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  • 1.
    Möller, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Design, development and implementation of a mechatronic log traceability system2011Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This thesis concerns a mechatronic system, designed and developed for the forest industry, to trace logs from forest to sawmill. The research is a key part of a large research project launched by the EU in 2006 called the Indisputable Key project. Wood waste during harvesting, transportation and refinement is a major concern for the wood industry worldwide. Some raw materials are not suited for specific end products, and acknowledging this late in the wood value chain is cost inefficient. Pinpointing specific raw material suitable for a particular end product could increase quality, reduce waste and environmental impact; to accomplish this, traceability is essential.

    To trace the raw material of a final wood product to its origin, marking and reading of the different specimens must occur at each refining stage in the wood value chain. The traceability chain can be divided into three main stages: forest to sawmill, inside the sawmill, and from sawmill to second manufacturer. The research presented here covers the first part of the wood value chain, namely, forest to sawmill.

    In Scandinavian countries, logs are cut to length in the forest using a harvester machine. To trace logs, a unique identity code needs to be associated with each log at harvesting time in the forest and detected before further processing at the sawmill. Earlier research using RFID transponders as code carriers have been functionally verified but too costly. Although the cost of RFID transponders is declining, alternative methods are considered a necessity. This constitutes the main driver behind this thesis.

    The thesis presents a promising alternative log marking method comprising a harvester saw-integrated log code printer and a sawmill code detection system. An identity code in the form of a standard matrix code is applied via the harvester saw bar during cutting. A prototype has been designed and realized and the results point towards a both time and cost efficient solution. The code detection system, to be placed in one or more locations at the sawmill, is based on vision technology and image processing to detect the applied log codes. Both log code marking and reading systems communicate with an ICT system which maintains the traceability database. A major advantage of the system is that both marking and reading is performed without any time-loss and hence do not disturb the high pace production flow in todays forestry. Also, the item cost of each code mark is very low, compared to e.g.a transponder. The marking technology is patent pending.

    A field test was performed in December 2009 in northern Sweden. A test batch of 320 logs was marked and read. Two code structures (i.e., matrix and barcode) were applied, where 210 barcoded logs were used to demonstrate log traceability between forest and sawmill. This result indicates that this technology has potential. The prototype is not intended for commercial use, but serves merely to demonstrate the potential of the method; further research is needed to improve its functionality.

  • 2.
    Möller, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    End-point controlled 2-DOF manipulator arm2005In: The proceedings of OST, Stockholm, 2005., 2005Conference paper (Other academic)
  • 3.
    Möller, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Log marking methods for tracing logs from the forest to the sawmill2007In: The proceedings of OST, 2007Conference paper (Refereed)
  • 4.
    Möller, Björn
    KTH, Superseded Departments, Machine Design.
    Modular mechatronic mechanism2004Licentiate thesis, comprehensive summary (Other scientific)
  • 5.
    Möller, Björn
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Andersson, Sören
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    Development of a modular mechatronic mechanism test bench2003In: The proceedings of OST, Oulu, Finland, June 2003, 2003Conference paper (Refereed)
  • 6.
    Möller, Björn
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Andersson, Sören
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    The influence of friction in the hydraulic cylinders on the behaviour of a manipulator2006In: The proceedings of NordTrib, 2006Conference paper (Refereed)
    Abstract [en]

    In mobile units such as construction machines that handle high loads, hydraulic cylinders are often used to actuate the manipulators. Such machinery is often manually operated, with each cylinder operating separately. However, the increased use of microcomputers opens up the possibility of computer control of the motions of all types of manipulator. Such control would facilitate the implementation of end-point-controlled hydraulic-driven manipulators. It could also reduce the learning time for operators and prolong the life of machines. However, the nonlinear effects of friction in the hydraulic cylinders may be a problem if they disturb the motion of the manipulator arms. There is thus a need to investigate the influence of friction in hydraulic cylinders on manipulator motion.

    This paper reports on the use of a computer model of a hydraulic-powered manipulator arm to simulate the effects of friction, as represented in several different friction models, on the dynamics of a manipulator. The model used was modular and included two hydraulic cylinders, whose motion was influenced by friction in the cylinders. This model and the work reported in this paper are part of a project to investigate the possibility of implementing end-point control.

    A simulation with realistic data revealed that in general the friction in the hydraulic cylinders has only a minor effect on the motion of the manipulator arms. However, very high friction can have a noticeable effect, particularly if the static friction is much higher than the dynamic friction.

  • 7.
    Möller, Björn
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Andersson, Sören
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    Wikander, Jan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Modularisation of mechatronic mechanisms with dependent degrees of freedom2003In: The preoceedings of ICED August, 2003, Stockholm, Sweden, 2003Conference paper (Refereed)
  • 8.
    Möller, Björn
    et al.
    KTH, Superseded Departments, Machine Design.
    Andersson, Sören
    KTH, Superseded Departments, Machine Design.
    Wikander, Jan
    KTH, Superseded Departments, Machine Design.
    Modularisation of mechatronic mechanisms with dependent degrees of freedom2003In: The proceedings of ICED, Stockholm, Sweden, August 2003, 2003Conference paper (Refereed)
    Abstract [en]

    Modularisation and mechatronic solutions are two prominent trends in modern product development. For some mechatronic systems, modularisation is difficult. Such systems often involve functionally complex products such as robots and vehicles, where the mechanical function of a subsystem is strongly dependent on all the interacting subsystems. This paper addresses one of the problems posed by such systems. In order to illustrate the problem and a possible solution to it, a feasibility study of a modularised mechanism test bench was undertaken using a behaviour control approach. The modelling and simulation tools SimMechanics and Simulink were used to evaluate the behaviour of this mechanism. The results indicate that it is possible to modularise the control of a complex mechanism, even if the degrees of freedom are strongly dependent.

