Search for dissertations about: "complex lms"

Showing result 1 - 5 of 9 swedish dissertations containing the words complex lms.

2. 1. Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods

   Author : Sven Johansson; []
   Keywords : 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;

   Abstract : 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. READ MORE

4. 2. Active Noise Control in Aircraft : Algorithms and Applications

   Author : Sven Johansson; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active noise control; feedforward control; filtere-x lms algorithm; complex lms; multichannel system; multiple reference; aircraft; headset;

   Abstract : The thesis consists of five papers which are divided into three main parts. Parts A and B deal with active noise control in a propeller aircraft application, whereas Part C deals with active noise control in a helicopter application. READ MORE

5. 3. Active Noise Control of Enclosed Sound Fields Optimising the Performance

   Author : Per Sjösten; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; optimising actuator and sensor positions; hybrid controller for anc; fast feedforward algorithm; multiple-error algorithm; active noise control; complex lms; multichannel feedforward algorithm; simulated annealing; mean-field annealing; multiple-reference controller;

   Abstract : Active noise control is the art of reducing a primary unwanted sound field by interference with an actively created secondary sound field. To achieve high reduction, it is crucial to obtain both temporal and spatial matching between the primary and the secondary sound fields. READ MORE

6. 4. Deepening the insights of lignin structure : Lignin-carbohydrate complex (LCC) fractionation and characterization and Kraft lignin amination

   Author : Xueyu Du; Jiebing Li; Mikael Lindström; Jussi Sipilä; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Improvement of kraft pulping delignification efficiency and value-addition of industrial kraft lignin are two attractive topics. The proposal that delignification is deteriorated by the presence of lignin-carbohydrate complex (LCC) is still being debated. READ MORE

7. 5. Growth and Characterization of Amorphous TiAlSiN and HfAlSiN Thin Films

   Author : Hanna Fager; Lars Hultman; Magnus Odén; Martina Lattemann; Linköpings universitet; []
   Keywords : ;

   Abstract : This Thesis explores amorphous transition metal nitrides for cutting tool applications. The aim is to extend the knowledge on amorphous nitride thin lms, to describe the growth process, and to explore ways of characterizing these novel complex materials. READ MORE