Search for dissertations about: "orifice"

Showing result 21 - 25 of 53 swedish dissertations containing the word orifice.

2. 21. IC-engine intake noise predictions based on linear acoustics

   Author : Magnus Knutsson; Mats Åbom; Antonio Torregrosa; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Akustik;

   Abstract : Shorter product development cycles, densely packed engine compartments and intensified noise legislation increase the need for accurate predictions of IC-engine air intake noise at early stages. The urgent focus on the increasing CO2 emissions and the efficiency of IC-engines, as well as new techniques such as homogeneous charge compression ignition (HCCI) might worsen the noise situation. READ MORE

4. 22. Mobile Working Hydraulic System Dynamics

   Author : Mikael Axin; Petter Krus; Marcus Geimer; Linköpings universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : This thesis deals with innovative working hydraulic systems for mobile machines. Flow control systems are studied as an alternative to load sensing. The fundamental difference is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. READ MORE

5. 23. On modelling and simulation of the human cardiovascular system : with special reference to aortic coarctation and mitral regurgitation

   Author : Matts Karlsson; Linköpings universitet; []
   Keywords : ;

   Abstract : In this thesis the method of identification has been proposed for interpreting data obatined from pressure measurement on patients with aortic coarctation. In order to investigate its charcteristics and applicability the algortithm for identification was initially tested using a simple model of the human cardiovascular system. READ MORE

6. 24. Acoustic characterization of orifices and perforated liners with flow and high-level acoustic excitation

   Author : Lin Zhou; Hans Bodén; Wim De Roeck; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bias Flow; Grazing Flow; Nonlinear Acoustics; Acoustic Impedance; Impedance Eduction; Single Mode Straightforward Method; Uncertainty Analysis; LEE; LNSE; Järnvägsgruppen - Ljud och vibrationer; Järnvägsgruppen - Ljud och vibrationer;

   Abstract : This thesis is motivated by the need for noise control in aircraft engine with orifices and perforated liner. The presence of high-level acoustic excitation, different flow situations either bias flow, grazing flow or any combination in the aircraft engine, makes the acoustic behavior complex due to the interaction between sound and flow over the lined wall. READ MORE

7. 25. Lagrangian CFD Modeling of Impinging Diesel Sprays for DI HCCI

   Author : Per Strålin; Hans-Erik Ångström; Christian Kreuger; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HCCI; Diesel; early direct-injection; impinging nozzle; CFD; Lagrangian modeling; collision models; O’Rourke; Engineering mechanics; Teknisk mekanik;

   Abstract : The homogeneous charge compression ignition (HCCI) concept has been acknowledged as a potential combustion concept for engines, due to low NOx and soot emissions and high efficiency, especially at part-load. Early direct-injection (DI) during the compression stroke is an option when Diesel fuel is used in HCCI. READ MORE