• Title, Summary, Keyword: 공압 시스템

Search Result 197, Processing Time 0.049 seconds

Expert System for the Design of Pneumatic Systems (공압설계를 위한 전문가시스템)

  • 신흥열;이재원
    • Journal of Intelligence and Information Systems
    • /
    • v.3 no.1
    • /
    • pp.13-30
    • /
    • 1997
  • 인공지능 분야 중 하나의 전문시스템 기술은 현재 산업현장에서 여러 가지 분야의 문제 해결에 이용되고 있다. 본 논문은 공압설계를 자동화하기 위한 전문가시스템 PDES(Pneumatic Design Expert System)의 프로토타입 개발에 관한 것이다. 공압설계를 위한 요구 조건이 시스템의 입력정보로 제공되면 공압설계 시방과 공압회로도, 공압작업요소의 영상이 시스템의 출력으로 제시된다. PDES의 지식 베이스는 산업분야 전문가의 전문지식과 경험적 지식을 획득, 분석하여 전문가 시스템 쉘을 이용하여 구성하였으며 추론전략으로는 전향추론을 적용한 규칙기반추론(Rule-Based Reasoning)을 이용하였다. PDES는 공압설계시 설계 업무를 자동화 하여 능률을 향상시켜 줄 뿐만 아니라 공압 관련 비전문가가 공압설계를 할 때에는 큰도움을 줄 수 있다.

  • PDF

Estimation of Feeding Performance of Pneumatic System (공압시스템의 공급능력 예측기법)

  • Cho, Nam-Kyung;Chung, Yong-Gahp;Shin, Dong-Soon;Cho, In-Hyun
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.13 no.5
    • /
    • pp.29-40
    • /
    • 2009
  • Pneumatic system is widely applied to ground facility and launcher on-board system. One of the important aspects of pneumatic system is to meet pressure and flow rate requirements of gas consumers. In this paper, a systematic analytical approach for pneumatic system is proposed, which uses and systematically combines previous studies. The proposed analytical method is that pressure/flow calculation using conservation equations are combined with sonic limit check at vena contracta of the components of pneumatic system, which checks the installed components whether they are merely pressure loss elements or flow limiting element of the system. In this paper, gas consumers are categorized and simulated using the proposed method. The results reveal that the feeding performance of general pneumatic system can be properly estimated using the proposed approach.

Development of the Hybrid Type Robot Using a Pneumatic Actuator For Physical Therapy Of Ankylosis (관절 경직 환자의 물리 치료를 위한 공압 구동형 하이브리드 로봇 개발)

  • 최현석;최철우;한창수;한정수
    • Journal of Biomedical Engineering Research
    • /
    • v.24 no.2
    • /
    • pp.127-132
    • /
    • 2003
  • In this paper. the pneumatic service robot with a hybrid type is developed. A pneumatic has the advantages of good compliance , high Payload-to-weight and payload-to-volume ratios. high speed and force capabilities. Using pneumatic actuators. which have low stiffness. the service robot can guarantee safety. By suggesting a new serial-parallel hybrid type for the service robot which separates into Positioning motion and orienting motion, we can achieve large workspace and high strength-to-moving-weight ratio at the same time. A sliding mode controller can be designed for tracking the desired output using the Lyapunov stability theory and structural properties of pneumatic servo systems. Through many experiments of circular trajectory. the Pneumatic service robot is evaluated and verified.

암반공압파쇄에 의한 지하수위 변화 분석

  • 김혜빈;부성안;김진성;김종태;정교철
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • /
    • pp.119-122
    • /
    • 2004
  • 농어촌연구원 내 화강암질편마암지층에 2차에 걸쳐 3공에 대한 공압파쇄 시험 결과 B-1공은 점토성분의 파쇄대 충진으로 수량이 도리어 감소하였다. 공압파쇄 시험 중 파쇄 도달거리를 측정한 결과, P-2 공은 50m 거리에 위치한 B-1공에서의 공압파쇄시험 중에는 약 0.6m의 수위상승이 있었고, 20m 거리에 위치한 B-2공에서의 공압파쇄시험 중에는 약 3.1m의 수위가 상승하였다. 이는 공압파쇄의 유효거리가 암반층에서는 6~15m 정도라고 알려져 있으나 파쇄구간의 발달 정도에 따라 50m 이상 압축공기가 전달됨을 알 수 있다.

