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  • 1. Besselmann, Thomas
    et al.
    Rostalski, Philipp
    Baric, Miroslav
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Morari, Manfred
    A Benchmark on Hybrid Control of a Mechanical System with Backlash2007Report (Other academic)
  • 2.
    Dahlberg, Christopher
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Pehrsson, David
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Testsystem för utredning av integrerad styrning för RC-helikopter2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    This report is about the creation of a test system for development of a control system for a off the shelf RC-helicopter, which can be bought for about two thousand SEK. The test system consists of both electronics for controlling the helicopter and mechanical constrainer. The constrainer is used for mounting the helicopter so that it won´t crash.A circuit board including processor and sensors was manufactured. This was used for doing test of the different control algorithms. In this way were we able to analyze the quality of the sensors chosen, and what other sensors that could contribute to the control of the system.Basic helicopter control have been studied and presented in the report. Also different kinds of regulation algorithm were presented. These have also been implemented and tested in the test system.Experiments were made to identify how signals in the radio controller were mixed and translated before they were sent to the receiver, to be used to control the helicopter. This could later be used to translate the control signal from the regulators.Demonstrations, with the help of the test system, revealed the pros and cons of the different sensors and other hardware. Different regulation techniques were also tested and analyzed.

  • 3. Ekvall, Jan
    et al.
    Funkquist, Jonas
    Lagerberg, Adam
    Chalmers.
    A Program Package for Modelling and Simulation of Distributed Parameter Processes1994In: 36'th Simulation Conference (SIMS '94) - Applied Simulation in Industry: Stockholm, Sweden, 1994, 1994Conference paper (Refereed)
  • 4.
    Gustafsson, Thomas
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Experiences from a Multi-Cultural Design, Build, Test Project2009In: CDIO Conference, 2009Conference paper (Refereed)
  • 5.
    Hansbo, Peter
    et al.
    Jönköping University, School of Engineering, JTH. Research area Product Development - Simulation and Optimization. Jönköping University, School of Engineering, JTH, Product Development.
    Larson, Mats G.
    Department of Mathematics and Mathematical Statistics, Umeå University, Sweden.
    Zahedi, Sara
    Department of Mathematics, KTH Royal Institute of Technology, Sweden.
    A cut finite element method for coupled bulk-surface problems on time-dependent domains2016In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 307, p. 96-116Article in journal (Refereed)
    Abstract [en]

    In this contribution we present a new computational method for coupled bulk-surface problems on time-dependent domains. The method is based on a space–time formulation using discontinuous piecewise linear elements in time and continuous piecewise linear elements in space on a fixed background mesh. The domain is represented using a piecewise linear level set function on the background mesh and a cut finite element method is used to discretize the bulk and surface problems. In the cut finite element method the bilinear forms associated with the weak formulation of the problem are directly evaluated on the bulk domain and the surface defined by the level set, essentially using the restrictions of the piecewise linear functions to the computational domain. In addition a stabilization term is added to stabilize convection as well as the resulting algebraic system that is solved in each time step. We show in numerical examples that the resulting method is accurate and stable and results in well conditioned algebraic systems independent of the position of the interface relative to the background mesh.

  • 6.
    Hollander, Johan
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    RCC-Jordfelsskydd, mätmodul för övertonsanalys2009Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The majority of all power cuts that affects individuals and communities are caused by earth faults on the power transmission lines at 10kV and 20kV level [1]. If these power cuts could be eliminated, less disturbances and interrupts would lead to large amounts of money savings.

    Swedish Neutral has developed such a protection system. When an earth fault occurs power is injected into the neutral point of the transformer. The RCC (Residual Current Compensation) protection calculates a compensation current exactly 180 degrees out of phase to the fault current. Doing this, the voltage at the fault location becomes very close to zero, without affecting the power transmission.

    The protection system can only compensate automatically for the fundamental frequency (50Hz), and manually for the 3rd, 5th, 7th and 9th harmonics. In most cases, when the harmonics are very small it is not necessary to compensate for them. There are though cases when compensation for the harmonics is necessary.

    This thesis focuses on finding the best method to extract the content of a sampled signal regarding both simplicity and speed. Both amplitude and phase of each harmonic must be calculated. Is the proposed method suitable for the current computer system and how can it easily be implemented.

    Because the fundamental frequency is known and the harmonics are all multiples of the fundamental frequency it makes the task less complex. It is not necessary to use the FFT algorithm. The DFT can be calculated using correlation. Both phase and amplitude can be calculated very precisely with few samples and not so many computer operations.

