• Title/Summary/Keyword: flexible part

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Development Test for Flexible PTO Shaft Made of Ti Alloy for Aircraft (Ti 합금을 이용한 항공기용 Flexible PTO 샤프트 개발 시험)

  • Lee, Joo Hong;Kang, Bo Sik;Yu, Hyun Seok;Lee, Ji Man;Cho, Hae Yong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.40 no.8
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    • pp.759-765
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    • 2016
  • The PTO (Power Take-Off) shaft for aircraft, with welded construction using multiple thin membranes, was developed in the 1950s to improve the elasticity of the part. As it is lightweight, stable at high speeds, and has good flexibility, it is used in most of the fighter aircraft. It connects the AMAD (aircraft mounted accessory drive) gearbox with the EMAD (engine mounted accessory drive) gearbox and transmits the rotational power between them. It operates in the high speed range of 10,000-18,000 rpm. In this study, the safety of the PTO shaft made of Ti alloy was investigated using finite element analysis, and the ability to transmit power was demonstrated through a high-cycle fatigue test conducted in a laboratory. Further, the life of the ball joints of the aircraft under high-cycle fatigue test conditions was predicted, and the wear characteristics were analyzed.

A study on the shock & vibration characteristics of a tractor-trailer type vehicle system running on the road (트랙터-트레일러형 차량 시스템의 주행 충격진동 특성에 관한 연구)

  • 김종길
    • Journal of the Korea Institute of Military Science and Technology
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    • v.4 no.1
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    • pp.13-19
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    • 2001
  • It is known that displacements, velocities and accelerations of the tractor- trailer type vehicle system in shock & vibration analysis by the flexible-multi-body dynamics including the flexibility of structure are bigger and more repetitive than them by the rigid-multi-body dynamics, and it is necessary to prove above results by the experimental field test. Therefore, in this paper, theoretical analysis by the flexible-multi-body dynamics and experimental field test for a tractor-trailer type vehicle system are conducted and their results are compared with each other. Because of unexpected metal contact and impact in the air coupler part in the field test, some accelerations measured from the experimental field test are bigger than them analyzed from the theoretical analysis, but most accelerations are well coincide with each other in the amplitudes and trends. Thus more refined dynamic analytical models for some special type vehicle systems will be possible in the future.

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A Supply Chain Management based on Mobile Agents with Flexible Reply Scheme (유연한 응답 기능을 가지는 이동 에이전트에 기반을 둔 공급 체인 관리)

  • Jeong, Won-Ho;Nam, Hui-Jeong
    • The KIPS Transactions:PartD
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    • v.8D no.4
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    • pp.439-450
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    • 2001
  • Mobile agent is one of the promising ways of overcoming network load and latency. It is also a new software paradigm including those concepts of client/server, applet/servelet, and code-on-demand. In this paper, a new mobile agent concept with flexible replay scheme is proposed, which can deal with embarrassing situation when replying results should be accomplished in various distributed applications. For example, they are 1) a burden of bulky result, 2) a need of different replay scheme dependent on work type, 3) connection failure to the target node, and 4) a need of fast migration to next node to keep the itinerary. Regarding the source node, there may be another situation that it wants to be aware of whether its wi가 is completed or not. Three kinds of reply schemes are proposed for dealing flexibly with such situations. They are based on priority reply list where nodes to be replied are stored according to their priorities. An experimental supply chain management model using the proposed reply schemes is designed and implemented. It is one of good distributed applications appropriate for our reply schemes, because it requires different reply schemes according to work types and it is important to gather required information in time.

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A Study of Fuel Pump Durability on the Bio-ethanol for FFV(Flexible Fuel Vehicle) System (바이오에탄올 연료에 대한 FFV(Flexible Fuel Vehicle)용 연료펌프모터의 내구성에 관한 연구)

  • Kim, Chang-Soo;Kwak, Dong-Ho;Jung, Byung-Jun;Kim, Jong-Myung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.6
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    • pp.107-112
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    • 2011
  • FFV(Flexible Fuel Vehicle) is the vehicle that can be used liberally from gasoline to E100(Ethanol 100%) for fuel. Recently, interest in the bio-fuel is increased by the environmental factors like exhaustion of the fossil fuel and ruduction of greenhouse gases. For the reason, adopting of FFV is activated in the world including North and South America. In general, bio-ethanol has highly corrosive substance in compare with gasoline. In the part of fuel system, corrosion can make a safety problem in case of fuel leakage and engine starting problem. So the fuel system of FFV have to be made of high corrosion-resistant materials. This study examined the effect of bio-ethanol on the durability properties according to component materials in FFV fuel pump motor and regulator using the High Temperature Fuel Circulation Test.

Proactive Operational Method for the Transfer Robot of FMC (FMC 반송용 로봇의 선견형 운영방법)

  • Yoon, Jung-Ik;Um, In-Sup;Lee, Hong-Chul
    • Journal of the Korea Society for Simulation
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    • v.17 no.4
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    • pp.249-257
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    • 2008
  • This paper shows the Applied Q-learning Algorithm which supports selecting the waiting position of a robot and the part serviced next in the Flexible Manufacturing Cell (FMC) that consists of one robot and various types of facilities. To verify the performance of the suggested algorithm, we design the general FMC made up of single transfer robot and multiple machines with a simulation method, and then compare the output with other control methods. As a result of the analysis, the algorithm we use improve the average processing time and total throughputs as well by increasing robot utilization, reversely, by decreasing robot waiting time. Furthermore, because of ease of use compared with other complex ways and its adoptability to real world, we expect that this method contribute to advance total FMC efficiency as well.

