Shad Roundy portrait
  • Adjunct Associate Professor, Elect & Computer Engineering
  • Associate Professor, Mechanical Engineering
801-581-4304

Publications

  • Khan, F., Kowalchik, T., Roundy, S. & Warren, R. (2021). Stretching-induced phase transitions in barium titanate-poly (vinylidene fluoride) flexible composite piezoelectric films. Scripta Materiala. Published, 03/2021.
    https://www.sciencedirect.com/science/article/abs/...
  • Truong, B. D., Andersen, E., Casados, C. & Roundy, S. (2020). Magnetoelectric wireless power transfer for biomedical implants: Effects of non-uniform magnetic field, alignment and orientation. Sensors and Actuators A: Physical. Published, 12/2020.
    https://www.sciencedirect.com/science/article/abs/...
  • Palombo, T., Campos, A., Vernon, S.D. & Roundy, S. (2020). Accurate and objective determination of myalgic encephalomyelitis/chronic fatigue syndrome disease severity with a wearable sensor. Journal of Translational Medicine. Published, 11/2020.
    https://translational-medicine.biomedcentral.com/a...
  • Rantz, R. & Roundy, S. (2020). Dynamics of Wrist-Worn Eccentric-Rotor Energy Harvesters. Physical Review Applied. Published, 07/2020.
    https://journals.aps.org/prapplied/abstract/10.110...
  • Truong, B. D. & Roundy, S. (2020). Experimentally validated model and power optimization of a magnetoelectric wireless power transfer system in free-free configuration. Smart Materials and Structures. Published, 07/2020.
    https://iopscience.iop.org/article/10.1088/1361-66...
  • Truong, B. D., Roundy, C., Rantz, R. & Roundy, S. (2020). Energy harvesting and wireless power transfer in a unified system for wearable devices. 2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS). Published, 04/2020.
    https://ieeexplore.ieee.org/abstract/document/9080...
  • Andersen, E, Truong, B. D. & Roundy, S. (2020). Optimal Coil Design for Wireless Powering of Biomedical Implants Considering Safety Constraints. In 2019 IEEE Wireless Power Transfer Conference (WPTC). Published, 04/2020.
    https://ieeexplore.ieee.org/abstract/document/9055...
  • Truong, B. D., Wang, D., Xue, T., Trolier-McKinstry, S. & Roundy, S. (2019). Experiments on a wireless power transfer system for wearable device with sol-gel thin-film PZT. Journal of Physics: Conference Series. Published, 11/2019.
    https://iopscience.iop.org/article/10.1088/1742-65...
  • Misra, V., Bozkurk,A., Calhoun, B. H., Data, S., Dickey, M., Kiani, M., Oralkan, O, Ozturk, M., Rajagopalan, R., Roundy, S., Strohmaier, J., Trolier-McKinstry, S., Vashae, D., Wentzloff, D. & Werner, D. (2019). Optimizing the energy balance to achieve autonomous self-powering for vigilant health and IoT applications. Journal of Physics: Conference Series. Published, 11/2019.
    https://iopscience.iop.org/article/10.1088/1742-65...
  • Halim, M. A., Xue, T., Rantz, R., Zhang, Q., Gu, L., Yang, K. & Roundy, S. (2019). Fabrication and characterization of a wrist-driven rotational energy harvester using multiple plucked piezoelectric unimorphs. Journal of Physics: Conference Series. Published, 11/2019.
    https://iopscience.iop.org/article/10.1088/1742-65...
