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Krus, P., Ericson, L. & Sethson, M. (Eds.). (2017). Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden. Paper presented at 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden
2017 (English)Conference proceedings (editor) (Refereed)
Abstract [en]

SICFP2017

This is the proceedings of the 15th Scandinavian International Conference on Fluid Power held at Linköping University in Sweden on 7-9 June 2017. The theme of the conference was “Fluid Power in the Digital Age”. The contributions are well aligned with this theme, and are indeed reflecting the great developments. We are very grateful to the effort put in by the authors to produce such high quality papers, and also to those taking time to review papers to further enhance the quality. The contributions clearly shows that the fluid power industry, and academia, have both challenges as well as opportunities in keeping up with the evolving capabilities provided by the digitalization. It was with great joy to see old and new colleagues and friends attending our conference and the division of Fluid and mechatronic systems, at Linköping University. The conference is a bi-annual event, with alternating localization between Linköping in Sweden and Tampere in Finland. The process of hosting such an event is a great effort for our organization and I would like to thank all those involved in organizing this conference, and wish good luck with the next one to our Finnish colleagues. Thank you!

Prof. Petter Krus

Head of Division

Fluid and Mechatronic Systems

Review Process

Each author attending the conference days had the opportunity to select from three different ways of presenting their contribution. Firstly, a reviewed process with at least two international reviewers of each contribution. The process resulted in most cases with feedback from the reviewers with comments spanning everything between diagram legends to scientific methods. Some proposed papers where rejected upon recommendations from reviewers. Secondly contributions where also presented in industry sessions where the review process where internal only by the staff of the division. A third extended abstract presentation format where also presented during the conference.

This proceedings contain all presented contributions from the reviewed papers in the first section and thereafter the non-reviewed papers in second section. All reviewed papers are marked in the footer by the acceptance date.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. p. 417
Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 144
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-143820 (URN)10.3384/ecp17144 (DOI)9789176853696 (ISBN)
Conference
15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden
Available from: 2017-12-20 Created: 2017-12-20 Last updated: 2017-12-20Bibliographically approved
Baer, K., Ericson, L. & Krus, P. (2016). Aspects of Parameter Sensitivity for Series Hydraulic Hybrid Light-Weight Duty Vehicle Design. In: Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016): . Paper presented at 9th FPNI Ph.D. Symposium on Fluid Power, Florianópolis, SC, Brazil, October 26–28, 2016. American Society of Mechanical Engineers, Article ID V001T01A041.
Open this publication in new window or tab >>Aspects of Parameter Sensitivity for Series Hydraulic Hybrid Light-Weight Duty Vehicle Design
2016 (English)In: Proceedings of the 9th FPNI Ph.D. Symposium on Fluid Power (FPNI2016), American Society of Mechanical Engineers , 2016, article id V001T01A041Conference paper, Published paper (Refereed)
Abstract [en]

Hybridization of a vehicle’s drivetrain can in principle help to improve its energy efficiency by allowing for recuperation of kinetic energy and modulating the engine’s load. How well this can be realized depends on appropriate sizing and control of the additional components. The system is typically designed sequentially, with the hardware setup preceding the development and tuning of advanced controller architectures. Taking an alternative approach, component sizing and controller tuning can be addressed simultaneously through simulation-based optimization.

The results of such optimizations, especially with standard algorithms with continuous design variable ranges, can however be difficult to realize, considering for example limitations in available components. Furthermore, drive-cycle based optimizations are prone to cycle-beating. This paper examines the results of such simulation-based optimization for a series hydraulic hybrid vehicle in terms of sensitivity to variations in design parameters, system parameters and drive cycle variations. Additional relevant aspects concerning the definition of the optimization problem are pointed out.

Place, publisher, year, edition, pages
American Society of Mechanical Engineers, 2016
Keywords
Weight (Mass), Automotive design, Cycles, Optimization, Control equipment, Simulation, Design, Hybrid electric vehicles, Hardware, Stress
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-135737 (URN)10.1115/FPNI2016-1567 (DOI)978-0-7918-5047-3 (ISBN)
Conference
9th FPNI Ph.D. Symposium on Fluid Power, Florianópolis, SC, Brazil, October 26–28, 2016
Available from: 2017-03-17 Created: 2017-03-17 Last updated: 2018-03-09
Braun, R., Ericson, L. & Krus, P. (2016). Full Vehicle Simulation of Forwarder with Semi Active Suspension using Co-simulation. In: : . Paper presented at ASME/BATH 2015 Symposium on Fluid Power and Motion Control, October 12-14, 2015, Chicago, USA. ASME Press
Open this publication in new window or tab >>Full Vehicle Simulation of Forwarder with Semi Active Suspension using Co-simulation
2016 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A major concern in the forest industry is impact on the soil caused by forest machines during harvesting. A six-wheel pendulum arm forwarder is being developed. The new forwarder aims at reducing soil damage by an even pressure distribution and smooth torque control and thereby also improving the working environment. The suspension contains pendulum arms on each wheel controlled by a hydraulic load sensing system in combination with accumulator.

