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A reduced order model for coupled mode cascade flutter analysis

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Chinese Journal of Aeronautics 2022年第10期35卷 176-182页

作者： Huang HUANG Xinkai jia jia ren Bochao CAO Dingxi WANG Xiuquan HUANG School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Yangtze River Delta Research Institute of Northwestern Polytechnical University Taicang 215400China Department of Aeronautics and Astronautics Fudan UniversityShanghai 200433China

A Reduced Order Model(ROM)based analysis method for turbomachinery cascade coupled mode flutter is presented in this *** unsteady aerodynamic model is established by a system identification technique combined with a set of Aerodynamic Influence Coefficients(AIC).Subsequently,the aerodynamic model is encoded into the state space and then coupled with the structural dynamic equations,resulting in a ROM of the cascade *** cascade flutter can be determined by solving the eigenvalues of the ***-torsional coupled mode flutter analysis for the Standard Configuration Eleven(SC11)cascade is used to validate the proposed method.

关键词： Aerodynamic influence coefficients Chirp signal Coupled mode flutter Eigenvalue problem Reduced order model

UAV target tracking algorithm based on task allocation consensus

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Journal of Systems Engineering and Electronics 2016年第6期27卷 1207-1218页

作者： Yani Cui jia ren Wencai Du Jingguo Dai College of Information Science & Technology Hainan University

In order to adapt to the changes in the states of moving targets and meet the requirements of quality of service in communication among unmanned aerial vehicles (UAVs), the UAVs formation needs to dynamically adjust tracking tasks and tracking paths, when they carry out a mission of tracking multiple moving targets. A multi-targets tracking algorithm based on task allocation consensus is proposed for UAVs to track multiple moving targets under the distributed control architecture in the limited communication range. This algorithm creates a distributed dynamic task allocation model using intermittent asynchronous communication principle to realize the sharing of observation information gathered by each UAV with fewer communications. In addition, this algorithm also makes it possible that multi-UAVs can plan tracking paths for multiple moving targets. We implement the algorithm on the formation with three UAVs to track three moving targets through simulation. Simulation results show the effectiveness of the proposed algorithm. © 2016 Beijing Institute of Aerospace Information.

关键词： Closed loop control systems Motion planning Quality of service Tracking (position) Unmanned aerial vehicles (UAV) Vehicle to vehicle communications

Three Types of Expression in Dark-Soliton Perturbation Theory Based on Squared Jost Solutions

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Communications in Theoretical Physics 2007年第1期47卷 15-18页

作者： AO Sheng-Mei YAN jia-ren College of Physics and Information Science Hunan Normal University Changsha 410081 China

Three types of expression in the dark-soliton perturbation theory based on squared Jost solutions are invesgigaged in ghis paper. It is shown that there are three formally different results about the effects of perturbagion on a dark soliton, and it is proved by means of a transformation between two integral variables that they are essentially equivalent.

关键词： dark soliton perturbation theory squared Jost solution soliton velocity first-order correction

Proportion integral-type active disturbance rejection generalized predictive control for distillation process based on grey wolf optimization parameter tuning

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Chinese Journal of Chemical Engineering 2022年第9期35卷 234-244页

作者： jia ren Zengqiang Chen Mingwei Sun Qinglin Sun Zenghui Wang College of Artificial Intelligence Nankai UniversityTianjin 300350China Key Lab of Intelligent Robotics of Tianjin Tianjin 300350China Department of Electrical and Mining Engineering University of South AfricaFlorida 1710South Africa

The high-purity distillation column system is strongly nonlinear and coupled,which makes it difficult to *** disturbance rejection control(ADRC)has been widely used in distillation systems,but it has limitations in controlling distillation systems with large time delays since ADRC employs ESO and feedback control law to estimate the total disturbance of the system without considering the large time *** paper designs a proportion integral-type active disturbance rejection generalized predictive control(PI-ADRGPC)algorithm to control the distillation column system with large time *** replaces the PD controller in ADRC with a proportion integral-type generalized predictive control(PI-GPC),thereby improving the performance of control systems with large time *** the proposed controller has many parameters and is difficult to tune,this paper proposes to use the grey wolf optimization(GWO)to tune these parameters,whose structure can also be used by other intelligent optimization *** performance of GWO tuned PI-ADRGPC is compared with the control performance of GWO tuned ADRC method,multi-verse optimizer(MVO)tuned PI-ADRGPC and MVO tuned *** simulation results show that the proposed strategy can track reference well and has a good disturbance rejection performance.

