Perry Y. Li
Professor
Department of Mechanical Engineering
University of Minnesota
111 Church St. SE
Minneapolis, MN 55455
Email: lixxx099(at)umn.edu
Tel: 612-626-7815 (Office)
Recent papers
Book chapters:
P. Y. Li, "Isothermal Compressed Air Energy Storage Systems - (i-CAES)", In Encyclopedia in Energy Storage, ed. Wolf-Dieter Steinmann, Elsevier, 2021. (Online access https://doi.org/10.1016/B978-0-12-819723-3.00062-7)
Journals:
M. Aziz, D. Gayme, K. Johnson, J. Konx-Hayes, P. Y. Li, E. Loth, L. Pao, D. R. Sadoway, J. Smith and S. Smith, "A co-design framework for wind energy integrated with storage", Joule 6(9) 21 Sept, 2022, pp. 1995-2015. https://doi.org/10.1016/j.joule.2022.08.014
K. Low, D.R. Berg, and P.Y. Li, "A Novel 3D Ring-Based Flapper Valve for Soft Robotic Applications", Robotics 2022,11(1),2; Dec. 22, 2021. doi:10.3390/robotics11010002
J. Siefert and P. Y. Li, "Optimal Control of the Energy Saving Hybrid Hydraulic-Electric Architecture (HHEA) for Off-Highway Mobile Machines", IEEE Transactions on Control Systems, 2020. DOI: doi:10.1109/TCST.2021.3131435 [Accepted 11.2020]
Conferences:
2023 American Control Conference (ACC 2023):
H. Tranquillo, J. Sonstegard, K. Kim, C.-B. Kwoen, and P. Y. Li, "Online Learning and Control of An Internal Combustion Engine for UAS Using Simplex Tessellation and Recursive Least Squares", 2023 American Control Conference, San Diego, CA, May 2023.
Z. Chen, J. Wu, L. Shen, and P. Y. Li, "A Kalman Filter Approach to the Estimation and Reconstruction of Ocean Wave Fields", 2023 American Control Conference, San Diego, CA, May 2023.
P. Y. Li, "Modeling and Analysis of Linear Digital Hydraulic Transformers (DHT)", 11th Workshop on Digital Fluid Power (DPF 2022), September 19-20, 2022, Edinburgh, Scotland.
2022 ASME/Bath Symposium on Fluid Power and Motion Control (FPMC 2022):
E. Sand and P. Y. Li, "Incorporating a Rotatable Valve Cam to Improve The efficiency of a Hydraulic Motor in an Inline Hydromechanical Transmission (i-HMT)", 2022 Bath/ASME Symposium on Fluid Power and Motion Coontrol (FPMC 2022), Sept 16-19, 2022. Bath, U.K.
J. Wills and P. Y. Li, "Accumulator Sizing for the Hybrid Hydraulic-Electric Architecture (HHEA) Using Dynamic Programming," 2022 Bath/ASME Symposium on Fluid Power and Motion Coontrol (FPMC 2022), Sept 16-19, 2022. Bath, U.K.
2021 ASME/Bath Symposium on Fluid Power and Motion Control (FPMC 2021):
J. Wills, A. Keester, and P.Y.Li, "A POWER TAKE-OFF (PTO) FOR WAVE ENERGY CONVERTERS BASED ON THE HYBRID HYDRAULIC-ELECTRIC ARCHITECTURE (HHEA)", 2021 ASME/Bath Symposium on Fluid Power and Motion Control (FPMC 2021), Oct. 19-21, 2021. (Virtual)
A. Khandekar, J. Wills, M. Wang, and P. Y. Li, "Incorporating Valve Switching Losses Into a Static Optimal Control Algorithm for the Hybrid Hydraulic-Electric Architecture", 2021 ASME/Bath Symposium on Fluid Power and Motion Control (FPMC 2021), Oct. 19-21, 2021. (Virtual)
A. Chatterjee and P.Y.Li, "HIL Testbed and Motion Control Strategy for the Hybrid Hydraulic Electric Architecture (HHEA)", 2021 ASME/Bath Symposium on Fluid Power and Motion Control (FPMC 2021), Oct. 19-21, 2021. (Virtual)
J. Barkei and P. Y. Li, "IMPROVING THE EFFICIENCY OF A COMPACT INLINE HYDRO-MECHANICAL TRANSMISSION (i-HMT) AT LOCK-UP", 2021 ASME/Bath Symposium on Fluid Power and Motion Control (FPMC 2021), Oct. 19-21, 2021. (Virtual)
2021 Modeling, Estimation and Control Conference (MECC'2021) - Inaugural:
J. Floresch and P.Y.Li, "Human Gesture Robot Control Using a Camera/Accelerometer-in-Palm Sensor", 2021 Modeling Estimation and Control Conference (MECC), Oct 24-27, 2021 (Virtual)
Recent presentations
"Combining Hydraulic and Electric Actuation To Improve Efficiency and Control Effectiveness for Off-Road Mobile Machines"
Plenary talk given at the 8th International Conference of Control, Dynamics Systems and Robotic (CDSR 2020), November 2020.
In this presentation, I present the "hybrid hydraulic-electric architecture" for high power mobile machines such as excavators, wheel-loaders, combines and the like. This architecture reaps the benefits of electrification (high efficiency and controllability) without paying the cost of high power electrical components. Control problems, both for minimizing energy use and for following user commands, are presented.
FPMC_2020_2801_Li_Barkei.mp42020 Bath/ASME Symposium on Fluid Power and Motion Control (FPMC 2020), October 2020.
This paper considers how the well-known formulae for incompressible fluid such as continuity, power flow, torque/flow equations of ideal pump/motors should be modified in the presence of compressible fluid. It turns out that all formulae can be essentially preserved as long as the pressure difference term is replaced by the hydraulic effort term which accounts for compressible energy carried by a volume of pressurized fluid. Consistent formulae for volumetric, mechanical and power (total) efficiencies are then derived with the property that the product of volumetric and mechanical efficiencies is the power efficiency.
"Self-Sensing Dual Push-Pull Solenoids using a Finite-Dimensional Flux Observer,”
2020 American Control Conference, July 2020.
In this paper, we present our self-sensing algorithm for determining the position of a pair of solenoids in the push-pull configuration using electrical information (voltages and currents) only. Accuracy up to 0.061mm (or 1.5% of the stroke) is achieved. The key is a consistent model that accounts for eddy current dynamics.