Sökning: "aircraft structures"

Visar resultat 16 - 20 av 61 avhandlingar innehållade orden aircraft structures.

1. 16. Impact Loading of Composite and Sandwich Structures

   Författare :Sohrab Kazemahvazi; Dan Zenkert; Guruswami Ravichandran; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid mechanics; Strömningsmekanik;

   Sammanfattning : Low weight is one of the most important factors in the design process of high speed naval ships, road vehicles and aircrafts. Lower structural weight enables the possibility of down-sizing the propulsion system and thus decrease manufacturing and operating costs as well as reducing the environmental impact. LÄS MER

3. 17. Dynamic analyses of structures with applied rubber

   Författare :Magnus Alvelid; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Viscoelasticity; Series expansion; Finite; Fractional calculus; Optimization;

   Sammanfattning : The aim with the present thesis has been to develop efficient, practical and accuratemethods in order to model rubber in dynamic analyses, with emphasis on passive constrainedlayer damping materials. A fractional order viscoelastic constitutive model ismapped onto experimental data from a measurement standard using a vibrating beamtechnique. LÄS MER

4. 18. Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods

   Författare :Sven Johansson; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active control of sound; active noise control; anc; actuator individual normalized filtered-x lms; filtered-x lms algorithm; newton algorithm; complex lms; multireference algorithm; leaky lms; control effort weighting; feedforward control; feedback contro;

   Sammanfattning : In the last decade acoustic noise has become more and more regarded as a problem. In cars, boats, trains and aircraft, low-frequency noise reduces comfort. Lightweight materials and more powerful engines are used in high-speed vehicles, resulting in a general increase in interior noise levels. LÄS MER

5. 19. Multimethod aerodynamic research of engine-realistic turbine rear structures

   Författare :Valentin Vikhorev; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; particle image velocimetry; vane lean; pressure taps; enginerealistic; engine-mount recess; European Union EU ; hot-wire anemometry; outlet guide vanes; oil-film visualization; multi-hole probe; turbine exhaust case; bump; turbine rear frame; computational fluid dynamics.; Clean Sky 2; experimental multimethod approach; Horizon 2020; EATEEM; turbine rear structure; low-pressure turbine;

   Sammanfattning : Despite the significant advancements in aircraft engine technology over the past years, the aerodynamics of engine-realistic turbine rear structures (TRS) remain largely unexplored. The TRS, a structural and aerodynamic component situated downstream of the low-pressure turbine (LPT), plays a pivotal role in engine aerodynamic performance, deswirling the LPT flow to maximize the engine thrust. LÄS MER

7. 20. Design For Manufacturing and Producibility in Fabricated Aerospace Structures

   Författare :Julia Madrid; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DFM; Producibility; Process Capability Data; Welding.; Variation Management;

   Sammanfattning : Aircraft component suppliers must adopt new design strategies in order to absorb market growth and become more competitive at the same time as they satisfy environmental demands. To deal with this situation, weight reduction has been the key to success and have made jet engines more fuel efficient. LÄS MER