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(1995)Conference PaperMany methods for predicting the resistance of various types of marine craft are now available in the literature. Some methods are more reliable than others, and knowing which are the best can be important. At UNSW we have begun a long-term program of implementing the various methods for student use, and evaluating them by comparisons with available data. The prediction methods cover displacement, pre-planing and planing hulls, and catamarans. This paper looks at some of the methods which have been programmed and some which have not, their limitations, and some experiences of the use of those which have been programmed. The opportunity is also taken to correct typographical errata in some of the original papers which otherwise limits the use of the methods.
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(1999)Conference PaperPipe laggings are used as a means of inhibiting the transmission of sound radiated from pipes. They are usually formed of porous jackets such as fibreglass or rockwool blankets and impervious jackets such as cladding sheets. Sometimes air spaces are used to separate these jackets from the pipe and each other. Papers in the readily available literature relating to the acoustic performance of pipe laggings are generally concerned with presenting experimental results such as frequency dependent insertion losses. The authors have developed a model to calculate the insertion losses produced by such laggings when the lagged pipes are vibrating in their low order structural modes. The results of the model indicate that negative insertion lossess are not unexpected with conventional pipe laggings, particularly at low frequencies.
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(1992)Conference PaperThis paper is the outcome of a study made to investigate the students' approach to learning in a core subject of a first year Mechanical Engineering Course at the University of New South Wales. The Biggs Study Process Questionnaire was used to study the learning strategy of the students. Also, students were interviewed in order to understand their perceptions of the teaching context. A student evaluation of teaching was conducted using a standard evaluation procedure to investigate if the students' approach to learning is related to the teching adopted. It was found that a substantial proportion of students adopted a surface approach in their study strategies. The reasons for this are discussed in relation to the context of teaching and information obtained from students' feedback on teaching.
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(1995)Journal Article
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(1994)Journal ArticleThe development of computer-aided constrained optimization analyses and strategies for multipass peripheral and end-milling operations are outlined and discussed. The constrained optimization is based on criteria typified by the maximum production rate and includes a range of practical constraints of relevance to rough milling such as the machine tool limiting power, torque, feed force and feed-speed boundaries. It is shown that a combination of mathematical optimization analyses and limited use of numerical search techniques provides clearly defined computer-aided strategies which guarantee the final global optimum solutions. Simulation studies have verified the software and demonstrated the superiority of multipass over single pass
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(1993)Journal ArticleConstrained optimization strategies and computer flow charts for single-pass rough peripheral milling on NC/CNC and conventional machine tools are presented and discussed. Various practical machine tool constraints have been considered, namely the maximum available power, torque and feed force, and feed speed and cutting speed limits. The optimization strategies for this common operation have been found to be very complex and require computer assistance. A comparison of handbook recommended and optimal solutions has highlighted the significant benefits of using the latter, and the need for minimizing the component loading time and cost to maximize such benefits.
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(1995)Journal ArticleA model for chip flow direction is presented which combines the cutting action occurring at the primary cutting edge, nose radius edge and end cutting edge of general turning tools with inclination angles. The model determines an equivalent cutting edge which caters for the variations in the tool geometry and cutting conditions and the parameters of the equivalent cutting edge are used in a machining theory to predict the cutting forces. The results obtained theoretically and experimentally are in good agreement.