effect of variants for an lurban asep approach
DESCRIPTION
Informal document GRB-53-26 (53 rd GRB, 15-17 February 2011, Agenda item 3(c)). Effect of variants for an Lurban ASEP approach. As requested by the GRB Chairman GRB feb 2011 Erik de Graaff. Basic assumptions in analysis as stated by the GRB chairman. ASEP Methods - PowerPoint PPT PresentationTRANSCRIPT
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