• Pontoppidanstræde 111, 1115

    9220 Aalborg Ø

    Denmark

  • Denmark

20122019
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Research Output 2012 2019

  • 35 Article in proceeding
  • 13 Journal article
  • 1 Ph.D. thesis
2019

Adaptive Ultrasound Reflectometry for Lubrication Film Thickness Measurements

Kæseler, R. L. & Johansen, P., Nov 2019, In : Measurement Science and Technology. 31, 2, 10 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
Reflectometry
Thickness measurement
Lubrication
Ultrasound
lubrication

Analysis of the Non-smooth Dynamical Effects and Suitable Operation and Control Strategies for Digital Displacement Units

Pedersen, N. H., Johansen, P. & Andersen, T. O., Mar 2019, Proceedings of the 10th Workshop on Digital Fluid Power.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Downloads (Pure)

Challenges in application of hybrid switched control to digital hydraulic motors

Manganas, I., Andersen, T. O., Johansen, P. & Schmidt, L., Jan 2019, In : Modeling, Identification and Control. 40, 2, p. 125-132 8 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
Hydraulic motors
Hydraulics
Controller
Controllers
Design

Linear Hybrid Dynamical Control of Digital Displacement Units

Pedersen, N. H., Johansen, P. & Andersen, T. O., May 2019, Proceedings of the 16th Scandinavian International Conference on Fluid Power.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

2018
4 Citations (Scopus)
113 Downloads (Pure)

Challenges with Respect to Control of Digital Displacement Hydraulic Units

Pedersen, N. H., Johansen, P. & Andersen, T. O., Jan 2018, In : Modeling, Identification and Control (Online). 39, 2, p. 91-105 15 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
2 Citations (Scopus)

Four quadrant hybrid control oriented dynamical system model of digital displacement ® units

Pedersen, N. H., Johansen, P. & Andersen, T. O., Sep 2018, Proceedings of the Bath/ASME Symposium on Fluid Power and Motion Control, FPMC2018. American Society of Mechanical Engineers, 9 p. FPMC2018-8874

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Dynamical systems
System theory
Feedback control
Modular construction
Differential equations

Isogeometric Tribodynamics of a Radial Piston Fluid Power Motor

Cerimagic, R., Johansen, P. & Andersen, T. O., Jul 2018, Proceedings of the 2018 Global Fluid Power Society PhD Symposium, GFPS 2018. IEEE Press, p. 1-7 7 p. 8472376

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Pistons
Lubrication
Fluids
Hydrodynamics
Engine cylinders

Layer ToF Methods for Ultrasonic Lubrication-film Thickness Measurements

Kæseler, R. L., Johansen, N. W. & Johansen, P., Oct 2018, ICCMA 2018 - Proceedings of the 6th International Conference on Control, Mechatronics and Automation. Association for Computing Machinery, p. 149-153 5 p. (ACM International Conference Proceedings Series).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

lubrication
film thickness
ultrasonics
ultrasonic radiation
hydraulics
2 Citations (Scopus)

Model Predictive Control and Discrete Analysis of Partial Stroke Operated Digital Displacement Unit

Pedersen, N. H., Johansen, P. & Andersen, T. O., Jul 2018, Proceedings of the IEEE Global Fluid Power Society PhD Symposium, GFPS2018. IEEE Press, p. 1-9 9 p. 8472366

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Model predictive control
Energy efficiency
Dynamic analysis
Pumps
3 Citations (Scopus)
101 Downloads (Pure)

Model Predictive Control of Low-Speed Partial Stroke Operated Digital Displacement Pump Unit

Pedersen, N. H., Johansen, P., Hansen, A. H. & Andersen, T. O., Aug 2018, In : Modeling, Identification and Control (Online). 39, 3, p. 167-177 11 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Open Access
File
4 Citations (Scopus)

Optimal control of a wind turbine with digital fluid power transmission

Pedersen, N. H., Johansen, P. & Andersen, T. O., Jan 2018, In : Nonlinear Dynamics. 91, 1, p. 591-607 17 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Wind Turbine
Power transmission
Wind turbines
Optimal Control
Fluid

Spectrum Estimation in Autocalibration of Ultrasonic Reflectometry Methods for Lubrication Film Thickness Measurements

Kæseler, R. L. & Johansen, P., Oct 2018, ICCMA 2018 - Proceedings of the 6th International Conference on Control, Mechatronics and Automation. Association for Computing Machinery, p. 154-158 5 p. (ACM International Conference Proceedings Series).