A natural approach is to model each part of a system in the bestsuited software. In this case, the hydraulic system is modelled in the Hopsan simulation tool, while the vehicle mechanics is modelled in Adams. To understand the whole system it is necessary to simulate all subsystems together. An open standard for this is the Functional Mock-up Interface. This makes it possible to investigate the interaction between the hydraulic system and the multi-body mechanic model.

This paper describes how different simulation tools can be combined to support the development process. The technique is applied to the forwarder’s pendulum suspension. Controllers for height and soil force are optimized to minimize soil damage and maximize comfort for the operator.

Place, publisher, year, edition, pages
ASME Press, 2016
Keywords
System simulation, distributed solvers, parallelism, scheduling, transmission line element method
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:liu:diva-122750 (URN)10.1115/FPMC2015-9588 (DOI)000373970500047 ()
Conference
ASME/BATH 2015 Symposium on Fluid Power and Motion Control, October 12-14, 2015, Chicago, USA
Available from: 2015-11-19 Created: 2015-11-19 Last updated: 2017-12-20Bibliographically approved
Baer, K., Ericson, L. & Krus, P. (2015). Design Study and Parameter Optimization for a Light-Weight Series Hydraulic Hybrid Vehicle. In: : . Paper presented at 14th Scandinavian International Conference on Fluid Power (SICFP'15), Tampere, Finland.
Open this publication in new window or tab >>Design Study and Parameter Optimization for a Light-Weight Series Hydraulic Hybrid Vehicle
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Hydraulic hybrid drives are one potential way of improving the fuel efficiency of vehicles, including the possi-bility of recuperating braking energy in a hydraulic accumulator. The high power density of fluid power is mainly advantageous for heavy vehicles, or duty cycles characterized with frequent braking and acceleration. For smaller vehicles, hydraulic hybrid drives are thus most interesting under urban and suburban driving conditions. Amongst the existing architectures, the series hydraulic hybrid offers the advantage of operating the internal combustion engine independently of the vehicle speed, at the cost of a less efficient transmission path than a purely mechanical one. Previously, a series hydraulics hybrid light-duty vehicle was modelled in the transmission-line modelling (TLM)-based simulation software Hopsan from the division of Fluid and Mechatronic Systems (Flumes) at Linköping University. This paper studies through simulation-based optimi-zation how the fuel-optimal vehicle design is affected by various mixes of urban and suburban driving requirements. Both the system’s hardware and the parameters of a basic control strategy are considered. The results show quite similar designs for most performance requirements combinations, and can be the base for further studies addressing additional requirements, conditions and objectives.

Series
Scandinavian International Conference on Fluid Power (SICFP), ISSN 2342-2726
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-122004 (URN)
Conference
14th Scandinavian International Conference on Fluid Power (SICFP'15), Tampere, Finland
Available from: 2015-10-14 Created: 2015-10-14 Last updated: 2018-03-09
Dell' Amico, A., Ericson, L., Henriksen, F. & Krus, P. (2015). Modelling and experimental verification of a secondary controlled six-wheel pendulum arm forwarder. In: Roberto Paoluzzi (Ed.), the 13th European Conference of ISTVS: . Paper presented at Proceedings of the 13th ISTVS European Conference, Rome, October 21-23, 2015 (pp. 1-10).
Open this publication in new window or tab >>Modelling and experimental verification of a secondary controlled six-wheel pendulum arm forwarder
2015 (English)In: the 13th European Conference of ISTVS / [ed] Roberto Paoluzzi, 2015, p. 1-10Conference paper, Published paper (Refereed)
Abstract [en]

