Samuel Seely's An Introduction to Engineering Systems PDF

By Samuel Seely

ISBN-10: 0080168213

ISBN-13: 9780080168210

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Refer to 42 Modeling of System Elements Fig. 1-41. Fluid (liquid) capacitance. Fig. 1-41 which illustrates the situation. Conservation of mass requires that the change in volume of the liquid being stored in a tank is specified by the fluid flow rate into the tank. Thus, 0Q = — = AA— =dVdh dt dt dh dt ( (mm 3/ S/ sCeCc)) (1-59) where V denotes the volume, and A the sectional area of the tank. Now, in analogy with Eq. (1-7) for electrical capacitance, we define C in terms of flow and time rate of change of head.

An electromechanical transducer such as a radio loudspeaker will have one electrical port and one mechanical port (plus, in fact, an acoustic port); a thermoelectric transducer will have one ther­ mal port and one electrical port; an accelerometer will produce an elec­ trical output corresponding to some function of the mechanical motion. As one example, we consider an accelerometer, somewhat in the form illustrated in Fig. 1-45. A coupling field is established between the elec­ trical and the mechanical circuits.

Physical springs satisfy this relationship for forces below the elastic limit of the material. Deviations from this linear relation may occur for a number of reasons including, temperature effects, rotation of the spring ends, hysteresis, and others. The schematic representation of the spring element is given in Fig. 1-27. The analytic relations between the through and the across variables are the pair of equations, / = K(xx -JC 2 ) = KJ(vl-v2)dt=KJ ±df Kdt' vdt, d-36) The Damper 31 -JSlSLr Fig.

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An Introduction to Engineering Systems by Samuel Seely


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