Yang Li


Postdoctoral researcher

yangli@caltech.edu

Yang Li joined the Space Structures Lab in January 2017, and he is currently working on Universal Electromagnetic Surface, in which he is responsible for structural and mechanical parts. 

Before joining this group, he received a D.Phil. (Ph.D.) in Engineering Science from University of Oxford, where he worked on energy absorption of thin-walled structures. Prior to that, he got a B.Eng. in Civil Engineering from Wuhan University, China. 

Projects:

  • Universal Electromagnetic Surface

    This project requires a reconfigurable surface that can morph in between flat, cylindrical, and spherical configurations, which enables the change of field of view of the antenna. During the project, the following techniques have been developed:

    • Computational kinematics: multi-DOF origami mechanisms

      • The focus is on the kinematic pathfinding between two known configurations

      • Solvers: SVD and augmented Lagrangian multiplier

      • Pathfinding algorithms: projection, RRT, and NEB

    • A theory of designing multi-stable structures

      • Purpose: Transform a multi-DOF mechanism into a multi-stable structure with specified stable configurations. This transformation simplifies the actuation in between target configurations

      • Novel second-order kinematics has been developed

      • Novel multi-stability constraints with parameters of compliant hinges as variables are formulated

    • Origami-based prestressed compliant mechanisms

      • An integrated way of implementing specified parameters of compliant hinges

    • A new pure bending testing machine

    • Matric-changing reconfigurable surfaces using fold-in trapeziums

      • New reconfigurable designs proposed by Robert Lang

      • Prestressed compliant hinges are used for easy actuation

    • Buckling beams induced reconfigurable surfaces

  • Collaboration with other group members

    • Design of joints for the spacecraft and deployable mechanisms

  • Work done in Oxford: http://www.yangli.academy/

Publications:

  • Li, Y., You, Z. (2019). Open-Section Origami Beams for Energy Absorption. International Journal of Mechanical Sciences, 157-158, 741-757. doi:10.1016/j.ijmecsci.2019.05.006

  • Li, Y., You, Z. (2019). Origami Concave Tubes for Energy Absorption. International Journal of Solids and Structures, 169, 21–40. https://doi.org/10.1016/j.ijsolstr.2019.03.026

  • Li, Y., Pellegrino, S. (2018). Design of Structures with Multiple Equilibrium Configurations. IDETC/CIE. doi:10.1115/DETC2018-86157.

  • Li, Y., You, Z. (2018). External Inversion of Thin-walled Corrugated Tubes. International Journal of Mechanical Sciences, 144, 54–66. doi:10.1016/j.ijmecsci.2018.05.044

  • Li, Y., You, Z. (2015) Corrugated Tube Inversion for Energy Absorption. In Proceedings of the ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, August 2-5, 2015 in Boston, Massachusetts, USA.

  • Li, Y., You, Z. (2015) Multi-corrugated Indented Foldcore Sandwich Panel for Energy Absorption. In Proceedings of the ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, August 2-5, 2015 in Boston, Massachusetts, USA.

  • Li, Y., You, Z. (2014) Thin Walled Open-Section Origami Beams for Energy Absorption. In Proceedings of the ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, 17-21 August 2014, Buffalo, NY, USA.

  • Li, Y., You, Z. (2014) Origami Thin-Walled Beams and Arches for Energy Absorption. In Proceedings of the 16th Young Researchers’ Conference, 5th March 2013, London, IStructE, pp. 24-25.