which the fan provides maximum cooling performance for the machine under the most severe operating conditions 3.5.2 fan drive with continuous variable fan speed fan drive that varies the fan speed continuously throughout a variable range to minimize its speed for the needed cooling performance in relation to the heat load
4  Instrumentation
The instrumentation shall be capable of carrying out the measurements according to Clause 8. The preferred instrumentation system for acquiring the data is an integrating-averaging sound level meter complying with the requirements of IEC 61672-1 for a class 1 instrument.
5  Test environment
5.1  General For the purposes of this International Standard, the test environment specified in ISO 3744:—, Clause 4 and Annex A, apply. Additional requirements are given in 5.2 to 5.5. Humidity, air temperature, barometric pressure, vibration and stray magnetic fields shall be within the limits specified by the manufacturer of the instrumentation. 5.2  Test site and environmental correction, K 2A For test-site measurement ground surfaces consisting of a hard reflecting plane — such as concrete or non-porous asphalt [(5.3.1 a) and b)] — and having negligible sound-reflecting obstacles within a distance from the source equal to three times the measurement hemisphere radius, it may be assumed that the absolute value of environmental correction, K 2A , is less than or equal to 0,5 dB, and can therefore be disregarded. In this case, K 2A shall be equal to 0 dB. For the all-sand test site [5.3.1 c)], the value of environmental correction, K 2A , shall be determined and used in the sound power calculation.5.3.2  Hard reflecting plane The test area bordered by the vertical projection of the microphones to the ground shall consist of concrete or non-porous asphalt. 5.3.3  Combination of hard reflecting plane and sand The travel path of the machine shall consist of humid sand of grain size up to 2 mm. The minimum depth of the sand shall be 0,3 m. If 0,3 m is not deep enough for track penetration, the depth shall be increased accordingly. The ground surface between the machine and the microphones shall be a hard reflecting plane, as described in 5.3.2. It is possible to use a combination site of minimum size comprising only a single reflecting plane with a sand path along the side. In this case, the machine shall be operated in a forward travel mode twice, each time in the opposite direction, for each of the three microphone positions. The reverse travel mode shall be carried out in the same manner.