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Thickness measurement
Lubrication
Film thickness
Ultrasonics
Calibration
2017
3 Citations (Scopus)

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

Schmidt, L., Andersen, T. O., Johansen, P. & Pedersen, H. C., Oct 2017, Proceedings of ASME/Bath 2017 Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Hydraulic drives
Robust control
Low pass filters
Compensation and Redress
Winches
9 Citations (Scopus)

Discrete linear time invariant analysis of digital fluid power pump flow control

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., 1 Oct 2017, In : Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME. 139, 10, 8 p., 101007.

Research output: Contribution to journalJournal articleResearchpeer-review

fluid power
Flow control
Pumps
pumps
Fluids
6 Citations (Scopus)

Event-driven control of a speed varying digital displacement machine

Pedersen, N. H., Johansen, P. & Andersen, T. O., Oct 2017, Proceedings of the 2017 Bath/ASME Symposium on Fluid Power and Motion Control, FPMC2017. American Society of Mechanical Engineers, 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Control theory
Controllers
Control system stability
Sampling
Disturbance rejection
2 Citations (Scopus)

Investigation of Squeeze Film Damping and Associated Loads

Johansen, P., Bender, N. C., Hansen, A. H. & Schmidt, L., Oct 2017, Proceedings of the ASME/BATH Symposium on Fluid Power & Motion Control. American Society of Mechanical Engineers, 9 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Damping
Equations of motion
Hydraulics
Viscosity
Lubrication

Non-linear hybrid control oriented modelling of a digital displacement machine

Pedersen, N. H., Johansen, P., Andersen, T. O. & Scheidl, R., Sep 2017, Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017. Department of Energy Technology, Aalborg University, 14 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearch

Feedback control
Fluids
Pressure control
Torque control
Speed control
2016
1 Citation (Scopus)

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

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., Oct 2016, Proceedings of the 9th FPNI PhD Symposium on Fluid Power. American Society of Mechanical Engineers, 8 p. FPNI2016-1554

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Energy dissipation
Friction
Tribology
Fluids
Numerical models
2 Citations (Scopus)

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

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., Oct 2016, Proceedings of the 9th FPNI PhD Symposium on Fluid Power, 2016. American Society of Mechanical Engineers, 10 p. FPNI2016-1551

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Hydrostatic bearings
Hydrostatic pressure
Lubricants
Hydraulics
Bearings (structural)
6 Citations (Scopus)

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

Pedersen, N. H., Johansen, P. & Andersen, T. O., Oct 2016, Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power. American Society of Mechanical Engineers, 10 p. FPNI2016-1537

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Power transmission
Wind turbines
Feedback control
Fluids
Modulators
3 Citations (Scopus)

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

Cerimagic, R., Johansen, P., Andersen, T. O. & Pedersen, H. C., Oct 2016, Proceedings of the 9th FPNI PhD Symposium on Fluid Power, 2016. American Society of Mechanical Engineers, 10 p. FPNI2016-1539

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Tribology
Fluids
Wear of materials
Elastohydrodynamics
Power transmission

Valve and Manifold considerations for Efficient Digital Hydraulic Machines

Roemer, D. B., Nørgård, C., Bech, M. M. & Johansen, P., Nov 2016, Proceedings of the 8th Workshop on Digital Fluid Power (DFP16). Tampere University of Technology, 2016. Tampere University of Technology, p. 213-227 16 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Open Access
Hydraulics
Actuators
Hydraulic motors
Global optimization
Computer aided design
2015

Delta-Sigma Modulated Displacement of a Digital Fluid Power Pump

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., Feb 2015, Proceedings of the 7th Workshop on Digital Fluid Power. LCM GmbH, p. 1-9 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Modulation
Pumps
Fluids
Delta sigma modulation
Chemical activation
11 Citations (Scopus)

Fluid stiction modeling for quickly separating plates considering the liquid tensile strength

Roemer, D. B., Johansen, P., Pedersen, H. C. & Andersen, T. O., Jun 2015, In : Journal of Fluids Engineering. 137, 6, 8 p., 061205.

