The Experts below are selected from a list of 105420 Experts worldwide ranked by ideXlab platform
Hyunsoo Kim - One of the best experts on this subject based on the ideXlab platform.
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Analysis of a Regenerative Braking System for a Hybrid Electric Vehicle Using Electro-Mechanical Brakes
'IntechOpen', 2021Co-Authors: Sung-ho Hwang, Hyunsoo Kim, Donghyun Kim, Kihwa JungAbstract:In this paper, the Performance simulation for a hybrid electric vehicle equipped with an EMB system was conducted. A Performance Simulator and dynamics models were developed to include such subsystems as the engine, the motor, the battery, AMT, and EMB. The EMB control algorithm that applied the PID control technique was constructed based on cascade control loops composed of the current, velocity, and force control systems. The simulation results for FUDS mode showed that the HEV equipped with an EMB system can regenerate the braking energy by using the proposed regenerative braking control algorithm
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development of brake system and regenerative braking cooperative control algorithm for automatic transmission based hybrid electric vehicles
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Jiweon Ko, Sungyeon Ko, Byoungsoo Yoo, Jae Seung Cheon, Hanho Son, Hyunsoo KimAbstract:In this paper, a brake system for an automatic transmission(AT)-based hybrid electric vehicle (HEV) is developed, and a regenerative braking cooperative control algorithm is proposed, with consideration of the characteristics of the brake system. The brake system does not require a pedal Simulator or a fail-safe device, because a hydraulic brake is equipped on the rear wheels, and an electronic wedge brake (EWB) is equipped on the front wheels of the vehicle. Dynamic models of the HEV equipped with the brake system developed in this study are obtained, and a Performance Simulator is developed. Furthermore, a regenerative braking cooperative control algorithm, which can increase the regenerative braking energy recovery, is suggested by considering the characteristics of the proposed hydraulic brake system. A simulation and a vehicle test show that the brake system and the regenerative braking cooperative control algorithm satisfy the demanded braking force by performing cooperative control between regenerative braking and friction braking. The regenerative braking cooperative control algorithm can increase energy recovery of the regenerative braking by increasing the gradient of the demanded braking force against the pedal stroke. The gradient of the demanded braking force needs to be determined with consideration of the driver's braking characteristics, regenerative braking energy, and the driving comfort.
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A Study on In-wheel Motor Control to Improve Vehicle Stability Using Human-in-the-Loop Simulation
Journal of Power Electronics, 2013Co-Authors: Sang-moon Lee, Jae Seung Cheon, Hyunsoo KimAbstract:In this study, an integrated motor control algorithm for an in-wheel electric vehicle is suggested. It consists of slip control that controls the in-wheel motor torque using the road friction coefficient and slip ratio; yaw rate control that controls the in-wheel motor torque according to the road friction coefficient and the yaw rate error; and velocity control that controls the vehicle velocity by a weight factor based on the road friction coefficient and the yaw rate error. A co-Simulator was developed, which combined the vehicle Performance Simulator based on MATLAB/Simulink and the vehicle model of CarSim. Based on the co-Simulator, a human-in-the-loop simulation environment was constructed, in which a driver can directly control the steering wheel, the accelerator pedal, and the brake pedal in real time. The Performance of the integrated motor control algorithm for the in-wheel electric vehicle was evaluated through human-in-the-loop simulations.
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original article modeling and simulation for a tractor equipped with hydro mechanical transmission
바이오시스템공학(구 한국농업기계학회지), 2013Co-Authors: Seokhwan Choi, Hyoungjin Kim, Sung Hyun Ahn, Sung Hwa Hong, Min Jae Chai, Oh Eun Kwon, Soo Chul Kim, Yongjoo Kim, Chang Hyun Choi, Hyunsoo KimAbstract:Purpose: A Simulator for the design and Performance evaluation of a tractor with a hydro-mechanical transmission (HMT) was developed. Methods: The HMT consists of a hydro-static unit (HSU), a swash plate control system, and a planetary gear. It was modeled considering the input/output relationship of the torque and speed, and efficiency of HSU. Furthermore, a dynamic model of a tractor was developed considering the traction force, running resistance, and PTa (power take off) output power, and a tractor Performance Simulator was developed in the co-simulation environment of AMESim and MATLAB/Simulink. Results: The behaviors of the design parameters of the HMT tractor in the working and driving modes were investigated as follows; For the stepwise change of the drawbar load in the working mode, the tractor and engine speeds were maintained at the desired values by the engine torque and HSU stroke control. In the driving mode, the tractor followed the desired speed through the control of the engine torque and HSU stroke. In this case, the engine operated near the OOL (optimal operating line) for the minimum fuel consumption within the shift range of HMT. Conclusions: A Simulator for the HMT tractor was developed. The simulations were conducted under two operation conditions. It was found that the tractor speed and the engine speed are maintained at the desired values through the control of the engine torque and the HSU stroke.
