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Proceedings Papers

An Experimental Study on High-Flowrate Ultrasonic Particle Monitoring in Oil Hydraulics

Per Johansen, Michael M. Bech, Sune Dupont, Uffe N. Christiansen, Jens L. Sørensen, David N. Østedgaard-Munck, Anders Bentien
Proc. ASME. FPMC2022, BATH/ASME 2022 Symposium on Fluid Power and Motion Control, V001T01A035, September 14–16, 2022
Paper No: FPMC2022-89721
DOI: https://doi.org/10.1115/FPMC2022-89721
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Topics: Hydraulics, Particulate matter, Sensors, Engineering prototypes, Experimental analysis, Contamination, Oils, Petroleum, Electromagnetic scattering, Hydraulic circuits
Proceedings Papers

In-Situ Lubrication Film Thickness Measurements in a Radial Piston Motor Using Adaptive Ultrasound Reflectometry

Elias Vagn Hansen, Jens Rendbæk, Lasse Almind Jensen, Per Johansen
Proc. ASME. FPMC2022, BATH/ASME 2022 Symposium on Fluid Power and Motion Control, V001T01A025, September 14–16, 2022
Paper No: FPMC2022-89380
DOI: https://doi.org/10.1115/FPMC2022-89380
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Topics: Engines, Film thickness, Lubrication, Motors, Pistons, Ultrasound, Machinery, Calibration, Dynamics (Mechanics), Kalman filters
Proceedings Papers

Tribotronics in Electro-Hydraulic Actuator Technology: Improving Durability by Control

Nikolaj Grønkær, Per Johansen, Kenneth Vorbøl Hansen, Lasse Schmidt
Proc. ASME. FPMC2020, BATH/ASME 2020 Symposium on Fluid Power and Motion Control, V001T01A008, September 9–11, 2020
Paper No: FPMC2020-2721
DOI: https://doi.org/10.1115/FPMC2020-2721
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Topics: Actuators, Bearings, Design, Durability, Energy efficiency, Failure, Hydraulic cylinders, Journal bearings, Lubrication, Pumps
Proceedings Papers

The Challenge of Feedback in Fluid Power Tribotronic Control Systems

Per Johansen, Nikolaj Grønkær, Andreas Langbak, Simon Krempin, Lasse Schmidt
Proc. ASME. FPMC2020, BATH/ASME 2020 Symposium on Fluid Power and Motion Control, V001T01A025, September 9–11, 2020
Paper No: FPMC2020-2756
DOI: https://doi.org/10.1115/FPMC2020-2756
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Topics: Control systems, Feedback, Fluids, Tribology, Journal bearings, Feedforward control, Fluid films, Modeling analysis, Reliability, Risk
Proceedings Papers

Four Quadrant Hybrid Control Oriented Dynamical System Model of Digital Displacement ® Units

Niels H. Pedersen, Per Johansen, Torben O. Andersen
Proc. ASME. FPMC2018, BATH/ASME 2018 Symposium on Fluid Power and Motion Control, V001T01A039, September 12–14, 2018
Paper No: FPMC2018-8874
DOI: https://doi.org/10.1115/FPMC2018-8874
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Topics: Displacement, Dynamic systems, Hybrid control, Pressure, Feedback, Machinery, Approximation, Discrete systems, Dynamics (Mechanics), Fluids
Proceedings Papers

A Robust Control Concept for Hydraulic Drives Based on Second Order Sliding Mode Disturbance Compensation

Lasse Schmidt, Torben O. Andersen, Per Johansen, Henrik C. Pedersen
Proc. ASME. FPMC2017, ASME/BATH 2017 Symposium on Fluid Power and Motion Control, V001T01A033, October 16–19, 2017
Paper No: FPMC2017-4265
DOI: https://doi.org/10.1115/FPMC2017-4265
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Topics: Hydraulic drive systems, Robust control, Algorithms, Dynamics (Mechanics), Low-pass filters, Valves, Approximation, Design, Hardware, Robustness
Proceedings Papers

