MIT2_007s09_lec06

MIT2_007s09_lec06 - MIT OpenCourseWare http:/ocw.mit.edu...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
MIT OpenCourseWare http://ocw.mit.edu 2.007 Design and Manufacturing I Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2.007 –Design and Manufacturing I Mechanisms: Kinematic Analysis and Synthesis Presented by Dan Frey on 24 FEB 2009 Image removed due to copyright restrictions. Please see http://www.automotive-illustrations.com/img/suspensions/accord-rear-sus.jpg Source: Fig. 4-31 in Suh, C. H. Computer Aided Design of Mechanisms Part A. Self-published book, 1989. Courtesy of Dr. C. H. Suh. Used with permission.
Background image of page 2
Today’s Agenda • Collect homework #1 • Distribute homework #2 • Begin mechanisms –Mobility / degrees of freedom –Some basic mechanisms –Kinematic analysis –Mechanism synthesis –Solving systems of equations
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2D Mechanisms • Where are they found? • What do they do?
Background image of page 4
2D Mechanisms • Where are they found? • What do they do? http://www.mossmotors.com/ Image removed due to copyright restrictions. Please see http://mossmotors.com/Graphics/Products/Schematics/SPM-032.gif
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2D Mechanisms • Where are they found? • What do they do? Image from Wikimedia Commons, http://commons.wikimedia.org
Background image of page 6
2D Mechanisms • Where are they found? • What do they do?
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Two Goals in our Study of Mechanisms • Analysis – Given a mechanism, predict its behavior – Degrees of freedom – Path of motion – Dynamics -- velocity, acceleration – Force transmission • Synthesis – Given a desired behavior, develop a mechanism
Background image of page 8
Degrees of Freedom • DOF = the number of independent parameters required to completely define the entity’s location and orientation • If a body is constrained to a plane, how many DOF does it possess? • If a pin joint is added? • If a sliding joint is added? • If it rolls without slipping?
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Types of “Joints” • How do these attachments affect the degrees of freedom? • What about welding / clamping? Source: Figure 4 in Suh, C. H. Computer Aided Design of Mechanisms Part B. Self-published book, 1992. Courtesy of Dr. C. H. Suh. Used with permission. Norton, R. L., Design of Machinery
Background image of page 10
Mobility Criteria in 2D • Kutzbach criterion (to find the DOF) • Grübler criterion (to have a single DOF) F =3( n -1)-2 j DOF # of bodies # of full pinned joints 2 j- 3 n +4=0
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Mobility Criteria in 2D • Count the rigid bodies • Every rigid body has 3 DOF • For the “joints”
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/23/2012 for the course MECHANICAL 2.007 taught by Professor Fry during the Spring '11 term at MIT.

Page1 / 38

MIT2_007s09_lec06 - MIT OpenCourseWare http:/ocw.mit.edu...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online