With the ongoing advancement of the Internet of Things (IoT) and the daily accumulation of substantial data within systems, the implementation of access control emerges as a critical mechanism to safeguard data privac...
详细信息
The mitigation of fuel propellant sloshing on-board satellites or during space launches is of particular interest. Fuel sloshing can indeed significantly affect spacecraft motion by increasing the maneuver settling ti...
详细信息
ISBN:
(数字)9781665473385
ISBN:
(纸本)9781665473385
The mitigation of fuel propellant sloshing on-board satellites or during space launches is of particular interest. Fuel sloshing can indeed significantly affect spacecraft motion by increasing the maneuver settling time and occasionally destabilizing them. This paper presents a novel, model-free attitude control approach that actively compensates for the sloshing disturbance. One of the main novelties consists of using pressure sensors inside the fuel tank to measure a quantity proportional to the sloshing torque. Then, using this measurement, an attitude controller can be designed not only to reject the sloshing torque but also to keep the fuel sloshing within acceptable conditions. Technically speaking, this is achieved by combining model-free control with an output to input saturation transformation (OIST) add-on.
PID controllers represent the most frequently used feedback structure, especially in industrial applications. With an appropriate design of the individual controller parameters, they guarantee both stability and a goo...
详细信息
ISBN:
(数字)9781665473385
ISBN:
(纸本)9781665473385
PID controllers represent the most frequently used feedback structure, especially in industrial applications. With an appropriate design of the individual controller parameters, they guarantee both stability and a good transient behavior, and they offer a clearly interpretable structure. Problems may arise in safety-critical applications, especially if the real system is subject to model uncertainty. In this paper, a model-based PID controller is considered for the power control of a solid oxide fuel cell, where safety aspects are highly relevant. Two alternative design models, a linear model and a nonlinear Hammerstein model, are used for the control design. For both models, a PID controller parametrization is determined that meets robust performance specifications using a multiplicative output uncertainty description. Simulation results point out the benefits of the nonlinear structure based on the Hammerstein model.
The task of semantic segmentation of urban scenes in remote sensing has extensive applications in land cover mapping, urban change detection, and environmental protection. However, due to the significant intra-class h...
详细信息
This paper presents an integral sliding mode controller (ISMC) that can handle matched and unmatched uncertainties present in singularly perturbed nonlinear systems. Fast sensor dynamics in series with the plant are e...
详细信息
ISBN:
(数字)9781665473385
ISBN:
(纸本)9781665473385
This paper presents an integral sliding mode controller (ISMC) that can handle matched and unmatched uncertainties present in singularly perturbed nonlinear systems. Fast sensor dynamics in series with the plant are explored as study case. By incorporating the knowledge of the given sensor dynamics into the SMC design and appropriate parameters tuning of the proposed controller, the main result shows that the closed loop system can converge to a small neighborhood of the origin. More precisely, by selecting a sliding surface with a convergence time constant even smaller than the time constant governing the sensor dynamics, the closed loop system is shown to be semi-globally practically input-to-state stable. Simulation results on Maglev model are presented to show the effectiveness of the proposed approach.
Under the background of dual carbon goals and energy Internet construction, new energy is booming, which also brings high uncertainty to the operation dispatching and optimal control of the new power system. This pape...
详细信息
ISBN:
(纸本)9798350375145;9798350375138
Under the background of dual carbon goals and energy Internet construction, new energy is booming, which also brings high uncertainty to the operation dispatching and optimal control of the new power system. This paper mainly reviews the artificial intelligence large model technology and its future applications in power system operation and regulation. Firstly, the demand for AI in the new power system and the current application status of AI large model technology in the power field were summarized. Then, multimodal large model technology was introduced, and the technical path of AI large model adaptation in vertical industries was explored. Finally, the application of AI large models in the operation and regulation of new power systems is discussed from the dimensions of source-transmission-distribution-usage-equipment, providing reference for the theory of power grid operation and regulation based on large models.
Video target detection technology has made significant progress in recent years. However, in the face of low-quality video targets, traditional computer vision methods are limited by unclear features or missing inform...
详细信息
The rapid development of new communication applications such as virtual reality and video conferencing has brought new challenges to congestion control algorithms. In particular, these applications have specific requi...
详细信息
Intelligent reflecting surfaces (IRSs), which are 2-D structures comprising numerous unit cells, have emerged as one of the pivotal technologies for the sixth generation (6G) of wireless communication networks. By dyn...
详细信息
ISBN:
(纸本)9798350379808;9798350379792
Intelligent reflecting surfaces (IRSs), which are 2-D structures comprising numerous unit cells, have emerged as one of the pivotal technologies for the sixth generation (6G) of wireless communication networks. By dynamically tuning the amplitude and phase shift of each unit cell, IRSs provide an opportunity to reshape and control the reflective wave. For this reason, we can convert propagation environment into part of the network design parameters that are subject to optimization. In this paper, we presents design of an IRS using spidron structure for 6G applications. Firstly, we provide requirements of designing a new IRS in three key metrics, including unit-cell size, number of unit cell states, and IRS panel size. And then, a genetic algorithm is used for calculating the desired beam directions which are engineered with the proper phase states of each unit cell. Subsequently, a novel spidron structure is designed for 2-bit unit cell of IRS with size of 0.33 lambda x 0.33 lambda at 2.6 GHz. Thank to spidron shape, the features of IRS include light weight, wide scanning angle, and high scan resolution. For demonstration, an IRS panel with 34 x 10 cells are computationally investigated and the simulations result in a scan resolution of 10 degrees and scan angle up to +/- 60 degrees with peak gain of 22.6 dBi.
In this paper, a new independent DC microgrid hybrid energy storage system is designed, which uses a 16/18/16-type double-stator switched reluctance motor as a wind turbine generator, and in order to realise the fluct...
详细信息
暂无评论