Synthesis of Mechanisms
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The document discusses the kinematics of machines, focusing on the synthesis of mechanisms, which includes function generation, type synthesis, number synthesis, and dimensional synthesis. Key aspects include the analysis versus synthesis of mechanisms, the selection of mechanism types, and the determination of degrees of freedom and necessary links. It highlights various methods and criteria relevant to mechanism design.
Synthesis of Mechanisms
- 1. GANDHINAGAR INSTITUTE OF TECHONOLOGY(012) SUBJECT : Kinematics of Mechines (2131906) Active Learning Assignment on the topic of “Synthesis of Mechanisms” BE Mechanical Prepared By: Yash Pandya Guided By : Prof.
- 2. OVERVIEW Introduction Synthesis of Function Generation Type Synthesis Number Synthesis Dimensional Synthesis
- 3. Introduction The science of mechanism kinematics is roughly divided in two divergent topics: i. Analysis ii. Synthesis Analysis:- It is study of motions and forces concerning different parts of an existing mechanism. Synthesis:- It is study of the design of its different parts.
- 4. Synthesis of Function Generation Function Generation Synthesis Graphical Synthesis Analytical Synthesis Invention Method Relative pole Method Four bar mechanism Slider crank mechanism
- 5. Type Synthesis Type Synthesis refers to the kind of mechanism selected, it might be a linkage, a geared system, belts and pulleys, or even a cam system. This beginning phase of total design problem usually involves design factors such as manufacturing process, materials, safety space and economics. The study of Kinematics is usually only slightly involved in type synthesis.
- 6. Type Synthesis The six categories are: i. Eye-bar type link (the lower pairs). ii. Wheels, including gears. iii. Cams in their many forms. iv. The screw (which transmits force and motion). v. Intermittent-motion devices (rachets). vi. Tension-compression parts with one-way rigidity such as belts, chains, and hydraulic or pneumatic lines.
- 7. Number Synthesis Number synthesis is the second step in the process of mechanism design. It deals with determining the number of DOF and the number of links and joints required. See Figure(next slide) If each DOF of the linkage is to be controlled in a closed kinematic chain, then an equal number of active inputs is required. Degree of freedom: Kutzback Criterion :- F=3(l-1)-2J-H Gruebler’s Criterion:- F=3(l-1)-2J Where J= number of joints H= number of surfaces
- 9. Dimensional Synthesis The third step in design, determining the dimensions of individual link is called dimensional synthesis.
- 10. Thank You