One of the major concerns in the forest industry is the impact on the soil caused by the forest machines duringharvesting, where damages can have a negative impact on e.g. further growth. One of the main reasons is wheel slip.Another concern is the working environment of the operator due to the harsh ground in the forest. Both these issueshave a negative impact on productivity. An attempt to overcome these challenges is made within a collaborative researchproject, which among others also includes Linköping University, where a new six-wheel pendulum arm forwarder isbeing developed. The new forwarder aims at reducing the soil damage by an even pressure distribution and smooth torquecontrol, as well as increased damping of the complete chassis, and thereby improving the working environment. This ispossible since each wheel, driven by its own hydraulic motor, is attached to a pendulum arm allowing to control the heightof each wheel independently of each other. The forwarder has a total maximum weight of 31 tonnes, including 14 tonnesmaximum load. It consists of two steerable joints and is driven by a 360 bhp diesel engine. The transmission consists oftwo hydraulic pumps and six hydraulic motors.This paper deals with the development of the driveline and presents the first experimental tests of the implementedcontrol strategies, where a secondary control approach is chosen for its ability to individually control the torque on eachwheel. The control strategies, presented in the paper, include pressure control, velocity control of the vehicle and ananti-slip controller. To support the development of the control strategies, models of the vehicle and hydraulic subsystemsare derived. The aim with this paper is to verify the concepts on the actual vehicle. The initial results are promising,indicating that the suggested concept is feasible.

Keywords
Secondary control, forest machinery, forwarder, modelling
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-122390 (URN)9781942112464 (ISBN)
Conference
Proceedings of the 13th ISTVS European Conference, Rome, October 21-23, 2015
Available from: 2015-10-30 Created: 2015-10-30 Last updated: 2017-12-20Bibliographically approved
Ericson, L., Dell' Amico, A. & Krus, P. (2015). MODELLING OF A SECONDARY CONTROLLED SIX-WHEEL PENDULUM ARM FORWARDER. In: : . Paper presented at 14th Scandinavian International Conference on Fluid Power (SICFP'15).
Open this publication in new window or tab >>MODELLING OF A SECONDARY CONTROLLED SIX-WHEEL PENDULUM ARM FORWARDER
2015 (English)Conference paper, Published paper (Refereed)
Abstract [en]

One of the major concerns in the forest industry is the impact on the soil caused by the forest machines during harvesting, where damage can have a negative impact on growth at replanting for example. Another concern is the working environment of the operator. Both these issues have a negative impact on productivity. A new six-wheel pendulum arm forwarder is being developed within a collaborative research project. The new forwarder aims to reduce soil damage by means of an even pressure distribution and smooth torque control. This paper presents the first step in the development of the driveline, where a secondary control approach is chosen for its ability to control the motion of each wheel individually. Simulation models of both vehicle and driveline have been constructed developed, partly for the development of the control strategy, and partly for evaluation. A speed control concept and a torque control concept have both been evaluated for different scenarios with regard to their ability to reduce wheel slip. Results have shown that a velocity control approach is more sensitive to kinematic model accuracy while wheel slip is handled automatically. A torque control approach is more robust towards model accuracy while the reduction of slip is dependent on an accurate model.

Series
14th Scandinavian International Conference on Fluid Power (SICFP'15), ISSN 2342-2726
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-118308 (URN)978-952-15-3530-7 (ISBN)
Conference
14th Scandinavian International Conference on Fluid Power (SICFP'15)
Available from: 2015-05-26 Created: 2015-05-26 Last updated: 2017-12-20
Ericson, L. (2014). Swash Plate Oscillations due to Piston Forces in Variable In-line Pumps. In: : . Paper presented at 9th International Fluid Power Conference (IFK), 24-26 March 2014, Aachen, Germany.
Open this publication in new window or tab >>Swash Plate Oscillations due to Piston Forces in Variable In-line Pumps
2014 (English)Conference paper, Published paper (Other academic)
Abstract [en]

This study investigates the oscillations of swash plates caused by piston forces acting on the swash plate. Earlier investigations of variable axial piston pumps assume a fixed swash plate angle, i.e. the swash plate is fixed at different displacement angles. Under normal operating conditions, the swash plate is controlled by a hydraulic actuator which affects the swash plate. The presented models are able to separate different losses caused by the swash plate oscillations and the controller. The results show oscillations on the swash plate which affect both efficiency and flow pulsation and hence the noise level.

Keywords
Fluid power pump/motor, efficiency, noise, flow pulsations
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-106502 (URN)978-3-9816480-0-3 (ISBN)
Conference
9th International Fluid Power Conference (IFK), 24-26 March 2014, Aachen, Germany
Available from: 2014-05-09 Created: 2014-05-09 Last updated: 2017-12-20
Baer, K., Ericson, L. & Krus, P. (2014). System Parameter Study for a Light-Weight Series Hydraulic Hybrid Vehicle. In: PROCEEDINGS OF THE 8TH FPNI PH.D SYMPOSIUM ON FLUID POWER, 2014: . Paper presented at 8th FPNI Ph.D Symposium on Fluid Power, Lappeenranta, Finland, June 11–13, 2014 (pp. V001T03A004). ASME Press
Open this publication in new window or tab >>System Parameter Study for a Light-Weight Series Hydraulic Hybrid Vehicle
2014 (English)In: PROCEEDINGS OF THE 8TH FPNI PH.D SYMPOSIUM ON FLUID POWER, 2014, ASME Press, 2014, p. V001T03A004-Conference paper, Published paper (Refereed)
Abstract [en]

