1 Scope
This Standard specifies noise limits and measurement method for accelerating motorcycle (except racing car) and moped.
This Standard is applicable to type approval and production consistency examination of motorcycle and moped.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this standard.
GB/T 3785 Electric, Sonic Properties and Measuring Methods for Sound Level Meters
GB/T 5378 General Rules for Running test for Motorcycles and Mopeds
GB/T 6003.1 Test Sieves of Metal Wire Cloth
GB/T 15173 Sound Calibrators
ISO 2599:1983 Iron Ores - Determination of Phosphorus Content - Titrimetric Method
ISO 10534.1:1996 Acoustics - The Determination of Suction Coefficient and Impedance - Impedance Tube Method
ISO 10844:1994 Acoustics - Regulations on Road Surfaces for Acoustics - Measurement of Noise Emitted by Stationary Road Vehicles
3 Terms, Definitions and Symbols
3.1 The following terms and definitions apply to this Standard.
3.1.1 Type Approval Testing
Type Approval Testing refers to the testing for approving the new types of motorcycles or mopeds manufactured by manufacturers.
3.1.2 Product Consistency Inspection Test
Product Consistency Inspection Test refers to the test conducted on batch-manufactured motorcycles and mopeds that have passed the Type Approval Testing according to product consistency inspection.
3.1.3 Background Noise
Background Noise refers to the noise in the testing environment (including wind noise) without the presence of the vehicle noise.
3.1.4 The Exhaust Silencer System
The Exhaust Silencer System refers to the whole set of parts that are needed to control the noise emitted by motorcycle or moped engines.
3.2 Symbols
This standard uses the following symbols.
Vh: Engine displacement;
S: Maximum engine rotational speed;
NA: The stable engine rotational speed of the vehicles being tested when they are approaching the Beginning Line of Acceleration (AA' Line);
Vm: The designed maximum speed of the vehicles being tested;
VA: The stable speed of the vehicles being tested when they are approaching the Beginning Line of Acceleration (AA/ Line);
