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  • 1.
    Ericson, Liselott
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Kärnell, Samuel
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Hochwallner, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Experimental Investigation of a Displacement-controlled Hydrostatic Pump/Motorby Means of Rotating Valve Plate2017Ingår i: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden, Linköping: Linköping University Electronic Press, 2017, Vol. 144, s. 19-27Konferensbidrag (Refereegranskat)
    Abstract [en]

    Interest in the control of variable fluid power pumps/motors has increased in recent years.The actuators used are inefficient and expensive and this reduces the variable units’ usability.This paper introduces displacement control of pumps/motors by means of a rotating valveplate. By changing the angle of the valve plate, the effective use of the stroke is changed. Therotating valve plate is experimentally verified by a modified in-line pump. In the prototype,the valve plate is controlled with a worm gear connected to an electric motor. The resultsshow potential for this kind of displacement control. However, the rotating valve plate createspressure pulsations at part-displacement due to the commutation being performed at highpiston speeds. If the piston speed and hence the flow from each piston is low, the pressurepulsation is acceptable.

  • 2.
    Hochwallner, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    On Motion Control of Linear Incremental Hydraulic Actuators2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Linear Incremental Hydraulic Actuators combine one or more short-stroke cylinders, and two or more engaging/disengaging mechanisms into one actuator with long, medium, or even unlimited stroke length. The motion of each single short-stroke actuator concatenated by the engaging/disengaging mechanisms forms the motion of the linear incremental hydraulic actuator.

    The patterns of how these motions are concatenated form the gaits of a specific linear incremental hydraulic actuator. Linear incremental hydraulic actuators may have more than one gait. In an application, the gaits may be combined to achieve optimal performance at various operating points.

    The distinguishing characteristic of linear incremental hydraulic actuators is the incremental motion. The term incremental actuator is seen as analogous to the incremental versus absolute position sensor. Incremental actuators realize naturally relative positioning. Incremental motion means also that the behavior does not depend on an absolute position but only on the relative position within a cycle or step.

    Incremental actuators may realize discrete incremental or continuous incremental motion. Discrete incremental actuators can only approach discrete positions, whereby stepper drives are one prominent example. In contrast, continuous incremental actuators may approach any position. Linear electric motors are one example of continuous incremental actuators. The actuator has no inherent limitation in stroke length, as every step or cycle adds only to the state at the beginning of the step or cycle and does not depend on the absolute position. This led to the alternative working title Hydraulic Infinite Linear Actuator.

    Linear incremental hydraulic actuator provides long stroke, high force, and linear motion and has the potential to

    • decrease the necessary resource usage,
    • minimize environmental impact, e.g. from potential oil spillage,
    • extend the range of feasible products: longer, stiffer, better, etc.

    This thesis presents an analysis of the characteristics and properties of linear incremental hydraulic actuators as well as the gaits and possible realizations of some gaits. The gait for continuous, smooth motion with two cylinders is comprehensively studied and a control concept for the tracking problem is proposed. The control concept encapsulates the complexity of the linear incremental hydraulic actuator so that an application does not have to deal with it. One other gait, the ballistic gait, which realizes fast, energy-efficient motion, enabling energy recuperation is studied.

  • 3.
    Hochwallner, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    The Gaits of Linear Incremental Hydraulic Actuators: Digital and mixed mode hydraulic/mechanical motion2019Ingår i: PROCEEDINGS The 10th Workshop on DIGITAL FLUID POWER: DFP19, Linz, 2019Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Linear Incremental Hydraulic Actuators are a class of actuators consisting of one or more double-acting cylinders with are detachable from a common piston rod. The actuator works in a kind of rope-climbing motion. The cylinders engage to the rod, drive the load, disengage and retract. The various patterns, how these base actions of the realized cylinders are concatenated form the gaits of Linear Incremental Hydraulic Actuators. Depending on the gait the base actions are realized digital or continuous. For example, in the gait Smooth Motion engaging / disengaging is realized digital and the driving / retraction continuous. Other gaits may be realized fully digital. This contribution presents the concept of the Linear Incremental Hydraulic Actuator, an overview over various gaits, and how they can be combined to form advantages in applications. Advantages of Linear Incremental Hydraulic Actuators are or may be lower resource utilization and environmental impact, applicable for long or even infinite stroke, and simple integration.

