ANNEX IIIMETHOD OF MEASUREMENT OF AIRBORNE NOISE EMITTED BY EQUIPMENT FOR USE OUTDOORS
36.LIFT TRUCKS
Basic noise emission standard
EN ISO 3744:1995
Operating conditions during test
Safety requirements and the manufacturer's information shall be observed
Lifting condition
With the truck stationary the load (non-sound absorbent material, e.g. steel or concrete; at least 70 % of the actual capacity stated in the manufacturer's instruction) shall be lifted, from the lowered position, at maximum speed to the standardised lift height applicable to that type of industrial truck in accordance with the relevant European Standard in the series ‘Safety of Industrial Trucks’. If the actual maximum lift height is less, it may be used in individual measurements. The lift height shall be listed in the test report
Drive condition
Drive the truck, without load, at full acceleration from standstill over a distance of three times its length to reach line A-A (line connecting microphone positions 4 and 6), continue driving the truck at maximum acceleration to line B-B (line connecting microphone positions 2 and 8). When the rear of the truck has crossed line B-B, the accelerator may be released
If the truck has a multi-gear transmission, select the gear that ensures the highest possible speed over the measurement distance
Period(s) of observation/determination of resulting sound power level if more than one operating condition is used
The periods of observation are:
for lifting condition: the whole lift cycle;
for drive condition: the time period starting when the truck's centre crosses the line A-A and ends when its centre reaches the line B-B
The resulting sound power level for all types of lift trucks, however, is calculated by
where subscript ‘a’ indicates ‘lifting mode’ and subscript ‘c’ indicates ‘driving mode’