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正交相似组合系统是一类具有广泛工程背景的大系统，首先描述了Ｎ 个控制系统间的正交相似性，然后研究了一类正交相似组合系统的二次鲁棒分散镇定问题·给出了二次鲁棒分散镇定的一个充分条件·研究表明，若系统具有正交相似结构，则其控制器的设计将大为简化·最后，仿真实例说明了所采用方法的有效性·
Orthogonal similarity system is a kind of large-scale system with a wide range of engineering background. Firstly, the orthogonal similarity between N control systems is described. Then the quadratic robust decentralized stabilization problem for a class of orthogonal systems is studied. A sufficient condition for second-order robust decentralized stabilization is given. Studies show that the design of the controller is greatly simplified if the system has an orthonormal structure. Finally, the simulation shows the effectiveness of the proposed method.