Design to replace electric motors with mechanical springs ...
Machine Design Experiments Using Mechanical Springs … Design... · 2014. 6. 20. ·...
Transcript of Machine Design Experiments Using Mechanical Springs … Design... · 2014. 6. 20. ·...
Peter Malak
Mark Nagurka
Dept. of Mechanical Engineering
Marquette University
Milwaukee, Wisconsin, USA
June 17, 2014
Machine Design Experiments
using Mechanical Springs to
Foster Discovery Learning
Machine Design Experiments
using Mechanical Springs to
Foster Discovery Learning
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Marquette UniversityMarquette University
Malak & Nagurka, Marquette University (ASEE 2014)
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Marquette UniversityMarquette University
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Student-Centered LearningStudent-Centered Learning
• Advantages
� Short-term mastery
� Long-term retention
�Depth of understanding
�Critical thinking
�Creative problem-solving skills
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Student-Centered LearningStudent-Centered Learning
• Methods
�Active-Learning
�Cooperative Learning
�Collaborative Learning
� Inductive Learning
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Engineering Hall, MarquetteEngineering Hall, Marquette
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Machine Design LaboratoryMachine Design Laboratory
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Core Competency Skills Core Competency Skills � Identify machine components
� Know proper nomenclature
�Measure parameters (force, speed, …)
� Select components from catalogs
� Distinguish normal and used components
� Recognize proper and abnormal behavior
� Reverse engineer systems
� Develop engineering intuition
� Justify design choices
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Machine Design LabsMachine Design Labs
• Emphasis: hands-on experiences,
discovery learning, component selection,
design challenges
• Two hour lab sessions, max of 12 students
• Teams of two to three students
• Multiple stations
• In-lab and post-lab deliverables
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ExperimentsExperiments
• Lab 1: Introduction to Machine Systems & Elements
• Lab 2: Stress Measurements and Concentrations
• Lab 3: Press and Shrink Fits
• Lab 4: Flexible Components
• Lab 5: Design of Systems with Flexible Components
• Lab 6: Gears & Design of Gear Systems
• Lab 7: Bearings
• Lab 8: Springs
• Lab 9: Bolts and Fasteners
• Lab 10: Bicycles
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Lab 8: SpringsLab 8: Springs
• Lab 1: Introduction to Machine Systems & Elements
• Lab 2: Stress Measurements and Concentrations
• Lab 3: Press and Shrink Fits
• Lab 4: Flexible Components
• Lab 5: Design of Systems with Flexible Components
• Lab 6: Gears & Design of Gear Systems
• Lab 7: Bearings
• Lab 8: Springs
• Lab 9: Bolts and Fasteners
• Lab 10: Bicycles
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Overview of Spring ExperimentsOverview of Spring Experiments
• Identify spring types (tension, compression, torsion)
and appropriate applications
(automotive latches, key fobs, pens).
• Disassemble and re-assemble padlocks.
• Measure stiffness and achieve desired stiffness
with series and parallel combinations of springs
• Experimentally determine shear moduli and
stiffnesses of wire and 3D printed springs.
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Assorted SpringsAssorted Springs
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Different Types of SpringsDifferent Types of Springs
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PadlocksPadlocks
American
Lock
Strattec
Lock
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Padlock ComponentsPadlock Components
American
Lock
Strattec
Lock
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STRATTEC Padlock CylinderSTRATTEC Padlock Cylinder
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Padlocks DisassembedPadlocks Disassembed
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American Lock Pins & SpringsAmerican Lock Pins & Springs
Pins & Springs Cylinder
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Key Fob for Chevy CruzeKey Fob for Chevy Cruze
Chevy Cruze
Key Fob
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Key Fob DisassembledKey Fob Disassembled
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Key Fob SpringKey Fob Spring
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Key Fob SpringKey Fob Spring
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Key Fob Circuit BoardKey Fob Circuit Board
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Cadillac CTS Rear SeatsCadillac CTS Rear Seats
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Cadillac CTSCadillac CTS
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Seatback Latch MechanismSeatback Latch Mechanism
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Fixture for Seatback LatchFixture for Seatback Latch
Pivot
Latch
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Locked Seatback LatchLocked Seatback Latch
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Operation of Seatback LatchOperation of Seatback Latch
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Seatback LatchSeatback Latch
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Measuring Spring StiffnessMeasuring Spring Stiffness
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Overextended SpringOverextended Spring
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Spring VariabilitySpring Variability
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Test-Rig for Measuring StiffnessTest-Rig for Measuring Stiffness
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Stiffness of Parallel SpringsStiffness of Parallel Springs
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Spring KitSpring Kit
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3D Printed Springs3D Printed Springs
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3D Printed Springs3D Printed Springs
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Properties of 3D Printed SpringsProperties of 3D Printed Springs
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Stiffness of 3D Printed SpringsStiffness of 3D Printed Springs
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ClosingClosing• Experiments using mechanical springs were
developed to foster student-centered
learning in a Machine Design course.
• The experiments were introduced this Spring.
• Educational benefits:
(1) hands-on learning with real hardware,
(2) machine design challenges that promote
active-learning, and
(3) experience working in teams.
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Future OpportunitiesFuture Opportunities
• The use of 3D printed springs raises many
unanswered questions.
•Variability in material properties
• Spring life
• The topic of springs can be generalized to
compliant component design.Prof. Mark Nagurka
+1-414-288-3513
Thanks to STRATTEC Security Corp.,
Masterlock,
and
Marquette University
College of Engineering
Thanks to STRATTEC Security Corp.,
Masterlock,
and
Marquette University
College of Engineering