As aerospace technology continues to develop, more and more companies and institutions are launching their own satellite constellations, forming heterogeneous satellite networks in space controlled by different users....
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ISBN:
(纸本)9798400709760
As aerospace technology continues to develop, more and more companies and institutions are launching their own satellite constellations, forming heterogeneous satellite networks in space controlled by different users. Due to the satellites being heterogeneous and controlled by different entities, it is difficult to establish a mechanism for collaborative mission planning, leading to a waste of satellite resources. Addressing this issue, this paper begins with the interests of different controlling users as a starting point. Firstly, a cooperative game theory model with controlling users as participants is constructed. Taking into account the characteristics and constraints of the multiple satellite collaborative mission planning problem, a characteristic function for the cooperative game model is designed. Subsequently, a solution framework for the cooperative game model based on the core and a hybrid particle swarm optimization algorithm is proposed. A hybridparticleswarmalgorithm that integrates a genetic algorithm crossover operator and hill-climbing strategy is designed. Moreover, to address the issue that coalitions may not always have a core, an algorithm for finding coalitions that do have a core is devised. Finally, a series of experiments are designed to verify the effectiveness of the model and algorithm. Simulation results show that the cooperative game model can allocate tasks and profits effectively, thereby establishing a robust collaborative mission planning mechanism among multiple heterogeneous agile satellites. Furthermore, by comparing with the traditional particleswarmoptimizationalgorithm, the effectiveness of the proposed hybridparticleswarmalgorithm is demonstrated.
Optimal placement and size of shunt capacitors in the distribution systems play an important role for improving voltage profile and reducing the system power losses and the cost of reactive power optimization. In this...
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ISBN:
(纸本)9781467390637
Optimal placement and size of shunt capacitors in the distribution systems play an important role for improving voltage profile and reducing the system power losses and the cost of reactive power optimization. In this paper, a new effective and powerful optimizationalgorithm is introduced to solve the locations and sizing problems of capacitor banks in various distribution systems satisfying the operation constraints. A novel hybridparticleswarm (HPSO) with Quasi-Newton (QN) algorithm is proposed for this purpose. First the loss sensitivity analysis with two methods is employed to select the most appropriate candidate capacitor placement. Then a novel hybridparticleswarmoptimization (HPSO) algorithm is implemented to find optimal sizing of capacitors and their sittings from the selected buses. The proposed algorithm has been tested on different test systems as 15-bus, and 34-bus IEEE standard radial distribution systems. In order to validate the proposed approach, the obtained results have been compared with other algorithms. In addition, the proposed methodology is applied on practical case study of Moscow region, which consists of 111-bus system. The numerical results have been proved the capability of the proposed approach to find the optimal solutions with system losses reduction, voltage profile improvement and power factor correction. Numerical results have been obtained by MATLAB package.
The existing available research outcomes on vibration attenuation control for time-delay feedback indicate that, for the delay dynamic vibration absorber with fixed time-delay control parameters, under harmonic excita...
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The existing available research outcomes on vibration attenuation control for time-delay feedback indicate that, for the delay dynamic vibration absorber with fixed time-delay control parameters, under harmonic excitation, a good vibration attenuation control effect occurs on the vibration of the main system. However, the effect is not obvious for complex excitation. Aiming at the above problems, in a short time interval, a harmonic excitation with the same displacement size as the complex excitation was established. Then, by calculating its equivalent amplitude and equivalent frequency, a harmonic equivalent method for complex excitation was proposed in this paper. The time-delay parameters were adjusted according to the equivalent frequency of harmonic equivalent excitation in real time;therefore, a good vibration attenuation control effect was obtained through the delay dynamic vibration absorber in the discrete time interval. In this paper, research on a time-varying delay dynamic vibration absorber was conducted by taking the two-degree-of-freedom vibration system with a delay dynamic vibration absorber as an example. The simulation results show that the proposed control method can reduce the vibration of the main system by about 30% compared with the passive vibration absorber. This can obviously improve the performance of the time-delay dynamic vibration absorber. It provides a new technical idea for the design of vehicle active frame system.
Production scheduling can improve economic benefits, reduce costs and energy consumption, and promote the sustainable development of enterprises, which is one of the research hotspots in the field of computer integrat...
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Production scheduling can improve economic benefits, reduce costs and energy consumption, and promote the sustainable development of enterprises, which is one of the research hotspots in the field of computer integration in the past few decades. With the progress of science, enterprises are increasingly demanding production scheduling. The research and application of effective scheduling methods and optimization techniques have important theoretical and practical *** to the requirements of the enterprise's own interests, the strict constraints of delivery date, the pressure of cost and work efficiency, the effective utilization of resources, the problem of reducing waste, etc., it is particularly important for the enterprise to formulate a set of good and effective production scheduling.
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