• Title/Summary/Keyword: R%26D Process

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Preminary analysis of performance of avionics equipment using worst case analysis (Worst Case 분석을 이용한 항공 전자장비 성능 사전분석)

  • Cheon, Young-ho;Woo, Hui-Seung;Seo, Inn-beom;Ahn, Tae-Sik
    • Journal of Advanced Navigation Technology
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    • v.26 no.4
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    • pp.185-194
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    • 2022
  • Avionics equipment requires various environmental conditions and performance during development, and as a countermeasure against such development risk, the worst-case circuit analysis(WCCA) is applied to predict perform preliminary performance analysis. WCCA calculates the maximum and minimum values by combining the parameter values of the relevant circuit after deriving the parameter values in consideration of the aging of the temperature and operating period at the component level. In this paper, the necessary matters for WCCA application are described. Chapter 2 describes the differences and characteristics of the WCCA techniques EVA, RSS, and Monte Carlo.Chapter 3 introduces the analysis process through the example circuit to introduce the actual analysis procedure. Chapter 4 describes the method of selecting an analysis technique for each condition of the analysis target. As a result of applying the procedures and analysis methods introduced in this paper when open, it was confirmed that preliminary performance analysis and part optimization design verification are possible.

A Study on a Information Fusion Architecture of Avionics Realtime Track and Tactical Data Link (항공기 센서 실시간 항적 정보와 항공전자 전술데이터링크 정보융합 구조 연구)

  • Kang, Shin-Woo;Lee, Young Seo;Park, Sang-Woong;Ahn, Tae-Sik
    • Journal of Advanced Navigation Technology
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    • v.26 no.5
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    • pp.325-330
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    • 2022
  • The sensors of aircraft are necessity for mission performance and fusion process of data from them is applied for increase of mission efficiency and decrease of aircraft pilot workload. Data fusion is applied and developed to provide pilot a series of more processed data format about a specific target from sensors in aircraft. Military aircraft currently in operation are linked with a tactical data link such as Link-16 to display improved tactical situation to pilots to increase mission efficiency. By fusing the sensor data with improved accuracy obtained as the sensors' performance mounted on the aircraft become higher and the tactical situation information received through the tactical data link, it provides the pilot with a highly reliable tactical situation and mission environment, and expects efficient mission performance and high survivability. In this paper, a fusion architecture to produce fused data with realtime information from the sensors and data through a tactical data link is shown.

Design and Analysis of UHF-GPS Antenna for Autonomous Underwater Vehicles (자율무인잠수정용 UHF-GPS 안테나 설계 및 해석)

  • Sang-Jin Park;Yeong-Jun Jo;Dong-Hyun Seo;Lin-Keun Park
    • Journal of Advanced Navigation Technology
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    • v.26 no.6
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    • pp.464-473
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    • 2022
  • In this paper, about a lightweight design that satisfies the performance of UHF-GPS Antenna used in autonomous underwater vehicle is proposed. Structural analysis, watertight external pressure test and non-destructive testing used in the design process are decided in consideration of structural safety for operating external forces in the underwater environment. First, the material of radome is selected for the performance of the UHF-GPS Antenna for communication with the carrier on the underwater operation in consideration of the 20 bar pressure generated. And the material of radome as PA-GF is selected by conducting electromagnetic field analysis and structural analysis and by considering high strength, rigidity and high dielectric constant. Electromagnetic field analysis and structural analysis by the thickness of radome are additionally performed in order to satisfy the required weight of UHF-GPS antenna. After selecting the final model, its structural safety is verified through watertight external pressure test and non-destructive testing.

