Read e-book online Electromechanical Dynamics, Part I: Discrete Systems PDF

By Herbert H. Woodson, James R. Melcher

ISBN-10: 0471959855

ISBN-13: 9780471959854

Http:// First released in 1968 by means of John Wiley and Sons, Inc., Electromechanical Dynamicsdiscusses the interplay of electromagnetic fields with media in movement. the topic combines classical mechanics and electromagnetic idea and offers possibilities to improve actual instinct. The ebook makes use of examples that emphasize the connections among actual fact and analytical versions. different types of electromechanical interactions coated contain rotating equipment, plasma dynamics, the electromechanics of organic structures, and magnetoelasticity.

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Additional info for Electromechanical Dynamics, Part I: Discrete Systems

Example text

In this expression we have indicated explicit functional dependence only on those variables (i and x) that may be functions of time. 9) and expand the time derivative to obtain v = dJ, = 0), di + OA dx . 11) This expression illustrates some general terminal properties of magnetic 20 Lumped Electromechanical Elements field systems. 11) is proportional to di/dt and is the result of changing current. This term can exist when the system is mechanically stationary and is often referred to as a transformer voltage.

In order to obtain a representation for a mass element more general than a point mass, we need to review briefly the dynamics of rigid bodies. We consider first the translational motion of a rigid body. A rigid body, by definition, is one in which any line drawn in or on the body remains constant in length and all angles drawn in or on the body remain constant. In Fig. 12 we represent a rigid body with a mass density p (kilograms per cubic meter) that may vary from point to point in the body but remains constant in time at any point in the body.

Conventional circuit theory is the special case of stationary systems in which quasi-static electromagnetic field theory applies. All the concepts of circuit theory can be derived from field theoryt; for example, Kirchhoff's current law is derived from the conservation of charge. 1) where the surface S encloses the node. 2) where ik is the current flowing away from the node on the kth wire. Kirchhoff's voltage law is obtained by recognizing that a voltage is uniquely defined only in a region in which the time rate of change of magnetic flux density is negligible.

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Electromechanical Dynamics, Part I: Discrete Systems by Herbert H. Woodson, James R. Melcher

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