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Fabrication and Evaluation of the Flexible and Implantable Micro Electrode (생체 삽입형 유연한 마이크로 전극의 제작 및 평가)

  • Baek Ju-Yeoul;Kwon Gu-Han;Lee Sang-Woon;Lee Ky-Am;Lee Sang-Hoon
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.2
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    • pp.93-99
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    • 2006
  • In this paper, we fabricated and evaluated polydimethylsiloxane(PDMS)-based flexible and implantable micro electrodes. The electrode patterning was carried out with the photolithography and chemical etching process after e-beam evaporation of 100 ATi and 1000 A Au. The PDMS substrate was treated by oxygen plasma using reactive ion etching(RIE) system to improve the adhesiveness of PDMS and metal layers. The minimum line width of fabricated micro electrode was 20 $\mu$m. After finished patterning, we did packaging with PDMS and then brought up the electrode's part about 40 $\mu$m with gold electroplating. The Hank's balanced salt solution(HBSS) test was carried out for 6 month for endurance of fabricated micro electrode. We carried out in-vivo test for the evaluation of biocompatibility by implanting electrodes under the ICR mouse skin for 42 days.

Development of Anthropomorphic Robot Hand with Tactile Sensor: SKKU Hand II (촉각센서를 갖는 인간형 로봇손의 개발: SKKU Hand II)

  • Choi Byung-June;Lee Sang-Hun;Kang Sung-Chul;Choi Hyouk-Ryeol
    • Journal of Institute of Control, Robotics and Systems
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    • v.12 no.6
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    • pp.594-599
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    • 2006
  • In this paper an anthropomorphic robot hand called SKKU Hand IIl is presented, which has a miniaturized fingertip tactile sensor. The thumb is designed as one part of the palm and multiplies the mobility of the palm. The fingertip tactile sensor, based on polyvinylidene fluoride (PVDF) and pressure variable resistor ink, is physically flexible enough to be deformed into any three-dimensional geometry. In order to detect incipient slip, a PVDF strip is arranged along the direction normal to the surface of the finger of the robot hand. Also, a thin flexible sensor to sense the static force as well as the contact location is fabricated into an arrayed type using pressure variable resistor ink. The driving circuits and the tactile sensing systems for the SKKU Hand II are embedded in the hand. Each driving circuit communicates with others using CAN protocol. SKKU Hand II is manufactured and its feasibility is validated through preliminary experiments.

Dynamic Analysis of Constrained Mechanical System Moving on a Flexible Beam Structure(II) : Application (유연한 보 구조물 위를 이동하는 구속 기계계의 동력학 해석(II) : 응용)

  • Park, Chan-Jong;Park, Tae-Won
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.176-184
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    • 2000
  • Recently, it becomes a very important issue to consider the mechanical systems such as high-speed vehicle and railway train moving on a flexible beam structure. Using general approach proposed in the first part of this paper, it tis possible to predict planar motion of constrained mechanical system and elastic structure with various kinds of foundation supporting condition. Combined differential-algebraic equations of motion derived from both multibody dynamics theory and Finite Element Method can be analyzed numerically using generalized coordinate partitioning algorithm. To verify the validity of this approach, results from simply supported elastic beam subjected to a moving load are compared with exact solution from a reference. Finally, parameter study is conducted for a moving vehicle model on a simply supported 3-span bridge.

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Performance Models of Multi-stage Bernoulli Lines with Multiple Product and Dedicated Buffers (다품종 제품과 전용 대기공간을 고려한 다단계 베르누이 라인을 위한 성능 모델)

  • Park, Kyungsu;Han, Jun-Hee;Kim, Woo-Sung
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.44 no.3
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    • pp.22-32
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    • 2021
  • To meet rapidly changing market demands, manufacturers strive to increase both of productivity and diversity at the same time. As a part of those effort, they are applying flexible manufacturing systems that produce multiple types and/or options of products at a single production line. This paper studies such flexible manufacturing system with multiple types of products, multiple Bernoulli reliability machines and dedicated buffers between them for each of product types. As one of the prevalent control policies, priority based policy is applied at each machines to select the product to be processed. To analyze such system and its performance measures exactly, Markov chain models are applied. Because it is too complex to define all relative transient and its probabilities for each state, an algorithm to update transient state probability are introduced. Based on the steady state probability, some performance measures such as production rate, WIP-based measures, blocking probability and starvation probability are derived. Some system properties are also addressed. There is a property of non-conservation of flow, which means the product ratio at the input flow is not conserved at the succeeding flows. In addition, it is also found that increased buffer capacity does not guarantee improved production rate in this system.

조립부품의 분리도및 불안정도를 이용한 Turning device의 설계에관한 연구

  • 신철균;조형석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.04b
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    • pp.257-261
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    • 1993
  • This paper presents a design method of turning device for robotic assembly based on the verification of a instability for a base assembly. To derive the instability, first we inference collision free assembly directions by extracting separable directions for the part, and calculate the separability which gives informations as to how the part can be dasily separated. Using the result, we determine the instability evaluated by summing the all separabilites of each component part in base assembly. The proposed method gives a design guidance of turning device by evaluating a degree of the motion istability for the base assembly in flexible manufacturing application. An example is given to illustrate the concepts and procedure of the proposed scheme.