A design basis, previously developed for multiloop positional servomechanisms, has been extended to cascade-type systems. The design basis attempts to co-ordinate specifications, dynamic characteristics, interferences, and uncertainties from a consideration of the generation of torques by the system. The limitations of the system performance are distinguished from component characteristics. The concept of frequency-dependent coefficients is applied to the lead modifier damping model, the lag modifier, viscous damping model, and to the lag modifier, lead modifier damping model. It is shown that the performance may be understood from knowledge of second-order systems. Estimates of useful values of the parameters for each model are confirmed by analog studies.

This content is only available via PDF.
You do not currently have access to this content.