Abstract
There are many situations where imprecise or incomplete information is available about a problem until an approximate solution of the problem is obtained. To give a simple example, in most of the mechanics problem, one has to use a coefficient of friction whose value is not known precisely. While one can measure the mass of the body quite easily and values of applied forces may be known, the coefficient of friction may not be known precisely. For example Merium and Kraige [1] give a table of friction for various contacting surfaces, but mention that a variation of 25–100% or more from those values could be expected in an actual application, depending on prevailing conditions of cleanliness, surface finish, pressure, lubrication, and velocity. Notwithstanding the prevalent imprecision in the values of coefficient of friction, most of the time one does carry out precise (hard) computations with the most likely value of the coefficient of friction. However, such hard computations without a mention of imprecision in the solution have limited practical utility.
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(2008). Background on Soft Computing. In: Modeling of Metal Forming and Machining Processes. Engineering Materials and Processes. Springer, London. https://doi.org/10.1007/978-1-84800-189-3_8
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