• Title/Summary/Keyword: cushion

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A Study on the Injury Criteria of the Occupant Protection Performance of Crush Cushions (충격흡수시설의 탑승자보호 성능평가 기준에 관한 연구)

  • Lim, Jae-Moon;Jung, Geun-Seup
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.2
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    • pp.49-57
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    • 2008
  • The performance of crash cushion systems is certified through the full scale crash tests by the standard for installation and maintenance guidelines for roadside safety appurtenance. The impact severities of impacting vehicles in collision with crash cushion systems are rated by indices THIV and PHD. Crash test results are considered to study the performance of three crash cushion systems. In case of the frontal impact or the offset frontal impact, the results show that THIV values of three systems are very close to the threshold limit for the occupant protection. Also, the results show that PHD would be improper for the occupant protection performance index. In order to improve the occupant protection performance of crash cushions, ASI needs to be included in the impact severity index.

Modeling & Simulation of a Hydraulic Servo Actuator Cushion for Power Plants (발전소용 유압 서보액추에이터의 쿠션 모델링 및 시뮬레이션)

  • Lee, YongBum;Yoon, Young Hwan
    • Tribology and Lubricants
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    • v.29 no.1
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    • pp.7-12
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    • 2013
  • Turbine power control devices at a nuclear / thermoelectric power plant lead to failure by creating mechanical shocks and strong vibrations that are due to the strong elasticity of a spring and the inertia of the valve face during its rapid movement to block steam. To ensure durability of the turbine power control device, which is the main component in the power plant, it is necessary to develop a device that can prevent such vibrations. In this study, a cushion mechanism is added to the head of the hydraulic servo actuator, which is a turbine power control device. Moreover, the cushion mechanism, which includes various modifies shapes and orifices is investigated dynamically through modeling and simulations.

Design of Strip Bridge for Unsymmetrical Progressive Stamping for an Automotive Seat Side Cushion Pane (자동차 시트 사이드 쿠션 패널의 비대칭 프로그레시브 스탬핑 성형을 위한 스트립 브릿지 설계)

  • Hong, S.;Joung, C. S.;Choi, B. S.;Lee, D. Y.
    • Transactions of Materials Processing
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    • v.24 no.6
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    • pp.400-404
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    • 2015
  • For mass production of stamped parts, which require complicated in-press operations, it is always advisable to use a progressive die set. It is difficult to choose a progressive die set if the stamped parts need to be deep drawn and especially if they are unsymmetrical. Because unsymmetrical deep drawing parts are very sensitive to the effect of weight during moving to the next step, they are hard to exactly locate on the die face. An automotive seat side cushion panel is about 80mm high, unsymmetrical and its low edge needs hemming, so it is hard to produce even using a progressive die set. In the current paper a progressive stamping for seat side cushion panel was examined. Five strip bridges were considered to be strong enough to move to the next die as predicted by the CAE analysis.

A Study on the Design of a Low-Friction, High-Speed Pneumatic Cylinder (저마찰 고속형 공기압 실린더의 설계에 관한 연구)

  • Kim, Do-Tae;Kim, Dong-Soo;Ju, Min-Jin
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1230-1235
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    • 2008
  • Of all of pneumatic components utilized in the make up of pneumatic circuits on either automatic assembly machine or industrial equipment, the pneumatic cylinder is more oriented toward being a structural as well as a pneumatic member. The structural design must be based to a large degree on the end of application of the cylinder on the equipment it is operating. In this paper, design studies of a double-acting pneumatic cushion type cylinder with low-friction and high-speed driving have been developed. Of interest here is to investigate the structural analysis of cylinder tube, piston rod, end cover, and to analyze the buckling of piston rod. Also, a relief valve type cushion mechanism is considered. This cushion mechanism is found to be adequate under a high-speed driving of pneumatic cylinders.

