A concise reference that provides an overview of the design of high speed off-road vehicles
High Speed Off-Road Vehicles is an excellent, in-depth review of vehicle performance in off-road conditions with a focus on key elements of the running gear systems of vehicles. In particular, elements such as suspension systems, wheels, tyres, and tracks are addressed in-depth. It is a well-written text that provides a pragmatic discussion of off-road vehicles from both a historical and analytical perspective. Some of the unique topics addressed in this book include link and flexible tracks, ride performance of tracked vehicles, and active and semi-active suspension systems for both armoured and unarmoured vehicles.
The book provides spreadsheet-based analytic approaches to model these topic areas giving insight into steering, handling, and overall performance of both tracked and wheeled systems. The author further extends these analyses to soft soil scenarios and thoroughly addresses rollover situations. The text also provides some insight into more advanced articulated systems.
High Speed Off-Road Vehicles: Suspensions, Tracks, Wheels and Dynamics provides valuable coverage of:
* Tracked and wheeled vehicles
* Suspension component design and characteristics, vehicle ride performance, link track component design and characteristics, flexible track, and testing of active suspension test vehicles
* General vehicle configurations for combat and logistic vehicles, suspension performance modelling and measurement, steering performance, and the effects of limited slip differentials on the soft soil traction and steering behavior of vehicles
Written from a very practical perspective, and based on the author's extensive experience, High Speed Off-Road Vehicles provides an excellent introduction to off-road vehicles and will be a helpful reference text for those practicing design and analysis of such systems.
Autorentext
BRUCE MACLAURIN initially worked in the aircraft industry on structural design and analysis and then spent over 35 years on the research and design of the automotive systems of military vehicles. His main area of research is tracked and wheeled vehicle steering systems, suspensions and tracks including design, computer modelling, and performance measuring. He is now retired from the Ministry of Defence in the UK.
Klappentext
HIGH SPEED OFF-ROAD VEHICLES
A concise reference that provides an overview of the design of high speed off-road vehicles
High Speed Off-Road Vehicles is an excellent, in-depth review of vehicle performance in off-road conditions with a focus on key elements of the running gear systems of vehicles. In particular, elements such as suspension systems, wheels, tyres, and tracks are addressed in-depth. It is a well-written text that provides a pragmatic discussion of off-road vehicles from both a historical and analytical perspective. Some of the unique topics addressed in this book include link and flexible tracks, ride performance of tracked vehicles, and active and semi-active suspension systems for both armoured and unarmoured vehicles.
The book provides spreadsheet-based analytic approaches to model these topic areas giving insight into steering, handling, and overall performance of both tracked and wheeled systems. The author further extends these analyses to soft soil scenarios and thoroughly addresses rollover situations. The text also provides some insight into more advanced articulated systems.
High Speed Off-Road Vehicles: Suspensions, Tracks, Wheels and Dynamics provides valuable coverage of:
- Tracked and wheeled vehicles
- Suspension component design and characteristics, vehicle ride performance, link track component design and characteristics, flexible track, and testing of active suspension test vehicles
- General vehicle configurations for combat and logistic vehicles, suspension performance modelling and measurement, steering performance, and the effects of limited slip differentials on the soft soil traction and steering behavior of vehicles
Written from a very practical perspective, and based on the author's extensive experience, High Speed Off-Road Vehicles provides an excellent introduction to off-road vehicles and will be a helpful reference text for those practicing design and analysis of such systems.
Inhalt
Series Preface xiii
Acknowledgements xv
Introduction xvii
1 Tracked Vehicle Running Gear and Suspension Systems 1
1.1 General Arrangement 1
1.2 Transverse Torsion Bars 2
1.3 Coil Springs 6
1.4 Hydrogas Suspensions 8
1.4.1 Challenger MBT Hydrogas Unit 8
1.4.2 Measured Characteristics of a Challenger Unit 9
1.4.2.1 Spring Characteristics 9
1.4.2.2 Damper Characteristic 11
1.4.2.3 Differential Pressure Across the Damper Valve 11
1.4.2.4 Force/Displacement Loop 11
1.4.2.5 Flow Rig 12
1.4.2.6 Suspension Damping of a Multi?]Wheeled Vehicle 13
1.4.3 Temperature Effects 13
1.4.3.1 Two?]Stage Units 15
1.4.3.2 Counter?]Spring Units 17
1.4.4 Other Types of Hydrogas Suspension 18
1.4.4.1 Twin?]Cylinder Units 18
1.4.4.2 In?]Arm Units 18
1.5 Dampers 20
1.5.1 Hydraulic Dampers 20
1.5.2 Friction Dampers 20
References 22
2 Vehicle Track Systems 23
2.1 Link Tracks 23
2.1.1 Single?]Pin Tracks 26
2.1.1.1 Dry?]Pin Tracks 26
2.1.1.2 Rubber?]Bushed Tracks 27
2.1.2 Double?]Pin Tracks 28
2.1.3 Rubber Track Pads, Road Wheels and Track Tensioners 31
2.1.3.1 Rubber Track Pads 31
2.1.3.2 Road Wheels 32
2.1.3.3 Track Tensioners 33
2.1.4 Track Loadings 33
2.1.4.1 Centrifugal Tension 34
2.1.4.2 Final?]Drive Torque Measurements 34
2.1.4.3 Lateral Horn Load 35
2.1.5 Rolling Resistance: Analytical Methods 35
2.1.5.1 On a Metal Wheel Path 35
2.1.5.2 On a Rubber Wheel Path 36
2.1.6 Rolling Resistance: Experimental Measurements 37
2.1.6.1 Chieftain 38
2.1.6.2 FV 432 39
2.1.6.3 Scorpion and Spartan 40
2.1.6.4 Summary 42
2.1.7 Noise and Vibration 42
2.1.8 Approaches for Reducing Noise and Vibration 43
2.1.8.1 Finite Element Analysis and Experimental Sprockets 43
2.1.8.2 Fully Decoupled Running Gear 44
2.1.8.3 Flexible Rubber Tracks 44
2.1.9 Reducing Noise and Vibration 44
2.1.9.1 Stage (a): Establishing the Principal Noise Sources 45
2.1.9.2 Stage (b): Design and Production of the Resilient Mountings 46
2.1.9.3 Stage (c): Test Results with the Resilient Mountings 47
2.2 Flexible Tracks 48
2.2.1 Earlier Flexible Tracks 49
2.2.2 Contemporary Flexible Tracks 50
2.2.3 'Proof?]of?]Principle' Flexible Tracks for a Spartan APC 51
2.2.3.1 Mark 1 Tracks 53
2.2.3.2 Mark 2 Tracks 54
2.2.3.3 Mark 3 Tracks 55
2.2.3.4 Durability Trials 57
2.2.4 Later Developments 57
References 58
3 Tracked Vehicle Suspension Performance: Modelling and Testing 59
3.1 Human Response to Whole?]Body Vibration (WBV) and Shock 59
3.1.1 BS 6841:1987 and ISO 2631?]1 (1997) 59
3.1.2 Further Standards Relating to WBV 61
3.1.2.1 Absorbed Power 61
3.1.2.2 The European Physical Agents (Vibration) Directive 2002/44/EC 64
3.1.2.3 ISO 2631?]5 (2004) 64
3.2 Terrain Profiles 64
3.2.1 Characterisation 64
3.2.2 DERA Suspension Performance Test Courses 65
3.2.3 Response of Multi?]Wheel Vehicles 66
3.2.4 Quarter?]Car Model 68
3.2.5 Computer Modelling 71
3.2.5.1 Parameter Specification 73
3.2.5.2 Assum…