  • 7. Karlström, Anders
    et al.
    Breitholtz, Claes
    Chalmers.
    Jovik, Inge
    Chalmers.
    Lagerberg, Adam
    Chalmers.
    Control System Design in Distillation Processes and its Dependence of the Original Process Design1992In: First IFAC Workshop on Interactions between Process Design and Process Control: London, UK, 1992, 1992Conference paper (Refereed)
  • 8.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    A Benchmark on Hybrid Control of an Automotive Powertrain with Backlash2007Report (Other academic)
  • 9.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    A literature survey on control of automotive powertrains with backlash2001Report (Other academic)
    Abstract [en]

    In this report, some 40 papers related to backlash control have been studied, and their results have been arranged into a systematic structure, where the main categories are linear, passive and active nonlinear controllers. The emphasis of the study is on control strategies suitable for automotive powertrain applications, but the reported results are not limited to this field. The reported results are based on partly different system structures, depending on how the backlash is incorporated in the system. Different backlash models are also used. Therefore, the report contains a section that describes these differences as well.

  • 10.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Constrained optimal control of automotive powertrains with backlash2004In: Reglermöte: Göteborg, Sweden, 2004, 2004Conference paper (Refereed)
  • 11.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Control and Estimation of Automotive Powertrains with Backlash2004Doctoral thesis, monograph (Other academic)
  • 12.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Gain Scheduling, a Literature Survey1994Report (Other scientific)
  • 13.
    Lagerberg, Adam
    Chalmers, Control engineering laboratory.
    Gain Scheduling Control and its Application to a Chemical Reactor Model1996Licentiate thesis, monograph (Other academic)
  • 14.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Gain Scheduling Control and its Application to a Chemical Reactor Model1996In: Reglermöte: Luleå, Sweden, 1996, 1996Conference paper (Refereed)
  • 15.
    Lagerberg, Adam
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Programmed Simulation Model of a Packed Bed Distillation Column1993Report (Other scientific)
  • 16.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    A Comparison between two Gain Scheduled Controller Structures1995Report (Other scientific)
  • 17.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    A Gain Scheduling Approach to the Control of a CSTR1995Report (Other scientific)
  • 18.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    A study of gain scheduling control applied to an exothermic CSTR1997In: Chemical Engineering & Technology, ISSN 0930-7516, E-ISSN 1521-4125, Vol. 20, no 7, p. 435-444Article in journal (Refereed)
  • 19.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    Gain Scheduling Design using Feedback Gain Bias Compensation1995Report (Other scientific)
  • 20.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    Gain Scheduling Design using Feedback Gain Bias Compensation1995In: Nordic Process Control Workshop VI: Mariehamn, Åland, Finland, 1995, 1995Conference paper (Refereed)
  • 21.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    Gain Scheduling Design using Feedback Gain Bias Compensation1995In: Second Russian-Swedish Control Conference: St. Petersburg, Russia, 1995, 1995Conference paper (Other scientific)
  • 22.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Breitholtz, Claes
    Modelling and Simulation of Distributed Parameter Processes: A Distillation Column Example1995In: Nordic Process Control Workshop V: Lyngby, Denmark, 1995, 1995Conference paper (Other scientific)
  • 23.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Egardt, Bo
    Backlash estimation with application to automotive powertrains2007In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 15, no 3, p. 483-493Article in journal (Refereed)
  • 24.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Egardt, Bo
    Control of Backlash in Automotive Powertrains2002In: Reglermöte: Linköping, Sweden, 2002, 2002, p. 104-107Conference paper (Refereed)
  • 25.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Egardt, Bo
    Estimation of backlash in automotive powertrains - an experimental validation2004In: IFAC Symposium on Advances in Automotive Control: Salerno, IT, 2004, 2004, p. 60-65Conference paper (Refereed)
  • 26.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Egardt, Bo
    Estimation of backlash in automotive powertrains - theory and experiments2003In: Mekatronikmöte: Gothenburg, Sweden, 2003, 2003Conference paper (Refereed)
  • 27.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Egardt, Bo
    Evaluation of Control Strategies for Automotive Powertrains with Backlash2002In: 6th International Symposium on Advanced Vehicle Control: Hiroshima, Japan, 2002, 2002, p. 517-522Conference paper (Refereed)
    Abstract [en]

    Backlash is the source of an uncomfortable acceleration phenomenon, which in the automotive industry is called “shunt and shuffle”. Until recently, only simple controllers have been used to reduce the discomfort, and the tuning of these is made quite subjectively. A number of approaches to control of systems with backlash are reported in the literature, but very few are directed towards control of automotive powertrains. This paper evaluates four different controllers for powertrains with backlash, by means of simulation. The results show that active nonlinear controllers have a potential for improved backlash control. However, the robustness of these controllers needs further investigation.

  • 28.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Egardt, Bo
    Model Predictive Control of Automotive Powertrains with Backlash2005In: 16th IFAC World Congress: Prague, Czech Republic, 2005, 2005Conference paper (Refereed)
  • 29.
    Lagerberg, Adam
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Gimbergsson, Ulf
    Innings, Fredrik
    Reglering av mjölkblandningsutrustning för Tetra Pak2000In: Reglermöte: Uppsala, Sweden, 2000, 2000Conference paper (Other scientific)
  • 30.
    Nilsson, Örjan
    Jönköping University, School of Engineering, JTH, Physics.
    Elektrisk mätteknik: Kompendium för ingenjörsutbildning1992Other (Other (popular scientific, debate etc.))
1 - 30 of 30
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