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Tyre characteristics and modelling 325 Interpolation data there is little to distinguish between the two sets of curves. The plots also indicate that the ‘Magic Formula’ can accurately represent offsets in lateral force at zero slip angle due to ply steer and conicity. Looking at the plots for the Fiala model it can be seen that the model underestimates lateral force where higher slip angles coincide with higher wheel loads. These plots also confirm that the Fiala model is ignoring lateral force offsets at zero slip angle. The case study here is presented as an example of good practice to interrogate a tyre model and parameters before incorporation in a vehicle simulation exercise. The comparison of lateral force variation with slip angle and load shown here can be extended using the virtual rig to consider the effects of camber angle, braking, traction and combinations thereof on the significant forces and moments predicted by the model.
6 Modelling and assembly of the full vehicle 6.1 Introduction In this chapter we will address the main systems that must be modelled and assembled to create and simulate the dynamics of the full vehicle system. The term ‘full vehicle system’ needs to be understood within the context of this textbook. The use of powerful modern multibody systems software allows the modelling and simulation of a range of vehicle subsystems representing the chassis, engine, driveline and body areas of the vehicle. This is illustrated in Figure 6.1 where it can be seen that multibody systems models Test rigs Road Driver Full Vehicle Chassis Engine Driveline Body Suspension Steering Brakes Tyres Valvetrain Cranktrain Chain/Belt Acc.Drives Transmission Clutch Differential Axles/CV Body-in-white Frame Seating Restraints Fig. 6.1 Integration of subsystems in a full vehicle model (provided courtesy of MSC.Software)
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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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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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down and even more difficult to asc
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8 Active systems 8.1 Introduction M
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Active systems 443 mechanical actua
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Active systems 445 Table 8.1 MSC.AD
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Active systems 447 Body acceleratio
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Active systems 449 impressions of t
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Active systems 451 For this reason,
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Appendix A: Vehicle model system sc
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Appendix B: Fortran tyre model subr
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Appendix C: Glossary of terms Agili
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Appendix C: Glossary of terms 489 a
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Appendix C: Glossary of terms 491 t
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Appendix C: Glossary of terms 495 m
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Appendix C: Glossary of terms 501 s
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References 503 Blundell, M.V. The m
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References 505 Hudi, J. AMIGO - A m
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References 507 Palmer, D. Course no
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References 509 European ADAMS News
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Index Abuse loads, 148 3 g bump, 14
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Index 513 Elk Test, 1 El-Nasher, 29
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Index 515 generalised translational
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Index 517 steer axis inclination, 1
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