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  • 1.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    A Methodology for Modeling the Influence of Construction Machinery Operators on Productivity and Fuel Consumption2009Ingår i: Proceedings from the Human-Computer Interaction HCI International 2009, San Diego (CA), USA: Digital Human Modeling, Berlin / Heidelberg: Springer , 2009, s. 614-623Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper is concerned with modeling the actions of a human operator of construction machinery and integrating this operator model into a large, complex simulation model of the complete machine and its environment. Because human operators to a large degree affect how the machine is run, adaptive operator models are a necessity when the simulation goal is quantification and optimization of productivity and energy efficiency.

    Interview studies and test series have been performed to determine how professionals operate wheel loaders. Two models using different approaches were realized and integrated into a multi-domain model for dynamic simulation. The results are satisfactory and the methodology is easily usable for other, similar situations.

  • 2.
    Filla, Reno
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Alternative system solutions for wheel loaders and other construction equipment2008Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Within the Volvo Group there exist long-ranging experiences regarding hybrid propulsions systems for heavy commercial vehicles of the brands Volvo Trucks, Renalt Trucks, Mack Trucks, Nissan Diesel and Volvo Bus. For commercial vehicles like these, hybrid technology is to be regarded seriously and a business case is often given. The search for energy efficient solutions goes on also for construction equipment, and hybrids are everyone's topic. Within Volvo Construction Equipment there is a tradition of researching and developing energy efficient solutions, an example of which was the presentation of a first prototype of a hybrid wheel loader in the beginning of 2008. In this paper the wheel loader will be used as an example for other types of construction machinery. Using a systematic design approach, several more principle design solutions can be found. Reduced fuel consumption by 50% while keeping the performance and productivity at the same level is only possible by considering the complete machine as one system using a holistic approach. 

  • 3.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    An Event-driven Operator Model for Dynamic Simulation of Construction Machinery2005Ingår i: Proceedings form the Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, 2005Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 4.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Anläggningsmaskiner: Hydrauliksystem i multidomäna miljöer2003Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 5.
    Filla, Reno
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Fluid och mekanisk systemteknik.
    Effektivare hjullastare: Hybrider?2007Ingår i: Hydraulikdagar 07,2007, Linköping: Linköpings universitet , 2007Konferensbidrag (Övrigt vetenskapligt)
    Abstract [sv]

    Med allt högre bränslepriser och den tilltagande samhällsdebatten om växthusgaser och klimatförändringar förvånar det inte att även företag utanför personbilsbranschen undersöker alternativa systemlösningar för att minska avgasutsläppen och oljeberoendet. Detta föredrag presenterar Volvo CEs satsning på elhybrider med fokus på hjullastare.

  • 6.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan. Volvo Construction Equipment AB, Eskilstuna.
    Hybrid Power Systems for Construction Machinery: Aspects of System Design and Operability of Wheel Loaders2009Ingår i: ASME 2009 International Mechanical Engineering Congress and Exposition: Volume 13: New Developments in Simulation Methods and Software for Engineering Applications; Safety Engineering, Risk Analysis and Reliability Methods; Transportation Systems, The American Society of Mechanical Engineers (ASME) , 2009, Vol. 13, s. 611-620Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper will examine the wheel loader as a system with two parallel energy conversion systems that show a complex interaction with each other and with the power source. Using a systematic design approach, several principle design solutions for hybridization can be found.

    Furthermore, the human operator with his/her control actions needs to be considered as part of the total system. This paper will therefore also connect to results from ongoing and previous research into operator workload and operability.

  • 7.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Operator and Machine Models for Dynamic Simulation of Construction Machinery2005Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    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.

