• Title, Summary, Keyword: Air Vehicle Test Equipment

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Design and Implementation of Air Vehicle Test Equipment for Unmanned Aerial Vehicle (무인항공기 점검을 위한 비행체점검장비 설계 및 구현)

  • Kwon, Sang-eun
    • Journal of Advanced Navigation Technology
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    • v.24 no.4
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    • pp.251-260
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    • 2020
  • Unlike manned aerial vehicles, because an unmanned aerial vehicle (UAV) has a limitation which allows only remote test during flights, it is very important to maintain the high reliability of the vehicle through pre- and post-flight tests. To this end, this paper designed an air vehicle test equipment (AVTE) for UAV which meets the derived hardware and software requirements. Based on this design, the AVTE was implemented in accordance with the actual test scenario. The implemented AVTE has the advantage of reducing the time and cost required for the test of UAV by allowing the operator to perform automatic or manual tests for necessary parts in various situations such as before and after starting engine and pre- and post-flight tests. Furthermore, this study is expected to help with the design and implementation of AVTE for other UAVs.

A Study on the Improvement of Air Vehicle Test Equipment(AVTE) stop by UAV Engine noise (UAV 엔진 소음에 의한 비행체점검장비(AVTE) 정지 현상 개선방안 연구)

  • Kang, Ju Hwan;Lim, Da Hoon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.1
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    • pp.90-96
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    • 2020
  • In this era, intelligence is considered a major factor in the defense sector. As a result, securing technology for weapons systems for monitoring and reconnaissance of companies has become inevitable. As a result, UAVs (Unmanned Aerial Vehicles) have been developed and are actively operating around the world if the flight operation of manned aircraft is restricted, such as in environments that are too dangerous, messy or boring for the military to perform directly. The system of unmanned aerial vehicles, which has been researched and developed in Korea, includes Air Vehicle Test Equipment(AVTE). AVTE is equipment that is connected to an UAV to check its status and allows the operator to check its flightability by issuing an operational command to the UAV and verifying that it follows the command values. This study conducts fault finding on the phenomenon where the AVTE has stopped operating due to engine noise during these operations and analyzes the cause in terms of software, hardware and external environment. Present improvement measures according to the cause are analyzed and the results of verifying that the proposed measures can prevent failure are addressed.

A Study on the Longitudinal and Lateral Errors of Air Vehicle Heading for Auto-landing

  • Park, Ji Hee;Park, Hong Sick;Shin, Chul Su;Jo, Young-Wo;Shin, Dong-Ho
    • Journal of Positioning, Navigation, and Timing
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    • v.2 no.2
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    • pp.115-121
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    • 2013
  • For the auto-landing operation of an air vehicle, the possibility of auto-landing operation should be first evaluated by testing the navigation performance through a flight test. In general, navigation performance is tested by analyzing north/east/down (NED) errors relative to reference equipment whose precision is about 8~10 times higher than that of a navigation system. However, to evaluate the auto-landing operation of an air vehicle, whether the air vehicle approaches a glide path aligned with the runway, within a specific error, needs to be examined rather than examining the north/east errors of the navigation system. Therefore, the longitudinal/lateral errors of air vehicle heading need to be analyzed. In this study, a method for analyzing the longitudinal/lateral errors of a navigation system was proposed as the navigation performance test method for evaluating the safety during the auto-landing of an air vehicle. Also, flight tests were performed six times, and the safety of auto-landing was examined by analyzing the performance using the proposed method.

Identifying Key Factors to Affect Vehicle Inspection and Maintenance(I/M) Test Results Using a Binary Logit Model (California Case Study) (이항로짓모형을 이용한 자동차 배출가스 검사결과에 미치는 요인분석(미국 캘리포니아 사례를 중심으로))

  • Chu, Sang-Ho
    • Journal of Korean Society of Transportation
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    • v.24 no.3
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    • pp.189-195
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    • 2006
  • For the past decades, vehicle emissions has been a major source of air pollution in urban areas Vehicle inspection and maintenance (I/M) test programs were developed for major metropolitan areas to reduce urban air pollution. However. there are a few studies of exploring major factors to influence I/M test failure. This study develops a logit model to identify key factors affecting overall test failure, using the vehicle I/M test data from California in October 2002. The model results indicate that vehicle age, odometer reading, engine size, vehicle make, presences of emissions control equipment, and test types have significant effects on the probability of I/M test failure.

An Experimental Study on GHG Emissions Reduction and Fuel Economy Improvement of Heavy-Duty Trucks by Using Aerodynamics Device Package (공기저항 저감장치 패키지를 이용한 대형화물차량의 연비개선 및 온실가스 저감효과에 관한 실험적 연구)

  • Park, Seungwon;Dong, Lang;Her, Chulhaeng;Yun, Byoeunggyu;Kim, Daewook
    • Transactions of the Korean Society of Automotive Engineers
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    • v.25 no.2
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    • pp.207-218
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    • 2017
  • Improving fuel consumption, particularly that of commercial vehicles, has become a global concern. The reduction in logistics cost has been a key issue in efforts to improve fuel economy and efficiency of transportation equipment. Typical technologies for reducing reduce fuel usage include air resistance reduction technologies, tire rolling resistance technologies, and idle technologies among others. Air resistance technology is a highly effective method that can be easily applied in a short period. As with air resistance technology, several devices involving side skirt, boat tail and gap fairing have been developed based on an analytical 3-D modeling technique for reducing air resistance attributed to the vehicle configuration. The devices were on a 45 feet tractor-trailer and the emission test was done using PEMS equipment. Fuel economy was evaluated by introducing several devices to reduce outer air resistance. The test was conducted by changing the experimental method of SAE J1321 Joint TMC/SAE Fuel Consumption Test Procedure - Type II test. As a result, air resistance decreased by at least 15 % and fuel economy improved by at least 13 %. This study sought to reduce greenhouse gas and improve fuel economy by applying several devices to a test vehicle to lower air resistance.