  • 4.
    Hochwallner, Martin
    et al.
    Linz Center of Mechatronics GmbH, Linz, Austria.
    Hörl, Matthias
    Linz Center of Mechatronics GmbH, Linz, Austria.
    Dierneder, Stefan
    Linz Center of Mechatronics GmbH, Linz, Austria.
    Scheidl, Rudolf
    Institute of Machine Design and Hydraulic Drives, J.K. University Linz, Linz, Austria.
    Some Aspects of SysML Application in the Reverse Engineering of Mechatronic Systems2012Ingår i: Computer Aided Systems Theory – EUROCAST 2011: 13th International Conference, Las Palmas de Gran Canaria, Spain, February 6-11, 2011, Revised Selected Papers, Part II / [ed] Roberto Moreno-Díaz, Franz Pichler, Alexis Quesada-Arencibia, Berlin Heidelberg: Springer Berlin/Heidelberg, 2012, s. 81-88Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The focus of this paper is the applicability of SysML for modelling certain aspects of both, mechatronic systems and the corresponding engineering processes. SysML is derived from UML, which was developed for software engineering, with the intention to support the engineering of technical systems in general. Although the usefulness of UML is widely confirmed in the software context, the use of SysML in the more hardware oriented engineering domains and in Mechatronics is still an open issue.

    Mechatronic relevant applications have their focus on automation and software issues, mechanical and electrical hardware aspects, however, are rarely addressed. In an ongoing research project with industry the authors study the potentials of SysML to make the engineering of such systems more structured, better documented and, hence, more transparent.

    In SysML is nearly exclusively studied for the development of new systems. Its application for product improvement or design modification because of changing customer requirements is scarcely reported. In the following sections the authors will focus on these topics, first on mechanical sub-systems since this is seen most critical, and in future on overall mechatronic systems.

  • 5.
    Hochwallner, Martin
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Hydraulic Infinite Linear Actuator: The Ballistic Gait Digital Hydro-Mechanical Motion2017Ingår i: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden DOI: https://doi.org/10.3384/ecp17144 / [ed] Petter Krus, Liselott Ericson and Magnus Sethson, Linköping: Linköping University Electronic Press, 2017, Vol. 144, s. 10-17Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Hydraulic Infinite Linear Actuator, HILA, has been presented in previous publications. The novel actuator consists of one, two or more double-acting cylinders witha common piston rod and hydraulically detachable pistons. In the basic gait, one cylinderalternatingly engages and drives the load while the other retracts. The HILA thus works in akind of rope-climbing motion. The concept also allows other gaits, i.e. patterns of motion.This contribution focuses on the ballistic gait, a pattern of motion where one cylinder engagesto give the load a push. The load then carries on with its motion by inertia, cylinders disen-gaged. The actuator thus realizes hydro-mechanical pulse-frequency modulation (PFM).This gait is energy efficient and able to recuperate energy.

  • 6.
    Hochwallner, Martin
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Motion Control Concepts For The Hydraulic Infinite Linear Actuator2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    This contribution presents the novel Hydraulic Infinite Linear Actuator (HILA). It focuses on the control of motion and is based on simulation and analysis. The novel actuator consists of two symmetric double acting cylinders with a common piston rod and hydraulically detachable pistons. Alternatingly one cylinder engages and drives the load while the other retracts, the HILA thus works in a kind of rope climbing motion. The purpose of this contribution is to study the motion control of the HILA and to mimic the behaviour of a conventional cylinder. The HILA has three degrees of freedom which are temporarily coupled compared with one in a conventional cylinder. Further, the HILA with the chosen hydraulic system has two continuous and two digital control inputs. The challenge to be tackled is to combine the short stroke back and forth motions of the cylinders into a continuous smooth motion of the whole actuator. Results from simulations and analyses show that the investigated concepts can keep the jerk within acceptable limits for many applications.

