By Samuel Seely

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Additional info for An Introduction to Engineering Systems

Example text

Owing to the inverse 6a3 in the denominator of this formula, a given R can be used only over a fairly small temperature range. The value of R so calculated when the source and receiver temperatures differ by a factor of two is only about 10 percent lower than that using a more elaborate expression based directly on Eq. (1-75). To discuss thermal capacitance, refer to Fig. l-44c. By adding heat to a system, its internal energy is increased, according to the relation Q==c Yt ( Joules / sec ) O-77) This expresses the heat added (or lost) with the consequent increase (or decrease) of temperature.

In. Determine the capacitance of this capacitor. 1-3. The B-H curve of a given ferromagnetic material, neglecting hysteresis, is illustrated. If this curve is to be represented by piecewise linear approximations between 0-Hx and Hx-H2, write the appropriate description for B as a function of H over the full range of operation a-a'. 58 Modeling of System Elements 1-4. Two windings are closely wound on a toroid that has a mean circumference of 10 inches with a coil radius of 1 inch. There are 1,000 turns per layer.

These are known as transducers or energy converters, and usually have the through and across variables at the two-ports in different physical forms. 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.