A Study of Development and Application for Side Impact Sled Test (모의 측면 충돌 시험 기법 개발 및 응용)

  • 최현진
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.1
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    • pp.138-144
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    • 2004
  • Occupant protection in the side impact of a vehicle becomes one of the most important issues today. So, to reduce development time and cost, it needs test equipment which conducts an accurate simulation of the side impact crash. This paper describes a new test method for side impact, which utilizes a standard 12inch-HYGE-type sled facility. If a side impact sled test can simulate vehicle intrusion very well, it will contribute to develop full-scale side impact crash performance. The newly developed sled test method enables simulation for dummy motion, injury, door velocity, trim crack, and vehicle structure to be accurate. Ant also this sled test method can be applied to the development of side air-bag.

Analysis and Alternative Circuit Design of Pneumatic Circuit for An Automotive Air Suspension (자동차 공기현가 공압회로 해석 및 대체회로 설계)

  • Lee, J.C.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.5 no.4
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    • pp.17-25
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    • 2008
  • This study presents an analytical model of the pneumatic circuit of an air suspension system to analyze the characteristics of vehicle height control. The analytical model was developed through the co-simulation of Simulink(air spring) and HyPneu(pneumatic circuit). Variant effective area of air spring and flow coefficients of pneumatic valves were estimated experimentally prior to the system test, and utilized in simulation. One-comer test apparatus was established using the components of commercial air suspension products. The results of simulation and experiment were so close that the proposed analytical model in this study was validated. However the frictional loss of conduit and heat dissipation which were ignored in this study need to be considered in future study. As an application example of proposed analytical model, an alternative pneumatic circuit of air suspension to conventional WABCO circuit was evaluated. The comparison of simulation results of WABCO circuit and alternative circuit show that proposed analytical model of co-simulation in this study is useful for the study of pneumatic system of automotive air suspension.

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A Research on the Static Discharger Installation Design and Test for Air Vehicle (항공기 외표면 정전기 방출기 장착설계 및 시험에 관한 연구)

  • Woo, Hee-Chae;Kim, Yong-Tae;Kim, Bong-Gyu
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.7
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    • pp.574-580
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    • 2017
  • Static dischargers should be installed on air vehicle to emit a static electricity during flight. Especially, If static electricity is not removed by static discharger on the air vehicle, it makes ionization and corona effect on the edge of antenna and wing. Those phenomenon bring about performance degradation for radio communication and equipment operation. In this paper, the conditions such as climate, air vehicle's speed and frontal area were analyzed to design static dischargers. As a result, the static dischargers would be optimally designed for air vehicles and the performance of the static dischargers can verify according to the functional experiment. Therefore the result of this research will be used to make static discharger installation design for new air vehicle that have different size and mission.

A Study on Design and Verification of Power Monitoring Unit for Unmanned Aerial Vehicle (무인항공기용 전원모니터링장치 설계 및 검증에 관한 연구)

  • Woo, Hee-Chae;Kim, Young-Tae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.4
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    • pp.303-310
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    • 2020
  • This paper describes a Power Monitoring Unit (PMU) for Unmanned Aerial Vehicle (UAV) electrical system, It is designed for the PMU which performs data sensing of generator, transformer rectifier unit (TRU), battery and gear box installed in UAV and operate power ON/OFF devices of mission equipment. The PMU measures the voltage and current for the aircraft power source (generators, transformer rectifier unit and battery), measures the pressure and temperature of the gearbox, and performs the mission equipment power command received from the mission computer. The PMU was designed to meet the requirements of the UAV, and was performed through structure/thermal analysis, environmental test, EMI test and ground/flight tests.

Numerical Analysis Approach to Calculate the Damage Degree of the Combat Vehicle (전투차량의 피해 정도를 계산하기 위한 수치해석적 접근법)

  • Cho, A Hyoun;Park, Kang;Kim, Gun In
    • Korean Journal of Computational Design and Engineering
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    • v.22 no.2
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    • pp.101-109
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    • 2017
  • In order to reduce the number of casualties by improving the survivability of the combat vehicle, the vulnerability analysis of the combat vehicle is needed. However, the actual test for the vulnerability analysis requires large experimental space and expensive equipment costs long time and large expense. It is needed to develop a new method that can replace the actual test. In the paper, we suggested a new approach to analyzing the vulnerability using the M&S method instead of the actual test. To analyze the vulnerability, the shot line analysis is performed to find out which part is penetrated by the bullet. The component of the parts is simplified to "Single-Target", "Double-Target", "Air gapped-Target" and can be performed the penetration analysis using the ANSYS Explicit Dynamics. The penetration depth and the residual velocity of the bullet are calculated by analyzing penetration of each part of the combat vehicle. The penetration data calculated the penetration analysis can be used to define the damage level of the combat vehicle. The purpose of this paper is to collect penetration data for various targets and bullets. And "7.62mmAP" is used as the bullet, "7075-T6" is used as a target.