AS ISO 9533 pdf download – Earth-moving machinery — Machine- mounted audible travel alarms and forward horns — Test methods and performance criteria

AS ISO 9533 pdf download – Earth-moving machinery — Machine- mounted audible travel alarms and forward horns — Test methods and performance criteria
1Scope
This International Standard specifies a static method for determining the sound output performanceand alarm activation requirements of audible travel alarms and forward horns mounted on earth-moving machinery, as defined in IS0 6165, for operation on work sites and travelling on public roads. Itoffers objective test methodologies and performance criteria.
lt is applicable only to those alarms and horns that are installed on the earth-moving machinery. Itdoes not specify the installation of one or more audible travel alarms or forward horns on particularmachines. it addresses neither the laboratory testing of warning alarm functionality nor durability.NOTE Earth-moving machine manufacturer’s practices, worksite requirements and local, national or regionalregulations could require the fitting of the alarms or horns specified in this International Standard.
2Normative references
The following referenced documents are indispensable for the application of this document. For datedreferences,only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.
ISO 3411,Earth-moving machinery ― Physical dimensions of operators and minimum operatorspace envelope
ISO 6165,Earth-moving machinery — Basic types — ldentification and terms and definitions
ISO 6746-1,Earth-moving machinery —Definitions of dimensions and codes — Part 1: Base machineIEC 61672-1,Electroacoustics —Sound level meters — Part 1: Specifications
3Terms and definitions
For the purposes of this document, the following terms and definitions apply.3.1
machine reference boxMRB
imaginary rectangular box that would just fit over the base machine according to lS0 6746-1, whichexcludes all equipment and attachment items such as buckets, dozers, backhoes,rippers and booms3.2
audible travel alarm
machine-mounted audible alarm intended to warn or alert personnel of the potential hazard of themachine travelling under its own power
3.2.1
travel warning alarm
audible signal intended to warn or alert personnel, especially those near a machine, that the machinehas been activated to travel under its own power
Note 1 to entry:These alarms are normally associated with machines that have rotating upper structures.3.2.2
reverse warning alarm
audible signal intended to warn personnel, especially those near the rear of a machine, that the machinehas been activated to travel in a rearward direction under its own power
3.3
forward horn
audible signal activated by the operator of the machine intended to alert personnel near a machine, butespecially near the front of the machine
Note 1 to entry: A forward horn or horns can also be used as part of a theft or security alarm system forthe machine.
3.4
fixed sound level alarm
audible travel alarm that produces a sound level independent of ambient sound levels3.5
self-adjusting sound level alarm
audible travel alarm that automatically adjusts its sound level, throughout a defined range, in orderto maintain a sound level differential between the output of the alarm and the ambient sound levelmeasured by the alarm
3.6
ambient sound
all sounds in the test area not produced by the audible travel alarm(s)3.7
free field
space with no reflecting surface within 30 m of the sound source or microphone in any direction exceptfor the horizontal reflecting plane on which the test machine is located
4 Apparatus
4.1Sound level meter with an extension cable or equivalent sound measurement system that meetsthe performance requirements of IEC 61672-1,Type 1.
lt is recommended that for the purposes of this International Standard all sound pressure levelmeasurements be rounded to the nearest whole number in decibels.
4.2 Acoustical calibrator, or equivalent measurement system, recommended to be used each day ofmeasurement to calibrate the sound level meter prior to testing and for checking sensitivity drift aftertest completion. The effects of atmospheric pressure, temperature and use of a windscreen should beaccounted for within the system calibration as recommended by the manufacturer of the instrumentation.
4.3 Microphone wind screen,designed for sound measurement and recommended by themanufacturer of the sound level meter or equivalent sound measuring system, which shall be used tomaintain consistency from test to test and add protection to the microphone assembly.
4.4 Anemometer, or other device, for measuring ambient wind speed and direction, accurate towithin ±10 % at the highest recommended wind speed.
4.5 Engine rotational frequency indicator with an accuracy to within ±2 % of the indicated enginerotational frequency.