chp 1 - Introduction Definitions Geometrical Categorization...

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Unformatted text preview: Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law MAAE 3004: Dynamics of Machinery Chapter 1: Introduction Department of Mechanical and Aerospace Engineering Carleton University c F.F. Afagh and R.G. Langlois Sections in text: 1.11.9 Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law Outline Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law 1.1 Introduction 1.1.1 Objective: The theory of machines and mechanisms is an applied science which is used to understand the relationship between the geometry and motions of the parts of a machine or mechanism and the forces which produce these motions Uicker, Pennock, and Shigley; Theory of Machines and Mechanisms; 3 rd edition, Oxford, 2003. Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law 1.1.2 Mechanics: MECHANICS deals with forces, motion, and time The subject of this course is dynamics as it applies to mechanisms and machines Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law 1.2 Definitions a) Machine: a combination of resistant bodies so arranged that by their means the mechanical forces of nature can be compelled to do work accompanied by certain determinate motions . F. Reuleaux (1829-1905)-father of systematic treatment of kinematics. an arrangement of parts for doing work , a device for applying power or changing its direction. Shigley and Uicker; The theory of machines and mechanisms; 3 rd edition, Oxford, 2003. Key concepts: power (work,energy and force) bodies (physical parts) motion (kinematics) Conclusion: Machines are closely associated with Kinetics. Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law b) Mechanism: an assemblage of resistant bodies , connected by moveable joints to form a closed kinematic chain with one link fixed and having the purpose of transforming motion . F. Reuleaux The predominant idea in the mind of the designer is one of achieving a desired motion . Shigley and Uicker; The theory of machines and mechanisms; 3 rd edition, Oxford, 2003. Key concept: motion Conclusion: Mechanisms are closely associated with Kinematics All machines are mechanisms, but not all mechanisms are machines. Introduction Definitions Geometrical Categorization of Mechanisms Mobility Kinematic Inversion Grashofs Law c) Link: A rigid body connecting two or more elements of different kinematic pairs...
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chp 1 - Introduction Definitions Geometrical Categorization...

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