Flow-induced vibration and instabilities of structures

点击翻译按钮获取中文摘要

SUMMARY The proposed work involves both fundamental and applied research. It is a combination of research on the dynamics of slender structures interacting with axial flow, by integrating therein more realistic and complex aspects of structure and flow, in which nonlinear aspects of the structures as well as fluid nonlinearity and non-proportional damping are considered. The main goal of this research is to develop a study addressing open problems with ground-breaking innovations in experimental. theoretical, and numerical investigations and to tackle the problems of different areas (e.g. aerospace and aeronautics, nuclear engineering, energy systems, and biomechanics) with a common approach. In particular, the aim is to provide new insights on the subject of nonlinear vibrations and flutter analysis of shell-type structures subjected to compressible and incompressible flow. This research will focus on nonlinear vibrations, fluid-structure interaction, dynamic stability, and active vibration control of such systems undergoing large amplitude vibrations, with applications in aerospace and atomic energy industries and biomechanics. This research is related and is of interest to the power generating industry, offshore mechanics, and the aeronautical industry; some components of the research are the subject of longer-term fundamental investigations. In terms of practical applications, this research is related to heat exchangers, aircraft engines and fuselage dynamics, risers in the oil and gas industry, nuclear reactors and steam generators, valves, piping, acoustic streamers and towed underwater vehicles, solution mining and ocean applications, the respiratory and haemodynamic systems, to name but a few. PROGRESS OF RESEARCH In recent years, our team has studied nonlinear vibrations of shell-type structures by means of advanced numerical techniques and analytical tools, as well as laboratory experiments with the most advanced instrumentation, including laser Doppler vibrometers, the LMS modal analysis system, and a large water tunnel. These studies led to the publication of numerous scientific articles, and the findings of these investigations were used in different sectors of industry and by companies such as IREQ, Spar Aerospace/EMS Technologies, CAE Electronics, the NRC aerospace research institute's structures, materials and propulsion group, Bombardier and PWC. These studies produced enhanced mathematical models and numerical simulation packages validated by experimental investigations (carried out in our advanced fluid-structure interactions laboratory) describing the dynamic behaviour of coupled fluid-structure systems. The results of this work have been presented at international conferences and published in international journals.