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허석행(Seok-Haeng Huh),이석규(Sock-Kyu Lee),이병호(Byung-Ho Lee),이증(Jeung Lee),최관호(Kwan-Ho Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The actuator for the control surface of air vehicle wing controls aircrafts position and plays the important role of the aircraft stability. Compact and light-weight with stability is very important for avionics system. Actuator and controller are integrated for the lightweight and compact system, but electrical componentss increasing installed in limited size results in increasing thermal density. In this paper, thermal simulation was performed using ANSYS ICEPAK for the thermal reliability analysis of integrated electro-mechanical actuator.
햅틱보조설계 기반의 설계변수 조절이 가능한 햅틱의자의 설계
허석행(Seok-Haeng Huh),김영걸(Yong-Jie Jin),송재복(Jae-Bok Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In modern society, people tend to spend their time on various types of chairs. However, it is not easy for a designer to design a comfortable chair, because satisfaction with the chair depends not only on the quantitative elements such as size, but also on the qualitative element such as the user’s feeling. To deal with these problems, there have been many studies on designing an ergonomics chair. In this paper, the hapticaided design (HAD) system was adopted to design the ergonomics chair. Based on the HAD system, the designer can experience whether the chair is comfortable or not through the haptic device, and also can modify the design parameters instantaneously. The haptic chair capable of controlling the design parameters in real time was proposed as a haptic simulator. The controllable parameters such as the seat height, reclining angle, stiffness of the backrest, and so on were selected based on the previous researches related to ergonomics chairs. It will reduce the development cost and time by replacing the process of making the real mock-up and prototype with the haptic chair.
Accelerated Life Analysis and Endurance Verification of Electro-Mechanical Actuator
허석행(Seok Haeng Huh),이병호(Byung Ho Lee),설진운(Jin Woon Seol),백주현(Joo Hyun Baek),양명석(Myung Seok Yang),권준용(Jun Young Kwon) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.10
Electro-Mechanical Actuator installed on the aircraft plays a key role in an aircraft’s flight control through flight control computer. Reliable prediction of the actuator is important for the aircraft. To estimate the lifetime of a product, it is necessary to test full target life. However, it is very difficult to perform it due to the long life time of actuator but short period of development time with increasing cost. Therefore, accelerated life test has been used to reduce the test time for various reasons such as reducing product’s development cycle and cost. In this paper, to predict the lifetime of the actuator, we analyzed the flight profile of aircraft and adapted the method of accelerated life test in order to accelerate failure modes that might occur under user conditions. We also set up an endurance test equipment for validating the demanded lifetime of an actuator and performed accelerated life test.
김태형(Taehyung Kim),설진운(Jin Woon Seol),허석행(Seok Haeng Huh),백주현(Joo Hyun Baek) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.9
In this paper, a study on the effectiveness of micro-peening was accomplished for improvement of fatigue characteristics for reduction gear of manned and unmanned aircraft. The Almen saturation curve was obtained by various peening injection pressure supplied from a commercial air jet peening machine. The effective micro-peening process condition was adopted as five bar. The four points rotary bending fatigue test was conducted by using test specimen made of AISI alloy that was carburized based on AMS standard in this work. From the fatigue test result, the fracture life of specimen peened by nozzle pressure with five bar and six bar was higher than the un-peened specimen by approximately 323 percent and 146 percent respectively. However, the fracture life of specimen peened by the nozzle pressure with six bar was lower by approximately 221 percent than the peened specimen by five bar. For this reason, the peening nozzle pressure with five bar was decided as the optimum micro-peening condition. Effectiveness of micro-peening was validated and this micropeening technique will be used for real manned and unmanned aircraft gear parts or other durability mechanical parts.
군집 로봇의 임무 검증 지원을 위한 디지털 트윈 기반 통신 최적화 기법
김관혁 ( Gwanhyeok Kim ),김한진 ( Hanjin Kim ),권준형 ( Junhyung Kwon ),하범수 ( Beomsu Ha ),허석행 ( Seok Haeng Huh ),구지훈 ( Jee Hoon Koo ),손호정 ( Ho Jung Sohn ),김원태 ( Won-tae Kim ) 한국정보처리학회 2023 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.12 No.1
로봇은 군사 분야로까지 활용 범위를 넓히며 다가올 미래전에서 감시경계, 적군 탐지 등 중요한 임무를 맡게 될 것으로 전망된다. 군집 로봇은 다수라는 장점으로 단일 로봇이 수행하기 어렵거나 오랜 시간이 소요된 임무를 보다 효율적으로 수행할 수 있다. 상호 간 인지 및 협업이 필수인 군집 로봇은 방대한 데이터를 주고 받으며, 이로 인해 SW의 검증이 점점 더 어려워지고 있다. 임무 검증의 신뢰성을 높이기 위해 사용하는 Hardware-in-the-loop simulation은 복잡한 군집 로봇의 SW 검증을 가능하게 하나, HILS 장치와 시뮬레이터 간 주고 받는 검증 데이터의 양이 검증 대상 시스템 수에 따라 기하급수적으로 증가하여 통신 과부하가 발생할 수 있다. 본 논문에서는 군집 로봇의 임무 검증에서 발생하는 통신 과부하 문제를 해소하기 위해 디지털 트윈 기반의 통신 최적화 기법을 제안한다. 제안하는 Digital Twin based Multi HILS Framework 하에서 Network DT은 Network Controller 알고리즘을 통해 임무 시나리오에 따라 각 로봇에게 네트워크 자원을 효율적으로 할당할 수 있으며, 군집에 참여하는 개별 로봇들이 요구하는 Sensor Generation Rate를 모두 만족시킬 수 있음을 확인하였다. 또한 데이터 전송에 대한 실험 결과 패킷 손실 비율을 기존 15.7%에서 약 0.2%로 감소시킬 수 있었다. Robots are expected to expand their scope of application to the military field and take on important missions such as surveillance and enemy detection in the coming future warfare. Swarm robots can perform tasks that are difficult or time-consuming for a single robot to be performed more efficiently due to the advantage of having multiple robots. Swarm robots require mutual recognition and collaboration. So they send and receive vast amounts of data, making it increasingly difficult to verify SW. Hardware-in-the-loop simulation used to increase the reliability of mission verification enables SW verification of complex swarm robots, but the amount of verification data exchanged between the HILS device and the simulator increases exponentially according to the number of systems to be verified. So communication overload may occur. In this paper, we propose a digital twin-based communication optimization technique to solve the communication overload problem that occurs in mission verification of swarm robots. Under the proposed Digital Twin based Multi HILS Framework, Network DT can efficiently allocate network resources to each robot according to the mission scenario through the Network Controller algorithm, and can satisfy all sensor generation rates required by individual robots participating in the group. In addition, as a result of an experiment on packet loss rate, it was possible to reduce the packet loss rate from 15.7% to 0.2%.