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

Niels Henrik Pedersen, Per Johansen, Torben O. Andersen, Rudolf Scheidl

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

Abstract

Proper feedback control of digital fluid power machines (Pressure, flow, torque or speed control) requires a control oriented model, from where the system dynamics can be analyzed, stability can be proven and design criteria can be specified. The development of control oriented models for hydraulic Digital Displacement Machines (DDM) is complicated due to non-smooth machine behavior, where the dynamics comprises both analog, digital and non-linear elements. For a full stroke operated DDM the power throughput is altered in discrete levels based on the ratio of activated pressure chambers. In this paper, a control oriented hybrid model is established, which combines the continuous non-linear pressure chamber dynamics and the discrete shaft position dependent activation of the pressure chambers. The hybrid machine model is further extended to describe the dynamics of a Digital Fluid Power Transmission (DFPT) comprising two variable speed DDM’s with asynchronous control sampling schemes. A validation with respect to a non-linear dynamical model representing the physical system, shows the usefulness of the hybrid model with respect to feedback control development.
Original languageEnglish
Title of host publicationProceedings of 9th Workshop on Digital Fluid Power, DFP 2017
Number of pages14
PublisherDepartment of Energy Technology, Aalborg University
Publication dateSep 2017
Publication statusPublished - Sep 2017
Event9th Workshop on Digital Fluid Power, DFP 2017 - Aalborg, Denmark
Duration: 7 Sep 20178 Sep 2017

Conference

Conference9th Workshop on Digital Fluid Power, DFP 2017
CountryDenmark
CityAalborg
Period07/09/201708/09/2017

Fingerprint

Feedback control
Fluids
Pressure control
Torque control
Speed control
Power transmission
Flow control
Dynamical systems
Chemical activation
Throughput
Hydraulics
Sampling

Keywords

  • Fluid Power
  • Digital Displacement
  • Hybrid system
  • Control model
  • Event-driven

Cite this

Pedersen, N. H., Johansen, P., Andersen, T. O., & Scheidl, R. (2017). Non-linear hybrid control oriented modelling of a digital displacement machine. In Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017 Department of Energy Technology, Aalborg University.
Pedersen, Niels Henrik ; Johansen, Per ; Andersen, Torben O. ; Scheidl, Rudolf. / Non-linear hybrid control oriented modelling of a digital displacement machine. Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017. Department of Energy Technology, Aalborg University, 2017.
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title = "Non-linear hybrid control oriented modelling of a digital displacement machine",
abstract = "Proper feedback control of digital fluid power machines (Pressure, flow, torque or speed control) requires a control oriented model, from where the system dynamics can be analyzed, stability can be proven and design criteria can be specified. The development of control oriented models for hydraulic Digital Displacement Machines (DDM) is complicated due to non-smooth machine behavior, where the dynamics comprises both analog, digital and non-linear elements. For a full stroke operated DDM the power throughput is altered in discrete levels based on the ratio of activated pressure chambers. In this paper, a control oriented hybrid model is established, which combines the continuous non-linear pressure chamber dynamics and the discrete shaft position dependent activation of the pressure chambers. The hybrid machine model is further extended to describe the dynamics of a Digital Fluid Power Transmission (DFPT) comprising two variable speed DDM’s with asynchronous control sampling schemes. A validation with respect to a non-linear dynamical model representing the physical system, shows the usefulness of the hybrid model with respect to feedback control development.",
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Pedersen, NH, Johansen, P, Andersen, TO & Scheidl, R 2017, Non-linear hybrid control oriented modelling of a digital displacement machine. in Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017. Department of Energy Technology, Aalborg University, 9th Workshop on Digital Fluid Power, DFP 2017, Aalborg, Denmark, 07/09/2017.

Non-linear hybrid control oriented modelling of a digital displacement machine. / Pedersen, Niels Henrik; Johansen, Per; Andersen, Torben O.; Scheidl, Rudolf.

Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017. Department of Energy Technology, Aalborg University, 2017.

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

TY - GEN

T1 - Non-linear hybrid control oriented modelling of a digital displacement machine

AU - Pedersen, Niels Henrik

AU - Johansen, Per

AU - Andersen, Torben O.

AU - Scheidl, Rudolf

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N2 - Proper feedback control of digital fluid power machines (Pressure, flow, torque or speed control) requires a control oriented model, from where the system dynamics can be analyzed, stability can be proven and design criteria can be specified. The development of control oriented models for hydraulic Digital Displacement Machines (DDM) is complicated due to non-smooth machine behavior, where the dynamics comprises both analog, digital and non-linear elements. For a full stroke operated DDM the power throughput is altered in discrete levels based on the ratio of activated pressure chambers. In this paper, a control oriented hybrid model is established, which combines the continuous non-linear pressure chamber dynamics and the discrete shaft position dependent activation of the pressure chambers. The hybrid machine model is further extended to describe the dynamics of a Digital Fluid Power Transmission (DFPT) comprising two variable speed DDM’s with asynchronous control sampling schemes. A validation with respect to a non-linear dynamical model representing the physical system, shows the usefulness of the hybrid model with respect to feedback control development.

AB - Proper feedback control of digital fluid power machines (Pressure, flow, torque or speed control) requires a control oriented model, from where the system dynamics can be analyzed, stability can be proven and design criteria can be specified. The development of control oriented models for hydraulic Digital Displacement Machines (DDM) is complicated due to non-smooth machine behavior, where the dynamics comprises both analog, digital and non-linear elements. For a full stroke operated DDM the power throughput is altered in discrete levels based on the ratio of activated pressure chambers. In this paper, a control oriented hybrid model is established, which combines the continuous non-linear pressure chamber dynamics and the discrete shaft position dependent activation of the pressure chambers. The hybrid machine model is further extended to describe the dynamics of a Digital Fluid Power Transmission (DFPT) comprising two variable speed DDM’s with asynchronous control sampling schemes. A validation with respect to a non-linear dynamical model representing the physical system, shows the usefulness of the hybrid model with respect to feedback control development.

KW - Fluid Power

KW - Digital Displacement

KW - Hybrid system

KW - Control model

KW - Event-driven

M3 - Article in proceeding

BT - Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017

PB - Department of Energy Technology, Aalborg University

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Pedersen NH, Johansen P, Andersen TO, Scheidl R. Non-linear hybrid control oriented modelling of a digital displacement machine. In Proceedings of 9th Workshop on Digital Fluid Power, DFP 2017. Department of Energy Technology, Aalborg University. 2017