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Ǯѧɭ1954Äê˵¹¤³Ì¿ØÖÆÂÛ Engineering Cybernetics H. S. Tsien McGraw-Hill Book Company, Inc. 1954 -------------------------------------------------------------------------------- Preface The celebrated physicist and mathematician A. M. Ampere coined the word cybernetique to mean the science of civil government (Part II of "Essai sur la philosphie des sciences," 1845, Paris). Ampere's grandiose scheme of political sciences has not, and perhaps never will, come to fruition. In the meantime, conflict between governments with the use of force greatly accelerated the development of another branch of science, the science of control and guidance of mechanical and electrical systems. It is thus perhaps ironical that Ampere's word should be borrowed by N. Wiener to name this new science, so important to modern warfare. The "cybernetics" of Wiener ("Cybernetics, or Control and Communication in the animal and the Machine," John Wiley & Sons, Inc., New York, 1948) is the science of organization of mechanical and electrical components for stability and purposeful actions. A distinguishing feature of this new science is the total absence of considerations of energy, heat, and efficiency, which are so important in other natural sciences. In fact, the primary concern of cybernetics is on the qualitative aspects of the interrelations among the various components of a system and the synthetic behavior of the complete mechanism. The purpose of "Engineering Cybernetics" is then to study those parts of the broad science of cybernetics which have direct engineering applications in designing controlled or guided systems. It certainly includes such topics usually treated in books on servomechanisms. But a wider range of topics is only one difference between engineering cybernetics and servomechanisms engineering. A deeper---and thus more important---difference lies in the fact that engineering cybernetics is an engineering science, while servomechanisms engineering is an engineering practice. An engineering science aims to organize the design principles used in engineering practice into a discipline and thus to exhibit the similarities between different areas of engineering practice and to emphasize the power of fundamental concepts. In short, an engineering science is predominated by theoretical analysis and very often uses the tool of advanced mathematics. A glance at the contents of this book makes this quite evident. The detailed construction and design of the components of the system---the actual implementation of the theory---are almost never discussed. No gadget is mentioned.    Êղؠ  ·ÖÏí   ¶¥(0)