Sökning: "first natural frequency"

Visar resultat 21 - 25 av 71 uppsatser innehållade orden first natural frequency.

  1. 21. EXPERIMENTAL CHARACTERIZATION AND COMPUTATIONAL DYNAMIC MODELLING OF A VIOLIN Analysing the effects of creep and string tension

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Byggnadsmekanik; Lunds universitet/Institutionen för byggvetenskaper

    Författare :Joel Värelä; Erik Tunlid; [2020]
    Nyckelord :Violin; experimental modal analysis; modal analysis; EMA; finite element method; FEM; FE; wood; Technology and Engineering;

    Sammanfattning : During the 17th and early 18th century Antonio Stradivari built around 900 violins, that still today are considered some of the best instruments ever created. The theories of how it was possible for a luthier active 300 years ago to create instruments of this quality are many, including unique wood properties and secret building techniques. LÄS MER

  3. 22. Extracting Customer Sentiments from Email Support Tickets : A case for email support ticket prioritisation

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för datavetenskap

    Författare :Albert Fiati-Kumasenu; [2019]
    Nyckelord :Machine Learning; Natural Language Processing; Sentiment Analysis; Cluster Ensemble; VADER; Customer support;

    Sammanfattning : Background Daily, companies generate enormous amounts of customer support tickets which are grouped and placed in specialised queues, based on some characteristics, from where they are resolved by the customer support personnel (CSP) on a first-in-first-out basis. Given that these tickets require different levels of urgency, a logical next step to improving the effectiveness of the CSPs is to prioritise the tickets based on business policies. LÄS MER

  4. 23. Efficacy of practical stump treatment in Latvia

    Master-uppsats, SLU/Southern Swedish Forest Research Centre

    Författare :Uvis Skola; [2019]
    Nyckelord :Norway spruce Picea abies ; Heterobasidion; Phlebiopsis gigantea; Rotstop; urea; covered stumps;

    Sammanfattning : Root and butt rot caused by Heterobasidion spp. result in severe economic losses in Norway spruce forests of the northern hemisphere. Stump treatment using biological or chemical control agents are amongst the most effective solutions of limiting introduction of Heterobasidion spp. after tree felling. LÄS MER

  5. 24. Vibrationer och engesvängningar i Alfdex separator

    M1-uppsats, Högskolan i Halmstad/Akademin för ekonomi, teknik och naturvetenskap

    Författare :Matilda Adolfsson; [2019]
    Nyckelord :vibrations;

    Sammanfattning : The purpose of this thesis is to create a greater understanding of what happens inAlfdex’s separator in terms of natural frequencies, also called resonances. Try in asystematic way to find out where the problem is and produce a possible solutionto the problem. LÄS MER

  7. 25. State- and Parameter Estimation for Spacecraft with Flexible Appendages using Unscented Kalman Filters

    Master-uppsats, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Andrea Mosquera Alonso; [2019]
    Nyckelord :Estimation; flexibility; flexible spacecraft; spacecraft; kalman filter; unscented Kalman filter; spacecraft dynamics; flexible dynamics;

    Sammanfattning : The problem of system identification for dynamic effects on spacecraft has become increasingly relevant with the surge of agile spacecraft, which must perform large amplitude maneuvers at high rates. Precise knowledge of the state of the spacecraft, as well as of the parameters characterizing its motion, is vital for the design of control algorithms enabling stabilization and pointing accuracy. LÄS MER