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Decoupling Algorithms for the Gravitational Wave Spacecraft

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Computer modeling in Engineering & Sciences 2024年第7期140卷 325-337页

作者： XueWang Weizhou Zhu Zhao Cui Xingguang Qian Jinke Yang Jianjun Jia Yikun Wang Key Laboratory of Space Active Opto-Electronics Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of GravitationalWave Precision Measurement of Zhejiang Province Hangzhou Institute for Advanced StudyHangzhou310024China

The gravitational wave spacecraft is a complex multi-input multi-output dynamic system.The gravitational wave detection mission requires the spacecraft to achieve single spacecraft with two laser links and high-precision control.Establishing one spacecraftwith two laser links,compared to one spacecraft with a single laser link,requires an upgraded decoupling algorithmfor the link establishment.The decoupling algorithmwe designed reassigns the degrees of freedomand forces in the control loop to ensure sufficient degrees of freedomfor optical axis control.In addressing the distinct dynamic characteristics of different degrees of freedom,a transfer function compensation method is used in the decoupling process to further minimize motion coupling.The open-loop frequency response of the systemis obtained through simulation.The upgraded decoupling algorithms effectively reduce the open-loop frequency response by 30 dB.The transfer function compensation method efficiently suppresses the coupling of low-frequency noise.

关键词： Gravitational waves spacecraft laser acquisition decoupling algorithms dynamical model optical axis control

Research on dynamical model of Supply Chain and Its Chaotic Characteristics under MITS and BTO

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Research on Dynamical Model of Supply Chain and Its Chaotic ...

Review of human–robot coordination control for rehabilitation based on motor function evaluation

2009中国控制与决策会议

作者： YAO Feng ge,ZHANG Lei,ZHANG Meng School of Finance,Harbin University of Commerce,Harbin,150028,China

＜正＞Supply chain is an uncertain and stochastic complex system and the methods of supply chain management （SCM） in existence are not suited for complex environment.This paper models a demand oriented supply chain and validates the fork and chaos of the supply chain via simulation-approach,which might have an impact on it’s operation in many ways,such as flexible production and bullwhip effect mitigation,provides a new angle for supply chain management.

关键词： Supply Chain dynamical model Chaos

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Frontiers of Mechanical Engineering 2022年第2期17卷 37-50页

作者： Di SHI Liduan WANG Yanqiu ZHANG Wuxiang ZHANG Hang XIAO Xilun DING School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China School of Rehabilitation Medicine Weifang Medical UniversityWeifang 261053China Beijing Advanced Innovation Centre for Biomedical Engineering Beihang UniversityBeijing 100191China

As a wearable and intelligent system, a lower limb exoskeleton rehabilitation robot can provide auxiliary rehabilitation training for patients with lower limb walking impairment/loss and address the existing problem of insufficient medical resources. One of the main elements of such a human–robot coupling system is a control system to ensure human–robot coordination. This review aims to summarise the development of human–robot coordination control and the associated research achievements and provide insight into the research challenges in promoting innovative design in such control systems. The patients’ functional disorders and clinical rehabilitation needs regarding lower limbs are analysed in detail, forming the basis for the human–robot coordination of lower limb rehabilitation robots. Then, human–robot coordination is discussed in terms of three aspects: modelling, perception and control. Based on the reviewed research, the demand for robotic rehabilitation, modelling for human–robot coupling systems with new structures and assessment methods with different etiologies based on multi-mode sensors are discussed in detail, suggesting development directions of human–robot coordination and providing a reference for relevant research.

关键词： human–robot coupling lower limb rehabilitation exoskeleton robot motor assessment dynamical model perception

Recent progress on the seasonal tropical cyclone predictions over the western North Pacific from 2014 to 2020

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Tropical Cyclone Research and Review 2022年第1期11卷 26-35页

作者： Eun-Jeong Cha Se Hwan Yang Yu Sun Hyun Chang-Hoi Ho Il-Ju Moon Meso-scale Meteorological Phenomenon Research Team National Institute of Meteorological SciencesKorean Meteorological AdministrationJejuRepublic of Korea National Typhoon Center Korean Meteorological AdministrationJejuRepublic of Korea School of Earth and Environmental Sciences Seoul National UniversitySeoulRepublic of Korea Typhoon Research Center Jeju National UniversityJejuRepublic of Korea

This study summarized the procedure for the seasonal predictions of tropical cyclones(TCs)over the western North Pacific(WNP),which is currently operating at the Korea Meteorological Administration(KMA),Republic of Korea.The methodology was briefly described,and its prediction accuracy was verified.Seasonal predictions were produced by synthesizing spatiotemporal evolutions of various climate factors such as El Ni no–Southern Oscillation(ENSO),monsoon activity,and Madden–Julian Oscillation(MJO),using four models:a statistical,a dynamical,and two statistical–dynamical models.The KMA forecaster predicted the number of TCs over the WNP based on the results of the four models and season to season climate variations.The seasonal prediction of TCs is announced through the press twice a year,for the summer on May and fall on August.The present results showed low accuracy during the period 2014–2020.To advance forecast skill,a set of recommendations are suggested.

