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Книга по требованию: Minutes of Proceedings of the Institution of Civil Engineers, Vol. 95

Товар № 11246643

With Others Selected and Abstracted Papers (Classic Reprint)

Вес: 0.88 кг.
Год издания: 2015
Страниц: 562 Переплет: мягкая обложка
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Excerpt from Minutes of Proceedings of the Institution of Civil Engineers, Vol. 95: With Others Selected and Abstracted Papers

The Telford and Watt Medals, the George Stephenson Medal, the Telford Premiums, the Manby Premium, and the Miller Prizes, awarded for the Session 1887-88 (vol. xciv. pp. 152, 153) were presented by the President to the various recipients.

(Paper No. 2328.)

"Friction-Brake Dynamometers."

By William Worby Beaumont, M. Inst. C.E.

Although the friction-brake dynamometer can never give a scientifically accurate measurement of the rate of absorption of the work done upon it by any motor, it has been much used for that purpose, with results not sufficiently incorrect to affect materially the truth of calculations based upon them.

The indications of any apparatus depending on friction must be as variable as the causes of friction and the conditions affecting it, and hence the value of the measurements, obtained by means of a friction-brake dynamometer, must depend on the completeness with which these causes and conditions are taken into consideration or are eliminated.

In a friction-brack the causes of friction are similar to those which generally obtain in other applications of materials when brought into rubbing contact; but the conditions are more variable, and are chiefly due to variation in pressure and in lubrication, both these being affected by variation in the rate of work-absorption and temperature.

From time to time the accuracy of the measurements of power obtained with friction-dynamometers has been questioned; and this Paper is written with the object of placing such facts and considerations before the Institution as will elicit the views which arc supported by practice among engineers.

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