    Delarbeten
    1. Using Dynamic Simulation in the Development of Construction Machinery
    Öppna denna publikation i ny flik eller fönster >>Using Dynamic Simulation in the Development of Construction Machinery
    2003 (Engelska)Ingår i: Proceedings from the Eighth Scandinavian International Conference on Fluid Power, Tampere, Finland, Vol. 1, May 7–9, 2003, s. 651-667Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Nyckelord
    simulation, complex systems, integrated product development
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13368 (URN)
    Konferens
    The Eighth Scandinavian International Conference on Fluid Power, May 7-9, Tampere, Finland
    Tillgänglig från: 2005-09-26 Skapad: 2005-09-26 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
    2. Dynamic Simulation of Construction Machinery: Towards an Operator Model
    Öppna denna publikation i ny flik eller fönster >>Dynamic Simulation of Construction Machinery: Towards an Operator Model
    2005 (Engelska)Ingår i: Proceedings from the IFPE 2005 Technical Conference, 2005, s. 429-438Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Nyckelord
    Simulation, construction machinery
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13369 (URN)
    Konferens
    International Fluid Power Exhibition 2005 Technical Conference, March 16-18, Las Vegas, USA
    Tillgänglig från: 2005-09-26 Skapad: 2005-09-26 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
    3. An Event-driven Operator Model for Dynamic Simulation of Construction Machinery
    Öppna denna publikation i ny flik eller fönster >>An Event-driven Operator Model for Dynamic Simulation of Construction Machinery
    2005 (Engelska)Ingår i: Proceedings form the Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, 2005Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Nyckelord
    Discrete simulation, continuous simulation, complex systems, operator model, driver model
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13370 (URN)
    Konferens
    The Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, June 1–3
    Tillgänglig från: 2005-09-26 Skapad: 2005-09-26 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
    4. Anläggningsmaskiner: Hydrauliksystem i multidomäna miljöer
    Öppna denna publikation i ny flik eller fönster >>Anläggningsmaskiner: Hydrauliksystem i multidomäna miljöer
    2003 (Engelska)Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Ort, förlag, år, upplaga, sidor
    Linköping: Linköping University Electronic Press, 2003
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13371 (URN)
    Konferens
    Hydraulikdagar 2003, Linköping, Sweden, June 3–4
    Tillgänglig från: 2009-12-10 Skapad: 2009-02-11 Senast uppdaterad: 2011-08-31Bibliografiskt granskad
  • 8.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Quantifying Operability of Working Machines2011Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    I arbetsmaskiner spelar föraren en avgörande roll för maskinens prestanda. Såväl produktivitet som energieffektivitet beror inte enbart av maskinens egenskaper och arbetsomgivningen, utan beror också av sättet på vilket föraren manövrerar maskinen. För att främja ett bränslesnålt körsätt ska maskinerna upplevas som harmoniska och det är viktigt att beakta detta vid utvecklingen.

    Det är nödvändigt att kvantifiera maskinharmonin och att ta hänsyn till interaktionen mellan föraren och maskinen i alla steg av ett utvecklingsprojekt. Detta gäller såväl sena faser, när fysiska prototyper redan har tagits fram och utvärderas av professionella provförare, såväl som tidiga faser som konceptutveckling, när endast virtuella prototyper finns tillgängliga.

    Förarens inflytande beaktas traditionellt inte i prestandasimuleringar i konceptfasen, eftersom detta innebär att mer än enbart det tekniska systemet måste modelleras. I den forskningen som presenteras här visas två olika regelbaserade modeller av hjullastarförare. Båda förarmodellerna använder maskinmodellen på samma sätt som en verklig förare använder en verklig maskin. Det visas att båda förarmodellerna kan anpassa sig till förändringar både i arbetsomgivningen och i maskinens egenskaper. I och med detta kan man utöka dynamiska simuleringar av arbetsmaskiner med ”ett mänskligt element”. Detta ger bättre resultat vad gäller produktivitet, energieffektivitet och liknande egenskaper som föraren påverkar i kompletta maskiner.

    Medan man i tidiga faser av produktutvecklingsprocessen traditionellt bortser från förarens inflytande, så är man i senare faser mycket beroende av att professionella provförare testar fysiska prototyper. Den här presenterade forskningen visar hur den traditionella subjektiva förarbedömningen av en maskins körbarhet kan kompletteras med ett mått på förarens ”spakarbete”, som beräknas utifrån en mätning på hur föraren använder sina kontroller för att styra maskinen. Detta mått på ”spakarbete” kan också beräknas utifrån de spaksignaler som genereras av förarmodellerna i en simulering. I och med detta kan en maskins körbarhet undersökas redan under konceptutvecklingen.

    I avhandlingen redovisas också resultaten från en studie som gjorts i syfte att kvantifiera förarens arbetsbelastning genom att mäta psykofysiologiska mått som variationer i hjärtfrekvens och andningsfrekvens. Studien är ett första steg mot att förverkliga en vision av stödfunktioner i arbetsmaskiner vilka anpassar sig efter förarens momentana arbetsbelastning. En sådan metod att mäta förarens arbetsbelastning kan också användas som ett komplement till den traditionella subjektiva förarbedömningen av en maskins körbarhet. Metoden kan inte bara användas vid provning av fysiska prototyper utan också tidigare i produktutvecklingsprocessen vid studier i avancerade körsimulatorer.