Amongst the hybrid vehicle propulsion solutions aiming to improve fuel efficiency, hybrid electric solutions currently receive most attention, especially on the market. However, hydraulic hybrids are an interesting alternative, especially for heavier vehicles due to higher power density which is beneficial if higher masses are moved. As a step towards a comprehensive design framework to compare several possible hydraulic hybrid architectures for a specified application and usage profile, the model of a series hydraulic hybrid vehicle was previously introduced and initially studied concerning component sizing for an exemplary light-duty vehicle in urban traffic. The vehicle is modeled in the Hopsan simulation tool. A comparably straight-forward engine management is used for the vehicle control; both pump and engine controls are based on the hydraulic accumulator’s state-of-charge. The model is developed further with respect to the accumulator component model. Based on that, the influence of several system and component parameters, such as maximum system pressure and engine characteristics, as well as controller parameters on the vehicle’s performance is analyzed. The goal is to allow for more understanding of the system’s characteristics to facilitate future optimization of the system.

Place, publisher, year, edition, pages
ASME Press, 2014
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-114212 (URN)10.1115/FPNI2014-7840 (DOI)000359389400029 ()978-0-7918-4582-0 (ISBN)
Conference
8th FPNI Ph.D Symposium on Fluid Power, Lappeenranta, Finland, June 11–13, 2014
Available from: 2015-02-13 Created: 2015-02-13 Last updated: 2018-03-09
Krus, P., Sethson, M. & Ericson, L. (Eds.). (2013). 13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden. Paper presented at 13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden. Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden
2013 (English)Conference proceedings (editor) (Refereed)
Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. p. 552
Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 92
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-97367 (URN)978-91-7519-572-8 (ISBN)
Conference
13th Scandinavian International Conference on Fluid Power, June 3-5, 2013, Linköping, Sweden
Available from: 2013-09-10 Created: 2013-09-10 Last updated: 2018-02-21Bibliographically approved
Baer, K., Ericson, L. & Krus, P. (2013). Component Sizing Study for a Light-Duty Series Hydraulic Hybrid Vehicle in Urban Drive Cycles. In: : . Paper presented at 22nd International Congress of Mechanical Engineering (COBEM 2013), November 3-7, 2013, Ribeirão Preto, SP, Brazil (pp. 8368-8376). ABCM – Associação Brasileira de Engenharia e Ciências Mecânicas
Open this publication in new window or tab >>Component Sizing Study for a Light-Duty Series Hydraulic Hybrid Vehicle in Urban Drive Cycles
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

With the focus on energy efficiency for many different kinds of vehicle applications,hybridization is considered a possible solution to reduce fuel consumption. While hybrid electric concepts are already available for passenger vehicles, and also considered for heavier applications, hybrid hydraulic alternatives have been mainly limited to the latter, which benefit most from the higher power density available. To study the different hybrid architectures and applications, a modeling framework for the system design is developed using the simulation tool Hopsan from Linköping University.  Previously,  the  model  of  a  series  hydraulic  hybrid  vehicle  was introduced, a light-duty vehicle simulated over two standard urban drive cycles, and its potential for further work established. In this paper, the model is extended by including a simple combustion engine power management to provide for more realistic propulsion of the hydraulic drivetrain, showing the potential to operate a series hydraulic hybrid vehicle’s engine in more efficient regions. Additionally, the design is studied concerning the effects of a variation of key component sizes on the accuracy and energy efficiency objectives. Instead of subjecting the system to (multi- objective) optimization, at this stage the individual component’s influence is studied, and the objectives are dealt with separately from each other to eliminate the need for compromise   between   them,   both   to   gain a better understanding of the interdependencies.

Place, publisher, year, edition, pages
ABCM – Associação Brasileira de Engenharia e Ciências Mecânicas, 2013
Series
Proceedings of the International Congress of Mechanical Engineering, ISSN 2176-5480 ; 22
Keywords
Series hydraulic hybrid, Hopsan modeling
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-103205 (URN)
Conference
22nd International Congress of Mechanical Engineering (COBEM 2013), November 3-7, 2013, Ribeirão Preto, SP, Brazil
Available from: 2014-01-15 Created: 2014-01-15 Last updated: 2018-03-09
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3877-8147

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