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About this book

Hydropneumatic suspension systems combine the excellent properties of gas springs with the favourable damping properties of hydraulic fluids. The advantages of these systems are particularly appropriate for mobile applications, such as agricultural and construction equipment as well as passenger cars, trucks and busses. Based on his 20 years of experience with this technology, Dr. Bauer provides in this book an extensive overview of hydropneumatic suspension systems. Starting with a comparison of different types of suspension systems, the author subsequently describes the theoretical background associated with spring and damping characteristics of hydropneumatic systems. Furthermore, he explains the design of the most important system components and gives an overview of level control systems, various special functions, patents and design examples. Finally, an outlook for future hydropneumatic suspension systems is discussed. Compared to the first edition, this new edition puts an additional focus on damping functions as well as applications / projects and contains various additional details such as proportional valves, all-wheel suspension or dediated power supply. Furthermore, suspension testing has been added as a new chapter.

Table of Contents

Frontmatter

Chapter 1. Suspension Systems Basics

Abstract
As already mentioned in the preface, suspension systems have a broad range of applications in our daily lives. Usually people do not even know that they exist, yet they are doing a hard job in many cases.
Wolfgang Bauer

Chapter 2. Spring and Damping Characteristics of Hydropneumatic Suspension Systems

Abstract
The simplest hydropneumatic suspension system consists of only three components: a hydraulic cylinder, a hydropneumatic accumulator, which is directly mounted on the cylinder and, of course, the hydraulic fluid.
Wolfgang Bauer

Chapter 3. Dimensioning of the Hydropneumatic Suspension Hardware

Abstract
At the beginning of this chapter it is important to mention that there will be no deduction of the optimum properties of the suspension system, what spring rate and which damping should be set for best performance—these topics are covered extensively in the literature for conventional suspension systems (for example [REI89], [REI05], [CAU01], [KOC]).
Wolfgang Bauer

Chapter 4. Hydraulic Components Design

Abstract
The schematic setup of a simple hydropneumatic suspension system has been illustrated already in Sect. 2.1. The following section describes the design of the basic components for the suspension unit: cylinder, accumulator, flow resistors and lines/fittings.
Wolfgang Bauer

Chapter 5. Level Control

Abstract
One of the major advantages of hydropneumatic suspension systems is the capability to readjust the suspension position after a change of the suspended load, simply by adding or removing hydraulic fluid.
Wolfgang Bauer

Chapter 6. Special Functions of Hydropneumatic Suspension Systems

Abstract
Undoubtedly a suspension system provides many benefits. In most applications the most important benefit is the reduction of accelerations on the isolated side, where, in case of a vehicle suspension system, the driver is usually located.
Wolfgang Bauer

Chapter 7. Suspension Testing

Abstract
For the design and development of hydropneumatic suspension systems, testing is essential throughout the whole development process.
Wolfgang Bauer

Chapter 8. Design Examples

Abstract
In this section the content of the previous sections will be explained in more detail using two actual design examples. Both are located in the wide area of vehicle chassis suspensions since most hydropneumatic suspension systems can be found in these applications.
Wolfgang Bauer

Chapter 9. Important Patents

Abstract
A wide variety of patent applications has been submitted in the technical area of hydropneumatic suspension systems, in the years between the first and second edition of this book increasingly also from Asia/China.
Wolfgang Bauer

Chapter 10. Looking into the Future

Abstract
After many decades of development, the hydropneumatic suspension today can be called a mature technology, which is proven by its successful application in many different areas. However the technical possibilities are far from being exhausted, many improvements are still possible and imaginable. Improvements on the component level as well as on the system level which provide—and this is extremely important—not only functional advancement but also a reasonable cost–benefit-ratio, making them favorable also from an economic point of view.
Wolfgang Bauer

Backmatter

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