MECHANISMS and MACHINE THEORY

This book develops the basic content for an introductory course in Mechanisms and Machine Theory. The text is clear and simple, supported by figures. Several solved practical oriented exercises problems have been included to enrich student’s knowledge on synthesis of mechanism based on the real time applications.

Kinematic Synthesis of Mechanism for System with a Technical Vision

A solution to the problem of synthesizing an initial three-dimensional kinematic chain with spherical and rotary kinematic pairs is presented. It is shown that this chain can be used as a structural module for structural-kinematic synthesis of three-dimensional four-link motion generating lever mechanisms by the preset positions of the in-and output links. This paper affects the actual today’s problem of optimal synthesis of spatial link mechanisms. In this regard, the task of developing methods for the synthesis of complex spatial link mechanisms with the desired laws of motion of the input and output elements allowing automatizing the implementation of all design phases with the use of computer is quite relevant. The authors develop machine-oriented method of structural and kinematic synthesis of spatial link mechanisms based on the use of spatial initial kinematic chains (IKC) realizing prescribed motions. A new approach to the design of spatial mechanisms is suggested, according to which the design process is based on the kinematic synthesis of four-link initial kinematic chain (IKC) and associable kinematic chains (AKC).

On a hybrid particle swarm optimization method and its application in mechanism design

In this article, we propose a hybrid particle swarm optimization method and obtain the optimal solutions of the synthesis of mechanism. We study the mathematics on the four-bar linkage and its objective function on the optimization process and conduct the numerical experiment for four cases of movement of mechanical linkage bars (coupler curves). The result of synthesis of mechanism is not only shown to be in better accuracy but also properly matches the designated mechanical coupler bar curve.

Package of Programs for the Synthesis of Space Gear Mechanism in the MAPLE Environment

The design of any mechanism begins with the design of its scheme. Subsequent calculations for strength, structural design of links and kinematic pairs, choice of materials, and other stages of the design, as a rule cannot significantly change the basic properties of the mechanism. The design of mechanisms scheme on the specified properties is called synthesis of mechanism. In this work we considered the software package of kinematic synthesis of spatial gear lever mechanisms for five, seven, eight and nine parameters.

Autogenerating/Drawing Valid Arrays and Contracted Graphs With Pentagonal Links for Type Synthesis of Mechanism by Computer Aided Design

A method for autogeneration/draw of valid arrays and contracted graphs by cad is studied in this paper. First, the concepts and relative new criteria of arrays and contracted graphs (CGs) are explained for the representation/generation of the CGs and the identification of the isomorphic/invalid CGs using the arrays. Second, a software is created in Visual Basic for automatically generating the arrays of the CGs with pentagonal links, identifying the isomorphic/invalid arrays, generating the valid arrays, and automatically drawing their CGs. Third, the interface of the software and the main functions of the compiled programs are explained. Finally, some examples are given to illustrate this software and method.

The Innovative Design of Airliner Front Landing Gear Mechanism

On the basis of the existing mechanism, we can induce the topological structure of the original mechanism. By using the number synthesis of mechanism, we can find the link assortment which can satisfy topological structure of the original mechanism. By using permutation, we can obtain the generalized kinematic chains. According to the special design constraints, after appointing each link and kinematic pair, we can gain all the suitable feasible specialized chains. Then making a converse reasoning based on the generalized principle, we will finally integrate the schematic diagram of mechanism suitable for our design purpose. Therefore, if we make a kinematic and a dynamic analysis on mechanism based on this, after structural designing, we can find a new mechanical device whose performance is up to or even superior to that of the original product.