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2008 | Buch

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Vehicle Dynamics: Theory and Application

verfasst von: Reza N. Jazar

Verlag: Springer US

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

This text is for engineering students. It introduces the fundamental kno- edge used in vehicle dynamics. This knowledge can be utilized to develop computer programs for analyzing the ride, handling, and optimization of road vehicles. Vehicle dynamics has been in the engineering curriculum for more than a hundred years. Books on the subject are available, but most of them are written for specialists and are not suitable for a classroom application. A new student, engineer, or researcher would not know where and how to start learning vehicle dynamics. So, there is a need for a textbook for beginners. This textbook presents the fundamentals with a perspective on future trends. The study of classical vehicle dynamics has its roots in the work of great scientists of the past four centuries and creative engineers in the past century who established the methodology of dynamic systems. The development of vehicle dynamics has moved toward modeling, analysis, and optimization of multi-body dynamics supported by some compliant members. Therefore, merging dynamics with optimization theory was an expected development. The fast-growing capability of accurate positioning, sensing, and calculations, along with intelligent computer programming are the other important developments in vehicle dynamics. So, a textbook help the reader to make a computer model of vehicles, which this book does.

Inhaltsverzeichnis

Frontmatter

Tire and Rim Fundamentals

Frontmatter

1. Tire and Rim Fundamentals

We introduce and review some topics about tires, wheels, roads, vehicles, and their interactions. These subjects are needed to understand vehicle dynamics better.

Reza N. Jazar

One-Dimensional Vehicle Dynamics

Frontmatter

2. Forward Vehicle Dynamics

Straight motion of an ideal rigid vehicle is the subject of this chapter. We ignore air friction and examine the load variation under the tires to determine the vehicle’s limits of acceleration, road grade, and kinematic capabilities.

Reza N. Jazar

3. Tire Dynamics

The tire is the main component interacting with the road. The performance of a vehicle is mainly influenced by the characteristics of its tires. Tires affect a vehicle’s handling, traction, ride comfort, and fuel consumption. To understand its importance, it is enough to remember that a vehicle can maneuver only by longitudinal, vertical, and lateral force systems generated under the tires.

Reza N. Jazar

4. Driveline Dynamics

The maximum achievable acceleration of a vehicle is limited by two factors: maximum torque at driving wheels, and maximum traction force at tireprints. The first one depends on engine and transmission performance, and the second one depends on tire-road friction. In this chapter, we examine engine and transmission performance.

Reza N. Jazar

Vehicle Kinematics

Frontmatter

5. Applied Kinematics

Position, velocity, and acceleration are called kinematics information. Rotational position analysis is the key to calculate kinematics of relatively moving rigid bodies. In this chapter, we review kinematics and show applied methods to calculate the relative kinematic information of rigid bodies. A vehicle has many moving sub-systems such as suspensions, and the vehicle can be treated as a moving rigid body in an inertia coordinate frame.

Reza N. Jazar

6. Applied Mechanisms

Most of the mechanisms used in vehicle subsystems are made of four-bar linkages. Double A-arm for independent suspension, and trapezoidal steering are two examples of mechanisms in vehicle subsystems. In this chapter, we review the analysis and design methods for such mechanisms.

Reza N. Jazar

7. Steering Dynamics

To maneuver a vehicle we need a steering mechanism to turn wheels. Steering dynamics which we review in this chapter, introduces new requirements and challenges.

Reza N. Jazar

8. Suspension Mechanisms

The suspension is what links the wheels to the vehicle body and allows relative motion. This chapter covers the suspension mechanisms, and discusses the possible relative motions between the wheel and the vehicle body. The wheels, through the suspension linkage, must propel, steer, and stop the vehicle, and support the associated forces.

Reza N. Jazar

Vehicle Dynamics

Frontmatter

9. Applied Dynamics

Dynamics of a rigid vehicle may be considered as the motion of a rigid body with respect to a fixed global coordinate frame. The principles of Newton and Euler equations of motion that describe the translational and rotational motion of the rigid body are reviewed in this chapter.

Reza N. Jazar

10. Vehicle Planar Dynamics

In this chapter we develop a dynamic model for a rigid vehicle in a planar motion.When the forward, lateral and yaw velocities are important and are enough to examine the behavior of a vehicle, the planar model is applicable.

Reza N. Jazar

11. Vehicle Roll Dynamics

In this chapter, we develop a dynamic model for a rigid vehicle having forward, lateral, yaw, and roll velocities. Themodel of a rollable rigid vehicle is more exact and more effective compared to the rigid vehicle planar model. Using this model, we are able to analyze the roll behavior of a vehicle as well as its maneuvering.

Reza N. Jazar

Vehicle Vibration

Frontmatter

12. Applied Vibrations

Vibration is an avoidable phenomena in vehicle dynamics. In this chapter, we review the principles of vibrations, analysis methods, and their applications, along with the frequency and time responses of systems. Special attention is devoted to frequency response analysis, because most of the optimization methods for vehicle suspensions and vehicle vibrating components are based on frequency responses.

Reza N. Jazar

13. Vehicle Vibrations

Vehicles are multiple-DOF systems as the one that is shown in Figure 13.1. The vibration behavior of a vehicle, which is called ride or ride comfort, is highly dependent on the natural frequencies and mode shapes of the vehicle. In this chapter, we review and examine the applied methods of determining the equations of motion, natural frequencies, and mode shapes of different models of vehicles.

Reza N. Jazar

14. Suspension Optimization

In this chapter, we examine a linear, one degree-of-freedom, base excited vibration isolator system as the simplest model for a vibration isolator and vehicle suspension. Based on a root mean square (RMS) optimization method, we develop a design chart to determine the optimal damper and spring for the best vibration isolation and ride comfort.

Reza N. Jazar

15. Quarter Car

The most employed and useful model of a vehicle suspension system is a quarter car model, shown in Figure 15.1. We introduce, examine, and optimize the quarter car model in this chapter.

Reza N. Jazar

Backmatter

Titel: Vehicle Dynamics: Theory and Application
verfasst von: Reza N. Jazar
Verlag: Springer US
Electronic ISBN: 978-0-387-74244-1
Print ISBN: 978-0-387-74243-4
DOI: https://doi.org/10.1007/978-0-387-74244-1

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