Search for dissertations about: "perforated mufflers"

Found 3 swedish dissertations containing the words perforated mufflers.

2. 1. Investigation of perforated mufflers and plates

   Author : Ying Guo; Mast Abom; Ragnar Glav; KTH; []
   Keywords : sound; perforated; micro-perforated; muffler; flow; hole; impedance; model; experiment;

   Abstract :     Mufflers are used in for instance exhaust system of cars or trucks to reduce noise. Perforated pipes are one of the main components of modern mufflers. To study acoustic properties of mufflers with perforated pipe is one of the main targets of this thesis. READ MORE

4. 2. Modelling and Characterization of Perforates in Lined Ducts and Mufflers

   Author : Tamer Elnady; KTH; []
   Keywords : Perforates; Liners; Acoustic impedance; Hot stream liners; Hard splices; Mufflers; Lined ducts; Collocation; Flow duct.;

   Abstract : Increased national and international travel over the lastdecades has caused an increase in the global number ofpassengers using different means of transportation. Greateffort is being directed to improving the noisy environment inthe residential community. READ MORE

5. 3. Investigation and Optimization of the Acoustic Performance of Exhaust Systems

   Author : Sara Elsaadany; Mats Åbom; Ray Kirby; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Exhaust systems; noise; pressure drop; 1D models; perforated mufflers; after treatment devices; optimization;

   Abstract : There is a strong competition among automotive manufacturers to reduce the radiated noise levels. One important source is the engine exhaust where the main noise control strategy is by using efficient mufflers. READ MORE