Editorial Reviews. About the Author. The author is a Ph.D. in the Department of Mechanical Optimization for Engineering Design: Algorithms and Examples, 2nd ed - Kindle edition by Kalyanmoy Deb. Download it eBook features: Highlight. Optimization for Engineering Design: Algorithms and Examples, 2nd ed - Kindle edition by KALYANMOY DEB. Download it once and read it on your Kindle. Optimization for Engineering Design: Algorithms and Examples Kalyanmoy Deb Really an excellent book for studying various optimization methods.

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Optimization for Engineering Design: Algorithms and Examples. Front Cover. Kalyanmoy Deb. Prentice-Hall of India, - Algorithms - pages. 0 Reviews . OPTIMIZATION FOR ENGINEERING DESIGN: Algorithms and Examples. Front Cover. KALYANMOY DEB. PHI Learning Pvt. Ltd., Nov 18, - Business. Students in other branches of engineering offering optimization courses as well as designers and decision-makers will also find the By KALYANMOY DEB.

Figure 1. Thereafter, the designer needs to choose the important designvariables associatedwiththedesignproblem. Theformulation of optimal design problems involves other considerations, such as constraints, objective function, and variable bounds. As shown in thefigure, thereis usually a hierarchyin theoptimaldesign process; although one consideration may get influenced by the other. We discuss all these aspects in thefollowing subsections. A design problem -usually involves many design parameters, of which some are highly sensitive to the proper working of the design. These parameters are called design variables in the parlance of optimization procedures. Other not so important design parameters usually remain fixed or vary in relation to the design variables. There is no rigid guideline to choose a priori the parameters which may be important in a problem, because one parameter may be more important with respect to minimizing the overall cost of the design, while it may be insignificant with respect to maximizing the life of the product. Thus, the choice of the important parameters in an optimization problem largely depends on the user.

Author Deb, Kalyanmoy. Physical Description xiv, p. Subjects Engineering -- Mathematical models.

Mathematical optimization. Notes "Eastern economy edition"--Cover.

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Some of these considerations require that the design remain in static or dynamic equilibrium. In many mechanical and civil engineering problems, the constraints are formulated to satisfy stress and deflection limitations.

Often, a component needs to be designed in such a way that it can be placed inside a fixed housing, thereby restricting the size of the component. There is, however, no unique way to formulate a constraint in all problems.

The nature and number of constraints to be included in the formulation depend on the user. In many algorithms discussed in this book, it is not necessary to have an 5 Introduction explicit mathematical expression of a constraint; but an algorithm or a mechanism to calculate the constraint is mandatory.

For example, a mechanical engineering component design problem may involve a constraint to restrain the maximum stress developed anywhere in the component to the strength of the material. In an irregular-shaped component, there may not exist an exact mathematical expression for the maximum stress developed in the component. A finite element simulation software may be necessary to compute the maximum stress.

But the simulation procedure and the necessary input to the simulator and the output from the simulator must be understood at this step. There are usually two types of constraints that emerge from most considerations. Either the constraints are of an inequality type or of an equality type. Inequality constraints state that the functional relationships among design variables are either greater than, smaller than, or equal to, a resource value.

For example, the stress a x developed anywhere in a component must be smaller than or equal to the allowable strength Sallowable of the material. Mathematically, a x ::; Sallowable' Most of the constraints encountered in engineering design problems are of this type. Some constraints may be of greater-than-equal- to type: for example, the natural frequency v x of a system may required to be be greater than 2 Hz, or mathematically, v x 2. Fortunately, one type of inequality constraints can be transformed into the other type by multiplying both sides by -1 or by interchanging the left and right sides.

For example, the former constraint can be transformed into a greater-than-equal-to type by either -a x -Sallowable or Sallowable a x. Equality constraints state that the functional relationships should exactly match a resource value.

Equality constraints are usually more difficult to handle and, therefore, need to be avoided wherever possible. If the functional relationships of equality constraints are simpler, it may be possible to reduce the number of design variables by using the equality constraints.

In such a case, the equality constraints reduce the complexity of the problem, thereby making it easier for the optimization algorithms to solve the problem. In Chapter 4, we 6 Optimization for Engineering Design: Algorithms and Examples discuss a number of algorithms which are specially designed to handle equality constraints. Fortunately, in many engineering design optimization problems, it may be possible to relax an equality constraint by including two inequality constraints. Although this formulation is inexact as far as the original requirement is concerned, this flexibility allows a smoother operation of the optimization algorithms.

Thus, the second thumb rule in the formulation of optimization problems is that the number of complex equality constraints should be kept as low as possible.

The common engineering objectives involve minimization of overall cost of manufacturing, or minimization of overall weight of a component, or maximization of net profit earned, or maximization total life of a product, or others.

Although most of the above objectives can be quantified expressed in a mathematical form , there are some objectives that may not be quantified easily. For example, the aesthetic aspect of a design, ride characteristics of a car suspension design, and reliability of a design are important objectives that one may be interested in maximizing in a design, but the exact mathematical formulation may not be possible. In such a case, usually an approximating mathematical expression is used.

Moreover, in any real-world optimization problem, there could be more than one objective that the designer may want to optimize simultaneously. Even though a few multiobjective optimization algorithms exist in the literature Chankong and Haimes, , they are complex and computationally expensive.

Thus, in most optimal design problem, multiple objectives are avoided.