  • Yu, Y., Nguyen, T., Tathireddy, P., Roundy, S. & Young, D. J. (2019). An in-vitro Study of Wireless Inductive Sensing and Robust Packaging for Future Implantable Hydrogel-based Glucose Monitoring Applications. IEEE Sensors Journal. Published, 10/2019.
    https://ieeexplore.ieee.org/abstract/document/8880...
  • Meng, M., Wang, D., Truong, B. D., Trolier-McKinstry, S., Roundy, S. & Kiani, M (2019). A Multi-Beam Shared-Inductor Reconfigurable Voltage/SECE-Mode Piezoelectric Energy Harvesting Interface Circuit. IEEE Transactions on Biomedical Circuits and Systems. Published, 09/2019.
    https://ieeexplore.ieee.org/abstract/document/8844...
  • Truong, B. B., Williams, S. & Roundy, S. (2019). Experimentally validated model and analytical investigations on power optimization for piezoelectric-based wireless power transfer systems. Journal of Intelligent Material Systems and Structures. Vol. 30, 2464-2477. Published, 09/2019.
    https://journals.sagepub.com/doi/full/10.1177/1045...
  • Basaeri, H., Yu, Y., Young, D. J. & Roundy, S. (2019). Acoustic power transfer for biomedical implants using piezoelectric receivers: effects of misalignment and misorientation. Journal of Micromechanics and Microengineering. Vol. 29. Published, 06/2019.
    https://iopscience.iop.org/article/10.1088/1361-64...
  • Basaeri, H., Yu, Y., Young, D. J. & Roundy, S. (2019). A MEMS-Scale Ultrasonic Power Receiver for Biomedical Implants. IEEE Sensors Letters. Vol. 3, 1-4. Published, 03/2019.
    https://ieeexplore.ieee.org/abstract/document/8664...
  • Rupp, T., Truong, B., Williams, S. & Roundy, S. (2019). Magnetoelectric Transducer Designs for Use as Wireless Power Receivers in Wearable and Implantable Applications. Materials. Published, 02/08/2019.
    https://www.mdpi.com/1996-1944/12/3/512
  • Meng, M, Ibrahim, A., Xue, T., Yeo, H. G., Wang. D., Roundy, S. & Trolier-McKinstry, S. (2019). Multi-Bean Shared-Inductor Reconfigurable Voltage/SECE-Mode Piezoelectric Energy Harvesting of Multi-Axial Human Motion. 2019 IEEE International Solid-State Circuits Conference-(ISSCC). 426-428. Published, 02/2019.
    https://ieeexplore.ieee.org/abstract/document/8662...
  • Roundy, S., Rantz, R., Xue, T. & Halim, M. A. (2018). Inertial Energy Harvesting for Wearables. 2018 IEEE Sensors. Published, 12/27/2018.
  • Halim, M.A., Rantz, R., Zhang, Q., Gu, L., Yang, K. & Roundy, S. (2018). Modeling and Experimental Analysis of a Wearable Energy Harvester that Exploits Human-Body Motion. 2018 IEEE Sensors. Published, 12/27/2018.
    https://ieeexplore.ieee.org/abstract/document/8589...
  • Truong, B. & Roundy, S. (2018). Wireless power transfer system with center-clamped magneto-mechano-electric (MME) receiver: model validation and efficiency investigation. Smart Materials and Structures. Vol. 28, 015004. Published, 11/20/2018.
    https://iopscience.iop.org/article/10.1088/1361-66...
  • Christensen, D. & Roundy, S. (2018). Non-Dimensional Analysis of Depth, Orientation, and Alignment in Acoustic Power Transfer Systems. Smart Materials and Structures. Vol. 27, 125013. Published, 11/13/2018.
    https://iopscience.iop.org/article/10.1088/1361-66...
  • Truong, B., Roundy, C., Andersen, E. & Roundy, S. (2018). Analysis of resonance and anti-resonance frequencies in a wireless power transfer system: analytical model and experiments. IEEE Transactions on Circuits and Systems II: Express Briefs. Published, 10/30/2018.
