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Journal Articles

Designing Multi-axis Compliant Mechanisms With Lockable Decoupled Inputs: A Tip–Tilt Case Study

Greta Vazzoler, Sam Shimohara, Giovanni Berselli, Jonathan B. Hopkins
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Technical Briefs
J. Mechanisms Robotics. April 2025, 17(4): 044507.
Paper No: JMR-24-1463
https://doi.org/10.1115/1.4066982
Published Online: November 6, 2024
View Article titled, Designing Multi-axis Compliant Mechanisms With Lockable Decoupled Inputs: A Tip–Tilt Case Study
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Topics: Rotation, Stiffness, Switches, Compliant mechanisms, Design, Bistability
Journal Articles

Large-Range Rotation-to-Translation Compliant Transmission Mechanism

Nigel C. Archer, Jonathan B. Hopkins
Journal: Journal of Mechanical Design
Publisher: ASME
Article Type: Design Innovation Paper
J. Mech. Des. December 2023, 145(12): 125001.
Paper No: MD-23-1340
https://doi.org/10.1115/1.4063160
Published Online: August 29, 2023
View Article titled, Large-Range Rotation-to-Translation Compliant Transmission Mechanism
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Topics: Design, Rotation, Screws, Topology, Displacement, Blades, Stiffness
Journal Articles

Comparing Mechanical Neural-Network Learning Algorithms

Ryan H. Lee, Pietro Sainaghi, Jonathan B. Hopkins
Journal: Journal of Mechanical Design
Publisher: ASME
Article Type: Research Papers
J. Mech. Des. July 2023, 145(7): 071704.
Paper No: MD-22-1782
https://doi.org/10.1115/1.4062313
Published Online: May 18, 2023
View Article titled, Comparing Mechanical Neural-Network Learning Algorithms
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Topics: Algorithms, Artificial neural networks, Simulation
Proceedings Papers

Design of a Graphene Nanoribbon Electrostatic Discharge Compliant Mechanism

Talmage H. Jones, Jimmy Ng, Ya-Hong Xie, Jonathan B. Hopkins
Proc. ASME. IDETC-CIE2018, Volume 5A: 42nd Mechanisms and Robotics Conference, V05AT07A016, August 26–29, 2018
Publisher: American Society of Mechanical Engineers
Paper No: DETC2018-86069
https://doi.org/10.1115/DETC2018-86069
View Paper titled, Design of a Graphene Nanoribbon Electrostatic Discharge Compliant Mechanism
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Topics: Compliant mechanisms, Design, Graphene, Stress, Boundary-value problems, Capacitance, Chemical vapor deposition, Elastic constants, Engineering simulation, Failure
Proceedings Papers

Geometry Optimization of Flexure System Topologies Using the Boundary Learning Optimization Tool (BLOT)

Ali Hatamizadeh, Yuanping Song, Jonathan B. Hopkins
Proc. ASME. IDETC-CIE2017, Volume 5A: 41st Mechanisms and Robotics Conference, V05AT08A009, August 6–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: DETC2017-67465
https://doi.org/10.1115/DETC2017-67465
View Paper titled, Geometry Optimization of Flexure System Topologies Using the Boundary Learning Optimization Tool (BLOT)
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Topics: Bending (Stress), Geometry, Optimization, Topology, Design, Algorithms, Artificial neural networks, Trains
Journal Articles

Mobility and Constraint Analysis of Interconnected Hybrid Flexure Systems Via Screw Algebra and Graph Theory

Frederick Sun, Jonathan B. Hopkins
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. June 2017, 9(3): 031018.
Paper No: JMR-16-1363
https://doi.org/10.1115/1.4035993
Published Online: March 27, 2017
View Article titled, Mobility and Constraint Analysis of Interconnected Hybrid Flexure Systems Via Screw Algebra and Graph Theory
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Topics: Bending (Stress), Mechanical admittance, Screws, Space, Topology, Algebra
Proceedings Papers

Mobility Analysis of Interconnected Hybrid Flexure Systems Using Screw Algebra and Graph Theory

