The early development of machine diagnostics and condition monitoring was based on measurements from actual failures, but these cannot be predicted or arranged to occur when and where desired. In recent years it has become possible to make simulation models of a machine, such as a gearbox or engine, including the simulation of various faults of different types, severity and location. There are a number of benefits from doing this, the first being to be able to produce sufficient representative signals to train automated fault recognition algorithms such as artificial neural networks, as it is not economically viable to experience the number of actual failures required. Being able to produce signals from faults of different sizes and locations can be useful in the development of diagnostic and prognostic procedures, the latter for example by being able to develop appropriate trend parameters. Finally, the effects of faults in complex machines are often based on nonlinear interactions, which are difficult to foresee, and simulation modelling of the whole machine can be very useful to obtain a physical understanding of these complex interactions. The presentation illustrates these principles using examples of rolling element bearings, gears, geared systems (including bearings) and internal combustion engines, with favourable results in all aspects.

 

报告人简介：Bob Randall is a visiting Emeritus Professor in the School of Mechanical and Manufacturing Engineering at the University of New South Wales (UNSW), Sydney, Australia, which he joined as a Senior Lecturer in 1988. Prior to that, he worked for the Danish company Brüel & Kjær for 17 years, after ten years experience in the chemical and rubber industries in Australia, Canada and Sweden. His book “Frequency Analysis”, published by Brüel & Kjær in 1977 with a new edition in 1987, was widely distributed around the world, and translated into Japanese and Russian. A Chinese translation of the first edition was made in about 1980. He was promoted to Associate Professor in 1996 and to Professor in 2001, and was made an Emeritus Professor on his retirement in 2008. He has degrees in Mechanical Engineering and Arts (Mathematics, Swedish) from the Universities of Adelaide and Melbourne, respectively. He is the invited author of chapters on vibration measurement and analysis in a number of handbooks and encyclopedias, and a member of the editorial boards of four journals including Mechanical Systems and Signal Processing and Trans. IMechE Part C. His book Vibration-based Condition Monitoring: Industrial, Aerospace and Automotive Applications was published in 2011 by Wiley.  He is the author of more than 260 papers in the fields of vibration analysis and machine diagnostics, and has successfully supervised fifteen PhD and three Masters projects in those areas.  From 1996 to 2011 he was Director of the DSTO (Defence Science and Technology Organisation) Centre of Expertise in Helicopter Structures and Diagnostics at UNSW, with the main effort on diagnostics and prognostics of gears and bearings in helicopter gearboxes and gas turbine engines. He has twice been a Visiting Professor at Katholieke Universiteit Leuven, Belgium; for three months in 1997 and for one month in September 2012. He has also been a visiting professor at a number of other universities in France, the UK, Sweden, and Italy. He has given lectures in English, French, German, Danish, Swedish and Norwegian.