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  • 1.
    Ahlin, Kjell
    et al.
    Saven EduTech AB.
    Brandt, Anders
    Saven EduTech AB.
    A smart way to analyze dynamic data2003In: Sound & vibration, ISSN 1541-0161, no February, p. 20-22Article in journal (Other academic)
    Abstract [en]

    In recent years MATLAB® has become a common software tool for general computational mathematics, in universities as well as in industry. In the field of noise and vibration analysis, MATLAB is very common in universities, but perhaps a little less common in the industrial world. In this article some ideas are presented on how MATLAB can be successfully used for analyzing experimental noise and vibration data. Through the introduction of toolboxes in this field, the less experienced user can take advantage of the powerful functionality of MATLAB, either as the main tool or as a complement to the many excellent menu driven systems available on the market. Some of the advantages and disadvantages of using MATLAB versus menu driven systems are also discussed.

  • 2.
    Brandt, Anders
    University of Southern Denmark, Denmark.
    ABRAVIBE - a toolbox for teaching and learning vibration analysis2013In: Sound & vibration, ISSN 1541-0161, no November, p. 12-17Article in journal (Other academic)
    Abstract [en]

    A Matlab® toolbox has been developed as a tool for teaching and learning vibration engineering and vibration analysis. This free, open software will also run under GNU Octave, if an entirely free software platform is wanted, with a few functional limitations. The toolbox functionality includes simulation of mechanical models as well as advanced analysis such as time-series analysis, spectralanalysis, frequency response and correlation function estimation, modal parameter extraction, and rotating machinery analysis (order tracking). In this article, an overview of the functionality is given and recommended use in teaching is discussed.

  • 3.
    Brandt, Anders
    University of Southern Denmark, Denmark.
    Some educational vibration measurement exercises2016In: Sound & vibration, ISSN 1541-0161, no January, p. 12-14Article in journal (Other academic)
    Abstract [en]

    Four exercises are presented to teach experimental vibration measurements: mass calibration; accelerometer mounting; singledegree-of-freedom vibration measurement and analysis; and fullscale experimental modal analysis.

  • 4.
    Brandt, Anders
    et al.
    University of Southern Denmark, Denmark.
    Ahlin, Kjell
    Blekinge Institute of Technology.
    Sampling and time-domain analysis2010In: Sound & vibration, ISSN 1541-0161, no May, p. 13-17Article in journal (Other academic)
    Abstract [en]

    Most noise and vibration measurement and analysis systems are able to record time history signals for subsequent processing. This article deals with some important aspects of recording and processing these data streams in order to maintain analysis integrity.

  • 5.
    Brandt, Anders
    et al.
    Axiom EduTech AB.
    Ahlin, Kjell
    Blekinge Institute of Technology.
    Lagö, Thomas
    Acticut International, USA.
    Noise and vibration measurement system basics2006In: Sound & vibration, ISSN 1541-0161, no April, p. 9-10Article in journal (Other academic)
  • 6.
    Brandt, Anders
    et al.
    Axiom EduTech AB.
    Lagö, Thomas
    Axiom EduTech Inc, USA.
    Ahlin, Kjell
    Blekinge Institute of Technology.
    Tuma, Jiri
    Ostrava-Poruba, Czech Republic.
    Main principles and limitations of current order tracking methods2005In: Sound & vibration, ISSN 1541-0161, no March, p. 19-22Article in journal (Other academic)
    Abstract [en]

    Order tracking is a widely used tool for analysis of vibrations generated in vehicle drivetrain components, since many vibrations are related to engine RPMs. In recent years, offline order tracking has become suitable due to enhanced computer speeds. Many methods, some patented, for both online and offline order tracking have been presented over the years. This article reviews some basic ideas behind current methods and compares their main advantages and limitations. Some basic time-frequency concepts and time window effects are reviewed. Questions on suitable tachometers and their number of pulses per revolution are also addressed. The possibility of processing RPM dependent data without tachometers is also discussed.

  • 7.
    Brandt, Anders
    et al.
    University of Southern Denmark, Denmark.
    Sturesson, Per-Olof
    Volvo Car Corp., Sweden.
    Ristinmaa, Matti
    Lund University.
    Test analysis verification exercise using open software2014In: Sound & vibration, ISSN 1541-0161, no June, p. 13-16Article in journal (Other academic)
    Abstract [en]

    Teaching the topic of structural dynamics in any engineering field is a true challenge due to the wide span of the underlying subjects like mathematics, mechanics (both rigid-body and continuum mechanics), numerical analysis, random data analysis and physical understanding. In this article we present a pedagogical example of using experimental modal analysis to verify and calibrate a finite-element model using free, open-source software.

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