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  • 제목/요약/키워드: integrated order

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Hybrid vibro-acoustic model reduction for model updating in nuclear power plant pipeline with undetermined boundary conditions

  • Hyeonah Shin;Seungin Oh;Yongbeom Cho;Jinyoung Kil;Byunyoung Chung;Jinwon Shin;Jin-Gyun Kim
    • Nuclear Engineering and Technology
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    • 제56권9호
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    • pp.3491-3500
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    • 2024
  • In this work, the hybrid vibro-acoustic model reduction technique that is a physical-modal combined formulation is proposed to accelerate the finite element model updating process of the vibro-acoustic pipeline system. Particularly, the new formulation could provide an effective way of the model updating by preserving the physical DOFs for the direct calibration of the undetermined boundary conditions. The sensitivity based vibro-acoustic model updating is first conducted, and then the undetermined spring constant at the displacement boundary condition is then directly and effectively calibrated by using the proposed hybrid model reduction formulation. The proposed method is implemented in the real nuclear facility to evaluate its performance. In addition, an experimental implementation test using the inverse force identification process is also conducted to demonstrate the reliability of the generated vibro-acoustic FE model through the proposed method.

Reduced Error Model for Integrated Navigation of Unmanned Autonomous Underwater Vehicle (무인자율수중운동체의 보정항법을 위한 축소된 오차 모델)

  • Park, Yong-Gonjong;Kang, Chulwoo;Lee, Dal Ho;Park, Chan Gook
    • Journal of Institute of Control, Robotics and Systems
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    • 제20권5호
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    • pp.584-591
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    • 2014
  • This paper presents a novel aided navigation method for AUV (Autonomous Underwater Vehicles). The navigation system for AUV includes several sensors such as IMU (Inertial Measurement Unit), DVL (Doppler Velocity Log) and depth sensor. In general, the 13th order INS error model, which includes depth error, velocity error, attitude error, and the accelerometer and gyroscope biases as state variables is used with measurements from DVL and depth sensors. However, the model may degrade the estimation performance of the heading state. Therefore, the 11th INS error model is proposed. Its validity is verified by using a degree of observability and analyzing steady state error. The performance of the proposed model is shown by the computer simulation. The results show that the performance of the reduced 11th order error model is better than that of the conventional 13th order error model.

A Three-layered Optical Waveguide of Second-order Orbital Angular Momentum Mode Guiding for Photonic Integrated Circuit (3층 구조를 가지는 광 집적회로용 2차 궤도 각운동량 광 도파로)

  • Lee, In-Joon;Kim, Sang-In
    • The Journal of the Korea institute of electronic communication sciences
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    • 제14권4호
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    • pp.645-650
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    • 2019
  • In this paper, a specifically designed waveguide structure that can carry first, and second-order orbital angular momentum(: OAM) mode is proposed. The proposed optical waveguide consists of three Si stripes embedded in SiO2, which is suitable for implementing on-chip integration and fabrication by standard thin film deposition and etching processes. The second-order OAM mode was generated by combining two eigenmodes, which are calculated by finite difference method(: FDM). The topological charge number of the first, and second-order OAM mode was calculated as l=0.9642 and 1.8766 respectively, which is close to the theoretical value.

A Study on the Standard Method of Measurement Information Communication Field Contractors (정보통신시설공사 수량산출기준에 관한 연구)

  • Seol, Dong-Hwa;Lee, Kwang-Hee
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • 제2권4호
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    • pp.52-63
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    • 2003
  • This study proposes a change from the currentexpected price integrated system, which is based on the standard of estimated unit manpower and material, to a new actual construction cost integrated system. In order to implement it, the standard method of measurement organization system as well as the communication area standard of estimated unit manpower and material should be changed Moreover, the work breakdown structure and itemized structure should be assorted.

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A Novel Integrated Generator Converter System for HVDC and Eddy Current of it's Solid Rotor Core (HVDC 송전을 위한 새로운 집적변환 발전기 계통과 그 회전자 중심의 와전류)

  • 이은웅;김일중;이민명
    • The Transactions of the Korean Institute of Electrical Engineers
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    • 제37권7호
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    • pp.434-441
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    • 1988
  • This paper proposes a new invention of the integrated generator converter system for the HVDC transmission. And it analyses the general formula for eddy currents in the rotor iron using the double Fourier series in order to trace the smallest eddy current losses of the system which connects a new designed synchronous generator windings or conventional synchronous generator windings with the v Graetz bridges.

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An Integrated Model of SPC and EPC with Second-order Autoregressed Disturbance (이계자동회귀 각란모형을 고려한 EPC와 SPC의 통합시스템)

  • 김종걸;정해운
    • Proceedings of the Korean Reliability Society Conference
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    • 한국신뢰성학회 2001년도 정기학술대회
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    • pp.321-334
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    • 2001
  • EPC seeks to minimize variability by transferring the output variable to a related process input(controllable) variable, while SPC seeks to reduce variability by detecting and eliminating assignable causes of variation. In the case of product control, a very reasonable objective is to try to minimize the variance of the output deviations from the target or set point. We compare three control systems; EPC, combined system with EWMA and EPC, and SPC. This paper shows through simulation that the performance of the integrated model of EPC and SPC is more preferable than that of EPC.

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A Novel Charger/Discharger for the Parallel Connected Battery Module System (병렬 연결 배터리 모듈 시스템을 위한 새로운 충.방전기)

  • 조윤제
    • Proceedings of the KIPE Conference
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    • 전력전자학회 2000년도 전력전자학술대회 논문집
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    • pp.636-640
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    • 2000
  • A novel integrated battery charger/discharger converter for a standardized battery module is proposed. Instead of using separate charger and discharger converters. it integrates these two converters into a single converter in order to minimize the size. the integrated charger/discharger converter not only regulates the solar array output power including the peak power tracking capability but also controls the battery charging/discharging current depending on the solar array output power and the load power. In addition it offers a regulated bus voltage which simplifies the power distribution/conversion for the pay load.

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A Study on Building Society Research Information System (학회 학술정보시스템 구축에 관한 연구)

  • 조현양;최선희
    • Journal of Korean Library and Information Science Society
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    • 제30권3호
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    • pp.405-426
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    • 1999
  • Academic societies in the field of science and technology are major producers of domestic research information. These information are very important sources to researchers, students and so on. KORDIC built an integrated information system which facilitates the progress of building databases and promotes users easy access to databases. In order to build efficient society research information system, we investigated former cases and analyzed requirement of each society. We identified principal information sources and built an integrated information service system using internet homepage and information retrieval system(KRISTAL-II). In the future we will expand participating societies and focus on text-based information.

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A QoS Support Architecture in Mobile IPv6 using HMAT (HMAT을 사용한 Mobile IPv6의 QoS 보장 구조)

  • 곡소위;홍충선
    • Proceedings of the Korean Information Science Society Conference
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    • 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (3)
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    • pp.358-360
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    • 2001
  • In Integrated Services Internet the Resource Reservation Protocol (RSVP) provides a signaling mechanism for end to end QoS. In this paper, we propose a novel scheme using a Hierarchical Mobile Agents Tree (HMAT) based on the definition of new option called QoS Object Option (QOO) in order to improve the efficiency during handoff in Integrated Services Internet. Mobile agents are required to manage QOO, resource reservation and other mobility related basks un behalf of mobile hosts. This scheme is based on Mobile IPv6.

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