Partners) wrote that the presentation of this Paper by Mr Rae and of a similar Paper by Mr Keith served the useful purpose of emphasizing the need for a thorough examination of the incidence of vibrations in turbo-generator foundations. With the rapid increase in size of plant in the past two decade$ the risk of incidence had increased markedly and greater reliance had to be placed on the satisfactory operation of individual machines. 83. On the other hand, German engineers had been obliged to make a much more theoretical approach owing to the work over many years of Dr E. Rausch, and of others, which had led to the issue of DIN.4024. From a private English translation of part of Dr Rausch's book, 'Maschinenfundamente und Andere Dynamisch Beanspruchte Baukonstruktionen', it was impossible not to be impressed by the extraordinary thoroughness of the German methods and by the many ingenious approximations used to overcome the more intractable complications. 84. Nevertheless, the German methods, which carried much conviction by their superficial clarity, required very critical application to a particular foundation; they were developed for much smaller foundations than was now common practice in power stations, and there seemed to be grounds for doubting if the conclusions reached by a design engineer, well versed in the disciplines of structural design and using these methods, could bear close resemblance to conditions in practice.
The British Standard Specification
85.It was for this reason that a suggestion was made recently to the Central Electricity Generating Board that a programme of research on the vibration of turbogenerator blocks should be undertaken. The suggestion, which was accepted, included the following proposals :(U) to observe thoroughly a particular block by recording precisely its modes and (6) to analyse current vibration desigo methods in the light of these observations; (c) to reduce the scale of these observations and analysis to a model, so as to permit rapid and economical modifications in form to be investigated and general principles to be deduced; frequencies of oscillation; ( d ) to examine the influence of the subsoil and of piles on block vibrations; and (e) if possible, finally to draw up general recommendations for vibration design of turbo-generator foundations in the future.
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