Synthesize of Nd2Fe14B Powders from 1-D Nd2Fe14B Wires using Electrospinning Process (전기방사 공정을 이용하여 1차원 Nd2Fe14B섬유로부터의 Nd2Fe14B 자석분말 합성)

  • Eom, Nu Si A;Noh, Su;Haq, Muhammad Aneeq;Kim, Bum Sung
    • Journal of Powder Materials
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    • v.26 no.6
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    • pp.477-480
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    • 2019
  • Magnetic 0-D Nd2Fe14B powders are successfully fabricated using 1-D Nd2Fe14B nanowire formed by an efficient and facile electrospinning process approach. The synthesized Nd-Fe-B fibers and powders are investigated for their microstructural, crystallographic, and magnetic properties according to a series of subsequent heat treatments. Each heat-treatment process leads to the removal of organic impurities and the formation of the respective oxides/composites of Nd, Fe, and B, resulting in the formation of Nd2Fe14B powders. Nd-Fe-B fibers exhibit the following magnetic properties: The coercivity (Hci) of 3260 Oe, a maximum magnetization at 3T of 109.44 emu/g, and a magnetization remanence (Mr) of 44.11 emu/g. This process easily mass produces hard magnetic Nd2Fe14B powders using a 1-D synthesis process and can be extended to the experimental design of other magnetic materials.

A Case Study on the Risk Analysis for the Installation of Measurement Error Verification Facility in Hydrogen Refueling Station (수소 충전소 계량오차 검증 설비 설치를 위한 위험성 분석 사례 연구)

  • Hwayoung, Lee;Hyeonwoo, Jang;Minkyung, Lee;Jeonghwan, Kim;Jaehun, Lee
    • Journal of the Korean Institute of Gas
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    • v.26 no.6
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    • pp.30-36
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    • 2022
  • In commercial transactions of energy sources using hydrogen charging stations, high-accuracy flow meters are needed to prevent accidents such as overcharging due to inaccurate measurements and to ensure transparency in hydrogen commercial transactions through accurate measurements. This research developed a Corioli-type flowmeter prototype and conducted a risk assessment to prevent accidents during a process change comparison experiment for existing charging stations to verify the measurement performance. A process change section was defined for the installation of measurement facilities for empirical experiments and HAZOP was conducted. In addition, JSA was also conducted to secure the safety of experimenters, such as preventing valve mis-opening during empirical experiments. Measures were established to improve the risk factors derived through HAZOP, and work procedures were established to minimize human errors and ensure the safety of workers through JSA. The design change and system manufacturing for the installation of the metering system were completed by reflecting the risk assessment results, and safety could be confirmed through the performance comparison test of the developed meter prototype. The developed prototype flow meter showed a total of 30 flow measurements under the operating conditions of 70 MPa, and the average error was -1.58% to 3.96%. Such a metering error was analyzed to have the same performance as a flow meter installed and operated for commercial use.

Process Development for Production of Functional material from Citrus Madurensis(Citrofortunella microcarpa) Using Innovative Extraction by Focused Ultrasound(INEFU). (깔라몬딘오렌지로부터 집속초음파추출을 이용한 기능성 물질 생산 공정 최적화)

  • Seo, Seung beom;Kim, Yu Mi
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2018.10a
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    • pp.94-94
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    • 2018
  • 집속초음파 추줄법(Innovative Extraction by Focused Ultrasound, INEFU)은 기존의 추출법에 비교하여 식물세포벽으로부터 기능성 성분을 낮은 온도에서 높은 추출 효율을 얻기 위한 추출공정으로 적용하기 위하여 연구되고 있다. 본 연구에서는 깔라몬딘오렌지(깔라만시, Citrus Madurensis, Citrofortunella microcarpa)에서 Vitamin C와 Polyphenol의 기능성 성분 추출을 위해 INEFU를 적용하여 추출 효율에 미치는 요인을 평가하였다. 추출 변수의 최적화를 위해 추출 온도 및 추출 시간을 요인으로 하여 순차적인 최적화를 진행하였다. 동일한 추출조건에서 저온추출(CEM)과 INEFU를 비교하였을 때 INEFU에서 Vitamin C는 고순도로 26배 증가하여 추출되는 것을 확인하였다. 또한 Polyphenol는 저온추출(CEM)에서는 polyphenol이 극소량 추출되었으나, INEFU에서는 Feruric acid가 10.3배 증가하여 추출되는 것으로 확인하였다. 본 연구를 통해 INEFU가 기존의 추출 공정에 비해 기능성 성분 생산에 보다 효과적임을 확인하였다.

