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Non-contact gas turbine blade vibration measurement from casing pressure and vibration signals – A review(2010) Forbes, Gareth Llewellyn; Randall, Robert BondConference PaperThis paper presents a summary of a recent research program, focusing on a new method of non contact gas turbine blade vibration measurement using casing pressure and vibration signals. Currently the dominant method of non contact measurement of turbine blade vibrations employs the use of a number of proximity probes located around the engine periphery measuring the blade tip (arrival) time (BTT). Despite the increasing ability of this method there still exist some limitations, viz: the requirement of a large number of sensors for each engine stage, difficulties in dealing with multiple excitation frequencies, sensors being located in the gas path, and the inability to directly measure the natural frequency of a given blade. Simulations established with a physics based model along with experimental measurements are presented in this paper, using internal pressure and casing vibration measurements, which have the potential to rectify some of these problems.
(2010) Kanapathipillai, Sangarapillai; Feng, NingshengConference PaperDesign teaching in mechanical engineering has two features which distinguish it from many other teaching areas. First, the majority of students have little or no background in technology and practical design. Second, virtually all design learning comes through the development of conceptual understanding, rather than from the learning of declarative knowledge. The objective of teaching mechanical engineering design is to provide a learning context in which students will achieve a basic level of competence in design. The challenge, then, for design teachers is to ensure that the learning context – the curriculum, teaching methods, and assessment provisions – is appropriate to the development of conceptual understanding of the design process, and through this, achieve the goal of design competence. The most important and yet most difficult teaching goal is to bring the conceptual change in students’ understanding of the fundamental features of the discipline being studied. The focus of this paper is to look at some of the aspects associated with the teaching mechanical engineering design in new environment in which engineering schools are subject to resource constraints. The results indicate that there is a need for a closer look at teaching methods and assessment practices.
(2010) Cole, Fletcher; Cox, Shane; Frances, MaudeConference PaperAn opportunity to explore the topic of data usages is presented by the collaborative research being undertaken by a federation of applied science research units affiliated with a number of different Australian research organizations (the Cluster). The research aims to investigate how members of the collaboration understand and work with data in their day-to-day practice.