Skip to main content
main-content

Über dieses Buch

This book presents simple design paradigms related to lightweight design, that are derived from an in-depth and theoretically sound analysis based on Pareto theory. It uses numerous examples, including torsion and inflated tubes, to fully explain the theories discussed.

Lightweight Construction Principles begins by defining terms in relation to engineering design and optimal design of complex mechanical systems. It then discusses the analytical derivation of the Pareto-optimal set, before applying analytical formulae to optimal design of bent beams. The book moves through numerous case studies of different beam and tube construction including beams subject to bending, thin walled tubes under torsion and truss structures.

This book will be of interest to researchers and graduate students in the field of structural optimisation and multi-objective optimization, as well as to practitioners such as design engineers.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Engineering Design and Optimal Design of Complex Mechanical Systems: Definitions

Abstract
The following chapter provides the lexicon used throughout the whole book. In the field of optimisation, a number of expressions (locutions) are used that refer to parameters, minimisation, maximisation, etc. The precise meaning of such expressions (locutions) has been derived from [143] and adapted to this book.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 2. Introduction to the Optimal Design of Complex Mechanical Systems

Abstract
The following chapter introduces, with an example, the major topics of the optimal design of complex mechanical systems. An application to structural design is dealt with. The example has been derived from [143] and adapted to this book.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 3. Analytical Derivation of the Pareto-Optimal Set with Application to Structural Design

Abstract
Often at the earliest stage of an engineering project, a preliminary optimisation is useful, in order to allow the designer to ascertain the envisaged performance of the system under development.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 4. Bending of Beams of Arbitrary Cross Sections—Optimal Design by Analytical Formulae

Abstract
At the very early stage of the design of a structure, the designer has to make a number of choices that will affect the whole project and that could be extremely costly and time-consuming to be modified in a later design stage. Many possible design solutions are initially available. A preliminary optimisation can be useful to the designer to get insight into the problem, to estimate the attainable performances.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 5. Bending of Lightweight Circular Tubes—Optimal Design

Abstract
The aim of this chapter is that of providing a sound theoretical guideline for a rigorous, and maybe ultimate, concept design of thin-walled circular tubes subject to bending. Such tubes can be of any dimension and made from any material.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 6. Optimal Design of a Beam Subject to Bending: A Basic Application

Abstract
In the framework of lightweight design, thin-walled structures have a primary role thanks to the high ratio between load carrying capabilities and mass. In order to maximise structural efficiency, i.e. minimise the mass of a general structure and maximise its stiffness at the same time, a rigorous optimisation approach is required.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 7. Bending of Lightweight Inflated Circular Tubes—Optimal Design

Abstract
Inflated tubes, and in general air inflated structures, have unique properties and advantages that can be exploited by designers. Such structures, with their very high load carrying to mass ratio, are well suited for lightweight design. Also, they present interesting properties. In fact, they can be rapidly and autonomously deployed, can be quickly moved and easily transported and, in case, can be rigidified [42, 134, 242]. These structures are utilised in many engineering applications such as aerospace, naval engineering and structural engineering, both for military and civil applications [42].
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 8. Torsion of Lightweight Circular Tubes—Optimal Design

Abstract
Thin-walled structures have a high ratio between load carrying capabilities and mass and play a primary role in lightweight design. In order to improve the structural efficiency, i.e. stiffness and mass ratio, a rigorous optimisation approach is required.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 9. Stochastic Optimisation Applied to Multi-axial Bending of Lightweight Beams

Abstract
The following chapter, adapted from [129], deals with the stochastic optimisation of complex mechanical systems like a beam subject to bending and torsion [88, 177, 178]. The adopted (and proper) theoretical basis for such an optimisation is multi-objective programming [152]. Multi-objective programming allows the designer to find a preferred solution by means of a proper selection among the set of optimal solutions called “Pareto-optimal set”. The designer, by means of the addressed selection, defines a set of parameters (design variable set) which defines the system under consideration. The choice (selection) is made after the optimal combination of the system performances has been identified by the designer.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 10. Multi-objective Optimisation of Truss Structures

Abstract
The following chapter is derived from [128] and adapted to this book.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 11. Topology Optimisation of Continuum Structures

Abstract
The choice of the appropriate structural topology in the conceptual phase is generally the most critical and decisive factor for obtaining an efficient new product. Furthermore for industrial applications, it is always desirable to minimise the total design process duration which is generally proportional to its cost. In this framework Topology optimisation approach (often referred to as layout optimisation or generalised shape optimisation [26, 112, 158, 193] in the literature) provides a very powerful tool for the design.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 12. Concurrent Topological Optimisation of Two Bodies Sharing Design Space

Abstract
The topological optimisation of engineering components is a well-discussed topic. In the literature many papers and books can be found defining the basis of topological optimisation and presenting states of the art and perspectives (see, for instance, [28, 74, 96, 190, 255, 260]). Many methods have been developed to face topology optimisation problems, among them, the most used, especially in available software, is the SIMP method [190].
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Chapter 13. Structural Optimisation in Road Vehicle Components Design

Abstract
Mass minimization is and has always been a central task in vehicle design. Lightweight design is nowadays assuming an even greater importance in road vehicles development. Many automotive companies and vehicle components manufacturers are performing several research activities on new composite materials and high strength aluminium alloys for reducing the overall mass of the vehicles. The weight reduction is a central issue in the design of new road vehicles, not only for improving vehicle performances, but also for the reduction of fuel consumption and emissions, as the new, tighter European standards (Euro VI) on environmental impact require.
Federico Maria Ballo, Massimiliano Gobbi, Giampiero Mastinu, Giorgio Previati

Backmatter

Weitere Informationen

Premium Partner

    Marktübersichten

    Die im Laufe eines Jahres in der „adhäsion“ veröffentlichten Marktübersichten helfen Anwendern verschiedenster Branchen, sich einen gezielten Überblick über Lieferantenangebote zu verschaffen. 

    Bildnachweise