Research output: Contribution to journalJournal articleResearchpeer-review

Stiction
Tensile strength
Fluids
Liquids
Cavitation
3 Citations (Scopus)

Modeling of Dynamic Fluid Forces in Fast Switching Valves

Roemer, D. B., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2015, Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, p. 1-10 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Fluid dynamics
Fluids
Computational fluid dynamics
Geometry
Computer simulation
10 Citations (Scopus)

Modeling of movement-induced and flow-induced fluid forces in fast switching valves

Roemer, D. B., Johansen, P., Schmidt, L. & Andersen, T. O., Aug 2015, Proceedings of the 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE Press, p. 978-983 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Fluids
Computational fluid dynamics
Dynamic analysis
Navier Stokes equations
Energy efficiency

Morphological topology generation of a digital fluid power displacement unit using Chebychev-Grübler-Kutzbach constraint

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., Aug 2015, Proceedings of the 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE Press, p. 227-230 4 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Topology
Fluids
Degrees of freedom (mechanics)
Pistons
Wind turbines
7 Citations (Scopus)

On the application of reynolds theory to thermo-piezo-viscous lubrication in oil hydraulics

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., Aug 2015, Proceedings of the 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE Press, p. 58-62 5 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Lubrication
Hydraulics
Reynolds equation
Conservation
Momentum
9 Citations (Scopus)

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

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., Oct 2015, Proceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control, FPMC 2015. American Society of Mechanical Engineers, p. 1-10 10 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Pistons
Fluids
Fluid mechanics
Equations of motion
Lubrication
21 Citations (Scopus)

Optimum Design of a Moving Coil Actuator for Fast-Switching Valves in Digital Hydraulic Pumps and Motors

Roemer, D. B., Bech, M. M., Johansen, P. & Pedersen, H. C., Dec 2015, In : I E E E - A S M E Transactions on Mechatronics. 20, 6, p. 2761-2770 10 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Actuators
Hydraulics
Pumps
Fluids
Electric potential
2014

A Frequency Response Approach to Sliding Control Design for Hydraulic Drives

Schmidt, L., Johansen, P. & Andersen, T. O., Oct 2014, Proceedings of the 9th JFPS International Symposium on Fluid Power. Japan Fluid Power System Society , p. 512-519 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Hydraulic drives
Frequency response
Controllers
Boundary layers
Switching frequency
6 Citations (Scopus)

Analytical Thermal Field Theory Applicable to Oil Hydraulic Fluid Film Lubrication

Johansen, P., Roemer, D. B., Pedersen, H. C. & Andersen, T. O., Sep 2014, Proceedings of the ASME/BATH 2014 Symposium on Fluid Power & Motion Control (FPMC). American Society of Mechanical Engineers, p. 1-8 8 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

hydraulics
fluid
oil
perturbation
energy conservation
6 Citations (Scopus)

Asymptotic approximation of laminar lubrication thermal field at low reduced peclet and Brinkman number

Johansen, P., Roemer, D. B., Andersen, T. O. & Pedersen, H. C., 2014, In : Journal of Tribology. 136, 4, 7 p., TRIB-13-1248.

Research output: Contribution to journalJournal articleResearchpeer-review

Brinkman number
Peclet number
lubrication
Lubrication
convection
3 Citations (Scopus)

Design Method for Fast Switching Seat Valves for Digital Displacement Machines

Roemer, D. B., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2014, Proceedings of the 8th FPNI PhD Symposium on Fluid Power. American Society of Mechanical Engineers, 11 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Seats
Magnetic actuators
Fluid dynamics
Pistons
Strength of materials

Modelling of Spatial Conformal Lubricated Joints in Fluid Power Multibody Systems

Johansen, P., Roemer, D. B., Pedersen, H. C. & Andersen, T. O., Oct 2014, Proceedings of the 9th JFPS International Symposium on Fluid Power. Japan Fluid Power System Society

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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

Johansen, P., Rømer, D., Andersen, T. O. & Pedersen, H. C., 2014, Proceedings of the ASME/BATH 2013 Symposium on Fluid Power & Motion Control: FPMC 2013. American Society of Mechanical Engineers, 10 p. V001T01A039-1

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Pistons
Hydrodynamics
Fluids
Machinery
Lubrication
8 Citations (Scopus)

