Sökning: "viscous damping"

Visar resultat 6 - 10 av 15 uppsatser innehållade orden viscous damping.

1. 6. Spacecraft dynamic analysis and correlation with test results : Shock environment analysis of LISA Pathfinder at VESTA test bed

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :Beata Iwona Kunicka; [2017]
   Nyckelord :FEA FEM; finite element analysis; finite element method; mechanical analysis; structural analysis; dynamic analysis; computational dynamic analysis of structures; shock analysis; shock environment; shock test; shock test campaign; spacecraft dynamic analysis; MSC Nastran; MSC Patran; Dynaworks; Shock Response Spectrum; SRS; space engineering; space science and technology; mechanical engineering; structural engineering; analysis optimisation; analysis parametrisation; mechanical wave propagation; shock propagation; damping; hysteretic damping; viscous damping; structural damping;

   Sammanfattning : The particular study case in this thesis is the shock test performed on the LISA Pathfinder satellite conducted in a laboratory environment on a dedicated test bed: Vega Shock Test Apparatus (VESTA). This test is considered fully representative to study shock levels produced by fairing jettisoning event at Vega Launcher Vehicle, which induces high shock loads towards the satellite. LÄS MER

3. 7. Dynamic Soil-structure Interaction of Portal Frame Bridge Walls for High-speed Railways

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

   Författare :Henrik Malm; [2016]
   Nyckelord :SSI; Soil-structure interaction; Structural dynamics; High-speed railway bridges; Impedance; Receptance; Finite element method; Portal frame bridge; Technology and Engineering;

   Sammanfattning : In Sweden, high-speed railways is a subject for public debate. The first stage of a high-speed train network, Ostlänken between Stockholm and Linköping, is under investigation, and is planned to be trafficked in 2028. The high-speed railway is intended to hold traffic with speeds up to 320 km/h. LÄS MER

4. 8. Establishment of an open 3D steam turbine flutter test case

   Master-uppsats, KTH/Energiteknik

   Författare :Di Qi; [2016]
   Nyckelord :;

   Sammanfattning : An open three-dimensional (3D) flutter test case for steam turbines is presented. Unlike previous research on turbine flutter, the geometry is an open resource and is from a test case originally presented by Durham University. LÄS MER

5. 9. Influence of the Non-linear Effects in the Design of Viscous Dampers for Bridge Cables

   Master-uppsats, KTH/Byggvetenskap; KTH/Skolan för arkitektur och samhällsbyggnad (ABE)

   Författare :Yalda Acar; Pontus Jingstål; [2014]
   Nyckelord :Bridge cables; external viscous damper; half-power bandwidth method; loss factor; non-linear vibration; Brokabel; externa viskösa dämpare; half-power bandwidt metoden; förlustfaktor; icke-linjär vibrationer;

   Sammanfattning : In this master thesis the performance of external viscous dampers attached to cables in cable-stayed bridges have been studied. A comparison has been performed between a linear and a non-linear cable model. The comparison was carried out for two bridge cables, one from the Dubrovnik Bridge and the other from the Normandie Bridge. LÄS MER

7. 10. Experimental Characterization of Fixtures Design: A comprehensive study on vibration minimization technique by using viscoelastic materials

   Master-uppsats, KTH/Industriell produktion

   Författare :Md Zamiul Mottasim; [2014]
   Nyckelord :;

   Sammanfattning : Damping is a phenomenon which is obviously related with dissipation of vibration energy under relative motion in a mechanical system. Without changing excitation force in many cases vibration is reduced only by changing mass or stiffness of the system just with altering the resonance frequencies. LÄS MER