Frederick Sun, Jonathan B. Hopkins
Proc. ASME. IDETC-CIE2016, Volume 5A: 40th Mechanisms and Robotics Conference, V05AT07A006, August 21–24, 2016
Publisher: American Society of Mechanical Engineers
Paper No: DETC2016-59206
https://doi.org/10.1115/DETC2016-59206
View Paper titled, Mobility Analysis of Interconnected Hybrid Flexure Systems Using Screw Algebra and Graph Theory
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Topics: Algebra, Bending (Stress), Mechanical admittance, Screws, Space, Compliant mechanisms, Finite element analysis, Shapes
Journal Articles

Design of Nonperiodic Microarchitectured Materials That Achieve Graded Thermal Expansions

Jonathan B. Hopkins, Lucas A. Shaw, Todd H. Weisgraber, George R. Farquar, Chris D. Harvey, Christopher M. Spadaccini
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. October 2016, 8(5): 051010.
Paper No: JMR-15-1265
https://doi.org/10.1115/1.4032248
Published Online: May 4, 2016
View Article titled, Design of Nonperiodic Microarchitectured Materials That Achieve Graded Thermal Expansions
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Topics: Design, Thermal expansion, Young's modulus, Temperature, Topology, Stiffness, Finite element analysis
Journal Articles

Polytope Sector-Based Synthesis and Analysis of Microstructural Architectures With Tunable Thermal Conductivity and Expansion

Jonathan B. Hopkins, Yuanping Song, Howon Lee, Nicholas X. Fang, Christopher M. Spadaccini
Journal: Journal of Mechanical Design
Publisher: ASME
Article Type: Research-Article
J. Mech. Des. May 2016, 138(5): 051401.
Paper No: MD-15-1227
https://doi.org/10.1115/1.4032809
Published Online: March 11, 2016
View Article titled, Polytope Sector-Based Synthesis and Analysis of Microstructural Architectures With Tunable Thermal Conductivity and Expansion
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Topics: Architecture, Temperature, Thermal conductivity, Thermal expansion, Design, Finite element analysis, Topology
Proceedings Papers

A Shape-Controlled Compliant Microarchitectured Material

Lucas A. Shaw, Jonathan B. Hopkins
Proc. ASME. IDETC-CIE2015, Volume 5A: 39th Mechanisms and Robotics Conference, V05AT08A010, August 2–5, 2015
Publisher: American Society of Mechanical Engineers
Paper No: DETC2015-46643
https://doi.org/10.1115/DETC2015-46643
View Paper titled, A Shape-Controlled Compliant Microarchitectured Material
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Topics: Shapes, Aircraft, Deformation, Design, Fuel efficiency, Materials properties, Modeling, Optics, Texture (Materials), Wings
Proceedings Papers

Organizing Cells Within Non-Periodic Microarchitectured Materials That Achieve Graded Thermal Expansions

Jonathan B. Hopkins, Lucas A. Shaw, Todd H. Weisgraber, George R. Farquar, Christopher D. Harvey, Christopher M. Spadaccini
Proc. ASME. IDETC-CIE2015, Volume 2B: 41st Design Automation Conference, V02BT03A005, August 2–5, 2015
Publisher: American Society of Mechanical Engineers
Paper No: DETC2015-46638
https://doi.org/10.1115/DETC2015-46638
View Paper titled, Organizing Cells Within Non-Periodic Microarchitectured Materials That Achieve Graded Thermal Expansions
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Topics: Design, Finite element analysis, Geometry, Matlab, Stiffness, Temperature, Thermal expansion, Young's modulus
Proceedings Papers

Polytope Sector-Based Synthesis and Analysis of Microarchitectured Materials With Tunable Thermal Conductivity and Expansion

Jonathan B. Hopkins, Howon Lee, Nicholas X. Fang, Christopher M. Spadaccini
Proc. ASME. IDETC-CIE2015, Volume 2B: 41st Design Automation Conference, V02BT03A006, August 2–5, 2015
Publisher: American Society of Mechanical Engineers
Paper No: DETC2015-46645
https://doi.org/10.1115/DETC2015-46645
View Paper titled, Polytope Sector-Based Synthesis and Analysis of Microarchitectured Materials With Tunable Thermal Conductivity and Expansion
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Topics: Thermal conductivity, Architecture, Thermal expansion, Analytical methods, Design
Journal Articles

An Actively Controlled Shape-Morphing Compliant Microarchitectured Material

Lucas A. Shaw, Jonathan B. Hopkins
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. April 2016, 8(2): 021019.
Paper No: JMR-15-1098
https://doi.org/10.1115/1.4031168
Published Online: November 24, 2015
View Article titled, An Actively Controlled Shape-Morphing Compliant Microarchitectured Material
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Topics: Actuators, Design, Shapes, Stress
Journal Articles

