ISO 18654:2016 download.Machinery for forestry – Noise test code.
This noise test code specifies al the information necessary for carrying out efficiently and under standardised conditions the noise emission values of self-propelled rorestry machinery. Ills applicable to fellers, bunchers, delimbers, forwarders, log loaders, skidders, processors, harvesters, muichers and multi-function versions of these machine types, as defined in ISO 6814.
Noise emission characteristics include A-weighted emission sound pressure values at the operator’s station and the A-weighted sound power value. The determination of these quantities is necessary for the following:
— manufacturers to declare the noise emitted;
— comparing the noise emitted by machines In the family concerned;
— purposes of noise control at the source at the design stage.
NOTE For low-noise design, noise emission values In frequency bands are useful and the basic International Standards ISO 3744 and ISO 11201 can be used for determrnlng noise emission quantities in frequency bands.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies, For undated references, the latest edition of the referenced document (including any amendments) applies..
ISO 3744:2010, Acoustics — Determination of sound power levels and sound energy levels of noise sources using sound pressure — Engineering methods for an essentially free field over a reflecting plane
ISO 4871, AcoustIcs — Declaration and verification of noise emission values of machinery and equipment
ISO 5353, Earth-moving machinery, and tractors and machinery for agriculture and forestry — Seat index point
ISO 6395:2008, Earth-moving machinery — Determination of sound power level — Dynamic test conditions
ISO 6396:2008, Earth-moving machinery — Determination of emis.sion sound pressure level at operator’s position — Dynamic test conditions
ISO 11201, Acoustics — Noise emftred by machinery and equipment — Determination of emission sound pressure levels at a work station and at other specified posit Ions in an essentially free field over a reflecting plane with negligible environmental corrections
3 Emission sound pressure level determination at the operator’s station
3.1 For the measurement of the A.weighted emission sound pressure levels, ISO 11201 shall be used,
3.2 The lollowing emission sound pressure levels shall be determined at the operator’s station:
S Installation and mounting conditions
5,1 The machine Installation and mounting conditions as specified by the manufacturer in the instruction handbook shall be applied.
5.2 For the purposes of this International Standard, the test environment specified in ISO 3744:2010. Clause 4 and Annex A, apply Additional requirements are given in 5,3 to 5.6.
Humidity, air temperature, barometric pressure, vibration and stray magnetic fields shall be within the limits specified by the manufacturer of the instrumentation.
5.3 The test area shall be a hard reflective surface defined as an area bordered by the vertical projection of the microphones to the ground consisting of concrete or non-porous asphalt.
5.4 The requirements for background noise, as specified in ISO 3744. shall be fulfilled. Corrections for background noise shall be made as specified in ISO 3744:2010.8.3.2.
5.5 Measurements shall not be carried out under the Following conditions:
a) when there is precipitation. Ic. rain, snow or hail;
h) when the ground surface is covered with snow;
c) when the temperature is below —10 C or above +35 C:
d) when the wind speed exceeds 8 m/s; for wind speeds in excess of I rn/s. a microphone windscreen shall be used and appropriate compensation for the effect of its use allowed for when calibrating.
5.6 For test-site measurement ground surfaces consisting of a hard reflecting plane, such as concrete or nonporous asphalt (5.1). 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, KZA. is less than or equal to 0.5 dB, and can therefore be disregarded. In this case, K2A shall be equal to 0dB.
6 Operating conditions
6.1 The operating conditions shall be the same for the determination of both A-weighted emission sound pressure values at the operator’s station and the exterior A-weighted sound power value at specified conditions unless otherwise stated below.
Unless otherwise specified, all machines shall be stationary with the tools operating, unloaded, idling at the 75 * 5 % of manufacturer’s rated maximum efficiency engine speed. The machine shall be properly warmed up and stabilized at the normal operating temperature before testing starts.
Adjustments shall be made to ensure that no tools cause additional noise through an unintentional mechanical contact.
If a cab is fitted, the sound pressure level shall be measured with all openings, doors, windows, hatches and windscreen closed.
Measurements shall be taken with the air-conditioning and/or ventilation system(s) in operation. If there is more than one operating speed available, theair conditioningand/or the pressurized ventilation system(s) shall be operated at the second speed For systems with up to four speeds.
For systems wIth more than four speeds, the third speed shall be used and, for systems with Infinitely variable speeds, the mid-range speed.
7.9.4.1 The measurement procedure applies whether or not the machine is fitted with a cab.
Ia cab is fitted, the sound pressure level shall be measured with all openings, doors, windows, hatches and windscreen closed.
An additional optional set of measurements may be taken with all openings open, provkling that they have been designed to operate in the open position and that they do not cause a hazard during normal use of the machine. The exception to this is that the windscreen shall remain closed.
When the measurements are being made, parts which normally operate at the same time as the engine (e.g. engine cooling fan) shall be functioning, but extra equipment powered by the engine or self- powered (e.g. windscreen wipers, heating and ventilating fans, power La ke-off) shall not be functioning.
7.9.4.2 Additional noise measurements may optionally be made with the engine running at maximum speed and all auxiliary air-conditioning equipment working. The heating or ventilating fans shall run at the maximum setting
7.9.4.3 Additional noise measurements may optionally be made with the engine stopped and ventilating fans, defrosters and other electrical facilities, etc. working at maximum settings. It shall be confirmed that at least the nominal energy input of the auxiliary equipment is applied to the equipment terminals.
7.9.5 During sound pressure measurement at the operator’s place, the microphone shall be placed at that side of the operator giving the higher sound pressure level
The A-weighted sound pressure level and, optionally, octave-band pressure levels shall be measured and reported at the following modes of operation:
a) driving forwards in the highest gear at no load with the governor control lever fully open;
b) driving forwards at no load with the governor control lever fully open, in the gear giving a speed as near as possible to 4 km/h at the manufacturer’s rated engine speed.
When, optionally, octave-band sound pressure levels are measured, it is recommended that the machine be operated under the mode of operation which gives the highest sound pressure level.
7.9.6 For the determination of forwarding sound, power measurements shall follow ISO 6395:2008, Clause 6.
8 Measurement uncertainties
8.1 Tests shall be repeated to attain the required grade of accurac)c and until three consecutive A-weighted results give values within I dB. The arithmetic average of these three values shall be taken as the final measured value.
8.2 Unless otherwise stated.
— the measurement uncertainty of the determination of A’welghted sound power Levels using this document shall be that specified in ISO 3744;
— the measurement uncertainty of the determination of A-weighted emission sound pressure levels at operator’s stations using this document shall he according to ISO 11201 (value of the standard deviation of reproducibility equal to 2.5 dB).