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A Study on Processes and Performance Evaluation for IR Camouflage Printed Selectively Permeable Membrane Fabrics (위장 날염된 선택 투과성 화생방 직물의 제조 공정연구 및 성능평가)

  • Jeong, Yong-Kyun;Moon, Sang-Hyun;Kang, Jae Sung;Seo, Hyeon Kwan;Park, Hyen Bae
    • Textile Coloration and Finishing
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    • v.26 no.1
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    • pp.13-21
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    • 2014
  • The object of this research is to perform the basic research for the development of selectively permeable membrane fabrics which is suitable for korean military in sense of embattlement. As a key factor of selectively permeable membrane fabrics which is suitable for korean military, this study selected the best PVA thickness and membrane selection for DMMP protection, pre-treatment method for conformational stability of face fabric and water/oil repellent process condition. Especially as the PVA coating thickness of the fabrics increase, peneration of DMMP decrease including water vapor permeation is lower. This study shows how physical features and permeability of chemical agents can be influenced by pre-treatment methods, the selection of selectively permeable membrane, the thickness of PVA etc. Results showed that outer shell / PVA / e-PTFE materials possessed performance with superior water vapor permeation (Over $3,000g/m^2/day$) and protective capability against DMMP vapor ($0.6{\mu}g/cm^2{\cdot}16hr$).

Model-based Analysis of Cell-to-Cell Imbalance Characteristic Parameters in the Battery Pack for Fault Diagnosis and Over-discharge Prognosis (배터리 팩 내부 과방전 사전 진단을 위한 모델기반 셀 간 불균형 특성 파라미터 분석 연구)

  • Park, Jinhyeong;Kim, Jaewon;Lee, Miyoung;Kim, Byoung-Choul;Jung, Sung-Chul;Kim, Jonghoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.6
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    • pp.381-389
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    • 2021
  • Most diagnosis approaches rely on historical failure data that might not be feasible in real operating conditions because the battery voltage and internal parameters are nonlinear according to various operating conditions, such as cell-to-cell configuration and initial condition. To overcome this issue, the estimator and the predictor require integrated approaches that consider comprehensive data, with the degradation process and measured data taken into account. In this paper, vector autoregressive models (VAR) with various parameters that affect overdischarge to the cell in the battery pack were constructed, and the cell-to-cell parameters were identified using an adaptive model to analyze the influence of failure prognosis. The theoretical analysis is validated using experimental results in terms of the feasibility and advantages of fault prognosis.

A study on the application of agile method to resolve electric system issues in the performance improvement of aged aircraft in the phase of mass production (양산 단계 노후 항공기 성능 개량에서 전기계통 이슈 해결을 위한 애자일 기법 적용연구)

  • In-Bok, Yoon;Kyeong-Soo, An
    • Journal of IKEEE
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    • v.26 no.4
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    • pp.560-567
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    • 2022
  • This paper proposed an application of agile management method to resolve the electrical system issues identified during the mass production phase of aged aircraft performance improvement. The proposed method was applied from issue analysis to on-site verification and testing stage, before the formal configuration control process. At this time, the project was carried out by setting a sprint period to complete the verification according to requirements through daily scrum and sprint review. As a result, It was verified that the wiring installation of the aircraft, which was the output of the sprint, met requirements within the defined sprint period.

A X-band 40W AlGaN/GaN Power Amplifier MMIC for Radar Applications (레이더 응용을 위한 X-대역 40W AlGaN/GaN 전력 증폭기 MMIC)

  • Byeong-Ok, Lim;Joo-Seoc, Go;Keun-Kwan, Ryu;Sung-Chan, Kim
    • Journal of IKEEE
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    • v.26 no.4
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    • pp.722-727
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    • 2022
  • In this paper, we present the design and characterization of a power amplifier (PA) monolithic microwave integrated circuit (MMIC) in the X-band. The device is designed using a 0.25 ㎛ gate length AlGaN/GaN high electron mobility transistor (HEMT) on SiC process. The developed X-band AlGaN/GaN power amplifier MMIC achieves small signal gain of over 21.6 dB and output power more than 46.11 dBm (40.83 W) in the entire band of 9 GHz to 10 GHz. Its power added efficiency (PAE) is 43.09% ~ 44.47% and the chip dimensions are 3.6 mm × 4.3 mm. The generated output power density is 2.69 W/mm2. It seems that the developed AlGaN/GaN power amplifier MMIC could be applicable to various X-band radar systems operating X-band.