{'fraction_non_alphanumeric': 0.01443001443001443, 'fraction_numerical': 0.0, 'mean_word_length': 5.1415929203539825, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
SUBOPTIMAL CONTROL OF SYSTEMS WITH INPUT DELAY

The stabilization by feedback control of systems with input delays may be considered in various frameworks; a very popular is the abstract one, based on the inclusion of such systems in the Pritchard-Salamon class. In this paper we consider the elementary approach based on variants of the Smith predictor, make a system theoretic analysis of the compensator and suggest a computer control implementation. It is further considered the case of the optimal stabilization with quadratic performance index. In this case, piecewise constant feedback is shown to be suboptimal. Some numerical experiments show the robustness with respect to the delay.