• Title/Summary/Keyword: load simulator

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Study for the Design of Hydraulic Load Simulator (유압식 부하 시뮬레이터의 설계에 관한 연구)

  • 이성래;김형의;문의준
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.1
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    • pp.44-52
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    • 1994
  • Load simulator is essential to test and quality the performance of various control systems. It is good time to introduce a method to design and analyze the load simulator or since many research centers and industrial companies are trying to buy or design the load simulator. The stability, accuracy and response speed of the simulator are represented by the system parameters such as the hydraulic motor characteristics, the servovalve characteristics, supply pressure, rotational inertia, rotational spring constant, sensor and controller gains. Two design examples are shown here. A load simulator for a position control system and that for a velocity control system are designed. The goodness of the proposed method is verified by the digital computer simulations.

Evaluation of Structural Safety of Electro-Mechanical Linear Actuator and Load Simulator with Plate Spring

  • Kim, Dong-Hyeop;Kim, Young-Cheol;Kim, Sang-Woo;Lee, Jong Whan
    • Journal of Aerospace System Engineering
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    • v.14 no.6
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    • pp.18-25
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    • 2020
  • This study investigated the structural behaviors and safety of an electro-mechanical linear actuator and a load simulator with a plate spring. The material and dimensions of the plate spring were determined by theoretically calculating the stress and torsional angle for the rating load of the actuator. Thereafter, a flexible multibody dynamics (FMBD) analysis was conducted on the linear actuator and load simulator to confirm the performance of the load simulator and acquire the reaction forces acting on the actuator and simulator. The structural safety of the linear actuator and load simulator was evaluated via finite element analysis using the aforementioned reaction forces. Consequently, the proposed linear actuator and load simulator were determined to be structurally safe; however, the safety factors for the actuation rod and the housing on the actuator were excessively high. Therefore, the weight and cost must be reduced to improve their design parameters in the future.

Load Simulator with Power-Recovery Capability Based on Voltage Source Converter-Inverter Set (전력회수 능력을 갖는 전압원 컨버터-인버터 세트로 구성된 부하모의장치)

  • Bae B.Y.;Han B.M.
    • Proceedings of the KIPE Conference
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    • 2004.11a
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    • pp.76-80
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    • 2004
  • This paper describes a load simulator with power-recovery capability, which is based on the voltage source converter-inverter set. The load simulator described in this paper can save the electric energy that should be consumed to test the operation and performance of the distributed generation system and the power quality compensator. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. The load simulator can be widely used in the lab to test the performance of the distributed generation system and the power quality compensator.

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Load Simulator with Power-Recovery Capability Based on Voltage Source Converter-Inverter Set (전력회수 능력을 갖는 전압원 컨버터-인버터 세트로 구성 된 부하모의 장치)

  • Bae Byung-Yeol;Han Byung-Moon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.4
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    • pp.181-187
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    • 2005
  • This paper describes a load simulator with power-recovery capability, which is based on the voltage source converter-inverter set. The load simulator described in this paper can save the electric energy that should be consumed to test the operation and performance of the distributed generation system and the power quality compensator. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. The load simulator can be widely used in the lab to test the performance of the distributed generation system and the power quality compensator.

Development of Educational Simulator for Load Flow (교육용 전력조류계산 시뮬레이터 개발)

  • Kim, Hyun-Houng;Jeong, Yun-Won;Yang, Kwang-Min;Lee, Ki-Song;Park, Jong-Bae;Shin, Joong-Rin
    • Proceedings of the KIEE Conference
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    • 2004.11b
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    • pp.88-90
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    • 2004
  • This paper presents the development method of educational simulator for the load flow. The developed simulator can be made the students to model, analysis of power systems by drawing the system and performing the load flow by themselves under window environment. For the effective education of load flow, we have introduced the avatar which is the object to explain the load flow to the students. Also, The simulator has developed by using the language based on XML(Extended Markabel Language). Therefore, we determine that this simulator is useful to educate the load flow and easily to expand the other application program.

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Performance Analysis of load simulator interconnected with Power Quality Compensator (전력품질 보상기와 부하모의장치의 연계시험 분석)

  • Bae, Byung-Yeol;Cho, Yun-Ho;Park, Yong-Hee;Han, Byung-Moon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.1
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    • pp.89-97
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    • 2007
  • This paper describes a load simulator with power recovery capability, which is based on the voltage source converter-inverter set. The load simulator can save the electric energy that should be consumed to test the operation and performance of the power quality compensator and the power equipment. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. the performance of proposed load simulator was analyzed with scaled-model experiment, interconnected with the active power filter. The experimental results confirms that the proposed load simulator can be utilized to test the performance of active power filter.