  • 9.
    Möller, Björn
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Wikander, Jan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Hellgren, Mikael
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    A field-tested log traceability system2011In: Forest products journal, ISSN 0015-7473, Vol. 61, no 6, p. 466-472Article, review/survey (Refereed)
    Abstract [en]

    Today, an information gap exists between log measurements performed in the forest and at the sawmill. By applying a code in the forest during harvesting and then reading it at the sawmill, this information gap would vanish. A log applicator, which applies two-dimensional log codes through the saw bar, and a corresponding detection system based on vision technology have been developed. Key features of this technology are the very low cost of each mark and the zero-time-loss characteristic of both marking and detection.

    A field test utilizing this equipment was performed on 210 logs in northern Sweden in December 2009. For logs harvested during real harvesting conditions and automatically detected at the log sorting station of a running sawmill, a detection rate of 40 percent was achieved. A comparison between parameters (length and diameter) measured in the forest and at the sawmill is presented, as are a number of suggested improvements to increase the detection rate substantially.

  • 10.
    Möller, Björn
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Wikander, Jan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Hellgren, Mikael
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Arrangement and method for marking a log end surface2011Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    The invention relates to an arrangement (1) for marking a log end surface (4a) with a marking code during cutting of a log (4) and amethod for marking a log end surface (4a)with a marking code. The arrangement (1) is connected to a saw bar (3) comprising a plurality offluid distributing nozzles(6) in communication with a fluid container (16). The arrangement (1) further comprises acontrol unit (CU) arranged to control the flow of fluid through eachnozzle (6)based on log-related identification code. The invention is characterised in thatthe flow of fluid through eachnozzle (6)is controlled based on the movement of the saw bar (3) relative to the log in a cutting direction.

  • 11.
    Reu, Pedro
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology.
    Svedberg, Gustav
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology.
    Hässler, Lars
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Möller, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
    Svahn Andersson, Helene
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science.
    Gantelius, Jesper
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Protein Science, Nano Biotechnology.
    A 61% lighter cell culture dish to reduce plastic waste2019In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 14, no 4, article id e0216251Article in journal (Refereed)
    Abstract [en]

    Cell culture is a ubiquitous and flexible research method. However, it heavily relies on plastic consumables generating millions of tonnes of plastic waste yearly. Plastic waste is a major and growing global concern. Here we describe a new cell culture dish that offers a culture area equivalent to three petri dishes but that is on average 61% lighter and occupies 67% less volume. Our dish is composed of a lid and three thin containers surrounded by a light outer shell. Cell culture can be performed in each of the containers sequentially. The outer shell provides the appropriate structure for the manipulation of the dish as a whole. The prototype was tested by sequentially growing cells in each of its containers. As a control, sequential cultures in groups of 3 petri dishes were performed. No statistical differences were found between the prototype and the control in terms of cell number, cell viability or cell distribution.

  • 12. Rodgers, L.
    et al.
    Jeunnette, M.
    Biffard, R.
    Möller, Björn
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Mechatronics.
    Wu, E.
    Matthys, K.
    Analyzing the limitations of the rider and electric motorcycle at the pikes peak international hill climb race2019In: SAE technical paper series, ISSN 0148-7191, Vol. 2019-April, no AprilArticle in journal (Refereed)
    Abstract [en]

    This paper describes a post-race analysis of team KOMMIT EVT's electric motorcycle data collected during the 2016 Pikes Peak International Hill Climb (PPIHC). The motorcycle consumed approximately 4 kWh of battery energy with an average and maximum speed of 107 km/h and 149 km/h, respectively. It was the second fastest electric motorcycle with a finishing time of 11:10.480. Data was logged of the motorcycle's speed, acceleration, motor speed, power, currents, voltages, temperatures, throttle position, GPS position, rider's heart rate and the ambient environment (air temperature, pressure and humidity). The data was used to understand the following factors that may have prevented a faster time: physical fitness of the rider, thermal limits of the motor and controller, available battery energy and the sprocket ratio between the motor and rear wheel. Even though the rider's heart rate implied a vigorous exercise intensity level, throttle values indicated that the rider wanted to go faster ∼33% of the time. The motor reached a steady-state temperature that was approximately 30°C below the maximum allowable temperature and thus could have handled more current. By analyzing additional thermal and current data, it was concluded that the motor controller was likely a limiting factor but not the battery capacity since only ∼2/3 of the total available battery energy was consumed. A model that estimates the optimal sprocket ratio was derived and validated; It was determined that using the optimal sprocket ratio of 62/12 would have decreased the finishing time by approximately 2 seconds.

1 - 12 of 12
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