liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Operator and Machine Models for Dynamic Simulation of Construction Machinery
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems . Linköping University, The Institute of Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

VIRTUAL PROTOTYPING has been generally adopted in product development in order to minimise the traditional reliance on testing of physical prototypes. It thus constitutes a major step towards solving the conflict of actual increasing development cost and time due to increasing customer demands on one side, and the need to decrease development cost and time due to increasing competition on the other. Particularly challenging for the off-road equipment industry is that its products, working machines, are complex in architecture. Tightly coupled, non-linear sub-systems of different technical domains make prediction and optimisation of the complete system’s dynamic behaviour difficult.

Furthermore, in working machines the human operator is essential for the performance of the total system. Properties such as productivity, fuel efficiency, and operability are all not only dependent on inherent machine properties and working place conditions, but also on how the operator uses the machine. This is an aspect that is traditionally neglected in dynamic simulations, because the modelling needs to be extended beyond the technical system.

The research presented in this thesis focuses on wheel loaders, which are representative for working machines. The technical system and the influence of the human operator is analysed, and so-called short loading cycles are described in depth. Two approaches to rule-based simulation models of a wheel loader operator are presented and used in simulations. Both operator models control the machine model by means of engine throttle, lift and tilt lever, steering wheel, and brake only – just as a human operator does. Also, only signals that a human operator can sense are used in the models. It is demonstrated that both operator models are able to adapt to basic variations in workplace setup and machine capability. Thus, a “human element” can be introduced into dynamic simulation of working machines, giving more relevant answers with respect to operator-influenced complete-machine properties such as productivity, fuel efficiency, and operability already in the concept phase of the product development process.

Place, publisher, year, edition, pages
Institutionen för konstruktions- och produktionsteknik , 2005. , 45 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1189
Keyword [en]
dynamic simulation, construction equipment, discrete simulation, continuous simulation, operator model, driver model, integrated product development
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-4092ISBN: 91-85457-14-0 (print)OAI: oai:DiVA.org:liu-4092DiVA: diva2:20519
Presentation
2005-09-16, C3, C-huset, Campus Valla, Linköping, 13:15 (English)
Opponent
Supervisors
Note
ISRN/Report code: LiU-Tek-Lic 2005:44Available from: 2005-09-26 Created: 2005-09-26
List of papers
1. Using Dynamic Simulation in the Development of Construction Machinery
Open this publication in new window or tab >>Using Dynamic Simulation in the Development of Construction Machinery
2003 (English)In: Proceedings from the Eighth Scandinavian International Conference on Fluid Power, Tampere, Finland, Vol. 1, May 7–9, 2003, 651-667 p.Conference paper, Published paper (Other academic)
Abstract [en]

As in the car industry for quite some time, dynamic simulation of complete vehicles is being practiced more and more in the development of off-road machinery. However, specific questions arise due not only to company structure and size, but especially to the type of product. Tightly coupled, non-linear subsystems of different domains make prediction and optimisation of the complete system's dynamic behaviour a challenge. Furthermore, the demand for versatile machines leads to sometimes contradictory target requirements and can turn the design process into a hunt for the least painful compromise. This can be avoided by profound system knowledge, assisted by simulation-driven product development. This paper gives an overview of joint research into this issue by Volvo Wheel Loaders and Linkoping University on that matter, lists the results of a related literature review and introduces the term "operateability". Rather than giving detailed answers, the problem space for ongoing and future research is examined and possible solutions are sketched.

Keyword
simulation, complex systems, integrated product development
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13368 (URN)
Conference
The Eighth Scandinavian International Conference on Fluid Power, May 7-9, Tampere, Finland
Available from: 2005-09-26 Created: 2005-09-26 Last updated: 2011-09-06Bibliographically approved
2. Dynamic Simulation of Construction Machinery: Towards an Operator Model
Open this publication in new window or tab >>Dynamic Simulation of Construction Machinery: Towards an Operator Model
2005 (English)In: Proceedings from the IFPE 2005 Technical Conference, 2005, 429-438 p.Conference paper, Published paper (Other academic)
Abstract [en]

In dynamic simulation of complete wheel loaders, one interesting aspect, specific for the working task, is the momentary power distribution between drive train and hydraulics, which is balanced by the operator. This paper presents the initial results to a simulation model of a human operator. Rather than letting the operator model follow a predefined path with control inputs at given points, it follows a collection of general rules that together describe the machine's working cycle in a generic way. The advantage of this is that the working task description and the operator model itself are independent of the machine's technical parameters. Complete sub-system characteristics can thus be changed without compromising the relevance and validity of the simulation. Ultimately, this can be used to assess a machine's total performance, fuel efficiency and operability already in the concept phase of the product development process.

Keyword
Simulation, construction machinery
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13369 (URN)
Conference
International Fluid Power Exhibition 2005 Technical Conference, March 16-18, Las Vegas, USA
Available from: 2005-09-26 Created: 2005-09-26 Last updated: 2011-09-06Bibliographically approved
3. An Event-driven Operator Model for Dynamic Simulation of Construction Machinery
Open this publication in new window or tab >>An Event-driven Operator Model for Dynamic Simulation of Construction Machinery
2005 (English)In: Proceedings form the Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, 2005Conference paper, Published paper (Other academic)
Abstract [en]

Prediction and optimisation of a wheel loader's dynamic behaviour is a challenge due to tightly coupled, non-linear subsystems of different technical domains. Furthermore, a simulation regarding performance, efficiency, and operability cannot be limited to the machine itself, but has to include operator, environment, and work task. This paper presents some results of our approach to an event-driven simulation model of a human operator. Describing the task and the operator model independently of the machine's technical parameters, gives the possibility to change whole sub-system characteristics without compromising the relevance and validity of the simulation.

Keyword
Discrete simulation, continuous simulation, complex systems, operator model, driver model
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13370 (URN)
Conference
The Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, June 1–3
Available from: 2005-09-26 Created: 2005-09-26 Last updated: 2011-09-06Bibliographically approved
4. Anläggningsmaskiner: Hydrauliksystem i multidomäna miljöer
Open this publication in new window or tab >>Anläggningsmaskiner: Hydrauliksystem i multidomäna miljöer
2003 (English)Conference paper, Published paper (Other academic)
Abstract [sv]

I hjullastare och liknande maskiner konkurrerar arbetshydrauliken och drivlinan om dieselmotorns vridmoment. Balansen mellan dessa tre  system präglas av en hög dynamik, vilket är en avgörande skillnad mot vad som är fallet i person- och lastbilar. Bedömning av hur väl denna balans kan upprätthållas och kontrolleras är huvudpunkten i förarens subjektiva bedömning av en maskins körbarhet.

I artikeln diskuteras möjligheter till en objektiv kvantifiering av körbarhet. En mätmetod presenteras samt nya sätt att visualisera denna så viktiga balans mellan maskinens delsystem.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2003
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13371 (URN)
Conference
Hydraulikdagar 2003, Linköping, Sweden, June 3–4
Available from: 2009-12-10 Created: 2009-02-11 Last updated: 2011-08-31Bibliographically approved

Open Access in DiVA

fulltext(1755 kB)5538 downloads
File information
File name FULLTEXT01.pdfFile size 1755 kBChecksum MD5
7924cd36f43dc868a7b1e313c8c5516f5ace58c381b646e7c08f02f411382e7c9b2c5db8
Type fulltextMimetype application/pdf

Authority records BETA

Filla, Reno

Search in DiVA

By author/editor
Filla, Reno
By organisation
Fluid and Mechanical Engineering Systems The Institute of Technology
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 5538 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 2282 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf