Download Analog and Hybrid Computing by D. E. Hyndman, N. Hiller PDF
By D. E. Hyndman, N. Hiller
Analog and Hybrid Computing considers the elemental elements and principled of analog and hybrid pcs and their functions in a variety of clinical investigations. This e-book consists of 8 chapters, and starts off with a short presentation of the historical past of computing units utilizing a generalized movement diagram of computation, illustrating the basic changes among analog and electronic pcs. the next chapters care for the speculation and the operation of the elemental devices present in digital analog pcs, the tools of scaling difficulties for the pc, and the association and operation of computing device. those subject matters are via discussions at the suggestions of time-varying and non-linear differential equations and the simulation of move services, that's an incredible element of analog computation. The concluding bankruptcy describes many of the extra in smooth desktops. those chapters really spotlight the positive factors and merits of hybrid computing. This publication is of price to laptop engineers, scientists, and researchers, in addition to complicated computing device engineering scholars.
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Example text
If another device or a number of devices can be found having exactly the same gain versus gain setting characteristics, then it is possible to design a multiplier unit as shown in Fig. y)/u, etc. A number of types of multipliers based on this principal are available. y u Gain m(e 0 ) FIG. 21. Function multiplier using voltage controlled variable gain devices. y This is dependent only on being able to design units with an accurate square law characteristic. In modern machines this type of multiplier is most generally used.
Also, the maximum slope must not require voltage gradients between taps which will cause excessive current to flow in sections of the potentiometer. The accuracy with which a function can be generated depends on the number of taps on the potentiometer and the slope of the function curve. A disadvantage with tapped potentiometers is that the taps are normally equally spaced so that large errors can occur where the radius of curvature of the function is small. For functions which are frequently required, such as sine and cosine, specially wound potentiometers are available having a resistance law proportional to the function.
Flow Diagrams Let us consider the procedure in preparing a simple problem, such as the mass spring damper system which we have already discussed in Chapter 1, so that it can be solved on an analog computer. The physical system is illustrated in Fig. 1, where a mass of M kg is suspended from a support by a spring with stiffness K N/m and a damper with damping coefficient D N/m/sec. '///////////////A Jr FIG. 1. Mass spring, damper system A force of y N is applied to the system and the displacement of the mass from its initial position is x m.