AS 2012.1-1990

1 - AS 2012.1-1990 ACOUSTICS - MEASUREMENT OF AIRBORNE NOISE EMITTED BY EARTH-MOVING MACHINERY AND AGRICULTURAL TRACTORS - STATIO
4 - PREFACE
4 - CONTENTS
5 - 1 SCOPE
5 - 2 REFERENCED DOCUMENTS
5 - 3 DEFINITIONS
5 - 3.1 Equivalent continuous A-weighted sound pressure level (LAeq,
6 - 3.2 A-weighted sound power level (LWA )
6 - 3.3 Earth-moving machine
6 - 3.4 Agricultural tractor
6 - 4 INSTRUMENTATION
6 - 4.1 General
6 - 4.2 Frequency weighting
6 - 4.3 Time weighting
6 - 4.4 Microphone
6 - 4.5 Calibration
6 - 4.6 Field checks
6 - 5 TEST ENVIRONMENT
6 - 5.1 General
6 - 5.2 Test site surface
7 - 5.3 Air temperature
7 - 5.4 Humidity
7 - 5.5 Wind speed
7 - 5.6 Background noise
7 - 5.7 Signal devices
7 - 5.8 Personnel
7 - 6 MEASUREMENT OF EQUIVALENT CONTINUOUS A-WEIGHTED SOUND PRESSURE LEVELS
7 - 6.1 Size of measurement surface
7 - 6.2 Microphone positions on the hemispherical measurement surface
7 - 6.3 Positioning of the machine
7 - 6.4 Measurement time
7 - 6.5 Corrections for background noise
9 - 7 SETTING-UP AND OPERATION OF MACHINERY
9 - 7.1 Safety and operation
9 - 7.2 Setting-up of the machine
10 - 7.3 Machine operating condition
10 - 7.4 Machine operating sequence
10 - 8 ACOUSTICAL MEASUREMENTS AND CALCULATIONS
10 - 8.1 Equivalent continuous A-weighted sound pressure level (LAeq,
10 - 8.2 Number of measurements
10 - 8.3 Calculation of equivalent continuous A-weighted sound pressure level averaged over the measurement surface
10 - 8.4 Calculation of A-weighted sound power level
10 - 8.5 Determination of measurement result
10 - 9 INFORMATION TO BE RECORDED
10 - 9.1 Machinery under test
10 - 9.2 Acoustic environment
11 - 9.3 Instrumentation
11 - 9.4 Acoustical data
11 - 10 INFORMATION TO BE REPORTED
12 - APPENDIX A - TEST ENVIRONMENT
12 - A1 GENERAL
12 - A2 PROPERTIES OF REFLECTING PLANE
12 - A3 ENVIRONMENTAL CORRECTION FOR REFLECTING AND NON-REFLECTING SURFACES
12 - A4 BACKGROUND NOISE
12 - A5 METEOROLOGICAL CONDITIONS AND ALTITUDE OF TEST SITE

Describes a method for determining the exterior noise emitted by earth-moving machinery and agricultural tractors in terms of the A-weighted sound power level while the machine is stationary.

This Standard describes a method for determining the exterior noise emitted by earth-moving machinery and agricultural tractors in terms of the A-weighted sound power level while the machine is stationary. At six positions on a hemispherical surface, the equivalent continuous A-weighted sound pressure levels are measured. The A-weighted sound power level of the machinery is calculated from the measured values. This Standard applies to the following types of machinery:(a) Agricultural tractors.(b) Crawlers and wheeled excavators.(c) Crawlers and wheeled loaders.(d) Crawlers and wheeled dozers.(e) Backhoe loaders.(f) Graders.(g) Compactor/rollers.(h) Four-wheel drive skid-steer machines.