    https://ieeexplore.ieee.org/abstract/document/8515...
  • Eilertsen, M., Merriweather, A. & Roundy, S. (2018). Characterization of load reduction while lifting drywall using an unpowered drywall lifting device. Work. 1-11. Published, 09/18/2018.
    https://content.iospress.com/articles/work/wor2773
  • Plaizier, G. M. (2018). Design, Modeling, and Analysis of Inductive Resonant Coupling Wireless Power Transfer for Micro Aerial Vehicles (MAVs). 2018 IEEE International Conference on Robotics and Automation (ICRA). Published, 09/13/2018.
    https://ieeexplore.ieee.org/abstract/document/8461...
  • Xue, T., Williams, S., Rantz, R., Halim, M. A. & Roundy, S. (2018). System Modeling, Characterization, and Design Considerations for Generators in Commercial Watches With Application to Energy Harvesting for Wearables. IEEE/ASME Transactions on Mechatronics. Vol. 23, 2515-2524. Published, 08/13/2018.
    https://ieeexplore.ieee.org/abstract/document/8434...
  • Xue, T., Yeo, H.G., Trolier-McKinstry, S. & Roundy, S. (2018). Wearable inertial energy harvester with sputtered bimorph lead zirconate titanate (PZT) thin-film beams. Smart Materials and Structures. Vol. 27, 085026. Published, 07/25/2018.
    https://iopscience.iop.org/article/10.1088/1361-66...
  • Yeo, H.G., Xue, T., Roundy, S., Ma, X., Rahn, C. & Trolier-McKinstry, S. (2018). Strong (001) Oriented Bimorph PZT Film on Metal Foils Grown by rf-Sputtering for Wrist-Worn Piezoelectric Energy Harvesters. Advanced Functional Materials. Vol. 28, 1801327. Published, 07/20/2018.
    https://doi.org/10.1002/adfm.201801327
  • Roundy, S. & Trolier-McKinstry, S. (2018). Materials and approaches for on-body energy harvesting. MRS Bulletin. Vol. 43, 206-213. Published, 03/09/2018.
    https://www.cambridge.org/core/journals/mrs-bullet...
  • Truong, B., Cuong, P. L., Halvorsen, E. & Roundy, S. (2018). Advanced Topology of Power Electronic Interface for MEMS Energy Harvesting with Multiple Transducers. Journal of Physics: Conference Series. Vol. 1052, 012074. Published, 01/01/2018.
    https://doi.org/10.1088/1742-6596/1052/1/012074
  • Rantz, Robert & Roundy, Shad (2017). Characterization of Real-world Vibration and Application to Nonlinear Vibration Energy Harvesters. Energy Harvesting and Systems. Vol. 4, 67-76. Published, 04/07/2017.
    https://www.degruyter.com/view/j/ehs.2017.4.issue-...
  • Xue, T., Roundy, S. 2017. “On magnetic plucking configurations for frequency up-converting mechanical energy harvesters.” Sensors and Actuators A: Physical 253 (2017): 101-111. Published, 01/01/2017.
    http://www.sciencedirect.com/science/article/pii/S...
  • Basaeri, H., Christensen, D., and Roundy, S. 2016. “Ultrasonically Powered Hydrogel-Based Wireless Implantable Glucose Sensor”, IEEE Sensors, Oct. 30 – Nov. 2, 2016, Orlando, FL. Published, 11/02/2016.
    http://ieeexplore.ieee.org/document/7808763/
  • Xue, T., and S. Roundy. 2015. "Analysis of Magnetic Plucking Configurations for Frequency Up-Converting Harvesters." Journal of Physics: Conference Series. Vol. 660. No. 1. IOP Publishing, 2015. Published, 12/10/2015.
    http://iopscience.iop.org/article/10.1088/1742-659...
