Effect of variants for an Lurban ASEP approach

As requested by the GRB Chairman

GRB feb 2011

Erik de Graaff

Informal document GRB-53-26(53rd GRB, 15-17 February 2011, Agenda item 3(c))

Basic assumptions in analysisas stated by the GRB chairman

• ASEP Methods– Chair-ASEP = slope method doc 2011-02 annex 10 par 3– KBA-ASEP = KBA method doc 2011-02 annex 10 par 4– Lurban-ASEP = accel method doc 2011-02 annex 10 par 6– NL ASEP = doc 2011-08

• KBA always applicable (independent of choice for Lurban/ASEP or Chair/ASEP)

• Acceleration boundaries– Annex 3: 3 m/s2

– ASEP: 5 m/s2

Huge amount of dataHow to clarify in a simple presentation?

If necessary: Formulas

• All factors influencing Lwot,ASEP are mutiplied by a factor 1/(1-kp,ASEP)

• For the example vehicle this factor has a value of 3

• this means– The margin of 3 dB on Lurban translates into a margin of 9 dB on

Lwot

k-1

50) - (v x 0.15 L L x k - 3 L

ASEPp,

ASEPBB,urbancrsASEPp,ASEPWOT,

Huge amount of dataHow to clarify in a simple presentation?

Strategy for this presentation

• No formulas

• One example vehicle

• Three variants of Lurban-ASEP

• For every variant– One graph with the principle– One graph with the data

The example vehiclesound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

Lurban 2

Lurban 3

Lurban 4

D. Moore 5

Blue dots are measured noise levels

The example vehicle

Why this example?Reason 1: sound emission• Not very linear• Jump of 10 dB• Estimated Lmax,nrated

110 dB

sound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

Lurban 2

Lurban 3

Lurban 4

D. Moore 5

resonances

linear

linear

10 dB jump

Estimated Lmax = 110 dB

vehicle 200-49 PMR 159 kW/t

assumed limit A3: 73

Why this example?• Sound emission

– Not very linear– Jump of 10 dB– Lmax,nrated circa 110 dB

• Annex 3 on the edge– R51.02: -0.9 dB– R51.03 +0.7 dB

• Fulfills KBA• Acceleration < 4 m/s2

• Sound emission not everywhere as could be expected from the Annex 3 result

sound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

Lurban 2

Lurban 3

Lurban 4

D. Moore 5

vehicle 200-49 PMR 159 kW/t

The vehicle fails both NL ASEP and Chair ASEP

at various engine speeds

NL ASEP and Chair ASEP differ less than 3 dB

sound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

D. Moore 2

D. Moore 3

D. Moore 4

D. Moore 5

How do the Lurban-ASEP variants perform?

Variant 1 of Lurban-ASEP

Variant 1 for Lurban ASEP3 dB margin on Lurban

65

70

75

80

85

90

0 0,5 1 1,5 2 2,5 3 3,5 4 4,5

Acceleration (m/s2)

no

ise

leve

l (d

B(A

))

Lcruise

Lwot,A3

Lurban

Lwot, ASEP, expected

Lurban + Margin

Lwot,ASEP allowed

Expected behaviorin ASEP

allowed behaviorin ASEP

3 dB Margin

9 dB Margin

Margin on Lwot in 2nd gear = Margin on Lurban multiplied by a factor 3

vehicle 200-49 PMR 159 kW/t

Variant 1 Lurban ASEP:

3 dB margin on Lurban

The vehicle never fails Lurban-ASEP

Limit of Lurban-ASEP is 7 to 10 dB higher than chair-ASEP and up to 15 dB higher than NL ASEP

sound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

Lurban 2

Lurban 3

Lurban 4

D. Moore 5

Variant 2 of Lurban-ASEP

Variant 2 for Lurban ASEP3 dB margin on Lwot

• margin independent of acceleration

65

70

75

80

85

90

0 0,5 1 1,5 2 2,5 3 3,5 4 4,5

Acceleration (m/s2)

no

ise

leve

l (d

B(A

))Lcruise

Lwot,A3

Lurban

Lwot, ASEP, expected

Lwot,ASEP allowed

Expected behaviorin ASEP

allowed behaviorin ASEP

3 dB Margin on Lwot

vehicle 200-49 PMR 159 kW/t

Variant 2 Lurban ASEP:

3 dB margin on Lwot instead of Lurban

The vehicle is a boarder case for Lurban-ASEP

Lurban-ASEP is 0-6 dB more liberal than chair-ASEP and NL ASEP

sound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

Lurban 2

Lurban 3

Lurban 4

D. Moore 5

Variant 3 of Lurban-ASEP

Variant 3 for Lurban ASEP

• Check Lurban-ASEP against Annex3 limit• with 0 dB margin on Limit

65

70

75

80

85

90

0 0,5 1 1,5 2 2,5 3 3,5 4 4,5

Acceleration (m/s2)

no

ise

leve

l (d

B(A

))

Lcruise

Lwot,A3

Lurban

Lwot, ASEP, expected

Annex 3 limit

Lwot,ASEP allowed

Expected behaviorin ASEP

allowed behaviorin ASEP

A3 limit

Alowed Lwot depends on A 3 limitindependent from A3,Lurban result

Variant 3 for Lurban ASEPExample: different Annex 3 result

No effect on ASEP limitASEP limit only depends on Annex 3 limit, not the Annex 3 result

65

70

75

80

85

90

0 0,5 1 1,5 2 2,5 3 3,5 4 4,5

Acceleration (m/s2)

no

ise

leve

l (d

B(A

))Lcruise

Lwot,A3

Lurban

Lwot, ASEP, expected

Annex 3 limit

Lwot,ASEP allowed

Expected behaviorin ASEP

allowed behaviorin ASEP

A3 limit

Alowed Lwot depends on A 3 limitindependent from A3,Lurban result

vehicle 200-49 PMR 159 kW/t

Variant 3 Lurban ASEP:

Check with A3 limit

0 dB margin on A 3 limit

The vehicle fails Lurban-ASEP

Lurban-ASEP limit is comparable to chair-ASEP and NL ASEP

sound emissions R51-ASEP database

60

65

70

75

80

85

90

95

100

0,0 0,2 0,4 0,6 0,8 1,0

engine speed

ma

x W

OT

-SP

L in

dB

(A)

Chair 2

Chair 3

NL 2

NL 3

NL 4

NL 5

R51-02

R51-03 a3

gear 2

gear 3

gear 4

gear 5

D- range

R51-02

R51-03 a3

gear 2 new

gear 3 new

D-range new

KBA-3

KBA-4

Lurban 2

Lurban 3

Lurban 4

D. Moore 5

Discussion

• Chair-ASEP rejects this vehicle

• Lurban ASEP– Variant 1 vehicle passes– Variant 2 boarder case– Variant 3 rejected