Engineering Cybernetics en
Introduction
Knowledge base from Engineering Cybernetics (《工程控制论》) by H. S. Tsien / 钱学森, 1954 English original (McGraw-Hill, 312 pp). Use when applying 钱学森's classic-frequency-domain frameworks to control design: 传递函数/频响三表示、稳定性判据（Nyquist/Evans 根轨迹/Bode）、解耦控制（Boksenbom–Hood）、时滞（Satche 图）与采样（星号变换）、随机输入谱分析、继电器/非线性与最优切换、变系数摄动制导、积分准则/寻优/维纳滤波、超稳定与冯·诺依曼复用误差控制，or studying the book. 中文讲解 + 英文原术语。
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