The Experts below are selected from a list of 17397 Experts worldwide ranked by ideXlab platform

Takashi Yoneyama - One of the best experts on this subject based on the ideXlab platform.

  • Efficient chaotic based satellite Power supply Subsystem
    Chaos Solitons & Fractals, 2009
    Co-Authors: Luiz Felipe Ramos Turci, Elbert E N Macau, Takashi Yoneyama
    Abstract:

    Abstract In this work, we investigate the use of the Dynamical System Theory to increase the efficiency of the satellite Power supply Subsystems. The core of a satellite Power Subsystem relies on its DC/DC converter. This is a very nonlinear system that presents a multitude of phenomena ranging from bifurcations, quasi-periodicity, chaos, coexistence of attractors, among others. The traditional Power Subsystem design techniques try to avoid these nonlinear phenomena so that it is possible to use linear system theory in small regions about the equilibrium points. Here, we show that more efficiency can be drawn from a Power supply Subsystem if the DC/DC converter operates in regions of high nonlinearity. In special, if it operates in a chaotic regime, is has an intrinsic sensitivity that can be exploited to efficiently drive the Power Subsystem over high ranges of Power requests by using control of chaos techniques.

  • discontinuity induced bifurcations in a piecewise smooth satellite Power Subsystem model
    IFAC Proceedings Volumes, 2009
    Co-Authors: Luiz Felipe Ramos Turci, Elbert E N Macau, Mario Di Bernardo, Takashi Yoneyama
    Abstract:

    Abstract In this work, a simple piecewise-smooth model for satellite Power Subsystem is presented and analyzed. The system presents a multitude of nonlinear phenomena like coexistence of attractors, chaos, and bifurcations induced by discontinuity; analyzed here by applying numeric and analytical approaches.

  • Controlling chaos in a satellite Power supply Subsystem
    The European Physical Journal Special Topics, 2008
    Co-Authors: Elbert E N Macau, L. F. Ramos Turci, Takashi Yoneyama
    Abstract:

    In this work, we show that chaos control techniques can be used to increase the region that can be efficiently used to supply the Power requests for an artificial satellite. The core of a satellite Power Subsystem relies on its DC/DC converter. This is a very nonlinear system that presents a multitude of phenomena ranging from bifurcations, quasi-periodicity, chaos, coexistence of attractors, among others. The traditional Power Subsystem design techniques try to avoid these nonlinear phenomena so that it is possible to use linear system theory in small regions about the equilibrium points. Here, we show that chaos control can be used to efficiently extend the applicability region of the satellite Power Subsystem when it operates in regions of high nonlinearity.

Zhang Ping - One of the best experts on this subject based on the ideXlab platform.

  • Electrical Power Subsystem of CX-1 Micro-Satellite
    Aerospace Shanghai, 2006
    Co-Authors: Zhang Ping
    Abstract:

    The performance,construction,principle,and design and parameters of solar array,Cd-Ni battery and Power controller of the Power Subsystem for CX-1 satellite,which was the first micro-satellite in China,were introduced in this paper.The key technologies such as 3-region control and uniform bus alignment,high efficiency Power generating of 3-node GaAs solar cell,and intelligent control management of charge V-T curve were also analyzed.The on-orbit data showed that the function of the Power Subsystem operated with high performance and reliability which met the requirements in design.

  • R&D of electrical Power Subsystem for the first microsatellite in China
    Chinese Journal of Power Sources, 2005
    Co-Authors: Zhang Ping
    Abstract:

    The technical requirement, design sketch and flight test result of the electrical Power Subsystem (EPS) for the CX-1microsatellite, which is the first microsatellite in China,were introduced in this paper.The EPS with 3-domain regulated busand hardware replaced by software is successful.

Mohamed Zahran - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of Earth Remote Sensing Microsatellite Power Subsystem Capability during Detumbling and Nominal Modes
    2011
    Co-Authors: Mohamed Zahran, Mohamed Elsayed Aly Abd Elaziz Okasha, Galina A. Ivanova
    Abstract:

    The Electric Power Subsystem (EPS) is one of the most critical system on any satellite because nearly every other Subsystem requires Power. This makes the choice of Power systems the most important task facing satellite designers. The main purpose of the Satellite EPS is to provide continuous, regulated and conditioned Power to all the satellite Subsystems. It has to do that withstanding the radiation, thermal cycling, and vacuum of a hostile space environment as well as the Subsystem degradation over the time [1]. The EPS Power characteristics are determined by both the parameters of the system itself and by the satellite orbit RI After the satellite separates from the launch vehicle (LV) to its orbit, in almost situations, all the satellite Subsystems (attitude determination and control, communication, and onboard computer and data handling (OBCD estimation the solar arrays illumination parameters and determination of the efficiency of solar arrays during both detumbling and nominal modes.

  • In Orbit Performance of LEO Satellite Electrical Power Subsystem - SW Package for Modelling and Simulation Based on MatLab.7 GUI
    2006
    Co-Authors: Mohamed Zahran, Cairo Egypt
    Abstract:

    This paper discusses a development software tool for modelling and simulation of satellite electrical Power Subsystem (SEPSMS) in orbit operation analysis. The development of the components database to facilitate the modelling and simulation of the satellite EPS for remote sensing low earth orbit (LEO) application are introduced and some of them are deduced. In particular, the model of orbit estimation and solar array illumination are introduced, the specific output Power of solar array based on GaAs solar cells single junction is presented also. The orbit perturbations and satellite separation from launch vehicle errors are included in the analysis of satellite EPS operation during the lifetime period of satellite. The model of off-nominal operation of the solar array is included in the EPS analysis during the lifetime period. Also the degradation parameters of the different EPS components are considered in the components models. The present work attempts to overcome certain inadequacies of contemporary simulation applications with respect to SEPSMS, by developing mathematical or empirical system modelling schemes for EPS components. These schemes are then integrated within a state-of-the-art simulation environment, so that they can be employed in practice (1). For the purposes of the present work, it was decided to work with a state-of-the-art simulation program based on MatLab.7 Graphical User Interface (GUI). The EPS system parameters is presented in three figures screen grouped as; window of orbit and solar illumination, orbit shadowing period and local time of descending (LTD) , window of solar array output current, load profile and storage battery capacity all of them as a function of time. The third window shows the satellite bus voltage and static pattern of storage battery temperature. The result of the introduced tool is verified by another one for a similar satellite issued by an experienced agency in this field (2), the convergence was very high.

  • assessment of earth remote sensing microsatellite Power Subsystem capability during detumbling and nominal modes
    Journal of Power Electronics, 2006
    Co-Authors: Mohamed Zahran, Mohamed Elsayed Aly Abd Elaziz Okasha, Galina Ivanova
    Abstract:

    The Electric Power Subsystem (EPS) is one of the most critical systems on any satellite because nearly every Subsystem requires Power. This makes the choice of Power systems the most important task facing satellite designers. The main purpose of the Satellite EPS is to provide continuous, regulated and conditioned Power to all the satellite Subsystems. It has to withstand radiation, thermal cycling and vacuums in hostile space environments, as well as Subsystem degradation over time [1]. The EPS Power characteristics are determined by both the parameters of the system itself and by the satellite orbit [2]. After satellite separation from the launch vehicle (LV) to its orbit, in almost all situations, the satellite Subsystems (attitude determination and control, communication and onboard computer and data handling (OBC&DH)), take their needed Power from a storage battery (SB) and solar arrays (SA) besides the consumed Power in the EPS management device. At this point (separation point, detumbling mode), the satellite's angular motion is high and the orientation of the solar arrays, with respect to the Sun, will change in a non-uniform way, so the amount of Power generated by the solar arrays will be affected. The objective of this research is to select satellite EPS component types, to estimate solar array illumination parameters and to determine the efficiency of solar arrays during both detumbling and normal operation modes.

Bilel Neji - One of the best experts on this subject based on the ideXlab platform.

  • Hierarchical Fuzzy-Logic-Based Electrical Power Subsystem for Pico Satellite ERPSat-1
    IEEE Systems Journal, 2015
    Co-Authors: Bilel Neji, Chafaa Hamrouni, Adel M. Alimi, Hiroshi Nakajima, Aslan R. Alim
    Abstract:

    Despite the recent advances in space technologies, electrical Power systems are still challenging researchers developing small satellites for low earth orbit use. In order to supply their Subsystems, these satellites can only use the Power stored onboard from solar energy. Therefore, the electrical Power system should ensure a maximum exploitation of energy sources and should optimize the distribution of the available electrical Power. This paper introduces a new intelligent electrical Power Subsystem for pico satellites. It is based on fuzzy logic and hierarchical fuzzy logic algorithms allowing a faster energy storage and a better and efficient energy distribution. The developed Subsystem is composed of three main blocks, which are the fuzzy maximum Power point tracker, the Power conditioner, and the hierarchical fuzzy Subsystem controller. The intelligent electrical Power Subsystem was successfully integrated in ERPSat-1 pico satellite. Furthermore, the simulations and experimental data of the proposed system have shown better results compared to other architectures used for previous small satellite electrical Power Subsystems.

  • Study and simulation of an intelligent electrical Power Subsystem for ERPSat-1 cube satellite
    Proceedings of 5th International Conference on Recent Advances in Space Technologies - RAST2011, 2011
    Co-Authors: Bilel Neji, Chafaa Hamrouni, Adel M. Alimi
    Abstract:

    With the continuous interest on space technologies development, small satellites especially pico satellites were the focus of universities research in order to demonstrate the use of these vehicles for communication, earth observation, space remote sensing, space exploration, cartography, forest observation, etc. Despite of the new miniaturization technologies, the electrical Power Subsystem still the most critical module in pico satellites which basic tasks are to ensure maximum exploitation of energy sources and optimize the distribution of the available electrical Power. In this context, this paper proposes a novel architecture of an electrical Power Subsystem to be used for ERPSat-1 pico satellite which is under development at the Research Group of Intelligent Machines laboratory in Tunisia. This Subsystem is basically composed of a Fuzzy Maximum Power Point Tracker, a Power conditioner and a hierarchical fuzzy Subsystems controller.

Aslan R. Alim - One of the best experts on this subject based on the ideXlab platform.

  • Hierarchical Fuzzy-Logic-Based Electrical Power Subsystem for Pico Satellite ERPSat-1
    IEEE Systems Journal, 2015
    Co-Authors: Bilel Neji, Chafaa Hamrouni, Adel M. Alimi, Hiroshi Nakajima, Aslan R. Alim
    Abstract:

    Despite the recent advances in space technologies, electrical Power systems are still challenging researchers developing small satellites for low earth orbit use. In order to supply their Subsystems, these satellites can only use the Power stored onboard from solar energy. Therefore, the electrical Power system should ensure a maximum exploitation of energy sources and should optimize the distribution of the available electrical Power. This paper introduces a new intelligent electrical Power Subsystem for pico satellites. It is based on fuzzy logic and hierarchical fuzzy logic algorithms allowing a faster energy storage and a better and efficient energy distribution. The developed Subsystem is composed of three main blocks, which are the fuzzy maximum Power point tracker, the Power conditioner, and the hierarchical fuzzy Subsystem controller. The intelligent electrical Power Subsystem was successfully integrated in ERPSat-1 pico satellite. Furthermore, the simulations and experimental data of the proposed system have shown better results compared to other architectures used for previous small satellite electrical Power Subsystems.