the next step in tyre modeling
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- Sheena French
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1 Igo Besselink Applicaions of SWIFT-Tyre: he nex sep in yre modeling TNO Auomoive TNO Auomoive: applicaions of SWIFT-Tyre November
2 Conens Relaion beween MDI and TNO Auomoive New developmens for ADAMS 12.0 The SWIFT-Tyre model Esimaing SWIFT-Tyre parameers Applicaions of SWIFT-Tyre: durabiliy sudy cornering uneven roads aircraf landing gear shimmy TNO Auomoive: applicaions of SWIFT-Tyre November
3 Relaion MDI - TNO Auomoive Saring wih ADAMS 12.0: TNO Auomoive will be responsible for he developmen of all ADAMS/Handling Tire models Agreemen covers he yre models: Fiala, 521-Tire, UA-Tire, Pacejka '89 and '94 ADAMS/Aircraf Tire MF-Tyre, MF-MCTyre and SWIFT-Tyre Aciviies: developmen, enhancemens, solving bugs, second line suppor, documenaion, raining... TNO Auomoive: applicaions of SWIFT-Tyre November
4 New in ADAMS MF-MCTyre: Magic Formula model for moorcycles: valid for very large camber angles (up o degrees) already in use for a number of years by hree leading moorcycle manufacurers also suied for vehicle roll-over (!) MF-Daase Libraries: libraries wih Magic Formula coefficiens for car, moorcycle and ligh ruck yres SWIFT-Tyre... TNO Auomoive: applicaions of SWIFT-Tyre November
5 The SWIFT-Tyre model SWIFT developmen we have hree main problem aspecs: bel dynamics involving naural frequencies of ca. 30, 50, 70 Hz and higher road unevennesses: cleas shor wavelengh wheel oscillaions while reaining Magic Formula for seady sae λ pah α' Mz F y TNO Auomoive: applicaions of SWIFT-Tyre November
6 Model lay-ou TNO Auomoive: applicaions of SWIFT-Tyre November
7 Daa requiremens A SWIFT yre propery file conains informaion on: Magic Formula loaded radius and effecive rolling radius conac lengh, enveloping properies relaxaion lenghs ineria of he rigid ring and residual mass siffness and damping of he yre How o obain his daa? TNO Auomoive: applicaions of SWIFT-Tyre November
8 Model validaion Many experimens: drum: -yaw oscillaion -dynamic braking -loaded radius -high speed clea esing -... fla plank machine: -conac lengh -enveloping properies -effecive rolling radius -... TNO Auomoive: applicaions of SWIFT-Tyre November
9 Imporan quesion... Full measuremen programme o deermine all SWIFT parameers will be exensive and ime consuming Do we really have o do all his esing? Possible approaches: limied es programme, depending on applicaion use exising es daa and/or model resuls (FEM) provided by he yre manufacurer esimae coefficiens based on previous ess, pas experience TNO Auomoive: applicaions of SWIFT-Tyre November
10 Esimaing parameers (1) Longiudinal siffness disribuion Experimenal resuls for a number of differen yres indicae: A:B:C = 3:6:1 TNO Auomoive: applicaions of SWIFT-Tyre November
11 Esimaing parameers (2) Conac lengh Based on geomerical consideraions, lieraure, experience TNO Auomoive: applicaions of SWIFT-Tyre November
12 Reducing overhead Maximise commonaliy beween MF-Tyre and SWIFT-Tyre Examples: MF-Tyre (ADAMS 12.0) will use he SWIFT loaded radius formula SWIFT-Tyre uses same Magic Formula as MF-Tyre rigid ring dynamics can be swiched off Also: yre propery files can be used across differen simulaion environmens (e.g. MATLAB/Simulink) TNO Auomoive: applicaions of SWIFT-Tyre November
13 Some applicaions of SWIFT-Tyre... durabiliy sudy cornering uneven roads aircraf landing gear shimmy TNO Auomoive: applicaions of SWIFT-Tyre November
14 Durabiliy sudy Full vehicle model, driving over uneven road a 90 km/h Comparison of verical axle acceleraion: vehicle measuremens full SWIFT-Tyre model SWIFT-Tyre wihou effecive inpus TNO Auomoive: applicaions of SWIFT-Tyre November
15 verical axle acceleraion TNO Auomoive: applicaions of SWIFT-Tyre November
16 Cornering uneven roads quarer car model forward velociy: 72 km/h (20 m/s) road profile: base 1.0 m, heigh m fixed seering angle, range: 0-15 degrees resul: average laeral force TNO Auomoive: applicaions of SWIFT-Tyre November
17 effecive yre characerisics TNO Auomoive: applicaions of SWIFT-Tyre November
18 Aircraf landing gear shimmy simple, bu represenaive landing gear model TNO Auomoive: applicaions of SWIFT-Tyre November
19 Shimmy model Simulaion condiions: forward velociy 270 km/h (75 m/s) shimmy iniiaed by asymmerical spin-up Advanages of SWIFT-Tyre over classical models: (e.g. Von Schlippe, Smiley, ec.) non-linear, includes combined slip relaxaion lengh decreases as funcion of side slip gyroscopic behaviour of he yre bel included TNO Auomoive: applicaions of SWIFT-Tyre November
20 Seady sae characerisics (1) Magic Formula fi aircraf yre: laeral force TNO Auomoive: applicaions of SWIFT-Tyre November
21 Seady sae characerisics (2) Magic Formula fi aircraf yre: self-aligning momen TNO Auomoive: applicaions of SWIFT-Tyre November
22 Simulaion resuls unsable shimmy vibraion: 15 Hz TNO Auomoive: applicaions of SWIFT-Tyre November
23 TNO Auomoive: applicaions of SWIFT-Tyre November
24 TNO Auomoive: applicaions of SWIFT-Tyre November
25 Conclusions TNO Auomoive provides: sae-of-he-ar yre modelling (ailor made) yre esing processing of measuremens, deerminaion of yre parameers (e.g. MF-Tool) yre daases from a library SWIFT-Tyre is a versaile yre model, which can be used for many applicaions! TNO Auomoive: applicaions of SWIFT-Tyre November
26 Quesions? TNO Auomoive Schoemakersraa 97 P.O. Box JA Delf The Neherlands TNO Auomoive: applicaions of SWIFT-Tyre November
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