SAE J1477-2000 pdf download Measurement of Interior Sound Levels of Light Vehicles
Scope–This SAE Recommended Practice establishes the test procedure, environment, instrumentation, anddata analyses for comparing interior sound level of passenger cars, multipurpose vehicles, and light truckshaving gross vehicle weight rating (GVWR) of 4540 kg (10 000 lb) or less.
The test procedure is characterized by having fixed initial conditions (specified initial vehicle speed and gearselection at the startina point on the test site) to obtain vehicle interior sound measurement during road loadoperation over various road surfaces at specified constant speeds.
The measurement data so derived is useful for vehicle engineering development and analysis
Operation–Perform a standard series of tests at 60, 70, 80, 90, and 100 km/h (38, 44, 50, 56, 63 mph) onsmooth (within normal construction practice) level asphalt or equivalent road surface.
Perform special tests at desired speeds on designated road surfaces, and/or with special noise producingsystems operating,as desired
心References
21Applicable Publications–The following publications form a part of the specification to the extent specifiedherein. Unless otherwise indicated, the latest revision of SAE publications shall apply.
2.1.1SAE PUBLICATION-Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J184-Qualifying a Sound Data Acquisition System
2.1.2ANSI AND ISO PUBLICATIONS-Available from ANSl, 11 West 42nd Street, New York, NY 10036-8002.
ANSI S1.4-American National Standard Specification for Sound Level metersISO 5128-Acoustics, measurement of noise inside motor vehicles
2.2 Related Publications—The following publications are provided for information purposes only and are not a required part of this document.
2.2.1 SAE P UBLICATION —Available from SAE, 400 Commonweatlh Drive, Warrendale, PA 1 5096-0001 .
SAE J986—Sound Level for Passenger Cars and Light Trucks
2.2.2 O THER P UBLICATIONS —Available from McGraw-Hill Book Company, New York.
Beranek, Leo L., Noise and Vibration Control, p. 554, 1 971 .
3. Instrumentation—The following instrumentation shall be used:
3.1 Two sound level meters which meet the type 1 or S1 A requirements of the American National Standard Specifications for Sound Level Meters, S1 .4.
3.2 Two condenser type omni-directional microphones.
3.3 A two-channel audio tape recorder (if analyses described in 8.2 are to be obtained) conforming to the requirements of SAE Recommended Practice J1 84a, Qualifying a Sound Data Acquisition System.
3.4 A sound level calibrator accurate to ±0.5 dB.
3.5 An anemometer accurate to ±1 0% at 1 8 km/h (1 1 mph).
3.6 Instrumentation to measure the vehicle speed accurate to ±2% for a desired test condition.
4. Test Site
4.1 The test site shall be a flat open space free of large reflecting surfaces which affect the sound level. No passing vehicles may be in the vicinity of the test vehicle while measurements are being made.
4.2 The test site shall include a vehicle path of sufficient length for safe acceleration, deceleration, and stopping of the vehicle.
SAE J1477-2000 pdf download
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