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Appendix B: Fortran tyre model subroutines 481 C C Relaxation Length is externally imposed as with the C Fiala tyre. C C Tyre Data is taken from the tyre parameter file (.tpf) C but note that not all the data is used. The other C parameters are passed in via the UPARAMETERS argument C on the TIRE statement inside an MSC.ADAMS deck. C C The model is quite empirical and has no basis in any sort C of established fact or theory. It may or may not bear a C passing resemblance to “Maltyre”, a Malcolm Burgess model C implemented at Lotus, although this is unintended. C C (c) DAH 24 Oct 1999 C C A quick note on the comment style. Before the C ‘$$$ EXECUTABLE CODE $$$’ line, the comments are all C as standard in a TIRSUB C After that, process chunks are separated with some blank C lines and an ‘open’ comment. Comments which refer C specifically to the following lines of code start and C end with a double dash (--). C SUBROUTINE TIRSUB (ID, TIME, T0, CPROP, TPROP, MPROP, & PAR, NPAR, STR, NSTR, DFLAG, & IFLAG, FSAE, TSAE, FPROP) C C Inputs: C INTEGER ID, NPAR, NSTR DOUBLE PRECISION TIME, T0 DOUBLE PRECISION CPROP(*), TPROP(*), MPROP(*), PAR(*) CHARACTER*80 STR(*) LOGICAL DFLAG, IFLAG C C Outputs: C DOUBLE PRECISION FSAE(*), TSAE(*), FPROP(*) C C Local Variables: C DOUBLE PRECISION SLIP, ALPHA, DEFL, DEFLD, CAMBER, CG DOUBLE PRECISION R1, R2, CZ, CS, CA, CR, DZ, AMASS, WSPIN C DOUBLE PRECISION ALPHA_C, Ay, By, R_LOAD, dB_dFz, ALPHA_M DOUBLE PRECISION SLIP_C, Ax, SLIP_M, FR_ELLIP, CP_LEN C INTEGER IORD DOUBLE PRECISION ZERO, ONE, SCFACT, DELMAX
482 Multibody Systems Approach to Vechicle Dynamics C DOUBLE PRECISION FX, FY, FZ, FX1, FX2, TX, TY, TZ, H, ASTAR DOUBLE PRECISION FX, FY, FZ, TX, TY, TZ C DOUBLE PRECISION SSTAR, U, FZDAMP, FZDEFL, WSPNMX DOUBLE PRECISION FZDAMP, FZDEFL, WSPNMX DOUBLE PRECISION B, USLIP, SCMIN, LSLIP, TSCALE LOGICAL ERFLG C PARAMETER (ZERO0.0) PARAMETER (ONE1.0) PARAMETER (IORD0) PARAMETER (WSPNMX5.0D-1) C C C$$$$$$$$$$$$$$$$ EXECUTABLE CODE $$$$$$$$$$$$$$$$$$$$$$ C C C Extract data from input arrays C C -- Tyre States at Run-time: -- SLIP CPROP(1) ALPHA CPROP(2) CAMBER CPROP(3) DEFL CPROP(4) DEFLD CPROP(5) WSPIN CPROP(8) C -- Wheel & Tyre Mass, scaled (see manual) -- AMASS MPROP(1) C -- Tyre Properties, from .tpf file -- C Unladen Radius R1 TPROP(1) C Carcase width R2 TPROP(2) C Vertical Stiffness CZ TPROP(3) C Longitudinal Stiffness - not used CS TPROP(4) C Cornering Stiffness - not used CA TPROP(5) C Camber Stiffness - not used CG TPROP(6) C Rolling Resistance Coeffiecient CR TPROP(7) C Damping Ratio in Z (viscous damping) DZ TPROP(8) C Static Friction Coefficient C MU TPROP(9) C Sliding Friction Coefficient C MU_S TPROP(10) C Friction Coefficient at the current slip value U TPROP(11) C -- Tyre Properties from UPAR Array inside MSC.ADAMS Deck--
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Multibody Systems Approach to Vehic
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Multibody Systems Approach to Vehic
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Contents Preface Acknowledgements N
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Contents vii 4.10.1 Problem definit
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Contents ix 8.2.1 Active suspension
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Preface This book is intended to br
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Preface xiii vehicle design process
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Acknowledgements Mike Blundell In d
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Nomenclature xvii {z I } 1 Unit vec
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Nomenclature xix O n Frame for part
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Nomenclature xxi p Magnitude of re
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1 Introduction The most cost-effect
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Introduction 3 subsequent ‘classi
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Introduction 5 Fig. 1.4 Linearity:
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Introduction 7 While apparently a s
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Introduction 9 3. The body yaws (ro
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Introduction 11 Aspiration Definiti
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Introduction 13 Decomposition: Synt
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Introduction 15 The best multibody
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Introduction 17 shows good correlat
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Introduction 19 generated in numeri
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Introduction 21 1.9 Benchmarking ex
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2 Kinematics and dynamics of rigid
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Kinematics and dynamics of rigid bo
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3 Multibody systems simulation soft
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4 Modelling and analysis of suspens
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Modelling and analysis of suspensio
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Tyre characteristics and modelling
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7 Simulation output and interpretat
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Simulation output and interpretatio
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Page 526 and 527: References 503 Blundell, M.V. The m
Page 528 and 529: References 505 Hudi, J. AMIGO - A m
Page 530 and 531: References 507 Palmer, D. Course no
Page 532 and 533: References 509 European ADAMS News
Page 534 and 535: Index Abuse loads, 148 3 g bump, 14
Page 536 and 537: Index 513 Elk Test, 1 El-Nasher, 29
Page 538 and 539: Index 515 generalised translational
Page 540 and 541: Index 517 steer axis inclination, 1
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