    Delarbeten
    1. Using Dynamic Simulation in the Development of Construction Machinery
    Öppna denna publikation i ny flik eller fönster >>Using Dynamic Simulation in the Development of Construction Machinery
    2003 (Engelska)Ingår i: Proceedings from the Eighth Scandinavian International Conference on Fluid Power, Tampere, Finland, Vol. 1, May 7–9, 2003, s. 651-667Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Nyckelord
    simulation, complex systems, integrated product development
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13368 (URN)
    Konferens
    The Eighth Scandinavian International Conference on Fluid Power, May 7-9, Tampere, Finland
    Tillgänglig från: 2005-09-26 Skapad: 2005-09-26 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
    2. Dynamic Simulation of Construction Machinery: Towards an Operator Model
    Öppna denna publikation i ny flik eller fönster >>Dynamic Simulation of Construction Machinery: Towards an Operator Model
    2005 (Engelska)Ingår i: Proceedings from the IFPE 2005 Technical Conference, 2005, s. 429-438Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Nyckelord
    Simulation, construction machinery
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13369 (URN)
    Konferens
    International Fluid Power Exhibition 2005 Technical Conference, March 16-18, Las Vegas, USA
    Tillgänglig från: 2005-09-26 Skapad: 2005-09-26 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
    3. An Event-driven Operator Model for Dynamic Simulation of Construction Machinery
    Öppna denna publikation i ny flik eller fönster >>An Event-driven Operator Model for Dynamic Simulation of Construction Machinery
    2005 (Engelska)Ingår i: Proceedings form the Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, 2005Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    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.

    Nyckelord
    Discrete simulation, continuous simulation, complex systems, operator model, driver model
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-13370 (URN)
    Konferens
    The Ninth Scandinavian International Conference on Fluid Power, Linköping, Sweden, June 1–3
    Tillgänglig från: 2005-09-26 Skapad: 2005-09-26 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
    4. A Methodology for Modeling the Influence of Construction Machinery Operators on Productivity and Fuel Consumption
    Öppna denna publikation i ny flik eller fönster >>A Methodology for Modeling the Influence of Construction Machinery Operators on Productivity and Fuel Consumption
    2009 (Engelska)Ingår i: Proceedings from the Human-Computer Interaction HCI International 2009, San Diego (CA), USA: Digital Human Modeling, Berlin / Heidelberg: Springer , 2009, s. 614-623Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    This paper is concerned with modeling the actions of a human operator of construction machinery and integrating this operator model into a large, complex simulation model of the complete machine and its environment. Because human operators to a large degree affect how the machine is run, adaptive operator models are a necessity when the simulation goal is quantification and optimization of productivity and energy efficiency.

    Interview studies and test series have been performed to determine how professionals operate wheel loaders. Two models using different approaches were realized and integrated into a multi-domain model for dynamic simulation. The results are satisfactory and the methodology is easily usable for other, similar situations.

    Ort, förlag, år, upplaga, sidor
    Berlin / Heidelberg: Springer, 2009
    Serie
    Lecture Notes in Computer Science (LNCS), ISSN 0302-9743, E-ISSN 1611-3349 ; 5620
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-51998 (URN)10.1007/978-3-642-02809-0_65 (DOI)978-3-642-02808-3 (ISBN)
    Konferens
    Human-Computer Interaction HCI International 2009, San Diego (CA), USA, July 19-24
    Tillgänglig från: 2009-11-27 Skapad: 2009-11-27 Senast uppdaterad: 2018-01-25Bibliografiskt granskad
    5. Hybrid Power Systems for Construction Machinery: Aspects of System Design and Operability of Wheel Loaders
    Öppna denna publikation i ny flik eller fönster >>Hybrid Power Systems for Construction Machinery: Aspects of System Design and Operability of Wheel Loaders
    2009 (Engelska)Ingår i: ASME 2009 International Mechanical Engineering Congress and Exposition: Volume 13: New Developments in Simulation Methods and Software for Engineering Applications; Safety Engineering, Risk Analysis and Reliability Methods; Transportation Systems, The American Society of Mechanical Engineers (ASME) , 2009, Vol. 13, s. 611-620Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    This paper will examine the wheel loader as a system with two parallel energy conversion systems that show a complex interaction with each other and with the power source. Using a systematic design approach, several principle design solutions for hybridization can be found.

    Furthermore, the human operator with his/her control actions needs to be considered as part of the total system. This paper will therefore also connect to results from ongoing and previous research into operator workload and operability.