A Visualization Approach for Analyzing and Synthesizing Serial Flexure Elements

Jonathan B. Hopkins
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. August 2015, 7(3): 031011.
Paper No: JMR-14-1005
https://doi.org/10.1115/1.4028727
Published Online: August 1, 2015
View Article titled, A Visualization Approach for Analyzing and Synthesizing Serial Flexure Elements
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Topics: Bending (Stress), Space
Journal Articles

Eliminating Underconstraint in Double Parallelogram Flexure Mechanisms

Robert M. Panas, Jonathan B. Hopkins
Journal: Journal of Mechanical Design
Publisher: ASME
Article Type: Research-Article
J. Mech. Des. September 2015, 137(9): 092301.
Paper No: MD-14-1409
https://doi.org/10.1115/1.4030773
Published Online: July 17, 2015
View Article titled, Eliminating Underconstraint in Double Parallelogram Flexure Mechanisms
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Topics: Bearings, Bending (Stress), Compliant mechanisms, Degrees of freedom, Design, Dynamics (Mechanics), Errors, Finite element analysis, Flexure mechanisms, Kinematics
Journal Articles

Synthesis and Analysis of Soft Parallel Robots Comprised of Active Constraints

Jonathan B. Hopkins, Jordan Rivera, Charles Kim, Girish Krishnan
Journal: Journal of Mechanisms and Robotics
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. February 2015, 7(1): 011002.
Paper No: JMR-14-1255
https://doi.org/10.1115/1.4029324
Published Online: February 1, 2015
View Article titled, Synthesis and Analysis of Soft Parallel Robots Comprised of Active Constraints
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Topics: Robots, Stiffness, Stress, Wire, Actuators, Finite element analysis, Kinematics, Pressure, Rotation
Proceedings Papers

Optimal Actuation of Dynamically Driven Serial and Hybrid Flexure Systems

Jonathan B. Hopkins, Yuanping Song, Shaoyu Wang, Amir H. Behbahani, Ilya Josefson
Proc. ASME. IDETC-CIE2014, Volume 5A: 38th Mechanisms and Robotics Conference, V05AT08A043, August 17–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: DETC2014-35181
https://doi.org/10.1115/DETC2014-35181
View Paper titled, Optimal Actuation of Dynamically Driven Serial and Hybrid Flexure Systems
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Topics: Bending (Stress), Actuators, Errors, Degrees of freedom, Mathematics, Space
Proceedings Papers

Synthesizing Soft Parallel Robots Comprised of Active Constraints

Jordan Rivera, Jonathan B. Hopkins, Charles Kim
Proc. ASME. IDETC-CIE2014, Volume 5A: 38th Mechanisms and Robotics Conference, V05AT08A034, August 17–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: DETC2014-34551
https://doi.org/10.1115/DETC2014-34551
View Paper titled, Synthesizing Soft Parallel Robots Comprised of Active Constraints
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Topics: Robots, Actuators, Degrees of freedom, Design, Kinematics, Manufacturing, Space, Stress
Proceedings Papers

Analyzing and Designing Serial Flexure Elements

Jonathan B. Hopkins
Proc. ASME. IDETC-CIE2013, Volume 6A: 37th Mechanisms and Robotics Conference, V06AT07A026, August 4–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: DETC2013-12473
https://doi.org/10.1115/DETC2013-12473
View Paper titled, Analyzing and Designing Serial Flexure Elements
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Topics: Bending (Stress), Design
Proceedings Papers

Synthesizing the Compliant Microstructure of Thermally Actuated Materials Using Freedom, Actuation, and Constraint Topologies

Jonathan B. Hopkins, Kyle J. Lange, Christopher M. Spadaccini
Proc. ASME. IDETC-CIE2012, Volume 4: 36th Mechanisms and Robotics Conference, Parts A and B, 249-258, August 12–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: DETC2012-70479
https://doi.org/10.1115/DETC2012-70479
View Paper titled, Synthesizing the Compliant Microstructure of Thermally Actuated Materials Using Freedom, Actuation, and Constraint Topologies
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Topics: Actuators, Architecture, Bulk solids, Design, Screws, Shapes, Thermal expansion, Thermal properties