  • 7.
    Hochwallner, Martin
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Landberg, Magnus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    The Hydraulic Infinite Linear Actuator: properties relevant for control2016Ingår i: 10th International Fluid Power Conference (10. IFK), 2016, Vol. 3, s. 411-424Konferensbidrag (Refereegranskat)
    Abstract [en]

    Rotational hydraulic actuators, e.g. motors, provide infinite stroke as there is no conceptual limit to how far they can turn. By contrast linear hydraulic actuators like cylinders provide only limited stroke by concept. In the world of electrical drives, linear motors provide infinite stroke also for linear motion. In hydraulics, the presented Hydraulic Infinite Linear Actuator is a novelty. This paper presents the novel Hydraulic Infinite Linear Actuator (HILA). The contribution is an assessment of properties relevant for control like high hydraulic stiffness and is based on analysis, simulation and measurements. The Hydraulic Infinite Linear Actuator -- properties relevant for control. Available from: https://www.researchgate.net/publication/298164471_The_Hydraulic_Infinite_Linear_Actuator_--_properties_relevant_for_control [accessed Mar 28, 2017].

  • 8.
    Hochwallner, Martin
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion.
    Pinto, Lie
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Tracking Control for High-Performance Motion of a Hydraulic Infinite Linear Actuator2018Ingår i: IEEE/ASME transactions on mechatronics, ISSN 1083-4435, E-ISSN 1941-014X, Vol. 23, nr 6, s. 2782-2793Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The concept of the hydraulic infinite linear actuator consists of two double-acting cylinders with hydraulically detachable pistons driving a common rod. Alternatingly, one cylinder engages and drives the load, whereas the other retracts; the actuator, thus, works in a kind of rope-climbing motion. The actuator has three degrees of freedom, which are temporarily coupled compared with one in a conventional cylinder. Hence, the actuator is a hybrid system with both continuous and discrete states and control inputs. This paper presents a tracking control problem and a solution for high-performance motion, which is interpreted as utilizing the hardware limits in the sense of velocity, accuracy, smoothness, and usability. The concept is demonstrated by simulation for the case of a rest-to-rest motion, but the intended use cases also include arbitrary trajectories.

  • 9.
    Hörl, Matthias
    et al.
    TRUMPF Maschinen Austria GmbH & Co KG, Pasching, Austria / Linz Center of Mechatronics GmbH, Linz, Austria.
    Hochwallner, Martin
    Linz Center of Mechatronics GmbHLinzAustria.
    Dierneder, Stefan
    Linz Center of Mechatronics GmbH, Linz, Austria.
    Scheidl, Rudolf
    Institute of Machine Design and Hydraulic Drives, J.K. University Linz, Linz, Austria.
    Integration of SysML and Simulation Models for Mechatronic Systems2012Ingår i: Computer Aided Systems Theory – EUROCAST 2011: 13th International Conference, Las Palmas de Gran Canaria, Spain, February 6-11, 2011, Revised Selected Papers, Part II / [ed] Roberto Moreno-Díaz, Franz Pichler, Alexis Quesada-Arencibia, Berlin Heidelberg: Springer Berlin/Heidelberg, 2012, s. 89-96Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Each engineering domain, such as mechanical, electrical, hydraulic and software engineering has developed specialized tools to support its engineering work. Also for the management of the design process a lot of customized tools are used. Most of them have independent programming interfaces making the coupling error prone and resource intensive. In order to better manage the overall system’s aspects - what is essential for a well-founded mechatronic approach - appropriate models and corresponding tools for system description and simulation are necessary.

    All systematic development processes, i.e. conceptual design, detail design and common product refinement process, have to focus on the functional requirements and constraints of the overall system under consideration. Describing and maintaining this structure and all the associated data and documenting its relations with the virtual or real experiments is very helpful for a systematic and reliable development process. This paper analyses the use of SysML as a system description language as well as a modeling and simulation language for the aspects of “System Requirements”, “System Behavior”, and “System Structure” and their interdependence.

  • 10.
    Landberg, Magnus
    et al.
    Saab Aeronaut, Linkoping, Sweden.
    Hochwallner, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    NOVEL LINEAR HYDRAULIC ACTUATOR2016Ingår i: PROCEEDINGS OF THE ASME/BATH SYMPOSIUM ON FLUID POWER AND MOTION CONTROL, 2015, ASME Press, 2016, nr V001T01A054Konferensbidrag (Refereegranskat)
    Abstract [en]

