Effect of variants for an Lurban ASEP approach

Transcription

1 Informal document GRB (53 rd GRB, 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

2 Basic assumptions in analysis as stated by the GRB chairman ASEP Methods Chair-ASEP = slope method doc annex 10 par 3 KBA-ASEP = KBA method doc annex 10 par 4 Lurban-ASEP = accel method doc annex 10 par 6 NL ASEP = doc KBA always applicable (independent of choice for Lurban/ASEP or Chair/ASEP) Acceleration boundaries Annex 3: 3 m/s 2 ASEP: 5 m/s 2

3 Huge amount of data How to clarify in a simple presentation?

4 If necessary: Formulas L WOT,ASEP 3 - k p,asep x L crs + L 1- k urban + p,asep 0.15 x (v BB,ASEP - 50) 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

5 Huge amount of data How 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

6 The example vehicle Blue dots are measured noise levels max WOT-SPL in db(a) sound emissions R51-ASEP database Chair 2 Chair 3 NL 2 NL 3 NL 4 NL 5 R51-03 a3 gear 2 gear 3 gear 4 gear 5 D- range R51-03 a3 gear 2 new gear 3 new D- range new KBA- 3 KBA- 4 Lurban 2 Lurban 3 Lurban 4 D. Moore ,0 0,2 0,4 0,6 0,8 1,0 engine speed

7 The example vehicle Whythisexample? Reason 1: sound emission Not very linear Jump of 10 db Estimated Lmax,nrated 110 db max WOT-SPL in db(a) sound emissions Estimated R51-ASEP database Lmax = 110 db 10 db jump linear linear Chair 2 Chair 3 NL 2 NL 3 NL 4 NL 5 R51-03 a3 gear 2 gear 3 gear 4 gear 5 D- range 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 60 0,0 0,2 0,4 0,6 0,8 1,0 engine speed

8 vehicle PMR 159 kw/t assumed limit A3: 73 Whythisexample? Sound emission Not very linear Jump of 10 db Lmax,nrated circa 110 db Annex 3 on the edge R51.02: -0.9 db R db Fulfills KBA Acceleration < 4 m/s 2 Sound emission not everywhere as could be expected from the Annex 3 result max WOT-SPL in db(a) sound emissions R51-ASEP database Chair 2 Chair 3 NL 2 NL 3 NL 4 NL 5 R51-03 a3 gear 2 gear 3 gear 4 gear 5 D- range 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 0,0 0,2 0,4 0,6 0,8 1,0 engine speed

9 vehicle PMR 159 kw/t sound emissions R51-ASEP database Chair 2 Chair 3 NL 2 The vehicle fails both NL ASEP and Chair ASEP at various engine speeds NL ASEP and Chair ASEP differ less than 3 db max WOT-SPL in db(a) NL 3 NL 4 NL 5 R51-03 a3 gear 2 gear 3 gear 4 gear 5 D-range 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 ,0 0,2 0,4 0,6 0,8 1,0 engine speed

10 How do the Lurban-ASEP variants perform?

11 Variant 1 of Lurban-ASEP

12 Variant 1 for Lurban ASEP 3 db margin on Lurban Lcruise Lwot,A3 Lurban Lwot, ASEP, expected allowed behavior in ASEP Lurban + Margin noise level (db(a)) Lwot,ASEP allowed 3 db Margin 9 db Margin Expected behavior in ASEP 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 Acceleration (m/s2) Margin on Lwot in 2nd gear = Margin on Lurban multiplied by a factor 3

13 vehicle 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 max WOT-SPL in db(a) sound emissions R51-ASEP database Chair 2 Chair 3 NL 2 NL 3 NL 4 NL 5 R51-03 a3 gear 2 gear 3 gear 4 gear 5 D-range R51-03 a3 gear 2 new gear 3 new D-range new KBA- 3 KBA- 4 Lurban 2 Lurban 3 Lurban 4 D. Moore ,0 0,2 0,4 0,6 0,8 1,0 engine speed

14 Variant 2 of Lurban-ASEP

15 Variant 2 for Lurban ASEP 3 db margin on Lwot Lcruise noise level (db(a)) Lwot,A3 Lurban Lwot, ASEP, expected Lwot,ASEP allowed allowed behavior in ASEP 3 db Margin on Lwot Expected behavior in ASEP 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 Acceleration (m/s2) margin independent of acceleration

16 vehicle PMR 159 kw/t Chair 2 sound emissions R51-ASEP database Chair 3 NL 2 NL NL 4 NL 5 Variant 2 Lurban ASEP: 3 db margin on Lwot instead of Lurban 95 R51-03 a3 gear 2 gear 3 gear 4 gear 5 The vehicle is a boarder case for Lurban-ASEP Lurban-ASEP is 0-6 db more liberal than chair- ASEP and NL ASEP max WOT-SPL in db(a) D- range R51-03 a3 gear 2 new gear 3 new D- range new KBA- 3 KBA- 4 Lurban 2 Lurban 3 Lurban 4 D. Moore ,0 0,2 0,4 0,6 0,8 1,0 engine speed

17 Variant 3 of Lurban-ASEP

18 Variant 3 for Lurban ASEP noise level (db(a)) Lcruise Lwot,A3 Lurban Lwot, ASEP, expected Annex 3 limit Lwot,ASEP allowed A3 limit Alowed Lwot depends on A 3 limit independent from A3,Lurban result allowed behavior in ASEP Expected behavior in ASEP 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 Acceleration (m/s2) Check Lurban-ASEP against Annex3 limit with 0 db margin on Limit

19 Variant 3 for Lurban ASEP Example: different Annex 3 result noise level (db(a)) Lcruise Lwot,A3 Lurban Lwot, ASEP, expected Annex 3 limit Lwot,ASEP allowed A3 limit Alowed Lwot depends on A 3 limit independent from A3,Lurban result allowed behavior in ASEP Expected behavior in ASEP 0 0,5 1 1,5 2 2,5 3 3,5 4 4,5 Acceleration (m/s2) No effect on ASEP limit ASEP limit only depends on Annex 3 limit, not the Annex 3 result

20 vehicle PMR 159 kw/t Chair 2 sound emissions R51-ASEP database Chair 3 NL 2 NL NL 4 NL 5 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 max WOT-SPL in db(a) 95 R51-03 a3 gear 2 gear 3 gear 4 gear 5 D- range R51-03 a3 gear 2 new gear 3 new D- range new KBA- 3 KBA- 4 Lurban 2 Lurban 3 Lurban 4 D. Moore ,0 0,2 0,4 0,6 0,8 1,0 engine speed

21 Discussion Chair-ASEP rejects this vehicle Lurban ASEP Variant 1 vehicle passes Variant 2 boarder case Variant 3 rejected