MIT2_72s09_lec02

MIT2_72s09_lec02 - MIT OpenCourseWare http:/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 2.72 Elements of Mechanical Design Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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2.72 Elements of Mechanical Design Lecture 02: Review
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Intent High-level review of undergrad material as applied to engineering decision making NOT an ME “redo” or a “how to” recitation
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Import Main goal of 2.72 is to teach you how to integrate past knowledge to engineer a system Given this, how do I engineer a mechanical system? modular simple complex system 2.001, 2.002 2.003, 2.004 2.005, 2.006 2.007, 2.008
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Use of core ME principles that you know… 2.001, 2.002 2.003, 2.004 2.007, 2.008 2.005, 2.006 © Martin Culpepper, All rights reserved 4
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Impact Understand why & how we will use parts of ME core knowledge Problem set Engineering
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Future help We can’t use lecture time to redo the early curriculum BUT We are HAPPY to help outside of lecture IF you’ve tried
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Schedule and reading assignment Reading quiz Changing from sponge to active mode Lecture Hands-on Mechanics Mechanics Dynamics Dynamics Heat transfer Heat transfer Matrix math Matrix math Reading assignment ± Shigley/Mischke Sections 4.1–4.5: 08ish pages & Sections 5.1–5.5: 11ish pages Pay special attention to examples 4.1, 4.4, 5.3 , and 5.4 © Martin Culpepper, All rights reserved 7
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Mechanics
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Free body diagrams Useful for: v v Σ F = 0 = ma ± Equilibrium ± Stress, deflection, vibration, etc… Σ M = 0 = I α v Why do we ALWAYS use free body diagrams? ± Communication ± Thought process ± Documentation How will we use free body diagrams? ± We are dealing with complex systems ± We will break problem into modules ± We will model, simulate and analyze mechanical behavior ± Integrate individual contributions to ascertain system behavior © Martin Culpepper, All rights reserved 9
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Free body diagrams: Bearings/rails © Martin Culpepper, All rights reserved 11
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Free body diagrams: Bearings/rails © Martin Culpepper, All rights reserved 12
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Static: Head stock deformation © Martin Culpepper, All rights reserved 13
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© Martin Culpepper, All rights reserved 14
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This note was uploaded on 02/24/2012 for the course MECHANICAL 2.72 taught by Professor Martinculpepper during the Spring '09 term at MIT.

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MIT2_72s09_lec02 - MIT OpenCourseWare http:/ocw.mit.edu...

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