Aging Mechanisms and Control. Symposium Part A - Developments in Computational Aero- and Hydro-Acoustics. Symposium Part B - Monitoring and Management of Gas Turbine Fleets for Extended Life and Reduced Costs (Les mecanismes vieillissants et le controle) (Symposium Partie A - Developpements dans le domaine de l'aeroacoustique et I'hydroacoustique numeriques) (Symposium Partie B - Le suivi et la gestion des turbomoteurs en vue du prolongement de l)

摘要

Part A: The acoustic characteristics of air and sea vehicles are of increasing importance for war-time as well as peace-time operations. The meeting treated (the potential)of and results obtained with computational aero- and hydro-acoustics. It is a relatively new and rapidly expanding technical discipline with a large potential for (more) accurate prediction of the acoustic characteristics of air and sea vehicles. Examples are: Acoustic signatures. Acoustic fatigue loads and their consequences for the structural integrity. Effects of inboard noise levels and the near-field acoustic environment including low frequency noise on the effective and efficient operation of the vehicle and its systems (human factors). Community noise of air vehicles during peace-time operation. Papers were presented on the following topics. Propulsion & power noise: propellers, fans, jets, power systems. Fluid flow noise: shear layers and vortex shedding/interaction, cavities. Noise propagation. Structural response and acoustic loads suppression. Part B: Financial constraints make it imperative to retain weapon systems for loner periods than originally planned and to operate them in ways not envisioned by the designers. Therefore technologies that extend the useful lives of weapon systems and their components are needed. Twenty-four papers from seven NATO nations and one allied nation (Australia) were presented threating the Monitoring and Management of Gas Turbine Fleets for Extended Life and Reduced Costs. Papers were presented in for major categories: Maintenance and logistics practices, General design practices, Usage data and mission analysis, and Life determination methodologies. These categories provided material of interest to, respectively, the fleet manager, the equipment designer, the fleet operators, and the technical specialists responsible for fundamental technologies. A consensus view emerged that full fleet monitoring is optimal for understanding fleet life.