    In the area of linear motion, infinite stroke only is provided by electric actuators today, until now there has been no hydraulic alternative. The novel linear hydraulic actuator consists of two double acting cylinders with a common piston rod. The working principle of this actuator for short movements is that at least one piston is connected to the piston rod and the actuator works like an ordinary hydraulic double acting cylinder. For longer movements one of the pistons is connected alternatively to the piston rod providing the drive. In this way the two pistons are moving the piston rod alternatingly in a kind of rope climbing motion. The critical element is the clamping mechanism which is an already known machine element but used in this new application. Advantages of this concept are as follows: The actuator is compact. Very long strokes and piston rods are allowed without side effects of common cylinders. This property is the origin of the name "infinite cylinder". The cylinder has small chamber volumes and so high hydraulic stiffness and low capacitance. It has also potentially no external leakage. The cylinder can provide twice the rated force for short strokes. Applications for this feature are the plate opening stroke of injection molding machines, or presses with low work to travel stroke ratio, like a press brake. The paper includes a detailed description of the design and the working principle. One critical component is the clamping mechanism which temporarily connects the pistons to the piston rod. The clamping mechanism together with the piston represents a new kind of machine element in the mechanical engineering field. Here the focus will be on the function and the control strategy. With simulation the proposed control strategy and function will be presented and the performance analyzed. The simulation model is backed up by first results from experiments on the early prototype. The experiments carried out so far on the hydraulic clamping mechanism, which is the critical component in the system show very promising results that the required function can be achieved. Furthermore, the function of the whole cylinder has been simulated with good result. For the full paper results from a functioning prototype is also to be expected.

  • 11.
    Ribeiro, Luis
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Hochwallner, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    On the Design Complexity of Cyberphysical Production Systems2018Ingår i: Complexity, ISSN 1076-2787, E-ISSN 1099-0526, artikel-id 4632195Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Establishing mass-customization practices, in a sustainable way, at a time of increased market uncertainty, is a pressing challenge for modern producing companies and one that traditional automation solutions cannot cope with. Industry 4.0 seeks to mitigate current practices limitations. It promotes a vision of a fully interconnected ecosystem of systems, machines, products, and many different stakeholders. In this environment, dynamically interconnected autonomous systems support humans in multifaceted decision-making. Industrial Internet of Things and cyberphysical systems (CPSs) are just two of the emerging concepts that embody the design and behavioral principles of these highly complex technical systems. The research within multiagent systems in manufacturing, by embodying most of the defining principles of industrial CPSs (ICPSs), is often regarded as a precursor for many of todays emerging ICPS architectures. However, the domain has been fuzzy in specifying clear-cut design objectives and rules. Designs have been proposed with different positioning, creating confusion in concepts and supporting technologies. This paper contributes by providing clear definitions and interpretations of the main functional traits spread across the literature. A characterization of the defining functional requirements of ICPSs follows, in the form of a scale, rating systems according to the degree of implementation of the different functions.

  • 12.
    Ribeiro, Luis
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Karnouskos, Stamatis
    SAP, Germany.
    Leitao, Paulo
    Inst Politecn Braganca, Portugal.
    Barbosa, Jose
    Inst Politecn Braganca, Portugal.
    Hochwallner, Martin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Performance assessment of the integration between industrial agents and low-level automation functions2018Ingår i: 2018 IEEE 16TH INTERNATIONAL CONFERENCE ON INDUSTRIAL INFORMATICS (INDIN), IEEE , 2018, s. 121-126Konferensbidrag (Refereegranskat)
    Abstract [en]

    The increasing need for more adaptive production environments is a big motivator for the adoption of agent-based technologies in industrial systems, as they provide better mechanisms for handling dynamically and intelligently various kinds of production disturbances. Unlike with the utilization of most conventional automation languages, the use of agents enables, in an easy way, the setup of dynamic and autonomous adaptive processes to handle large and complex engineering system functions and interactions. Agent-technologies in cyber-physical systems contexts require at some point integration with automation controllers. However, most commonly available and used agent system implementations in the industry were not designed for hard real-time control use cases, and do not utilize real-time operating systems or dedicated hardware. Hence, they cannot match the hard-real-time performance of automation controllers. This work provides some insights on the performance that can be achieved with agent-based approaches that integrate with low-level automation system functions. It considers the performance of the agent-based practices in light of non-real-time dedicated hardware or operating systems. The results show that agents are well suited for the majority of soft-real-time control applications.

1 - 12 av 12
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