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

Roemer, D. B., Johansen, P., Pedersen, H. C. & Andersen, T. O., Jun 2014, Proceedings of the 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014. American Society of Mechanical Engineers, 9 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Stiction
Seats
Fluids
Cavitation
Reynolds equation
9 Citations (Scopus)

Optimum design of seat region in valves suitable for digital displacement machines

Roemer, D. B., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2014, In : International Journal of Mechatronics and Automation. 4, 2, p. 116-126 11 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Seats
Fluid
Fluids
Geometry
Stroke

Simulation and Experimental Testing of an Actuator for a Fast Switching On-Off Valve Suitable to Efficient Displacement Machines

Roemer, D. B., Johansen, P., Bech, M. M. & Pedersen, H. C., Oct 2014, Proceedings of the 9th JFPS International Symposium on Fluid Power. Japan Fluid Power System Society , 7 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Actuators
Seats
Testing
Displacement control
Crankshafts
800 Downloads (Pure)

Tribodynamic Modeling of Digital Fluid Power Motors

Johansen, P., Dec 2014, Department of Energy Technology, Aalborg University. 243 p.

Research output: Book/ReportPh.D. thesisResearch

Open Access
File
Fluids
Lubrication
Bearings (structural)
Hydraulic drives
Tribology
2013

A Modelling Approach to Multibody Dynamics of Fluid Power Machinery with Hydrodynamic Lubrication

Johansen, P., Rømer, D., Andersen, T. O. & Pedersen, H. C., 2013, Proceedings of the 8th International Conference on Fluid Power Transmission and Control, ICFP 2013. World Publishing Cooperation, p. 228-232 5 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Lubrication
Machinery
Hydrodynamics
Fluids
Hydraulic drives

Analysis of Valve Requirements for High-Efficiency Digital Displacement Fluid Power Motors

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2013, Proceedings of the 8th International Conference on Fluid Power Transmission and Control , ICFP 2013. World Publishing Cooperation, p. 122-126 5 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Fluids
Plant shutdowns
Mechatronics
10 Citations (Scopus)

Design and modelling of fast switching efficient seat valves for digital displacement pumps

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2013, In : Transactions of the Canadian Society for Mechanical Engineering. 37, 1, p. 71–87 18 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Seats
Pumps
Fluids
Mechatronics
Orifices
2 Citations (Scopus)

Method for Lumped Parameter simulation of Digital Displacement pumps/motors based on CFD

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2013, In : Applied Mechanics and Materials. 397-400, p. 615-620 6 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Computational fluid dynamics
Pumps
Geometry
Seats
Costs
11 Citations (Scopus)

Optimization of geometry of annular seat valves suitable for Digital Displacement fluid power pumps/motors

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., Aug 2013, Proceedings of the 2013 IEEE International Conference on the Mechatronics and Automation (ICMA). IEEE Press, p. 544-549 6 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Seats
Pumps
Fluids
Geometry
Mechatronics
1 Citation (Scopus)

Simulation of dynamic behaviour of a digital displacement motor using transient 3d computational fluid dynamics analysis

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2013, Proceedings of the ASME/BATH 2013 Symposium on Fluid Power and Motion Control: FPMC 2013. American Society of Mechanical Engineers, 10 p. V001T01A042

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Dynamic analysis
Computational fluid dynamics
Fluids
Pistons
Seats
9 Citations (Scopus)

Topology Selection and Analysis of Actuator for Seat Valves suitable for use in Digital Displacement Pumps/Motors

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2013, Proceedings of the 2013 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE Press, p. 418-424 7 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Seats
Actuators
Topology
Pumps
Fluids
2012

Analysis of Dynamic Properties of a Fast Switching On-Off Valve for Digital Displacement Pumps

Rømer, D., Johansen, P., Pedersen, H. C. & Andersen, T. O., 2012, Proceedings of the ASME Symposium on Fluid Power and Motion Control (FPMC 2012). American Society of Mechanical Engineers, p. 151-164 15 p.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Pumps
Controllability
Fluids
3 Citations (Scopus)

Analysis of Temperature's Influence on a Digital Displacement Pump's Volumetric Efficiency

Pedersen, H. C., Johansen, P., Yigen, C., Andersen, T. O. & Rømer, D., 2012, In : Applied Mechanics and Materials. 233, p. 24-27 4 p.

Research output: Contribution to journalJournal articleResearchpeer-review

Pumps
Temperature