Control System Design Guide. Using your Computer to Develop by George Ellis

By George Ellis

It is a sensible method of keep watch over options. the writer covers heritage fabric on analog controllers, electronic controllers, and filters. everyday controllers are offered. prolonged use of PSpice (a renowned circuit simulation application) is utilized in challenge fixing. The booklet is additionally documented with 50 laptop courses that circuit designers can use.

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The simplest remedy is an analog prefilter that conditions the input signal. The filter should have enough attenuation so that the amplitude of components with frequencies above half the sample rate is insignificant. Fortunately, few digital control systems have problems with aliasing, and often you will be able to ignore the effect. High-frequency signals in analog control systems, if they aire present, are normally generated by the controller. This does not occur in digital systems because the microproces­ sor cannot generate any components with frequencies above half the sample rate.

20 in Appendix A. The following example also shows that the filter is also slightly easier to imple­ ment. Once again, return to the low-pass filter. 35) 40 3. 35 can be phase advanced by replacing the (z + 1) with 2z. 5219 3 3 6 ) This function is easier to implement as well. ,.! i be stored. It also re­ quires one less addition. When do you use the phase advanced form? Normally, it will be to your advantage to eliminate at least one factor of ζ + 1 from the numerator, since this is a reasonably noise-insensitive way to advance the phase.

Disturbance rejection is evaluated in the frequency domain by removing the system com­ mand and treating the disturbance as the input. Normally, responsive sys­ tems reject disturbances well. P a r a m e t e r Sensitivity Parameter sensitivity is the measure of the extent to which the system changes when parameters change. For example, the inductance of a coil decreases as the current increases. , parameters of many compo­ nents change with temperature), and (2) parameters can vary from one unit 54 4.

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