关键词： Proportion integral-type active disturbance rejection generalized predictive control Grey wolf optimization Parameter tuning Distillation Process control Prediction

The Dynamics of a Bright-Bright Vector Soliton in Bose-Einstein Condensation

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Chinese Physics Letters 2012年第5期29卷 18-21页

作者： AN jia-ren ZHOU Jie AO Sheng-Mei Department of Physics Hunan Normal UniversityChangsha 410081

The dynamics of a bright-bright vector soliton in cigar-shaped Bose-Einstein condensate trapping in a harmonic potential is *** interaction between bright solitons in different species with small separation is *** the interaction between solitons of the same species,it is independent of the phase difference between the solitons,and may be of attraction or *** the former case,each soliton will oscillate about and pass through each other around the mass center of the system,which will also oscillate harmonically due to harmonic trapping potential.

关键词： harmonic soliton Einstein

Influence of liquid bridge force on physical stability during fuel storage and transportation

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Defence Technology（防务技术） 2023年第11期29卷 106-116页

作者： Chi Zhang Chun-hua Bai jia-fan ren jian Yao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China

The physical stability of solid-liquid fuel is a factor that needs to be considered for fuel product practicability for storage and transportation. To determine the Influence of liquid bridge force on physical stability, two detection devices were designed. The laws obtained from microscopic experiments are used to verify the physical stability of fuel under different component ratios. The liquid bridge force is found to increase with the droplet volume. Multiliquid bridges above one critical saturation can generate significant resultant forces compared to single-liquid bridges of the same volume. There exist four states of solid-liquid mixed fuel with increasing liquid saturation rate. The liquid bridge force between the solid and liquid plays a dominant role in the physical stability of the first three states. There may be two stages involved in the stratification process for state 4 fuel, and the liquid viscosity is another factor that cannot be ignored. In the process of selecting a fuel ratio, a larger liquid bridge force between the components can be obtained by properly improving the wetting effect so that the fuel shows better physical stability.

关键词： Liquid bridge force Fuel physical stability Multiliquid bridge resultant forces Mixed fuel stratification

PERTURBATION THEORY FOR NONLINEAR KLEIN-GORDON EQUATION

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Applied Mathematics and Mechanics(English Edition) 2002年第8期23卷 987-992页

作者： LIU Tian-gui(刘天贵) YAN jia-ren(颜家壬) Department of Physics Hunan Normal University Changsha 410081 P R China Department of Physics Hunan Normal University Changsha 410081 P R China

The effects of perturbations on a nonlinear Klein-Gordon the soliton to the first-order approximation are obtained, namely, the soliton parameters changing slowly with time, and the concrete expression of the first-or... 详细信息

关键词： soliton perturbation soliton parameter nonlinear Klein-Gordon soliton

Global Existence,Asymptotic Behavior and Uniform Attractors for Non-autonomous Thermoelastic Systems

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Acta Mathematicae Applicatae Sinica 2016年第4期32卷 1015-1034页

作者： Yu-ming QIN Tian-hui WEI jia ren Department of Applied Mathematics Donghua University

In this paper, we first establish the global existence and asymptotic behavior of solutions by using the semigroup method and multiplicative techniques, then further prove the existence of a uniform attractor for a non-autonomous thermoelastic system by using the method of uniform contractive functions. The main advantage of this method is that we need only to verify compactness condition with the same type of energy estimates as that for establishing absorbing sets. Moreover, we also investigate an alternative result of solutions to the semilinear thermoelastic systems by virtue of the semigroup method.

关键词： Thermoelastic systems global existence asymptotic behavior uniform attractors semigroupmethods

A Two-Soliton Solution of Cubic Schrodinger Equation

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Chinese Physics Letters 1996年第1期13卷 17-19页

作者： YAN jia-ren CHOU Guang-hui WANG Xiao-gang Department of Physics Hu'nan Normal UniversityChangsha 410081

An exact two-soliton solution of cubic Schrodinger equation is derived by using the inverse scattering method,where the transmission coefficient has one pole of second order instead of two simple *** solution describes such a process that two infinitely separated solitons approach and then pass through each other and keep straight on infinitely.

关键词： infinitely straight soliton