Sökning: "active experiments"
Visar resultat 1 - 5 av 587 avhandlingar innehållade orden active experiments.
1. Active Control of Noise in Ventilation Systems : Analysis and Experiments
Sammanfattning : In many kinds of buildings, the ventilation system constitute a well known source of broadband noise. Traditionally, duct born noise is attenuated using passive resistive silencers which produce a high level of attenuation over a broad frequency range. However, they tend to become large and bulky if designed for low frequency attenuation. LÄS MER
2. Active Flow Control for Reducing Drag on Trucks: from Concept to Full Scale Testing
Sammanfattning : There is no doubt that road vehicle transportation is needed to improve efficiency, to reduce power consumption and to contribute to a sustainable mobility. Aerodynamics plays a crucial role in this, and its optimization can have a significant impact on fuel efficiency. LÄS MER
3. Drag Reduction by means of Active Flow Control Applied on a Generic Truck A-pillar: a Numerical and Experimental Study
Sammanfattning : The overall goal of this thesis is to isolate and control the flow mechanism characterizing the flow separation occurring at the A-pillar of a truck. The study aims to gain knowledge of the flow physics of the separation mechanism, and to eventually suppress the afore mentioned separation by means of an Active Flow Control. LÄS MER
4. Active Stabilization of Thermoacoustic Oscillation
Sammanfattning : Combustion processes serve as important sources of energy for both power generation and for transport, ranging from large scale power stations to micro turbines and aeroplane engines. Lean premixed combustion offers a potential to reduce the emission levels, but suffers from instability problems which can be overcome by the use of active control. LÄS MER
5. Aeroelastic Concepts for Flexible Wing Structures
Sammanfattning : This thesis summarizes investigations performed within design, analysis and experimental evaluation of flexible aircraft structures. Not only the problems, but rather the opportunities related to aeroelasticity are discussed. LÄS MER