MAE156A: Fundamental Principles of Mechanical Design I

Instructors:Dr. Nathan DelsonDr. Mostafa (Matthew) Hedayat

Lecture Overview

Motivation for Interdisciplinary DesignRobot ProjectCourse LogisticsElectronics Refresher

Mechanical Design is Dominated by Two Factors

The rapid pace of technology development in ALL areas

Electronics Sensors Motors Mechanical Components

Intense worldwide competition in most fields

You will continually need to learn new technology and optimize performance

Interdisciplinary Design has Risen to the Forefront of Technological

Breakthroughs

Effective design of a single product often requires close integration of a wide range of disciplines

Mechanical, Optical, Fluids, Materials Electronics: Microprocessor and Sensors Control, Software

Examples: Ink jet printing Motion based gaming (accelerometers and soon magnetics) Gene sequencing

Interdisciplinary Design is: A required element of an Accredited ME degree A stated priority of UCSD’s Chancellor

Mechatronics

A Mechatronic Device has close integration of Mechanical and Electronics

High performance requires consideration of both mechanical design, electronics, and control.

http://video_demos.colostate.edu/mechatronics/inkjet_printer_components.wmv

Objectives & Methods of MAE156A&B

Provide a real world design experience in a supportive environmentLearning from the iterative nature of the design process through two design projects 7 week robotic/mechatronics design project 14 week sponsored design project

Self Guided Learning to develop life-long learning skills

The Old Method for Teaching Machine Design has Limitations

There is not enough time to cover all basic machine elements: Technology is changing too quickly

Even with “traditional” components such as gears We will cover select areas in depth

Knowledge of electronic control has become essential for many mechanical engineers.

156A Robot Project for Fall 2008Optimization of a Safe Cracking

Robot

 

Picture here

Robot Project Constraints

All teams have the same motors and need to rotate the same inertia.Performance is based upon the fastest time that completes the tasks within the 5 degrees accuracy requirement.For weeks 1-4 optimization is restricted to kit parts.For weeks 5-6 additional components can be purchased from outside vendors ($30 limit).

Robot Project Milestone

Week 1: Microprocessor Workshop (during section)Week 2: Structure and Sensor electronicsWeek 3: Non-optimized Motion ControlWeek 4: Power train ratio optimizationWeek 5: Component OptimizationWeek 6: Robot Contest – Complete OptimizationWeek 7: Oral Presentations

Emphasis on Analysis and Optimization

In the real-world trial and error is expensiveGood engineering decisions require both:

Solid theoretical analysis Good use of experimental results

All robots will achieve the contest task by week 3 Optimization will be the key for final robot performance

Individual reports will require justification of design decisions and demonstration of how these increased robot performance.

Emphasis on Proper use of Mechanical and Electronic

Components

Most engineering projects involve integration of existing components

Rapid technology development is occurring at the component level.

Use of manufactures’ specifications is critical for building reliable devices.

Learning how to use Spec. Sheets

Component selection will be critical in sponsored projects.

Machine Shop Course The machine shop course provides critical skills for fabrication, and developing Design For Manufacturability (DFM) skills. Shop skills will be used for 156B prototype fabrication

Instructional Team

Engineering StaffChris CassidyTom ChalfantDavid LischerSteve Roberts

InstructorsNathan DelsonMatthew Hedayat

Teaching AssistantsJosh MillerMichael Sankur

LogisticsWeb site: www.maelabs.ucsd.edu/mae156Microprocessor workshop in Design Studio during week 1 Machine shop class in EBU2-B30 starting week 2Teams makeup

5 students per team based upon section signup Student preference for Industry project Peer review factor (anonymous feedback)

Multiplying factor on team grade

Lab assignments due on day of section Starting week 1 (9/29-10/3)

Analytical assignments due Friday at 3pm in EBU2-311 bin Starting week 1 on 10/3

Missing Section: Jewish High Holydays or Otherwise

You must attend another lab section the same week Lectures will be podcast and made available for those with legitimate reasons. You are responsible for preemptively communicating with your teammates.

Section Logistics

Both Sections A00 and B00 will meet together for lectures which will alternate between Dr. Delson and Dr. Hedayat. Robot Project teams will be assigned by instructors, and will be based upon machine shop scheduleSponsored project teams will be based highly on student preferenceHalf the teams will present to and be graded by Dr. Delson, and the other half by Dr. Hedayat. The website schedule will indicate if we meet in the large lecture room, Design Studio, or smaller lecture rooms for student presentations.

MAE 156A Components

First 7 Weeks Microprocessor Robot

Project 65% of grade

Machine Shop Course Weeks 2-7 10% of grade

Last 3 Weeks Begin real-world,

sponsored design projects, to be completed in 156B

Individual Mechanical Components research and risk reduction

25% of grade

New This Year

New microprocessors and programming environment UCSD Instructional Improvement Grant

More emphasis on analysis and optimization There will be more creativity in the

MAE156B sponsored projects

Nate Delson:Why I Became Interested in Design

• Real-world engineering involves much more than Engineering Science

• Great designs come about with integration of Design Skills with Engineering Science

• This is especially true of electromechanical products

• My portfolio