    Ort, förlag, år, upplaga, sidor
    The American Society of Mechanical Engineers (ASME), 2009
    Nationell ämneskategori
    Maskinteknik
    Identifikatorer
    urn:nbn:se:liu:diva-51999 (URN)10.1115/IMECE2009-10458 (DOI)000282197600069 ()978-0-7918-4386-4 (ISBN)
    Konferens
    ASME 2009 International Mechanical Engineering Congress and Exposition (IMECE2009), Lake Buena Vista, Florida, USA, 13-19 November,
    Tillgänglig från: 2009-11-27 Skapad: 2009-11-27 Senast uppdaterad: 2016-05-17Bibliografiskt granskad
    6. Study of a method for assessing operability of working machines in physical and virtual testing
    Öppna denna publikation i ny flik eller fönster >>Study of a method for assessing operability of working machines in physical and virtual testing
    2012 (Engelska)Ingår i: International Journal of Vehicle Systems Modelling and Testing, ISSN 1745-6436, Vol. 7, nr 3, s. 209-234Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    In this study of eighteen wheel loader operators, test-driving a machine in three different traction force settings, we found strong support for the hypothesis that the operator’s control commands can be used to assess the machine’s operability, at least in form of ease of bucket filling.

    The methods chosen to derive the control effort worked well and were computationally efficient.

    Ort, förlag, år, upplaga, sidor
    InderScience Publishers, 2012
    Nyckelord
    Mental workload, machine operability, human–machine interaction, operator modelling, vehicle simulation, virtual testing, working machines, wheel loaders, operators, control commands, control effort, vehicle testin
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-70392 (URN)10.1504/IJVSMT.2012.048939 (DOI)
    Tillgänglig från: 2011-09-06 Skapad: 2011-09-06 Senast uppdaterad: 2012-09-20Bibliografiskt granskad
    7. A Case Study on Quantifying the Workload of Working Machine Operators by Means of Psychophysiological Measurements
    Öppna denna publikation i ny flik eller fönster >>A Case Study on Quantifying the Workload of Working Machine Operators by Means of Psychophysiological Measurements
    (Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    In this study of eighteen wheel loader operators, test-driving a machine in three different traction force settings, we examine if a workload index derived from psychophysiological measurements of heart rate, finger temperature, skin conductance, respiration rate and end-tidal CO2-concentration in exhaled air can be used to assess operator workload in sufficient detail to use it as a complement to traditional subjective evaluations, and also to use such measurements in a workload-adaptive operator assistance system in a longer perspective.

    Nyckelord
    Operator, working machines, mental workload, physical workload, operability, human-machine interaction
    Nationell ämneskategori
    Teknik och teknologier
    Identifikatorer
    urn:nbn:se:liu:diva-70393 (URN)
    Tillgänglig från: 2011-09-06 Skapad: 2011-09-06 Senast uppdaterad: 2011-09-06Bibliografiskt granskad
  • 9.
    Filla, Reno
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Study of a method for assessing operability of working machines in physical and virtual testing2012Ingår i: International Journal of Vehicle Systems Modelling and Testing, ISSN 1745-6436, Vol. 7, nr 3, s. 209-234Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study of eighteen wheel loader operators, test-driving a machine in three different traction force settings, we found strong support for the hypothesis that the operator’s control commands can be used to assess the machine’s operability, at least in form of ease of bucket filling.

    The methods chosen to derive the control effort worked well and were computationally efficient.

  • 10.
    Filla, Reno
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Ericsson, Allan
    Volvo Wheel Loaders AB.
    Palmberg, Jan-Ove
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Dynamic Simulation of Construction Machinery: Towards an Operator Model2005Ingår i: Proceedings from the IFPE 2005 Technical Conference, 2005, s. 429-438Konferensbidrag (Övrigt vetenskapligt)
    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.

  • 11.
    Filla, Reno
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Olsson, Erik M. G.
    Dept. of Public Health and caring Sciences, Uppsala University, Sweden.
    Schéele, Bo H. C. von
    Stress Medicien AB, Bergvik, Sweden.
    Ohlsson, Kjell
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell arbetsvetenskap. Linköpings universitet, Tekniska högskolan.
    A Case Study on Quantifying the Workload of Working Machine Operators by Means of Psychophysiological MeasurementsManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    In this study of eighteen wheel loader operators, test-driving a machine in three different traction force settings, we examine if a workload index derived from psychophysiological measurements of heart rate, finger temperature, skin conductance, respiration rate and end-tidal CO2-concentration in exhaled air can be used to assess operator workload in sufficient detail to use it as a complement to traditional subjective evaluations, and also to use such measurements in a workload-adaptive operator assistance system in a longer perspective.

  • 12.
    Filla, Reno
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Palmberg, Jan-Ove
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Using Dynamic Simulation in the Development of Construction Machinery2003Ingår i: Proceedings from the Eighth Scandinavian International Conference on Fluid Power, Tampere, Finland, Vol. 1, May 7–9, 2003, s. 651-667Konferensbidrag (Övrigt vetenskapligt)
    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.

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