Hyuk Park - One of the best experts on this subject based on the ideXlab platform.
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a generic level 1 Simulator for spaceborne gnss r missions and application to geros iss ocean reflectometry
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2017Co-Authors: Hyuk Park, Adriano Camps, Jorge Querol, Raul Onrubia, Yujin Kang, D Pascual, A AlonsoarroyoAbstract:In the past decade Global Navigation Satellites System Reflectometry (GNSS-R) has emerged as a new technique for earth remote sensing for various applications, such as ocean altimetry and sea state monitoring. After the success of the GNSS-R demonstrator payloads aboard the UK-DMC or TDS-1 satellites; at present, there are several missions planned to carry GNSS reflectometers. The GNSS rEflectometry, Radio Occultation, and Scatterometry onboard International Space Station (GEROS-ISS) is an innovative ISS experiment exploiting GNSS-R technique to measure key parameters of ocean, land, and ice surfaces. For GEROS-ISS mission, the European Space Agency (ESA) supported the study of GNSS-R assessment of requirements and consolidation of retrieval algorithms (GARCA). For this, it was required to accurately simulate the GEROS-ISS measurements including the whole range of parameters affecting the observation conditions and the instrument, which is called GEROS-SIM. To meet these requirements, the PAU/PARIS end-to-end Performance Simulator (P $^{2}$ EPS) previously developed by UPC BarcelonaTech was used as the baseline building blocks for the level 1 (L1) processor of GEROS-SIM. P $^{2}$ EPS is a flexible tool, and is capable of systematically simulating the GNSS-R observations for spaceborne GNSS-R missions. Thanks to the completeness and flexibility, the instrument-to-L1 data module of GEROS-SIM could be implemented by proper modification and update of P $^{2}$ EPS. The developed GEROS-SIM was verified and validated in the GARCA study as comparing to the TDS-1 measurements. This paper presents the design, implementation, and results of the GEROS-SIM L1 module in a generic way to be applied to GNSS-R instruments.
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A generic level 1 Simulator for spaceborne GNSS-R missions and application to GEROS-ISS ocean reflectometry
'Institute of Electrical and Electronics Engineers (IEEE)', 2017Co-Authors: Hyuk Park, Camps Carmona, Adriano José, Pascual Biosca Daniel, Kang Yujin, Onrubia Ibáñez Raúl, Querol Borràs Jorge, Alonso Arroyo AlbertoAbstract:©2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In the past decade Global Navigation Satellites System Reflectometry (GNSS-R) has emerged as a new technique for earth remote sensing for various applications, such as ocean altimetry and sea state monitoring. After the success of the GNSS-R demonstrator payloads aboard the UK-DMC or TDS-1 satellites; at present, there are several missions planned to carry GNSS reflectometers. The GNSS rEflectometry, Radio Occultation, and Scatterometry onboard International Space Station (GEROS-ISS) is an innovative ISS experiment exploiting GNSS-R technique to measure key parameters of ocean, land, and ice surfaces. For GEROS-ISS mission, the European Space Agency (ESA) supported the study of GNSS-R assessment of requirements and consolidation of retrieval algorithms (GARCA). For this, it was required to accurately simulate the GEROS-ISS measurements including the whole range of parameters affecting the observation conditions and the instrument, which is called GEROS-SIM. To meet these requirements, the PAU/PARIS end-to-end Performance Simulator (P$^{2}$EPS) previously developed by UPC BarcelonaTech was used as the baseline building blocks for the level 1 (L1) processor of GEROS-SIM. P$^{2}$EPS is a flexible tool, and is capable of systematically simulating the GNSS-R observations for spaceborne GNSS-R missions. Thanks to the completeness and flexibility, the instrument-to-L1 data module of GEROS-SIM could be implemented by proper modification and update of P$^{2}$EPS. The developed GEROS-SIM was verified and validated in the GARCA study as comparing to the TDS-1 measurements. This paper presents the design, implementation, and results of the GEROS-SIM L1 module in a generic way to be applied to GNSS-R instruments.Peer Reviewe
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improvement of pau paris end to end Performance Simulator p 2 eps land scattering including topography
International Geoscience and Remote Sensing Symposium, 2016Co-Authors: Hyuk Park, Adriano Camps, Daniel Pascual, Jorge Querol, A Alonsoarroyo, Raul OnrubiaAbstract:This work presents an improvement of the P2EPS end-to-end Simulator to assess the Performances of Global Navigation Satellite System Reflectometry (GNSS-R) space missions over land. Beyond the single specular reflection model, topography effects are included. In order to avoid the computational burden of facet approach based on the bi-static radar model, the Phong reflection model is employed. By calculating the delay, Doppler frequency, and relative intensity of scattered points, the topography effects can be accounted for as a sort of impulse response in the delay, and Doppler domains to be convolved with the Woodward Ambiguity function.
