This paper proposes a self-tuning iterative learning control method for the attitude control of a flexible solar power satellite,which is simplified as an Euler-Bernoulli beam moving in space.An orbit-attitude-structu...This paper proposes a self-tuning iterative learning control method for the attitude control of a flexible solar power satellite,which is simplified as an Euler-Bernoulli beam moving in space.An orbit-attitude-structure coupled dynamic model is established using absolute nodal coordinate formulation,and the attitude control is performed using two control moment gyros.In order to improve control accuracy of the classic proportional-derivative control method,a switched iterative learning control method is presented using the control moments of the previous periods as feedforward control moments.Although the iterative learning control is a model-free method,the parameters of the controller must be selected manually.This would be undesirable for complicated systems with multiple control parameters.Thus,a self-tuning method is proposed using fuzzy logic.The control frequency of the controller is adjusted according to the averaged control error in one control period.Simulation results show that the proposed controller increases the control accuracy greatly and reduces the influence of measurement noise.Moreover,the control frequency is automatically adjusted to a suitable value.展开更多
老年人睡眠质量和睡眠时间是衡量个体健康的关键指标。传统的多导睡眠图(Polysomnography,PSG)是医学实践中睡眠监测的黄金标准,但其复杂性极大地限制了应用,同时也阻碍了在医院环境外更广的范围开展。在社区健康管理中,对居家老年人睡...老年人睡眠质量和睡眠时间是衡量个体健康的关键指标。传统的多导睡眠图(Polysomnography,PSG)是医学实践中睡眠监测的黄金标准,但其复杂性极大地限制了应用,同时也阻碍了在医院环境外更广的范围开展。在社区健康管理中,对居家老年人睡眠时长、睡眠质量等各项睡眠指标进行长期稳定的监测和分析的需求日益增加。随着物联网(Internet of Things,IoT)等新一代信息技术的发展,将来非接触式智能床垫系统可以在睡眠中实时监测呼吸、心率、血压、血氧等指标,并能够将监测结果上传云端进行数据分析;医生也可以根据数据进行监测管理和健康指导,老年人及其子女也可以进行自我健康管理。随着非接触式睡眠监测系统在社区的推广与应用,非接触式睡眠监测系统可以参与到慢性病高危人群风险评估、健康咨询、健康管理、定制个性化服务等全链条健康管理服务产业中。展开更多
基金supported by the Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110730)the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(No.2021QNRC001)the Fundamental Research Funds for the Central Universities of Sun Yat-sen University(No.22qntd0703)。
文摘This paper proposes a self-tuning iterative learning control method for the attitude control of a flexible solar power satellite,which is simplified as an Euler-Bernoulli beam moving in space.An orbit-attitude-structure coupled dynamic model is established using absolute nodal coordinate formulation,and the attitude control is performed using two control moment gyros.In order to improve control accuracy of the classic proportional-derivative control method,a switched iterative learning control method is presented using the control moments of the previous periods as feedforward control moments.Although the iterative learning control is a model-free method,the parameters of the controller must be selected manually.This would be undesirable for complicated systems with multiple control parameters.Thus,a self-tuning method is proposed using fuzzy logic.The control frequency of the controller is adjusted according to the averaged control error in one control period.Simulation results show that the proposed controller increases the control accuracy greatly and reduces the influence of measurement noise.Moreover,the control frequency is automatically adjusted to a suitable value.
文摘老年人睡眠质量和睡眠时间是衡量个体健康的关键指标。传统的多导睡眠图(Polysomnography,PSG)是医学实践中睡眠监测的黄金标准,但其复杂性极大地限制了应用,同时也阻碍了在医院环境外更广的范围开展。在社区健康管理中,对居家老年人睡眠时长、睡眠质量等各项睡眠指标进行长期稳定的监测和分析的需求日益增加。随着物联网(Internet of Things,IoT)等新一代信息技术的发展,将来非接触式智能床垫系统可以在睡眠中实时监测呼吸、心率、血压、血氧等指标,并能够将监测结果上传云端进行数据分析;医生也可以根据数据进行监测管理和健康指导,老年人及其子女也可以进行自我健康管理。随着非接触式睡眠监测系统在社区的推广与应用,非接触式睡眠监测系统可以参与到慢性病高危人群风险评估、健康咨询、健康管理、定制个性化服务等全链条健康管理服务产业中。
