DESIGN OF CONTROL SYSTEMS WITH TIME DELAYS FOR MIXED SENSITIVITY SPECIFICATION AND ROBUST PERFORMANCE

在反馈控制系统的设计中，在被控对象存在干扰和扰动的情况下，对参考输入的误差较小，要求较低的灵敏度。为了鲁棒稳定性，互补灵敏度必须很小。灵敏度和互补值不能同时降为零。为了克服这一困境，提出了双盘混合灵敏度问题和鲁棒性能，使低频灵敏度更低，高频灵敏度更小。本研究项目的目的是提出一种系统的设计方法。提出了两盘混合灵敏度问题的内模控制方法，并提交给ijc，1997。采用带观测器和自由参数的状态反馈控制方法解决了系统的鲁棒性能问题，并在2^<和> ascc下给出了解决方案。提出了两盘混合灵敏度问题的迭代解，并将其提交给了sce。同时指出，时滞系统的控制性能不能用2盘混合灵敏度指标来描述。提出了在2^<和> ascc条件下的三盘混合灵敏度问题及其求解方法，并进行了仿真数学计算。

IN THE DESIGN OF THE FEEDBACK CONTROL SYSTEMS,THE LOWER SENSITIVITY IS REQUIRED FOR SMALL ERROR TO THE REFERENCE INPUT IN THE PRESENCE OF DISTURBANCES AND PERTURBATIONS OF THE PLANT.FOR THE ROBUST STABILITY,THE COMPLEMENTARY SENSITIVITY HAS TO BE SMALL.THE SENSITIVITY AND THE COMPLEMENTARY ONE CAN NOT DECREASE TO ZERO SIMULTANIOUSLY.TO OVERCOME THE DILEMMA,TWO DISK MIXED SENSITIBITY PROBLEM AND ROBUST PERFORMANCE ARE PROPOSED TO MAKE THE SENSITIVITY LOWER FOR LOW FREQUANCY AND THE COMPLEMENTARY ONE SMALLER FOR HIGH FREQUENCY.THE PURPOSE OF THE RESEARCH PROJECT IS TO PRESENT AN SYSTEMATIC DESIGN METHOD.INNER MODEL CONTROL APPROACH TO 2 DISK MIXED SENSITIVITY PROBLEM WAS PROPOSED AND SUBMITTDE TO IJC,1997. A SOLUTION TO ROBUST PERFORMANCE WAS PROPOSED BY USING STATE FEEDBACK CONTROL WITH OBSERVER AND FREE PARAMETER AND PRESENTED AT 2^<ND> ASCC.AN ITERATIVE SOLUTION TO 2 DISK MIXED SENSITIVITY PROBLEM WAS PRESENTED AND SUBMITTED TO SICE.FURTHERMORE,IT WAS POINTED OUT THAT THE CONTROL PERFORMANCE OF TIME DELAY SYSTEM CAN NO BE COVERED BY 2 DISK MIXED SENSITIVITY SPECIFICATION.THREE DISK MIXED SENSITIVITY PROBLEM AND ITS SOLUTION WERE PROPOSED AND PRESENTED AT 2^<ND> ASCC AND MATHEMATICS AND COMPUTATIONS IN SIMULATION.