耳鸣是临床上一种没有外界声源刺激产生的主观听觉感知。研究表明相似不重复的分形音或是与耳鸣相近频段的声音能治疗或缓解耳鸣。现有合成的耳鸣音乐存在频率单一和试听效果差等问题,因此提出一种既有舒缓的分形音乐又有特定频段自然...耳鸣是临床上一种没有外界声源刺激产生的主观听觉感知。研究表明相似不重复的分形音或是与耳鸣相近频段的声音能治疗或缓解耳鸣。现有合成的耳鸣音乐存在频率单一和试听效果差等问题,因此提出一种既有舒缓的分形音乐又有特定频段自然音的个性化耳鸣康复音的数字合成新方法。该方法首先基于迭代函数系统算法(iterative function system,IFS)、调内音符、和弦伴奏生成音乐的第一、二音轨,再基于迭代函数系统算法、线性比例重叠相加法、含有特定频段的自然音片段生成音乐的第三音轨。实验结果表明,此方法合成的音乐符合分形音乐的基本特征,试听效果舒缓,在模拟耳鸣模型中也能对同频段的耳鸣声起到抑制作用,对耳鸣治疗具有一定的参考价值。展开更多
This paper attempts to set a unified scene for various linear time-invariant (LTI) control system design schemes, by transforming the existing concept of “computer-aided control system design” (CACSD) to novel “com...This paper attempts to set a unified scene for various linear time-invariant (LTI) control system design schemes, by transforming the existing concept of “computer-aided control system design” (CACSD) to novel “computer-automated control system design” (CAutoCSD). The first step towards this goal is to accommodate, under practical constraints, various design objectives that are desirable in both time and frequency domains. Such performance-prioritised unification is aimed at relieving practising engineers from having to select a particular control scheme and from sacrificing certain performance goals resulting from pre-commitment to such schemes. With recent progress in evolutionary computing based extra-numeric, multi-criterion search and optimisation techniques, such unification of LTI control schemes becomes feasible, analytical and practical, and the resultant designs can be creative. The techniques developed are applied to, and illustrated by, three design problems. The unified approach automatically provides an integrator for zero-steady state error in velocity control of a DC motor, and meets multiple objectives in the design of an LTI controller for a non-minimum phase plant and offers a high-performance LTI controller network for a non-linear chemical process.展开更多
A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model P...A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model Predictive Controller(MPC)design.MPC predicts the future trajectory of the dynamic model by calculating the optimal closed loop feedback gain matrix.In this paper,the optimal closed loop feedback gain matrix was calculated using Kautz function.Being an Orthonormal Basis Function(OBF),Kautz function has an advantage of solving complex pole-based nonlinear system.Genetic Algorithm(GA)was applied to optimally tune the Kautz function-based MPC.A constraint based on phase plane analysis was implemented with the cost function in order to improve the robustness of the Kautz function-based MPC.The proposed method was simulated with three area interconnected power system and the efficiency of the proposed method was measured and exhibited by comparing with conventional Proportional and Integral(PI)controller and Linear Quadratic Regulation(LQR).展开更多
文摘耳鸣是临床上一种没有外界声源刺激产生的主观听觉感知。研究表明相似不重复的分形音或是与耳鸣相近频段的声音能治疗或缓解耳鸣。现有合成的耳鸣音乐存在频率单一和试听效果差等问题,因此提出一种既有舒缓的分形音乐又有特定频段自然音的个性化耳鸣康复音的数字合成新方法。该方法首先基于迭代函数系统算法(iterative function system,IFS)、调内音符、和弦伴奏生成音乐的第一、二音轨,再基于迭代函数系统算法、线性比例重叠相加法、含有特定频段的自然音片段生成音乐的第三音轨。实验结果表明,此方法合成的音乐符合分形音乐的基本特征,试听效果舒缓,在模拟耳鸣模型中也能对同频段的耳鸣声起到抑制作用,对耳鸣治疗具有一定的参考价值。
文摘This paper attempts to set a unified scene for various linear time-invariant (LTI) control system design schemes, by transforming the existing concept of “computer-aided control system design” (CACSD) to novel “computer-automated control system design” (CAutoCSD). The first step towards this goal is to accommodate, under practical constraints, various design objectives that are desirable in both time and frequency domains. Such performance-prioritised unification is aimed at relieving practising engineers from having to select a particular control scheme and from sacrificing certain performance goals resulting from pre-commitment to such schemes. With recent progress in evolutionary computing based extra-numeric, multi-criterion search and optimisation techniques, such unification of LTI control schemes becomes feasible, analytical and practical, and the resultant designs can be creative. The techniques developed are applied to, and illustrated by, three design problems. The unified approach automatically provides an integrator for zero-steady state error in velocity control of a DC motor, and meets multiple objectives in the design of an LTI controller for a non-minimum phase plant and offers a high-performance LTI controller network for a non-linear chemical process.
文摘A continuous-time Model Predictive Controller was proposed using Kautz function in order to improve the performance of Load Frequency Control(LFC).A dynamic model of an interconnected power system was used for Model Predictive Controller(MPC)design.MPC predicts the future trajectory of the dynamic model by calculating the optimal closed loop feedback gain matrix.In this paper,the optimal closed loop feedback gain matrix was calculated using Kautz function.Being an Orthonormal Basis Function(OBF),Kautz function has an advantage of solving complex pole-based nonlinear system.Genetic Algorithm(GA)was applied to optimally tune the Kautz function-based MPC.A constraint based on phase plane analysis was implemented with the cost function in order to improve the robustness of the Kautz function-based MPC.The proposed method was simulated with three area interconnected power system and the efficiency of the proposed method was measured and exhibited by comparing with conventional Proportional and Integral(PI)controller and Linear Quadratic Regulation(LQR).