  • Yu, Y., Bhola, V., Tathireddy, P., Roundy, S., Young, D. 2015. “Inductive Sensing Technique For Low Power Implantable Hydrogel-Based Biochemical Sensors”. IEEE Sensors, November 1-4, 2015, Busan, South Korea. Published, 11/04/2015.
    http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumb...
  • Christensen, D., Roundy, S., 2016 “Ultrasonically-Powered Piezoelectric Plate and Diaphragm Architectures for Bio-implantable Sensors” Journal of Intelligent Material Systems and Structures. 27.8 (2016): 1092-1105. Published, 05/25/2015.
    http://jim.sagepub.com/content/early/2015/05/21/10...
  • Briand D., Yeatman E., Roundy, S. Micro Energy Harvesting, Wiley-VCH, Weinheim, Germany. Published, 05/15/2015.
    http://onlinelibrary.wiley.com/book/10.1002/978352...
  • Heit, J., Roundy, S., 2015 “A Framework to Determine the Upper Bound on Extractable Power as a Function of Input Vibration Parameters”, Energy Harvesting and Systems, March, 2015, DOI: 10.1515/ehs-2014-0059. Published, 03/30/2015.
    http://www.degruyter.com/view/j/ehs.2016.3.issue-1...
  • Xue, T., Ma, X,. Rahn, C., Roundy, S. “Analysis of Upper Bound Power Output for a Wrist-Worn Rotational Energy Harvester from Real-World Measured Inputs.” Journal of Physics: Conference Series. Vol. 557. No. 1. IOP Publishing, 2014. Published, 12/01/2014.
    http://iopscience.iop.org/1742-6596/557/1/012090
  • Heit, J., and S. Roundy. “A Framework for Determining the Maximum Theoretical Power Output for a Given Vibration Energy.” Journal of Physics: Conference Series. Vol. 557. No. 1. IOP Publishing, 2014. Published, 12/01/2014.
    http://iopscience.iop.org/1742-6596/557/1/012020
  • Roundy, S., Tola, J., 2014 “An energy harvester for rotating environments using offset pendulum and nonlinear dynamics”. Smart Materials and Structures, 23 (2014) 105004. Published, 03/01/2014.
    http://iopscience.iop.org/0964-1726/23/10/105004
  • Christensen, D., Roundy, S., 2013. “Comparative Study of Bio-implantable Acoustic Generator Architectures”, Journal of Physics: Conference Series. Vol. 476, No. 1, p. 012141, 2013. Published, 12/2013.
  • Heit, J., Christensen, D., Roundy, S., 2013. “A Vibration Energy Harvesting Structure, Tunable Over a Wide Frequency Range Using Minimal Actuation.” Proceedings of the ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. SMASIS2013 (September 16-18, 2013, Snowbird, Utah, USA). Published, 09/2013.
  • Roundy, S., Tola, J., 2013. “An Energy Harvester for Rotating Environments Using Offset Pendulum Dynamics”, Transducers 2013 / Eurosensors XXVII: The 17th International Conference on, pp. 689-692. Published, 06/2013.
  • Roundy, S., Takahashi, E., 2013 “A Planar Electromagnetic Energy Harvesting Transducer Using a Multi-pole Magnetic Plate”, Sensors and Actuators: A Phyisical (195) June 2013, pp. 98–104. Published, 06/2013.
    http://www.sciencedirect.com/science/article/pii/S...
  • Roundy, S., Takahashi, E., 2012. “A Cost-effective Planar Electromagnetic Energy Harvesting Transducer”, Technical Digest PowerMEMS 2012 (Atlanta, GA USA 2-5 December 2012) pp. 10-13. Published, 12/05/2012.
  • Bryzek, Janusz & Roundy, Shad (2012). MEMS Testing: Transition from Millions to Billtions to Trillions. (pp. 9-11). Chip Scale Review. Published, 10/08/2012.
    http://www.chipscalereview.com/issues/0912/content...