Event-Driven Control of a Speed Varying Digital Displacement Machine

Niels H. Pedersen, Per Johansen, Torben O. Andersen
Proc. ASME. FPMC2017, ASME/BATH 2017 Symposium on Fluid Power and Motion Control, V001T01A029, October 16–19, 2017
Paper No: FPMC2017-4260
DOI: https://doi.org/10.1115/FPMC2017-4260
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Topics: Displacement, Machinery, Control equipment, Control theory, Feedback, Design, Differential equations, Electric motors, Engines, Fluids
Proceedings Papers

Investigation of Squeeze Film Damping and Associated Loads

Per Johansen, Niels C. Bender, Anders H. Hansen, Lasse Schmidt
Proc. ASME. FPMC2017, ASME/BATH 2017 Symposium on Fluid Power and Motion Control, V001T01A050, October 16–19, 2017
Paper No: FPMC2017-4300
DOI: https://doi.org/10.1115/FPMC2017-4300
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Topics: Damping, Stress, Valves, Equations of motion, Hydraulics, Viscosity, Design, Fluids, Lubrication theory, Pressure
Journal Articles

Discrete Linear Time Invariant Analysis of Digital Fluid Power Pump Flow Control

Per Johansen, Daniel B. Roemer, Torben O. Andersen, Henrik C. Pedersen
Journal: Journal of Dynamic Systems, Measurement, and Control
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. October 2017, 139(10): 101007.
Paper No: DS-16-1005
DOI: https://doi.org/10.1115/1.4036554
Published Online: June 28, 2017
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Topics: Displacement, Flow (Dynamics), Flow control, Fluids, Pumps, Valves, Approximation, Control equipment, Stress, Design
Proceedings Papers

State of the Art Review on Theoretical Tribology of Fluid Power Displacement Machines

Remzija Ćerimagić, Per Johansen, Torben O. Andersen, Henrik C. Pedersen
Proc. ASME. FPNI2016, 9th FPNI Ph.D. Symposium on Fluid Power, V001T01A026, October 26–28, 2016
Paper No: FPNI2016-1539
DOI: https://doi.org/10.1115/FPNI2016-1539
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Topics: Displacement, Fluids, Machinery, Tribology, Wear, Design, Modeling, Optimization, Reliability, Engineers
Proceedings Papers

Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces

Per Johansen, Daniel B. Roemer, Torben O. Andersen, Henrik C. Pedersen
Proc. ASME. FPNI2016, 9th FPNI Ph.D. Symposium on Fluid Power, V001T01A034, October 26–28, 2016
Paper No: FPNI2016-1554
DOI: https://doi.org/10.1115/FPNI2016-1554
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Topics: Energy dissipation, Friction, Fluids, Tribology, Computer simulation, Lubrication, Approximation, Design, Film thickness, Lubricants
Proceedings Papers

Influence of the Lubricant Thermo-Piezo-Viscous Property on Hydrostatic Bearings in Oil Hydraulics

Per Johansen, Daniel B. Roemer, Torben O. Andersen, Henrik C. Pedersen
Proc. ASME. FPNI2016, 9th FPNI Ph.D. Symposium on Fluid Power, V001T01A031, October 26–28, 2016
Paper No: FPNI2016-1551
DOI: https://doi.org/10.1115/FPNI2016-1551
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Topics: Bearings, Hydraulics, Hydrostatics, Lubricants, Hydrostatic pressure, Approximation, Design, Machinery, Viscosity, Engineers
Proceedings Papers

LQR Feedback Control Development for Wind Turbines Featuring a Digital Fluid Power Transmission System

Niels H. Pedersen, Per Johansen, Torben O. Andersen
Proc. ASME. FPNI2016, 9th FPNI Ph.D. Symposium on Fluid Power, V001T01A024, October 26–28, 2016
Paper No: FPNI2016-1537
DOI: https://doi.org/10.1115/FPNI2016-1537
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Topics: Feedback, Fluids, Wind turbines, Design, Displacement, Engines, Motors, Control equipment, Dynamic models, Machinery
Proceedings Papers

