Bucket-Wheel excavators (BWE) represent a specific type of complex machine system used in mining technology. During operation, the system is exposed to a number of external forces and disturbances like digging resista...
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Bucket-Wheel excavators (BWE) represent a specific type of complex machine system used in mining technology. During operation, the system is exposed to a number of external forces and disturbances like digging resista...
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A discussion on the issues and challenges of wind turbine dynamics and control was presented. The need for designers to find a control strategy that is a robust compromise between modeling and measurement complexity a...
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A discussion on the issues and challenges of wind turbine dynamics and control was presented. The need for designers to find a control strategy that is a robust compromise between modeling and measurement complexity and system performance vis-a-vis the primary control objectives was highlighted. The technical progress in dynamic modeling of wind turbines was also discussed.
The chemical reactor or bioreactor is physically at a central position in a process, and often with a decisive role on the overall technical and economical performance. Even though application of feedback control on r...
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The chemical reactor or bioreactor is physically at a central position in a process, and often with a decisive role on the overall technical and economical performance. Even though application of feedback control on reactors is gaining momentum and on-line optimization has been implemented in industry, many reactor control problems are still left unsolved or only partly solved using open loop strategies where disturbance rejection and model inaccuracies have to be handled through manual reactor control and feedback control of raw material preprocessing and product purification operations. For bioreactors the theory and practice of reactor design, dynamics and control have to be adapted to the peculiarities of the biological catalysts. Enzymes, the protein catalysts, are the simplest ones, which have many common features with chemical catalysts. The living cells are much more complex, these growing and adaptive catalysts present several challenging control problems. This survey deals with recent progress in model based control of reactors and with underlying modelling, identification and dynamical aspects. Of the large variety of reactors the survey touches upon progress in control of a few types, with the main focus on the industrially important fixed bed reactor, batch, fed batch and continuous bioreactors.
The Butterfly eVTOL aircraft configuration includes four tilting propellers based on Optimum Speed Tilt Rotor technology. The propellers have the ability to operate over a wide range of rotor speeds and therefore gene...
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With the rapid development of artificial intelligence,the data-driven methods have been extensively applied in the fields of machinery, power, civil engineering, transportation and other industries, such as fault diag...
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Multibody system dynamics provides a strong tool for the estimation of dynamic performances and the optimization of multisystem robot design. It can be described with differential algebraic equations(DAEs). In this pa...
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Multibody system dynamics provides a strong tool for the estimation of dynamic performances and the optimization of multisystem robot design. It can be described with differential algebraic equations(DAEs). In this paper, a particle swarm optimization(PSO) method is introduced to solve and control a symplectic multibody system for the first time. It is first combined with the symplectic method to solve problems in uncontrolled and controlled robotic arm systems. It is shown that the results conserve the energy and keep the constraints of the chaotic motion, which demonstrates the efficiency, accuracy, and time-saving ability of the method. To make the system move along the pre-planned path, which is a functional extremum problem, a double-PSO-based instantaneous optimal control is introduced. Examples are performed to test the effectiveness of the double-PSO-based instantaneous optimal control. The results show that the method has high accuracy, a fast convergence speed, and a wide range of *** the above verify the immense potential applications of the PSO method in multibody system dynamics.
＜正＞The flexible multi-link grasp manipulators have been widely used in many spacecrafts to capture and moving objects according to the planed *** grasp manipulator will show very complex coupling dynamic features i...
＜正＞The flexible multi-link grasp manipulators have been widely used in many spacecrafts to capture and moving objects according to the planed *** grasp manipulator will show very complex coupling dynamic features in the process of capture and moving *** this work,the flexible multi-link grasp manipulator installed on a satellite is described via the Absolute Coordinate Based（ACB） method that combines the Natural Coordinate Formulation（NCF） describing rigid bodies and the Absolute Noda Coordinate Formulation（ANCF） describing flexible *** grasp manipulator hand is modeled by four rigid bodies,that is,one arm and three fingers which are installed on the manipulator flexible end arm.A new
Wind turbine systems present several challenging issues for control engineers charged with the design of practical controllers. The dynamics of wind turbines are essentially non-linear because of the fundamental physi...
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Wind turbine systems present several challenging issues for control engineers charged with the design of practical controllers. The dynamics of wind turbines are essentially non-linear because of the fundamental physics governing the aerodynamic forces that drive the turbine blades and provide the means of control of the rotor. Given the more advanced dynamic modeling capability now available, more advanced control system development is underway. Such advanced controllers, will offer the significant advantage of reduced operating loads while maintaining nearly optimal energy capture. This improved control performance is likely to allow progressively larger wind turbines to economically compete with other more conventional energy production technologies.
Small celestial body exploration is of great significance to deep space activities. The dynamics and control of orbits around small celestial bodies is of top priority in the exploration research. It includes the mode...
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Small celestial body exploration is of great significance to deep space activities. The dynamics and control of orbits around small celestial bodies is of top priority in the exploration research. It includes the modeling of dynamics environment and the orbital dynamics mechanism. This paper introduced state-ofthe-art researches, major challenges, and future trends in this field. Three topics are mainly discussed： the gravitational field modeling of irregular-shaped small celestial bodies, natural orbital dynamics and control, and controlled orbital dynamics. Finally, constructive suggestions are made for China’s future space exploration missions.
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