Sökning: "Operational modal analysis"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden Operational modal analysis.

  1. 1. Reliability-Based Sensitivity Analysis of the Dynamic Response of Railway Bridges

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Hasan Al-Zubaidi; [2022]
    Nyckelord :Railway bridges; High-speed trains; Simply supported beam; Global sensitivity analysis; Uncertainty quantification; Reliability; Ballast instability; Running safety; Passenger comfort;

    Sammanfattning : In response to the planned increase in operational speeds and axle loads of passengertrains that may lead to resonance-induced excessive vibrations in railway bridges,recent studies examined the reliability of bridges concerning train running safety andpassenger comfort limit states. In this respect, valuable information regarding theimportance of input variables can be obtained by conducting Sensitivity Analysis (SA). LÄS MER

  3. 2. Operational modal analysis and finite element modeling of a low-rise timber building

    Master-uppsats, Linnéuniversitetet/Institutionen för byggteknik (BY)

    Författare :Viktor Petersson; Andreas Svanberg; [2021]
    Nyckelord :Timber structure; Dynamic behavior; Operational modal analysis; FE-modeling; Mode shape; Natural frequency.; Träbyggnad; Dynamiskt beteende; Operational modal analysis; FE-modellering; Egenmod; Egenfrekvens.;

    Sammanfattning : Timber is a building material that is becoming more common and of interest for use in high-rise buildings. One of the reasons is that timber requires less energy input for the manufacturing process of the material compared to non-wood based materials. LÄS MER

  4. 3. Experimental Procedures for Operational Modal Analysis of a Power Pack on a Drill Rig

    Master-uppsats, Linköpings universitet/Mekanik och hållfasthetslära

    Författare :Oscar Nilsson; [2017]
    Nyckelord :Operational modal analysis; OMA; engine sweep; modal identication; harmonic scaling;

    Sammanfattning : All structures have modal properties such as natural frequencies and damping. In engineeringit is often of interest to estimate these modal properties for certain structures, to be used whenmodelling for example fatigue. This is done by computing them from finite element models, by using experimental measurements or both. LÄS MER

  5. 4. Evaluate Operational Modal Analysis and Compare the Result to Visualized Mode Shapes

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för maskinteknik

    Författare :Baiyi Song; [2017]
    Nyckelord :Operational Modal Analysis; FDD; SSI; Experimental Modal Analysis; Noise and Vibration Test;

    Sammanfattning : The prototypes vibration test carried out for obtaining reliable information concerning machine’s dynamic properties in development process. Analysis results should be able to correlate with FE model to determine if some underlying assumptions (material properties & boundary conditions) were correct. LÄS MER

  7. 5. Self-Leveling pedestal for a movable Industrial Robot

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Roshan Arun N.S; [2016]
    Nyckelord :;

    Sammanfattning : ABBs kollaborativa robot YUMI, är en industrirobot med sju frihetsgrader. Den har två armar, vilka är avsedda att samverka med människor i arbete. Roboten var ursprungligen avsedd att monteras på ett bord, men olika tillämpningar och krav för förflyttning av sådana samarbetsrobotar motiverade en ny rörlig piedestal. LÄS MER