Modeling of Dynamic Fluid Forces in Fast Switching Valves

Daniel B. Roemer, Per Johansen, Henrik C. Pedersen, Torben O. Andersen
Proc. ASME. FPMC2015, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, V001T01A049, October 12–14, 2015
Paper No: FPMC2015-9594
DOI: https://doi.org/10.1115/FPMC2015-9594
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Topics: Fluids, Modeling, Valves, Computational fluid dynamics, Design, Engineering simulation, Optimization, Simulation, Die cutting, Dynamic models
Proceedings Papers

On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor

Per Johansen, Daniel B. Roemer, Torben O. Andersen, Henrik C. Pedersen
Proc. ASME. FPMC2015, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, V001T01A058, October 12–14, 2015
Paper No: FPMC2015-9608
DOI: https://doi.org/10.1115/FPMC2015-9608
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Topics: Cylinders, Density, Displacement, Fluids, Motors, Pistons, Inertia (Mechanics), Simulation, Fluid mechanics, Modeling
Journal Articles

Fluid Stiction Modeling for Quickly Separating Plates Considering the Liquid Tensile Strength

Daniel B. Roemer, Per Johansen, Henrik C. Pedersen, Torben O. Andersen
Journal: Journal of Fluids Engineering
Article Type: Research-Article
J. Fluids Eng. June 2015, 137(6): 061205.
Paper No: FE-14-1595
DOI: https://doi.org/10.1115/1.4029683
Published Online: June 1, 2015
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Topics: Cavitation, Pressure, Stiction, Tensile strength, Tension, Plates (structures)
Proceedings Papers

Analytical Thermal Field Theory Applicable to Oil Hydraulic Fluid Film Lubrication

Per Johansen, Daniel B. Roemer, Henrik C. Pedersen, Torben O. Andersen
Proc. ASME. FPMC2014, ASME/BATH 2014 Symposium on Fluid Power and Motion Control, V001T01A030, September 10–12, 2014
Paper No: FPMC2014-7844
DOI: https://doi.org/10.1115/FPMC2014-7844
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Topics: Field theories (Physics), Fluid film lubrication, Approximation, Cylinders, Dimensional analysis, Energy conservation, Modeling, Numerical analysis, Oils, Petroleum
Proceedings Papers

Oil Stiction in Fast Switching Annular Seat Valves for Digital Displacement Fluid Power Machines

Daniel B. Roemer, Per Johansen, Henrik C. Pedersen, Torben O. Andersen
Proc. ASME. ESDA2014, Volume 2: Dynamics, Vibration and Control; Energy; Fluids Engineering; Micro and Nano Manufacturing, V002T11A021, July 25–27, 2014
Paper No: ESDA2014-20443
DOI: https://doi.org/10.1115/ESDA2014-20443
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Topics: Displacement, Fluids, Machinery, Stiction, Valves, Pressure, Cavitation, High pressure (Physics), Manifolds
Proceedings Papers

Design Method for Fast Switching Seat Valves for Digital Displacement ® Machines

Daniel B. Roemer, Per Johansen, Henrik C. Pedersen, Torben O. Andersen
Proc. ASME. FPNI2014, 8th FPNI Ph.D Symposium on Fluid Power, V001T01A012, June 11–13, 2014
Paper No: FPNI2014-7852
DOI: https://doi.org/10.1115/FPNI2014-7852
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Topics: Design methodology, Displacement, Machinery, Valves, Design, Pressure, Dynamics (Mechanics), Electromagnetic actuators, Energy dissipation, Fluid dynamics
Journal Articles

Asymptotic Approximation of Laminar Lubrication Thermal Field at Low Reduced Peclet and Brinkman Number

Per Johansen, Daniel B. Roemer, Torben O. Andersen, Henrik C. Pedersen
Journal: Journal of Tribology
Article Type: Research-Article
J. Tribol. October 2014, 136(4): 041706.
Paper No: TRIB-13-1248
DOI: https://doi.org/10.1115/1.4027957
Published Online: July 29, 2014
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Topics: Approximation, Convection, Heat conduction, Lubricants, Lubrication, Temperature, Film thickness, Boundary-value problems