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microwave imaging radiometers by aperture synthesis Performance Simulator part 2 instrument modeling calibration and image reconstruction algorithms
Journal of Imaging, 2016Co-Authors: Adriano Camps, Hyuk Park, Jorge Bandeiras, Jose Barbosa, Yujin Kang, Paula Vieira, Ana Friacas, Salvatore DaddioAbstract:The Synthetic Aperture Interferometric Radiometer Performance Simulator (SAIRPS) has been a three-year project sponsored by the European Space Agency (ESA) to develop a completely generic end-to-end Performance Simulator of arbitrary synthetic aperture interferometric radiometers. In a companion manuscript (Part I), the Radiative Transfer Module used to generate synthetic fully polarimetric brightness temperatures from 1 to 100 GHz, including land and ocean covers, as well as the atmosphere, is described in detail. In this manuscript (Part II), the instrument model, the calibration procedure, and the imaging algorithms are described. The instrument model includes the simulation of the array topology in terms of the number of antenna elements, the time-dependent position and orientation, and the arbitrary receivers’ topology which can be modified from a very generic one by connecting and disconnecting subsystems. All the parameters can be, one by one, defined either by mathematical functions or by input data files, including the frequency and temperature dependence. Generic calibration algorithms including an external point source, the flat target transformation, and the two-level correlated noise injection are described. Finally, different image reconstruction algorithms suitable for arbitrary array topologies have also been implemented and tested. Simulation results have been validated and selected results are presented.
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microwave imaging radiometers by aperture synthesis Performance Simulator part 1 radiative transfer module
Journal of Imaging, 2016Co-Authors: Adriano Camps, Hyuk Park, Jorge Bandeiras, Jose Barbosa, Ana Sousa, Salvatore Daddio, Manuel MartinneiraAbstract:The Synthetic Aperture Interferometric Radiometer Performance Simulator (SAIRPS) is a three-year project sponsored by the European Space Agency (ESA) to develop a completely generic end-to-end Performance Simulator of arbitrary synthetic aperture interferometric radiometers. This means, on one side, a generic radiative transfer module from 1 to 100 GHz, including land and ocean covers, as well as a fully 3D atmosphere and Faraday ionospheric rotation based on variable TEC. On the other hand, the instrument can have an arbitrary array topology (number of antenna elements, and their time-dependent position and orientation). Receivers’ topology can also be modified, starting from a very generic one to connecting and disconnecting subsystems, whose parameters can be individually configured. These parameters can be defined either by mathematical functions or by input data files, including the frequency and temperature dependence. Generic calibration and image reconstruction algorithms that are suitable for arbitrary array topologies have also been implemented, as well as tools to compute the instrument Performance metrics, i.e., radiometric accuracy, sensitivity, angular resolution, etc. This manuscript presents the generic architecture of the SAIRPS, the algorithms implemented in the Radiative Transfer Module, and simulation results showing its Performance. A companion manuscript (Part II) describes the instrument and calibration modelling, the image reconstruction algorithms, and the validation tests that were performed.
A Alonsoarroyo - One of the best experts on this subject based on the ideXlab platform.