关键词： Tropical cyclones Seasonal prediction Western north pacific Statistical model Statistical-dynamical model dynamical model Forecast error and verification

Dynamics analysis in a tumor-immune system with chemotherapy

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Chinese Physics B 2021年第5期30卷 673-681页

作者：刘海英杨红丽杨联贵 School of Mathematical Sciences Inner Mongolia UniversityHohhot 010021China

An ordinary differential equation(ODE)model of tumor growth with the effect of tumor-immune interaction and chemotherapeutic drug is presented and studied.By analyzing the existence and stability of equilibrium points,the dynamic behavior of the system is discussed elaborately.The chaotic dynamics can be obtained in our model by equilibria analysis,which show the existence of chaos by calculating the Lyapunov exponents and the Lyapunov dimension of the system.Moreover,the action of the infusion rate of the chemotherapeutic drug on the resulting dynamics is investigated,which suggests that the application of chemotherapeutic drug can effectively control tumor growth.However,in the case of high-dose chemotherapeutic drug,chemotherapy-induced effector immune cells damage seriously,which may cause treatment failure.

关键词： dynamical model tumor-immune system chemotherapy chaos

dynamical load sharing behaviors of heavy load planetary gear system with multi-floating components

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International Journal of modeling, Simulation, and Scientific Computing 2018年第1期9卷 146-158页

作者： Xiangyang Xu Tianhong Luo Jiayuan Luo Xia Hua Reza Langari School of Mechatronics and Vehicle Engineering Chongqing Jiaotong University Chongqing 400074 P.R.China College of Optoelectronic Engineering Chongqing University Chongqing 400030P.R.China School of Mechanical Engineering Purdue University West Lafayette IN 47907-2088United States Department of Mechanical Engineering Texas A&M University College Station 77843 United States

To investigate the dynamical load sharing behaviors of multi-floating components in the heavy load planetary gear system,a multi-floating planetary gear system that includes a floating central component and a quasi-floating planet flexible supporting pin is employed.Then a 21 degree of freedom lumped parameters dynamical model of this system is presented to study the dynamical load sharing behaviors.Some influencing factors,such as supporting stiffness,positions error of sun or carrier,and external input load are analyzed on the dynamical load sharing of the planetary gear system with multi-floating components.The results demonstrate that the load sharing condition of the system is best when both the sun gear and planet gears are multi-floating at the same time.When the planet gear position errors remain constant,reducing the flexible pin stiffness of planet gear or increasing external input load can effectively improve the load sharing.These conclusions are verified by the relevant experiments.

关键词： Multi-floating components planetary gear system dynamical model load sharin

Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach:^(210)Po,^(212)Rn,and ^(213)Fr

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Chinese Physics C 2023年第3期47卷 127-137页

作者： Divya Arora P.Sugathan A.Chatterjee Inter-University Accelerator Centre Aruna AsafAli MargNew Delhi 110067India

The dissipative dynamics of nuclear fission is a well confirmed phenomenon that can be either described by a Kramers-modified statistical model or by a dynamical model employing the Langevin equation.Although dynamical models as well as statistical models incorporating fission delays have been found to explain the measured fission observables in several studies,they present conflicting results for shell closed nuclei in the mass region of 200.Notably,an analysis of the recent data on neutron shell closed nuclei in the excitation energy range of 40-80 MeV failed to provide a satisfactory description of the data,which was attributed to a mismatch with shell effects and/or entrance channel effects,without reaching a definite conclusion.In the present study,we demonstrate that a well established stochastic dynamical code can simultaneously reproduce the available data for pre-scission neutron multiplicities and fission and evaporation residue excitation functions for the following neutron shell closed nuclei^(210)Po and^(212)Rn and their isotopes^(206)Po and^(214,216)Rn without the need for including any extra shell or entrance channel effects.The relevant calculations are performed by using a phenomenological universal friction form factor with no ad-hoc adjustment of the model parameters.However,we note a significant deviation,beyond experimental errors,for some Frisotopes.

关键词： fusion-fission nuclear dissipation dynamical model neutron shell closure saddle shell corrections

Improved ECG signal compression method for E-healthcare

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The Journal of China Universities of Posts and Telecommunications 2019年第4期26卷 62-69页

作者： Gao Miao Yu Zhiguo Li Qingqing Wei Jinghe Gu Xiaofeng Engineering Research Center of Internet of Things Technology Applications Ministry of EducationDepartment of Electronic EngineeringJiangnan UniversityWuxi 214122China China Electronic Technology Group Corporation No.58 Research Institute Wuxi 214035China

For achieving a higher compression ratio(CR)in compression sensing,the time-sparse bio-signals,such as electrocardiograph(ECG),are generally directly filtered via a dynamic or fixed threshold,however,inevitably leading to the loss of critical diagnostic bio-information.We propose a compression scheme to reduce the transmitting loss.Instead of the directly utilizing the original ECG data,the residuals between original and synthetic ECG signals are applied as the input signal.We employ the dynamic model to guarantee the consistency between the synthetic ECG signals waves(P,Q,R,S,and T)and the originals.The feasibility of the proposed method is tested through operating on the recorded ECG signals from a healthy human.During the process of building simulation platform,the sparsity,percentage root mean difference(PRD)versus sampling frequency,and signals reconstruction algorithm are fully taken into account.Before compression,we set the threshold to filter the residual waves,in which utilizing the residuals as input data by setting the thresold as 0.01 mV and 0.08 mV resulted the amount reduction of the transmitting data by 18%and 81.2%,respectively.And the simulation results show that CR can reach 2.75 when the PRD value is less than 9%.

关键词： compressed sensing(CS) dynamical model synthetic ECG residuals

Soliton Solution of SU（3） Gauge Fields at Finite Temperature

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Chinese Physics Letters 2005年第9期22卷 2194-2197页

作者：王殿夫宋鹤山 Department of Physics Dalian University of Technology Dalian 116024

Starting from a soliton model of SU（3） gauge fields, we investigate the behaviour of the model at finite temperature. it is found that colour confinement at zero temperature can be melted away under high temperatures.

关键词： dynamical model SYMMETRY RESTORATION CONFINEMENT EQUATION QCD