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Proceedings Papers

A Digital Hydraulic Full-Bridge Oscillation Transformer

Per Johansen, Anders Hedegaard Hansen
Proc. ASME. FPMC2023, ASME/BATH 2023 Symposium on Fluid Power and Motion Control, V001T01A055, October 16–18, 2023
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2023-111865
https://doi.org/10.1115/FPMC2023-111865
View Paper titled, A Digital Hydraulic Full-Bridge Oscillation Transformer
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Topics: Acoustics, Batteries, Bridges (Structures), Carbon dioxide, Compression, Construction, Construction equipment, Displacement, Electrification, Emissions
Proceedings Papers

Investigation of Lubrication Film Thickness Modeling in Speed Variable Hydraulic Drives Using Adaptive Ultrasound Reflectometry

Elias Vagn Hansen, Per Johansen
Proc. ASME. FPMC2023, ASME/BATH 2023 Symposium on Fluid Power and Motion Control, V001T01A030, October 16–18, 2023
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2023-111587
https://doi.org/10.1115/FPMC2023-111587
View Paper titled, Investigation of Lubrication Film Thickness Modeling in Speed Variable Hydraulic Drives Using Adaptive Ultrasound Reflectometry
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Topics: Film thickness, Hydraulic drive systems, Lubrication, Modeling, Ultrasound
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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2022-89721
https://doi.org/10.1115/FPMC2022-89721
View Paper titled, An Experimental Study on High-Flowrate Ultrasonic Particle Monitoring in Oil Hydraulics
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2022-89380
https://doi.org/10.1115/FPMC2022-89380
View Paper titled, In-Situ Lubrication Film Thickness Measurements in a Radial Piston Motor Using Adaptive Ultrasound Reflectometry
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2020-2721
https://doi.org/10.1115/FPMC2020-2721
View Paper titled, Tribotronics in Electro-Hydraulic Actuator Technology: Improving Durability by Control
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2020-2756
https://doi.org/10.1115/FPMC2020-2756
View Paper titled, The Challenge of Feedback in Fluid Power Tribotronic Control Systems
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2018-8874
https://doi.org/10.1115/FPMC2018-8874
View Paper titled, Four Quadrant Hybrid Control Oriented Dynamical System Model of Digital Displacement ® Units
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Topics: Displacement, Dynamic systems, Hybrid control, Pressure, Feedback, Machinery, Approximation, Discrete systems, Dynamics (Mechanics), Fluids
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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2017-4260
https://doi.org/10.1115/FPMC2017-4260
View Paper titled, Event-Driven Control of a Speed Varying Digital Displacement Machine
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2017-4300
https://doi.org/10.1115/FPMC2017-4300
View Paper titled, Investigation of Squeeze Film Damping and Associated Loads
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Topics: Damping, Stress, Valves, Equations of motion, Hydraulics, Viscosity, Design, Fluids, Lubrication theory, Pressure
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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2017-4265
https://doi.org/10.1115/FPMC2017-4265
View Paper titled, A Robust Control Concept for Hydraulic Drives Based on Second Order Sliding Mode Disturbance Compensation
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Topics: Hydraulic drive systems, Robust control, Algorithms, Dynamics (Mechanics), Low-pass filters, Valves, Approximation, Design, Hardware, Robustness
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
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. October 2017, 139(10): 101007.
Paper No: DS-16-1005
https://doi.org/10.1115/1.4036554
Published Online: June 28, 2017
View Article titled, Discrete Linear Time Invariant Analysis of Digital Fluid Power Pump Flow Control
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPNI2016-1539
https://doi.org/10.1115/FPNI2016-1539
View Paper titled, State of the Art Review on Theoretical Tribology of Fluid Power Displacement Machines
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPNI2016-1554
https://doi.org/10.1115/FPNI2016-1554
View Paper titled, Analysis of the Thermo-Viscous Effect on Friction and Energy Dissipation in Oil Lubricated Interfaces
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPNI2016-1551
https://doi.org/10.1115/FPNI2016-1551
View Paper titled, Influence of the Lubricant Thermo-Piezo-Viscous Property on Hydrostatic Bearings in Oil Hydraulics
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPNI2016-1537
https://doi.org/10.1115/FPNI2016-1537
View Paper titled, LQR Feedback Control Development for Wind Turbines Featuring a Digital Fluid Power Transmission System
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2015-9594
https://doi.org/10.1115/FPMC2015-9594
View Paper titled, Modeling of Dynamic Fluid Forces in Fast Switching Valves
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2015-9608
https://doi.org/10.1115/FPMC2015-9608
View Paper titled, On the Influence of Piston and Cylinder Density in Tribodynamics of a Radial Piston Digital Fluid Power Displacement Motor
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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
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. June 2015, 137(6): 061205.
Paper No: FE-14-1595
https://doi.org/10.1115/1.4029683
Published Online: June 1, 2015
View Article titled, Fluid Stiction Modeling for Quickly Separating Plates Considering the Liquid Tensile Strength
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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
Publisher: American Society of Mechanical Engineers
Paper No: FPMC2014-7844
https://doi.org/10.1115/FPMC2014-7844
View Paper titled, Analytical Thermal Field Theory Applicable to Oil Hydraulic Fluid Film Lubrication
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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
Publisher: American Society of Mechanical Engineers
Paper No: ESDA2014-20443
https://doi.org/10.1115/ESDA2014-20443
View Paper titled, Oil Stiction in Fast Switching Annular Seat Valves for Digital Displacement Fluid Power Machines
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Topics: Displacement, Fluids, Machinery, Stiction, Valves, Pressure, Cavitation, High pressure (Physics), Manifolds