Research Statement

My lab’s research is broadly focused on micro-sensors (i.e. MEMS) and energy harvesting (i.e. methods for wireless sensors to harvest their own energy making them battery-free). We have significant current research efforts on harvesting energy from human motion to power wearable sensors and harvesting energy from temperature changes (pyroelectric energy harvesting). We have also done a signficant amount of work on harvesting energy from machine vibrations. These harvesters employ small-scale piezoelectric and electmagnetic energy harvesting. Our energy harvesting work includes methods of wireless power transfer, especially for biomedical implants using both magnetic field transmission and ultrasound.

Our sensing work is currently focused inertial sensing (i.e. accelerometers and gyroscopes) applied to biomedical applications and soil sensing for agricultural applications. We also work on micro-pumps for biomedical applications.

Research Keywords

  • Sensing Devices and Transducers
  • Microelectromechanical Systems (MEMS)
  • Energy harvesting and energy storage

Presentations

  • "Energy Harvesting for Wearables: with a Focus on Energy from Motion", presented at the PowerMEMS School, Krakow, Poland. Invited Talk/Keynote, Presented, 12/01/2019.
  • "Inertial Energy Harvesting for Wearables", Presented at IEEE Sensors, Dehli, India. Invited Talk/Keynote, Presented, 10/21/2018.
  • Powering the Internet of Things . Invited Talk/Keynote, Presented, 10/17/2018.
  • Self-Powered Wearable Sensing: What is the current state of the art and what is achievable? Presented at Seoul National University. Invited Talk/Keynote, Presented, 10/15/2018.
  • Self-Powered Wearable Sensing: What is the current state of the art and what is achievable? Presented at the University of North Texas. Invited Talk/Keynote, Presented, 09/20/2018.
  • "Energy Harvesting for the Internet of Things" Invited Talk at COMS 2014. Invited Talk/Keynote, Presented, 10/13/2014.

Research Groups

  • Issak Allaire-MacDonald, Undergraduate Student. Mechanical Engineering. 08/15/2020 - present.
  • Julia Dominesey, Undergraduate Student. Mechanical Engineering. 05/15/2019 - present. Awards/Scholarships/Stipends: UROP and REU.
  • Curtis Casados, Undergraduate Student. Mechanical Engineering. 01/01/2019 - 05/15/2020. Awards/Scholarships/Stipends: REU.
  • Michael Peterson, Undergraduate Student. Electrical Engineering. 05/15/2017 - 05/15/2018. Awards/Scholarships/Stipends: UROP.
  • Shane Williams, Undergraduate Student. Mechanical Engineering (BS). 08/17/2015 - 08/15/2018. Awards/Scholarships/Stipends: UROP and REU.
  • William Weatherholtz, Graduate Student. Mechanical Engineering (MS). 08/17/2015 - 05/15/2017.
  • Hamid Basaeri, Graduate Student. Mechanical Engineering (PhD). 08/17/2015 - 05/15/2019.
  • Robert Rantz, Graduate Student. Mechanical Engineering (PhD). 01/01/2015 - 01/01/2019.
  • Hansel Halverson, Undergraduate Student. Mechanical Engineering. 09/01/2014 - 05/01/2015.
  • Jose Ortega, Undergraduate Student. Mechanical Engineering. 01/01/2014 - 05/01/2014.
  • Christian Soto, Undergraduate Student. Mechanical Engineering. 01/01/2014 - 05/01/2014.
  • Josh McCleary, Graduate Student. Mechanical Engineering. 01/01/2014 - 12/31/2014.
  • Tiancheng Xue, Graduate Student. Mechanical Engineering (PhD). 09/01/2013 - 08/15/2018.
  • Mark Eilertsen, Graduate Student. Mechanical Engineering. 09/01/2013 - 12/15/2015.
  • Joseph Brink, Graduate Student. Mechanical Engineering. 10/15/2012 - 12/10/2012.
  • Giman Lee, Undergraduate Student. Electrical Engineering. 09/01/2012 - 05/10/2013.
  • John Heit, Graduate Student. Mechanical Engineering. 08/20/2012 - 08/01/2014.

Languages

  • Spanish, functional.

Geographical Regions of Interest

  • Germany
    Have collaborative projects with IMTEK at the University of Freiburg.
  • United Kingdom of Great Britain and Northern Ireland
    Have collaborative projects with Imperial College London and the Universtiy of Aberdeen.