The Study of the Design of a Hydraulic Torque Load Simulator Equipped with a Direct Drive Servo Valve and a Feed forward Compensator (직접 구동형 서보밸브와 전진 보상기를 적용한 유압식 토크 부하 시뮬레이터의 설계에 관한 연구)

  • Lee, Seong Rae
    • Journal of Drive and Control
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    • v.15 no.1
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    • pp.16-27
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    • 2018
  • Hydraulic torque load simulator is essential to test and qualify the performance of various angle control systems. Typically a flapper-type second stage servovalve is applied to the load simulator, but here the direct drive servovalve, which is a kind of one-stage valve and affected by the large flow force, is applied. Since the torque load is applied not to the stationary shaft but to the rotating shaft of the angle control system, the controlled torque of load simulator is not accurate due to the rotating speed of the angle control system. A feedforward compensator is designed and applied to minimize the disturbance-like effect. A mathematical model is derived and linearized to analyze the stability, accuracy and responsiveness of the torque load simulator. The parameter effects of a controller, servovalve, hydraulic motor, rotating spring shaft are analyzed and summarized. The goodness of the linear analysis is verified by the digital computer simulations using both the linear and nonlinear mathematical models.

Load Test Simulator Development for Steam Turbine-Generator System of Nuclear Power Plant

  • Jeong, Chang-Ki;Kim, Jong-An;Kim, Byung-Chul;Choi, In-Kyu;Woo, Joo-Hee
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.1384-1386
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    • 2005
  • This paper focuses on development of load test simulator of a steam turbine-generator in a nuclear power plant. When load is taken off from electrical power network, it is very difficult to effectively control the steam flow to turbine of the nuclear turbine-generator, because of disturbances, such as electrical load and network unbalance on electrical network. Up to the present time, the conventional control system has been used for the load control on nuclear steam generator, owing to the easy control algorithms and the advantage which have been proven on the nuclear power plant. However, since there are problems with stability control during low power and start-up, only a highly experienced operator can operate during those procedures. Also, a great deal of time and an expensive simulator is needed for the training of an operator. The KEPRI is developed simulator for 600MW nuclear power plant to take a test of generator load rejection, throttle valve, and turbine load control. Total load test is implemented before start up.

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Structural and Dynamic Analysis of Three-Axis Road Simulator (3축 로드 시뮬레이터의 구조 및 동적 해석)

  • 황성호;김화진;박창수;최경락
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.105-111
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    • 2003
  • The three-axis road simulator is the test equipment which can simulate the standardized road conditions for the durability evaluation of automotive components such as suspensions. The road load data are collected and acquired from a vehicle test, and then these data are used to simulate road load conditions by the road simulator which consists of hydraulic actuators, link mechanism and servo controller. The link mechanism must be designed in consideration of the dynamic effect and interference during three axes motions in order to generate accurate motions. In this paper, the structural and kinematic analysis of the link mechanism is performed, and these results can be used for developing the three-axis road simulator. The three-axis road simulator provides considerable savings in cost, development time, and testing risk during developing automotive components.

A Study on the Load Flow Program for 765[㎸] Substation Simulator (765[㎸] 변전소 시뮬레이터를 위한 조류계산 프로그램에 관한 연구)

  • 여상민;김철환;이종포
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.4
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    • pp.201-206
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    • 2003
  • Power system is analyzed by three methods of load flow, fault calculation, and voltage stability. Among there, load flow is calculated to flow of power in power in system at steady state. But, load flow is difficult to analyze to flow of power in substation, because power flow frequently alter by various equipments such as circuit bleaker, disconnect switch and shunt reactor. Particular, in 765[㎸] system, because of form of 1.5GB for stable operation, structure of substation has been very complex. In this paper, we describe technique for application of load flow algorithm in simulator for 765[㎸] substation. For this technique, we built each database for various equipments and considered form of 1.5GB Data as form of bus and line, for application of load flow, are acquired from built database, and then calculate load flow in substation. And. results of load flow are outputted in screen of operator console program.