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Daniel B. Roemer
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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

A Motion Observer With On-Line Parameter Estimation for Moving-Coil Based Digital Valves in Digital Displacement Machines

Christian Noergaard, Michael M. Bech, Daniel B. Roemer
Proc. ASME. FPNI2016, 9th FPNI Ph.D. Symposium on Fluid Power, V001T01A029, October 26–28, 2016
Paper No: FPNI2016-1543
DOI: https://doi.org/10.1115/FPNI2016-1543
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Topics: Displacement, Machinery, Parameter estimation, Valves, Actuators, Dynamics (Mechanics), Electromotive force, Engineering prototypes, Sensors
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

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
Proceedings Papers

Speed-Variable Switched Differential Pump System for Direct Operation of Hydraulic Cylinders

Lasse Schmidt, Daniel B. Roemer, Henrik C. Pedersen, Torben O. Andersen
Proc. ASME. FPMC2015, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, V001T01A042, October 12–14, 2015
Paper No: FPMC2015-9575
DOI: https://doi.org/10.1115/FPMC2015-9575
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Topics: Hydraulic cylinders, Pumps, Cylinders, Pressure, Design, Displacement, Flow (Dynamics), Gear pumps, Cavitation, Compression
Proceedings Papers

Modelling of Moving Coil Actuators in Fast Switching Valves Suitable for Digital Hydraulic Machines

Christian Noergaard, Daniel B. Roemer, Michael M. Bech
Proc. ASME. FPMC2015, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, V001T01A048, October 12–14, 2015
Paper No: FPMC2015-9593
DOI: https://doi.org/10.1115/FPMC2015-9593
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Topics: Actuators, Hydraulic equipment, Modeling, Valves, Simulation, Transients (Dynamics), Design, Eddies (Fluid dynamics), Finite element analysis, Finite element model
Proceedings Papers

Experimental Validation of Mathematical Framework for Fast Switching Valves Used in Digital Hydraulic Machines

Christian Noergaard, Daniel B. Roemer, Michael M. Bech, Torben O. Andersen
Proc. ASME. FPMC2015, ASME/BATH 2015 Symposium on Fluid Power and Motion Control, V001T01A062, October 12–14, 2015
Paper No: FPMC2015-9612
DOI: https://doi.org/10.1115/FPMC2015-9612
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Topics: Hydraulic equipment, Valves, Actuators, Optimization, Engineering prototypes, Hydraulic motors, Pressure, Wind turbines
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
Proceedings Papers

Simulation of Dynamic Behaviour of a Digital Displacement Motor Using Transient 3D Computational Fluid Dynamics Analysis

Daniel B. Roemer, Per Johansen, Henrik C. Pedersen, Torben O. Andersen
Proc. ASME. FPMC2013, ASME/BATH 2013 Symposium on Fluid Power and Motion Control, V001T01A042, October 6–9, 2013
Paper No: FPMC2013-4469
DOI: https://doi.org/10.1115/FPMC2013-4469
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Topics: Computational fluid dynamics, Displacement, Engines, Motors, Simulation, Transients (Dynamics), Pressure, Valves, Fluids, High pressure (Physics)
Proceedings Papers

Multibody Dynamics of a Fluid Power Radial Piston Motor Including Transient Hydrodynamic Pressure Models in Lubricating Gaps

Per Johansen, Daniel B. Roemer, Torben O. Andersen, Henrik C. Pedersen
Proc. ASME. FPMC2013, ASME/BATH 2013 Symposium on Fluid Power and Motion Control, V001T01A039, October 6–9, 2013
Paper No: FPMC2013-4462
DOI: https://doi.org/10.1115/FPMC2013-4462
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Topics: Engines, Fluids, Motors, Multibody dynamics, Pistons, Pressure, Transients (Dynamics), Machinery, Dynamics (Mechanics), Clearances (Engineering)