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1 .INTRODUCTIONThe exact analysis and design of high-order systemsare oftencomplicated.It is always desirable tosubsti-tute such a high-order systemby a si mplified system.Model reduction problems are ,therefore ,of consider-able interest all along.It may be more realistic that many real systemsare considered to contain pure ti me delays . Whensuch systems are approxi mated by rational models ,this oftenleadsthese modelsto be high order for goodapproxi mation.If a pure ti me delayisintro… 相似文献
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