Power managements of a hybrid electric propulsion system for UAVs

이보화,박부민,김춘택,양수석,안석민 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.8

Power managements of a UAV’s hybrid electric propulsion systems are described. Three electric propulsion systems with different power sources, i.e. solar cells, fuel cells, and batteries are considered. Each power source is modeled in Matlab/Simulink and integrated into the power system. For fuel cells and batteries, the simulation process is verified via comparison between the simulation results and available flight test results of UAVs. Two types of power control logics are investigated: passive and active. The passive power management simulation shows that the behavior of each power source and its integrated system is adequate for the overall flight envelope. In addition, the active power management simulation demonstrates that active power management yields more efficient power distribution and better system safety than passive power management does. Also, a power simulation of a hybrid electric power system allows for estimation of the output behavior of the power source. Therefore, it can be a valuable tool for development of a power control logic that ensures efficient power distribution.

Test Platform Development of Vessel’s Power Management System Using Hardware-in-the-Loop Simulation Technique

Sang-Jung Lee,Sang-Kyu Kwak,Sang-Hyun Kim,Hyung-Jun Jeon,Jee-Hoon Jung 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.6

A PMS (Power Management System) controls vessel"s power systems to improve the system efficiency and to protect a blackout condition. The PMS should be developed with considering the type and the capacity of the vessel’s power system. It is necessary to test the PMS functions developed for vessel’s safe operations under various sailing situations. Therefore, the function tests in cooperation with practical power systems are required in the PMS development. In this paper, a hardware-in-the-loop (HIL) simulator is developed for the purposes of the PMS function tests. The HIL simulator can be more cost-effective, more time-saved, easier to reproduce, and safer beyond the normal operating range than conventional off-line simulators, especially at early stages in development processes or during fault tests. Vessel"s power system model is developed by using a MATLAB/SIMULINK software and by communicating between an OPAL-RT’s OP5600 simulator. The PMS uses a Modbus communication protocol implemented using LabVIEW software. Representative tests of the PMS functions are performed to verify the validity of the proposed HIL-based test platform.

시뮬레이션을 이용한 함정 통합전력시스템의 서비스품질(QoS) 분석

박영만,김소연,박한웅 대한설비관리학회 2023 대한설비관리학회지 Vol.28 No.1

Recently, power demand for naval ships has been steadily increasing due to the increase in power of electronic equipment, computers, and power-based weapons systems and high-power new weapons. An integrated power system(IPS) that manages the power supply most appropriate to the demand for power required by naval ships should have the ability to overcome problems such as power outages and failures. In this study, a method of analyzing the impact of the naval ship power system using simulations was presented, and a quality of service(QoS) analysis study was conducted on the proposed power system. While changing the MTBF of each component of IPS of naval ships, the system MTBF according to the two generator operation strategies was calculated, and the QoS of the power system was analyzed and the results were presented.

파워스티어링 시스템 종류에 따른 차량연비 개선 효과

위효성(Hyoseong Wi),조근진(Geunjin Jo),박진일(Jinil Park),박경석(Kyoungseok Park),이종화(Jonghwa Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

This paper focuses on fuel economy improvement according to types of power steering system. Usually, conventional power steering system is directly driven by the crankshaft of engine with belt. But there's some inefficiency in high engine speed range. To improve this inefficiency automobile makers develops new power steering systems, a motor driven hydraulic power steering system and a full electric power steering system. However there's insufficient study about effects of type of power steering system on fuel economy. In this paper, researches are performed on effect of type of power steering system on fuel economy by experiment. And it is also calculated the effect on vehicle fuel economy using computer simulation with AVL cruise software. As a result, 1% of vehicle fuel economy improvement can be achieved in a vehicle with motor driven hydraulic power steering system compared to a vehicle with conventional power steering system. In addition 1.7% of vehicle fuel economy improvement can be achieved using full electric power steering system in LA-4 mode. These results could be used to choose a power steering system on the focus of interest.

Hardware-in-the-loop simulations of an electrohydraulic power steering system for developing the motor speed map of heavy commercial vehicles

Kim, Seong Han,Chu, Chong Nam Professional Engineering Publishing Ltd 2015 Proceedings of the Institution of Mechanical Engin Vol. No.

<P>This study proposes hardware-in-the-loop simulations to develop the motor speed map of electrohydraulic power steering systems for heavy commercial vehicles. The current method that relies on the test driver’s hands and feet to obtain electrohydraulic power steering motor speed maps causes a number of problems, such as inaccurate steering rates and vehicle speeds and the risk of rollover during tests. In order to overcome these weaknesses, this study employs a hardware-in-the-loop simulation system, a vehicle model, and an experimental development method. A hardware-in-the-loop simulation system was set up to simulate a steering system on the road. The system includes a system drive, data acquisition, system controller sets, and an electrohydraulic power steering system. This hardware-in-the-loop simulation system is controlled in real time because the amount of the torque from the resistant torque motor, which applies the self-aligning moments generated between the ground and the tires to the steering system, is affected by the steering angle of the steering-wheel motor. For calculation of the resistant torque with respect to various driving conditions, a vehicle model was employed in this study. It includes calculation of the self-aligning moments with the tire property data, the moments due to the kingpin inclination, the vehicle dynamics, and the steering-system modeling. The resultant values were input into the resistant torque motor. In addition to the hardware-in-the-loop simulation system and the vehicle model, the concept of a desirable steering torque which parameterizes the steering feel was introduced in this study. Using the desirable steering torque, the steering feel could be quantified, and desirable steering feels were established. In this study, in order to validate the hardware-in-the-loop simulations, a heavy commercial vehicle was designated as the target vehicle. The target vehicle’s tire and specifications such as the dimensions, the weight, the steering system, and the mechanical links were adopted, and a desirable steering-torque map was established by a professional test driver. The development results were presented.</P>

