By K. C. Garner, W. Fishwick
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DAVIS, S. , and LEDGERWOOD, B. , Electromechanical Components for Servomechanisms, McGraw-Hill, 1961. 10. UPSON, A. , and BATCHELOR, J. , Synchro Engineering Handbook, Hutchinson, London, 1966. 1. Requirements To determine the response of a control system, the system must be excited in such a way that the input signal and the output signal can be compared in some formal way. This really only implies that the input signal should be adequately measured, but it could be any complicated waveform. However, simple aperiodic and periodic waveforms are chosen for two excellent reasons.
A signal proportional to the velocity of displacement of the mass with respect to the frame, in the force-balance servo system. Accelerometers have two main measuring functions : (a) to measure quasi-steady accelerations in vehicles and aircraft; and (b) to measure alternating accelerations or vibrations in various mechanical structures. 13. Pressure transducers Pressure transducers transform a fluid pressure signal into a mechanical deflexion, which in turn may be converted to an electrical output signal by means of one of the electrical transducers considered previously.
For non-linear systems it is never possible to make an arbitrary choice of point of injection as vastly different responses can ensue. If a transducer has to be used in series with the transient signal source and the chosen system input, the transducer's own transfer function must obviously be taken into account. As a general rule in this respect it is usually acceptable that an effective stepfunction approximation to a system should contain frequencies 100 times the main corner frequency of the system under test.