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Research on nonlinear model predictive control for turboshaft engines based on double engines torques matching

Chinese Journal of Aeronautics 2020年第2期33卷 561-571页

作者： Yong WANG Qian’gang ZHENG Ziyan DU Haibo ZHANG College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In order to reach a compromise between fast response control and torques matching control in double turboshaft engines,research on nonlinear model predictive control for turboshaft engines based on double engines torques matching is conducted.Meanwhile,a Nonlinear Model Predictive Control(NMPC)method is proposed,which combines the control index of the power turbine speed with torques matching of double engines creatively.In addition to the control index,the difference of output torques between each engine is also incorporated in the objective function as a penalty term to ensure constant speed control and short torques matching time.Simulation results demonstrate that relative to unilateral torques matching,the settling time of the bidirectional matching method can be reduced by nearly 30.8%.Nevertheless,compared with the bidirectional torques matching method under the cascade PID controller,the NMPC method can decrease the overshoot of the power turbine speed by 65%and reduce the matching time by 15.5%synchronously.Besides fast response control of turboshaft engines,fast torques matching control of double engines is accomplished as well.

关键词： Double turboshaft engines Fast response control Helicopter Nonlinear model predictive control torques matching method

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Relative Equilibria of a Satellite Moving in an Elliptic Orbit Subjected to Gravitational and Aerodynamic torques

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International Journal of Astronomy and Astrophysics 2014年第1期4卷 221-226页

作者： Kumari Ranjana Department of Mathematics Lakshmibai College University of Delhi New Delhi India

Here we consider the attitude motion of a satellite, subjected to gravitational and aerodynamic torques in an elliptic orbit. The determination of orientation of equilibrium points has been discussed. It is found that they coincide with those for the circular case as studied by Sarychev and others in the works [1]-[3] and besides we have aimed at the sufficient condition for stability in the sense of Lyapunov.

关键词： Satellite Gravitational and Aerodynamic torques Equilibria Condition of Stability

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