풍력발전단지가 전력계통에 미치는 영향을 터빈 특성을 고려하여 시뮬레이션하기 위한 방법 연구

지현호,김태형,임정택,함경선 한국풍력에너지학회 2021 풍력에너지저널 Vol.12 No.2

The use of renewable energy sources for power generation has been steadily increasing. In particular, power generated by wind energy accounts for the second highest share of power generation. However, owing to variability in power generation, which is a characteristic of renewable energy, the power quality of the latter is deteriorating. Additionally, serious issues such as blackouts are emerging. On the island of Jeju, in particular, it is important to ensure stable power generation owing to its relatively small-scale power system, which has a circular structure. To solve this problem, it is necessary to accurately evaluate the influence of wind farms on power systems. To this end, each wind farm simulator and power system simulator must be precisely interlocked. In this study, we propose a system that can accurately evaluate the stability of a power system serving Jeju. This system is configured by interlocking a model-based wind farm simulator, which simulates the Dongbok-Bukchon wind farms on Jeju, and an RTDS that simulates the entire Jeju power system. Voltage and frequency fluctuations are also evaluated using this system.

EFFECTS OF FTP-75 MODE VEHICLE FUEL ECONOMY IMPROVEMENT DUE TO TYPES OF POWER STEERING SYSTEM

위효성,이용규,박진일,이종화,박경석 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.6

This paper focuses on fuel economy improvement according to the type of power steering system. Usually, a conventional power steering system is directly driven by the crankshaft of the engine with a belt, known as HPS (hydraulic power steering). However, there is some inefficiency with this system at high engine speeds. To improve this inefficiency, automobile makers have developed two power steering systems: EHPS (electro-hydraulic power steering) and MDPS (motordriven power steering) or EPS (electric powered steering). However, there has been insufficient study of effects of the type of power steering system on fuel economy. In this paper, the effect of the type of power steering system on fuel economy is studied experimentally, and calculations of the effect on vehicle fuel economy are presenting using computer simulation with AVL cruise software. The results demonstrate that a 1% vehicle fuel economy improvement can be achieved in a vehicle with an electro-hydraulic power steering system compared to a vehicle with a hydraulic power steering system. In addition, a 1.7% vehicle fuel economy improvement can be achieved using a full electric power steering system in a FTP-75 driving cycle. These results could be used to choose a power steering system.

대형 상용차량 하이브리드 전동식 조향 시스템 주행 성능평가를 위한 HILS 시스템 개발

유춘식(Chunsik Yoo),최규재(Gyoojae Choi) 한국자동차공학회 2017 한국 자동차공학회논문집 Vol.25 No.1

Most commercial vehicles have adopted the hydraulic power steering system. To reduce fuel consumption and to improve steering controllability, a hybrid electric power steering system is being developed for commercial vehicles. In this study, the HILS (Hardware In the Loop Simulation) system equipped with a commercial vehicle hybrid electric power steering system was developed and the vehicle dynamic performance of a truck with the steering system was evaluated. The hybrid electric power steering system is composed of the EHPS motor pump, column mounted EPS system, and ball nut steering gear box for heavy commercial vehicles. The accuracy of vehicle models equipped with the HILS system was verified with comparisons between the simulation results and field test results. The road reaction forces of the steering system were generated from the vehicle model and verified using field test results. Step steering tests using the verified HILS system were carried out and the performance of a newly developed commercial vehicle hybrid electric power steering system was evaluated.

Development of Software Component Architecture for Motor-Driven Power Steering Control System using AUTOSAR Methodology

Jae-Woo Kim,Kyung-Jung Lee,Hyun-Sik Ahn 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

This paper describes the development of the software component (SW-C) architecture for a motor-driven power steering (MDPS) control system using the automotive open system architecture (AUTOSAR) methodology. The MDPS control system is a new power steering technology that replaces the hydraulic actuator system with the electric actuator system. As soon as the driver turns the steering wheel, the MDPS control system generates assistant torque to enhance the driver’s convenience and fuel efficiency. AUTOSAR is a common platform for the implementation of automotive embedded software. Some aspects of safety and timing requirements are analyzed. The AUTOSAR methodology improves flexibility, reusability, and maintenance of automotive embedded software. Therefore, we design the SW-C architecture for an MDPS control system using an AUTOSAR SW-C authoring tool. In addition, we implement and validate the MDPS control model based on the designed SW-C architecture using MATLAB/Simulink.

Test Platform Development of Vessel's Power Management System Using Hardware-in-the-Loop Simulation Technique

Lee, Sang-Jung,Kwak, Sang-Kyu,Kim, Sang-Hyun,Jeon, Hyung-Jun,Jung, Jee-Hoon The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.6

A PMS (Power Management System) controls vessel's power systems to improve the system efficiency and to protect a blackout condition. The PMS should be developed with considering the type and the capacity of the vessel's power system. It is necessary to test the PMS functions developed for vessel's safe operations under various sailing situations. Therefore, the function tests in cooperation with practical power systems are required in the PMS development. In this paper, a hardware-in-the-loop (HIL) simulator is developed for the purposes of the PMS function tests. The HIL simulator can be more cost-effective, more time-saved, easier to reproduce, and safer beyond the normal operating range than conventional off-line simulators, especially at early stages in development processes or during fault tests. Vessel's power system model is developed by using a MATLAB/SIMULINK software and by communicating between an OPAL-RT's OP5600 simulator. The PMS uses a Modbus communication protocol implemented using LabVIEW software. Representative tests of the PMS functions are performed to verify the validity of the proposed HIL-based test platform.