  • PDF

Pressure Drop Characteristics and Control Method of Pneumatic Regulator for Gas Supply (공압 레귤레이터의 공급시 압력강하 특성 및 제어방법)

  • Cho, Nam-Kyung;Chung, Yong-Gahp;Nam, Jung-Won;Cho, In-Hyun
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • /
    • pp.347-352
    • /
    • 2009
  • Pneumatic system is widely applied to ground facility and launcher on-board system. The main requirements of pneumatic system is to meet pressure and flow requirements of gas consumers. For launcher related applications, different from other applications, very high flow is required which can leads to supply pressure drop against required setting pressure. The supply pressure decrease is closely related to regulator characteristics. In this paper, the characteristics of pneumatic regulator related to supply pressure decrease and the control methods for reducing the pressure offset are reviewed.

  • PDF

Estimation of Stroke Volume Based on Air Pressure in Air Tube with Pneumatic Pulsatile Ventricular Assist Device (공압식 박동형 심실보조장치에서 공압관 내 공기압에 따른 박출량 추정)

  • Kang, Yu Min;Lee, Jin Hong;Her, Keun;Choi, Seong Wook
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.38 no.12
    • /
    • pp.971-974
    • /
    • 2014
  • A ventricular assist device (VAD) is used for bridge to heart transplantation and heart diseases. Knowing the status of a pneumatic pulsatile VAD when implanting it into the body is important: when the velocity of blood flow through the VAD is slow, a thrombus may occur, and thrombosis can be fatal to a patient. In order to determine the state of a VAD, various sensors need to be implanted. Because this introduces the risk of infection and difficulties with sensor management, we developed a method for estimating the state of a VAD indirectly via the pressure in an air tube that can be measured in vitro. We compared the measured values to in vitro experimental results. The estimated and measured values showed some errors, but the accuracy can be improved by refining the estimation process to minimize the risk of infection.

Optimization of Design Parameters for Lock-Claws of Pneumatic Fitting Using Taguchi Method (다구찌기법을 이용한 공압피팅용 원형 판스프링의 설계변수 최적화)

  • Kwon, Tae Ha;Suh, Chang Hee;Lee, Rac Gyu;Oh, Sang Kyun;Jung, Yun-Chul;Lim, Hwan Bin
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.37 no.12
    • /
    • pp.1541-1546
    • /
    • 2013
  • The stress concentration of lock-claws, which are one of the important parts for pneumatic fitting for a flexible tube connection, was investigated by finite element simulation. In this study, the generation of the local plastic deformation was predicted when the tube was hooked up to a pneumatic fitting in order to disperse the stress concentration, and design optimization was carried out using the Taguchi method. For the optimization, the outer width, bending angle, and inner radius of the lock-claws are used as main variables. As a result, their respective contribution ratios are revealed as 81.3%, 10.9%, and 1.5%. The ratio of the total stress distribution was improved by 4% compared with the initial design of the lock-claws.

Fine Gap Control Using Pneumatic Servo System (공압서보시스템에 의한 미세 간극제어 시스템 설계)

  • 김동환;김영진;정대화
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.19 no.12
    • /
    • pp.45-56
    • /
    • 2002
  • A pneumatic servo system requiring a fine gap control in a photo-electric sensor which is used for a LCD array detection device is introduced. The gap controlled by the pneumatic servo system remains within around 50~80 ${\mu}{\textrm}{m}$, and the system possesses an effect to eliminate undesirable particles on the LCD plate by blowing air out. The air flow rate is initially controlled by a servo valve and expanded by a booster valve, thus the controlled air pressure contributes to maintaining an appropriate gap between the LCD plate and photo-electric sensor An air floating plate of two degrees of freedom is designed and fabricated, and a fine tilting motion control is also implemented by assigning different gap commands. The pressure control and direct gap control are proposed, and each performance is verified experimentally.

Contact Pressure of Non-Pneumatic Tires with Auxetic Honeycomb Spoke (음의 각을 가지는 허니컴 스포크를 사용한 비 공압타이어의 접지압 분포)

  • Kim, Kwangwon;Kim, Dooman
    • Journal of Aerospace System Engineering
    • /
    • v.4 no.2
    • /
    • pp.1-9
    • /
    • 2010
  • An airless tire has advantages over the conventional pneumatic tire in terms of flat proof and maintenance free. According to the recently disclosed inventions on the airless tire, non-pneumatic tire (NPT) consists of the flexible polygon spokes. Considering the NPT structure, the spokes undergo the tension-compression cyclic loading while the tire rolls. Therefore the spokes of NPT are required to have both stiffness and resilience under the cyclic tensile-compressible loading. In general, if a material has a high stiffness, it shows a low elastic strain limit. In this paper, using the auxetic honeycomb structure with negative poissons's ratio, the spokes of NPT tire are designed to have both stiffness and resilience. Finite element based numerical simulation of the contact pressure of a NPT is carried out with ABAQUS.

  • PDF