ME 312 Mechanical Machine Design - Lecture 01

transcript

05/02/2023Spring 312 ( Cpoyrights Bilal Siddiqui 2015

ME 312 – Machine DesignDr. Bilal A. Siddiqui,Asst. Prof (ME)

2 Course Outline

Basic criteria of design of machine parts Determination of permissible and actual stresses, factor of safety etc. Design of …..

3 Course Outline

Pre-requisites Mechanics of Materials-I (ME-212) Mechanics of Materials-II (ME-213)

Textbook Mechanical Engineering Design by J. E. Shigley, McGraw Hill

References Machine Design, An Integrated Approach by R. L. Norton, McGraw Hill. Design of Machine Elements by M. F. Spotts, Prentice Hall Fundamentals of Machine Component Design, by R. C. Juvinall & K. M.

Marshek, John Wiley

4 Course Outline

Evaluation Methods

Course Objectives Design common machine elements and to gain experience in solving design

problems. Prepare professional quality solutions and effectively communicate the results

of analysis and design.

Homeworks 6.5%Project 7.0%Quizzes 6.5%Major Exams 30.0%Final Exam 50.0%

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5 What is a (Mechanical) Machine

A machine is a tool containing one or more moving parts that uses energy to perform the action it is designed for. Tool: …well, open to interpretation. Anything that makes life easy Moving parts: simple machines? Energy: chemical, electrical, mechanical, thermal etc. Action: transport, manufacturing, destroying etc. Design: ME-312

Spring 312 ( Cpoyrights Bilal Siddiqui 2015

Newtonian Mechanics

6 Simple Machines

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7 Design Example (simple lever)

Mechanical Advantage = Constraints

Strength of material Strength of Fulcrum joint Bearing strength Effort force available Maximum and minimum arm lengths (Le>Lr) Cost

Spring 312 ( Copyrights' Bilal Siddiqui 2015Le

Design Space

8 Compound Machines

9 Complex Machines

10 Really Complex Machines

11 Nature & Engineering Design

T=0T= 1503

ADT= 1903

ADT= 2003

12 So what is the best Design

13 The Design Cycle

Identify need Survey existing solutions

Define Problem (constraints,

requirements…)

Select Possible Solutions

Evaluate Solutions

(simulations)Select ‘Best’

Solution

Develop and Prototype Solution

Testing and further

improvement

Presentation and

Communicate

optimization

14 Design Stages

Initial Design Preliminary Design Detailed Design

15 Course Project…..

1. Define need

DESPERATE: We need to replace these guys with these…

17 Course Project…..

1. Survey Existing Solutions

18 2. Offshoot Ideas

19 3. Generate Ideas (Brainstorm)

Come up with several concepts New …or hybrid

20 Define the Problem

Which disabilities? What sizes? Constraints? Regulations? Business model? Which parts are required? Who are the competitors? Our advantage?

ME 312 Mechanical Machine Design - Lecture 01

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