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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Noise emission of motor vehicles

Automotive

Noise Emission of Motor Vehicles

Prepared for the GRB-meeting

on 21.02.2001

TÜV Süddeutschland Group

1


Noise emission in different gears

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


Noise emission in different gears1

Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

3


Noise emission in different gears2

Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

4


Noise emission in different gears3

Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

5


Noise emission in different gears4

Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

6


Noise emission in different gears5

Automotive

Noise Emission in different Gears

TÜV Süddeutschland Group

7


Tyre road noise influence

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


Questions

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


Noise emission in real traffic

Automotive

Noise Emission in Real Traffic

TÜV Süddeutschland Group

10


Noise emission in real traffic1

Automotive

Noise Emission in Real Traffic

TÜV Süddeutschland Group

11


Lmax versus leq

Automotive

Lmax versus Leq

TÜV Süddeutschland Group

12


Conclusions remarks

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

13


Vehicle speed distributions

Automotive

Vehicle Speed Distributions

TÜV Süddeutschland Group

14


Target accelerations

Automotive

Target Accelerations

TÜV Süddeutschland Group

15


Ece r 51 oica max engine speed

Automotive

ECE R 51 OICA, max. Engine Speed

TÜV Süddeutschland Group

16


Questions1

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


Questions2

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

18


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