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a generic level 1 Simulator for spaceborne gnss r missions and application to geros iss ocean reflectometry
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2017Co-Authors: Hyuk Park, Adriano Camps, Jorge Querol, Raul Onrubia, Yujin Kang, D Pascual, A AlonsoarroyoAbstract:In the past decade Global Navigation Satellites System Reflectometry (GNSS-R) has emerged as a new technique for earth remote sensing for various applications, such as ocean altimetry and sea state monitoring. After the success of the GNSS-R demonstrator payloads aboard the UK-DMC or TDS-1 satellites; at present, there are several missions planned to carry GNSS reflectometers. The GNSS rEflectometry, Radio Occultation, and Scatterometry onboard International Space Station (GEROS-ISS) is an innovative ISS experiment exploiting GNSS-R technique to measure key parameters of ocean, land, and ice surfaces. For GEROS-ISS mission, the European Space Agency (ESA) supported the study of GNSS-R assessment of requirements and consolidation of retrieval algorithms (GARCA). For this, it was required to accurately simulate the GEROS-ISS measurements including the whole range of parameters affecting the observation conditions and the instrument, which is called GEROS-SIM. To meet these requirements, the PAU/PARIS end-to-end Performance Simulator (P $^{2}$ EPS) previously developed by UPC BarcelonaTech was used as the baseline building blocks for the level 1 (L1) processor of GEROS-SIM. P $^{2}$ EPS is a flexible tool, and is capable of systematically simulating the GNSS-R observations for spaceborne GNSS-R missions. Thanks to the completeness and flexibility, the instrument-to-L1 data module of GEROS-SIM could be implemented by proper modification and update of P $^{2}$ EPS. The developed GEROS-SIM was verified and validated in the GARCA study as comparing to the TDS-1 measurements. This paper presents the design, implementation, and results of the GEROS-SIM L1 module in a generic way to be applied to GNSS-R instruments.
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improvement of pau paris end to end Performance Simulator p 2 eps land scattering including topography
International Geoscience and Remote Sensing Symposium, 2016Co-Authors: Hyuk Park, Adriano Camps, Daniel Pascual, Jorge Querol, A Alonsoarroyo, Raul OnrubiaAbstract:This work presents an improvement of the P2EPS end-to-end Simulator to assess the Performances of Global Navigation Satellite System Reflectometry (GNSS-R) space missions over land. Beyond the single specular reflection model, topography effects are included. In order to avoid the computational burden of facet approach based on the bi-static radar model, the Phong reflection model is employed. By calculating the delay, Doppler frequency, and relative intensity of scattered points, the topography effects can be accounted for as a sort of impulse response in the delay, and Doppler domains to be convolved with the Woodward Ambiguity function.
Bernard Normand - One of the best experts on this subject based on the ideXlab platform.
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a coupling approach between metallic bipolar plates corrosion and membrane chemical degradation in the proton exchange membrane fuel cells
International Journal of Hydrogen Energy, 2021Co-Authors: I Elferjani, G Serre, B Terovanessian, Bernard NormandAbstract:Abstract The Nafion membrane's chemical degradation by the Fenton mechanism involves the presence of ferrous ions Fe2+ but the detrimental concentration is not well known. These ions could be generated either from the balance of plant or from the bipolar plates' corrosion. As an attempt to describe the link between the two mechanisms, the membrane's degradation and the bipolar plates' corrosion were investigated. Our work is based on experimental and modelling approaches. We start with a parametric corrosion study allowing the determination of the Fe2+ flux using a Look-Up Table. The second step is the modelling of the Fe2+ effect on the membrane degradation. The third is the modelling of ionic species transport between the bipolar plates and the membrane. The final coupled degradation model is implemented in a PEMFC Performance Simulator based on the Matlab/Simulink® platform. The model is used to simulate the degradation mechanism during NEDC (New European Driving Cycle).
Jiweon Ko - One of the best experts on this subject based on the ideXlab platform.
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development of brake system and regenerative braking cooperative control algorithm for automatic transmission based hybrid electric vehicles
IEEE Transactions on Vehicular Technology, 2015Co-Authors: Jiweon Ko, Sungyeon Ko, Byoungsoo Yoo, Jae Seung Cheon, Hanho Son, Hyunsoo KimAbstract:In this paper, a brake system for an automatic transmission(AT)-based hybrid electric vehicle (HEV) is developed, and a regenerative braking cooperative control algorithm is proposed, with consideration of the characteristics of the brake system. The brake system does not require a pedal Simulator or a fail-safe device, because a hydraulic brake is equipped on the rear wheels, and an electronic wedge brake (EWB) is equipped on the front wheels of the vehicle. Dynamic models of the HEV equipped with the brake system developed in this study are obtained, and a Performance Simulator is developed. Furthermore, a regenerative braking cooperative control algorithm, which can increase the regenerative braking energy recovery, is suggested by considering the characteristics of the proposed hydraulic brake system. A simulation and a vehicle test show that the brake system and the regenerative braking cooperative control algorithm satisfy the demanded braking force by performing cooperative control between regenerative braking and friction braking. The regenerative braking cooperative control algorithm can increase energy recovery of the regenerative braking by increasing the gradient of the demanded braking force against the pedal stroke. The gradient of the demanded braking force needs to be determined with consideration of the driver's braking characteristics, regenerative braking energy, and the driving comfort.
