Noise emission of motor vehicles
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Noise Emission of Motor Vehicles PowerPoint PPT Presentation

Automotive. Noise Emission of Motor Vehicles. Prepared for the GRB-meeting on 21.02.2001. TÜV Süddeutschland Group. 1. Automotive. Noise Emission in different Gears. Examples: Small car (1,2 l, 40 kW, 73 dB(A)), Medium sized car (1,8 l, 110 kW, 71 dB(A)),

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Noise Emission of Motor Vehicles

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Automotive

Noise Emission of Motor Vehicles

Prepared for the GRB-meeting

on 21.02.2001

TÜV Süddeutschland Group

1


Automotive

Noise Emission in different Gears

Examples:

  • Small car (1,2 l, 40 kW, 73 dB(A)),

  • Medium sized car (1,8 l, 110 kW, 71 dB(A)),

  • High performance car (4 l, 210 kW, 70 dB(A)),

  • Diesel car (2,2 l, 92 kW, 71 dB(A)),

  • Old car (1,3 l, 64 kW, 80 dB(A), 1972),

  • Light duty vehicle (2,9 l, 75 kW, 75 dB(A))

TÜV Süddeutschland Group

2


Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

3


Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

4


Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

5


Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

6


Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

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Automotive

Tyre/Road Noise Influence

  • Average tyre noise influence on overall result:

    • ECE R 51: 35%,

    • Gov-D prop: 45%,

    • OICA prop: 64%,

    • Gov-NL prop:61%

TÜV Süddeutschland Group

8


Automotive

Questions

  • Which noise source shall be addressed ?

    • Mainly Propulsion Noise ?

    • Propulsion and tyre/road noise ?

  • Is it meaningful to include a constant speed test if the result is dominated by tyre/road noise ?

  • Is it meaningful to include tyre/road noise if the manufacturer can choose the test tyre ?

  • Wouldn‘t it be better to reduce the tyre contribution as much as possible ?

TÜV Süddeutschland Group

9


Automotive

Noise Emission in Real Traffic

TÜV Süddeutschland Group

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Automotive

Noise Emission in Real Traffic

TÜV Süddeutschland Group

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Automotive

Lmax versus Leq

TÜV Süddeutschland Group

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Automotive

Conclusions/Remarks

  • ECE R 51 values are poorly correlated with Leq

  • Gearshift behaviour is engine speed related rather than vehicle speed related

  • Objective of amendment of ECE R 51 needs to be clarified

TÜV Süddeutschland Group

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Automotive

Vehicle Speed Distributions

TÜV Süddeutschland Group

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Automotive

Target Accelerations

TÜV Süddeutschland Group

15


Automotive

ECE R 51 OICA, max. Engine Speed

TÜV Süddeutschland Group

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Automotive

Questions

  • What type of roads shall be addressed ?

    • Residential streets ?

    • Urban main streets ?

  • What vehicle speed range shall be used ?

  • How shall the target acceleration be defined ?

  • What is the limit to avoid suboptimisation of tyres ?

TÜV Süddeutschland Group

17


Automotive

Questions

  • A partial load test would be representative but would this be suitable to test the quality of silencers ?

  • Is a fixed vehicle speed suitable for the acceleration test since the gearshift behaviour is engine speed related rather than vehicle speed related ?

  • What is the final target ?

    • A quiet vehicle ?

  • Are additional specifications necessary to avoid cycle bypassing ?

TÜV Süddeutschland Group

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