The concept of ‘‘conservation of dimensions’’ will then be applied to
the dimensional analysis and scale-up of engineering systems. It will be
shown how these principles are used in the design and interpretation of
laboratory experiments on ‘‘model’’ systems to predict the behavior of
large-scale (‘‘field’’) systems (this is also known as similitude). These concepts
are presented early on, because we shall make frequent use of them in
describing the results of both theoretical and experimental analyses of
engineering systems in a form that is the most concise, general, and useful.
These methods can also provide guidance in choosing the best approach to
take in the solution of many complex problems.The dimensions of a quantity identify the physical charcter of that quantity,
e.g., force (F), mass (M), length (L), time (t), temperature (T), electric
charge (e), etc. On the other hand, ‘‘units’’ identify the reference scale by
which the magnitude of the respective physical quantity is measured. Many
different reference scales (units) can be defined for a given dimension; for
example, the dimension of length can be measured in units of miles, centimeters,
inches, meters, yards, angstroms, furlongs, light years, kilometers,
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
الرجوع الى لوحة التحكم
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