Avancerad sökning

Visar resultat 16 - 20 av 56 avhandlingar som matchar ovanstående sökkriterier.

1. 16. Structure-acoustic analysis; finite element modelling and reduction methods

   Författare :Peter Davidsson; Byggnadsmekanik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mechanical engineering; hydraulics; vacuum technology; vibration and acoustic engineering; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik; low frequency range; building acoustics; lightweight structures; porous materials; modal reduction; substructuring; finite element analysis; structural acoustics; vibroacoustics; Structural dynamics;

   Sammanfattning : This thesis investigates structure-acoustic systems by use of finite element analysis. The systems studied here are limited to those that consist of an enclosed acoustic fluid cavity, which is coupled to a flexible structure and/or a porous sound absorbing material domain. LÄS MER

3. 17. In-vehicle speed adaptation - On the effectiveness of a voluntary system

   Författare :Magnus Hjälmdahl; Trafik och väg; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Road transport technology; Vägtransportteknik; Traffic safety; In-car observations; Long-term effects; Speed; Driver behaviour; ISA; Active Accelerator Pedal;

   Sammanfattning : The overarching aim of this thesis is to study the long term effects of a voluntary speed adaptation system, the Active Accelerator Pedal (AAP), and its effectiveness for different driver types. The papers making up this thesis are based on a study carried out on 284 vehicles and drivers in the Swedish city of Lund from 1999 until 2002. LÄS MER

4. 18. Interpreting budget deficits and productivity fluctuations

   Författare :Jyry Hokkanen; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi; Economics; Nationalekonomi; nationalekonomi; Economics;

   Sammanfattning : This thesis includes four self-contained essays on budget deficits and productivity fluctuations:ESSAY I evaluates the effects of budget deficits on several key macroeconomic variables of the Swedish economy by estimating a vector autoregression model. The main finding is that - apart from a positive transitory real interest rate effect associated with a shock in the deficit - neither actual nor unexpected movements in deficits have any significant explanatory power for the determination of real non-fiscal variables. LÄS MER

5. 19. Tree Models for Design Space Exploration in Aerospace Engineering

   Författare :Siva Krishna Dasari; Abbas Cheddad; Lars Lundberg; Pawel Herman; Blekinge Tekniska Högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : A crucial issue in the design of aircraft components is the evaluation of a larger number of potential design alternatives. This evaluation involves too expensive procedures, consequently, it slows down the search for optimal design samples. LÄS MER

7. 20. Exploring Massively Parallel Models and Architectures for Efficient Computation of Evolutionary Algorithms

   Författare :Sven Eklund; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; distributed population models; evolutionary algorithms; symbolic function regression; genetic programming; linear machine code; Diffusion Model; time series forecasting; FPGA; VHDL;

   Sammanfattning : 'Evolutionary algorithms' is the collective name for a group of relatively new stochastic search algorithms that have several unique and interesting properties. However, as with all search algorithms, evolutionary algorithms also have disadvantages. LÄS MER