Presentation of Mechanical
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Mechanical engineering involves the study and use of machines to transform, transmit, or use energy, force, or motion. Mechanical engineers work across many industries designing and analyzing machines that range from simple tools to complex systems. They consider how machines move, are powered, transmit forces, generate heat, and interact with fluids and materials while fulfilling their designed functions. The study of mechanical engineering incorporates mathematics, physics, engineering fundamentals, design, and technical electives.
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Presentation of Mechanical
- 1. What is Mechanical Engineering? Mechanical Engineering is the profession related to the study and use of machines. A machine transforms, transmits, or uses energy, force or motion for a specific purpose
- 2. Machines • Machines range from mechanical pencils to automobiles to the human body •Machines are designed to fulfill some function (design) •Machines require power (thermodynamics, combustion) •Machines pollute (air pollution control) •Machines make heat that has to be removed (heat transfer and fluid mechanics)
- 3. Machines •Machines move, so their motion must be understood (kinematics, dynamics) and controlled (controls) •Motions are resisted by surrounding air or fluid (fluids) •Machines must be constructed (manufacturing) •Machines have to be made from something (materials)
- 4. Where Do Mechanical Engineers work? • Automotive industry • Power generation industry ($200 billion) • Manufacturing (computers to valves) • Aerospace and Defense • Robotics • Air pollution control • Oil industry • Consulting firms
- 5. What would you study? • Calculus and Differential Equations • Physics and Chemistry • Humanities and Social Science • Communication • Engineering Fundamentals (Statics, Fluid Mechanics, Dynamics, Thermodynamics, Heat Transfer, Circuits, Materials, Strengths, Kinematics, Controls, Vibrations) • Design • Technical Electives (Engineering Economics, Combustion, Robotics, Air Pollution Control, Mechatronics)
- 6. Characteristics of a Mechanical Engineer • Capable communicator • Willing to do hands-on work • Affinity for machines • Strong interest in math and science • Innovative problem solver
- 7. Automotive Engineering Design & Manufacturing
- 8. Automotive Engineering Engines and Power Transmission
- 9. Manual Transmission – Engaging First Gear
- 10. Manual Transmission Details Spur Gears Synchronizer
- 12. ME and Multidisciplinary Student Organizations • Ebobcat, Electric Bobcat Racing Team • SAE, Society of Automotive Engineers • ASME, American Society of Mechanical Engineers • Aeromobile, NASA Revolutionary Vehicle Design Competition Team • EWB-ohio, Engineers without Borders • Robocup Contact me for details on getting involved!
- 13. Dr. Greg Kremer, Faculty Team Leader
- 14. What is the Electric Bobcat Racing Team? A multidisciplinary team of engineering and technology students that construct a high- performance battery-powered electric race car • Mechanical Engineering • Electrical Engineering • Industrial Technology • Industrial & Manufacturing Systems Engineering • Others from University are welcome • ~ 30 active members
- 16. What does the Electric Bobcat Team Do? We start with an empty Formula Lightning © chassis
- 17. Here is a picture of our Formula Lightning © chassis near the beginning of the rebuild
- 18. Students (with limited assistance from advisors) • Design • Produce and/or purchase • Install an electromechanical drive train in the chassis
- 19. The Electric Vehicle is raced by a professional driver against 12 other teams in the UCEVRT, including Ohio State University University of Notre Dame West Virginia University Brigham Young University
- 20. Electric Vehicle Design Issues Battery Assembly Coupler Transmission Controller AC Motor
- 21. Torque & Power vs Speed (3K6) 0 20 40 60 80 100 120 140 160 180 1037 2048 3069 3980 5006 6018 7037 8054 8951 9923 11215 Motor Speed [RPM] Torque[ft-lbs],Power[hp] Torque @ 310VDC Power @ 310VDC Torque @ 350VDC Power @ 350VDC Motor Curve
- 22. Hewland LD 200 Transmission Quick-Flex Coupling
- 23. VEHICLE DYNAMICS Vehicle Acceleration Limitations - Engine power (torque/speed relationship) - Max gear ratio (torque multiplication by transmission) - Wheel traction limit Vehicle Speed Limitations - Engine power - Engine speed - Min gear ratio (speed effect of transmission) - Rolling resistance - Aerodynamic drag
- 24. 0 20 40 60 80 100 120 0 200 400 600 800 1000 1200 Tractive Force and Total Road Load as a function of time for multi-gear simulation Time [sec] LoadsandForces,[lbf] Tractive Force Road Loads
- 25. 0 20 40 60 80 100 120 0 20 40 60 80 100 120 Vehicle Speed vs. Time for a 4 gear simulation Time [sec] Velocity,[MPH] 0-60mph in ~8 seconds with a 4 Speed Transmission MAXIMUM ATTAINABLE SPEED = 114 mph No Transmission 4 Speed Transmission
- 26. 2nd Annual SAE Car Show
- 27. SAE Aero Design East 2003 Ohio University Team Bobcat Flyer Eric Bucher Jason Fink Nick Haynes Andy Hughes Scott Szymczak Caleb Woodby Jesse Shoup Joel Bokelman Eric Aber Jennifer Leake Faculty Advisor: Dr. Greg Kremer
- 28. Design specifications and goals • Fixed wing, payload aircraft • Minimum 300 in3 cargo bay, centering homogeneous payload about aircraft CG • Maximum wingspan of 72 inches • Maximum takeoff runway of 200 feet
- 29. 2003 Bobcat Flyer • Tailwheel biplane design
- 30. Biplane wing design • Gap • Span Ratio • Stagger • Wing Struts
- 31. Landing gear • 1/8” tempered aluminum Dural landing gear • 3/16” diameter, 2” length plated steel axle • Support arm and axle— two critical sections of the main gear designed to at least FOSDE = 1.5 • 4” diameter Lightweight pnuematic wheels
- 32. Landing gear design and analysis— Support arm • Fuselage mounting plate modified to reduce weight • Uniform stresses highlight design optimization • Worst-case loading yields FOSDE = 1.56 (Syield = 40ksi)
- 33. Aero Design East 2002 Team Bobcat Flyer 12 Ohio University Jason J. FinkJason J. Fink Andy HughesAndy Hughes Nick HaynesNick Haynes Anthony GlickAnthony Glick AnthonyAnthony GerstenbergerGerstenberger Rob Welch Faculty Rep: Dr. Greg Kremer Rob Welch
- 35. ASME Lecture Series AEP Gavin Plant Twin 1300MWN Turbine Generators With FGD, Low NOx Burners, SCRs, SO3 Mitigation
- 36. Addressing Professionalism in the OU ME Department, G. Kremer NASA/GAPO National Student Design Competition The Aeromobile, Ohio University’s entry in the Revolutionary Vehicle Systems Design Competition
- 37. ME Senior Design Project See our webpage (http://www.ent.ohiou.edu/~me470/ ) for examples of projects from the past several years
- 38. Other places to get info about Mechanical Engineering How Stuff Works – Automotive http://auto.howstuffworks.com/ ) Jet Engines (http://www.geae.com/education/engines101/ ) Airplanes – Boeing 777 (http://www.boeing.com/commercial/777family/flash.html ) International Space Station (http://www.nasa.gov/mission_pages/station/main/index.html )
- 39. Summary • Mechanical Engineering can be fun and exciting • We design vehicles that move fast and fly high, and machines that allow mankind to do things they couldn’t otherwise do • Get involved in student organizations – they are a great learning experience • See me if you have any questions about Mechanical Engineering (Dr. Kremer, 257 Stocker)