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An analysis on the injection mold simulation of single cushion pact cosmetic container for the friendly-environment and high productivity (친환경 고생산성을 위한 단일 쿠션 팩트 내 화장품 용기의 사출 시뮬레이션 분석)

  • Jung, Sung-Taek;Kim, Seong-Hyun;Kim, Hyun-Jeong;Lee, Joong-Bae;Baek, Seung-Yub
    • Design & Manufacturing
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    • v.12 no.2
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    • pp.51-56
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    • 2018
  • Generally, The women was used in the cosmetic cushion fact. It has developed with the consideration of manufacturing. In this study, we designed green-friendly and element parts lower and single cushion fact containers using a single material. Injection mold simulation were performed using on 3D design data. The injection mold simulation used the data (Injection time / Cooling time / Temperature / Pressure) in the injection mold parameters. In addition, the sink mark phenomenon in the simulation results is analyzed as a problem due to the thickness and further research is needed in the future.

An Observation of the Application of a Magnetic Force to the Bicycle Cushion System and its Nonlinearity (자석 척력의 자전거 쿠션장치 적용 및 비선형성 고찰)

  • Yun, Seong-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.1
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    • pp.42-47
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    • 2018
  • This paper describes the dynamical behavior of the bicycle and its nonlinear effect when magnetic repulsive forces are applied to the bicycle cushion system. A finite-element method was used to obtain its reliabilities by comparing the experimental and numerical values and select the proper magnet sizes. The Equivalent spring stiffness values were evaluated in terms of both linear and nonlinear approximations, where the nonlinear effect was specifically investigated for the ride comfort. The corresponding equations of linear and nonlinear motion were derived for the numerical model with three degrees of freedom. Dynamic behaviors were observed when the bicycle ran over a curvilinear road in the form of a sinusoidal curve. The analysis in this paper for the observed nonlinearity of magnetic repulsive forces will be a useful guide to more accurately predict the cushion design for any vehicle system.

A Study on the Design of a High-Speed Pneumatic Cushion Cylinder (고속 공기압 쿠션 실린더의 설계에 관한 연구)

  • Kim, Do-Tae;Kim, Dong-Soo;Ju, Min-Jin
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.5
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    • pp.491-497
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    • 2009
  • Of all of pneumatic components utilized in the make up of pneumatic circuits on either automatic assembly machine or industrial equipment, the pneumatic cylinder is more oriented toward being a structural as well as a pneumatic member. The structural design must be based to a large degree on the end of application of the cylinder on the equipment it is operating. In this paper, design studies of a double-acting pneumatic cushion type cylinder with low-friction and high-speed driving have been developed. Of interest here is to investigate the stress and strain analysis of cylinder tube, piston rod, end cover, and to analyze the buckling of piston rod. A finite element analysis is carried out to compute the distribution of the displacement, stress and safety factors by using ANSYS. As a result, the structural safety factors of each parts in pneumatic cushion cylinder are evaluated and confirmed at the design specifications.

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Motion Characteristics of Hydraulic Actuator with Various Cushion Shapes (쿠션 형상 변화에 따른 유압 액추에이터 작동 특성 연구)

  • Kim, Jin-Hyoung;Kang, Hyun-Su;Han, Su-Min;Kim, Youn-Jea
    • The KSFM Journal of Fluid Machinery
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    • v.18 no.2
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    • pp.48-53
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    • 2015
  • Hydraulic actuator is a primary component of the hydraulic valve systems. This paper describes a motion characteristic of hydraulic actuator with various configurations of cushion. It plays an important role in protecting the actuator from the shock when the piston reaches the end position. Numerical analyses were conducted by using commercial code, ANSYS with k-${\varepsilon}$ turbulent model. The results for pressure and velocity distributions in the hydraulic actuator with different cushion shapes were graphically depicted.

Study on Behavior Analysis of Crash Cushion Using Analysis Data of High-Speed Camera (고속카메라 영상분석 데이타를 이용한 충격흡수시설의 충돌거동 분석에 관한 연구)

  • Jang, Dae-Young;Ko, Man-Gi;Lee, Yoon-Ki;Joo, Jae-Woong
    • International Journal of Highway Engineering
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    • v.11 no.2
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    • pp.75-83
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    • 2009
  • Collision behavior of clash cushion occurs for a second of less than 0.4sec usually so that it is too hard to calculate numerically. Therefore, for development of trash cushion, it rely on full-scale vehicle crash test without any design procedure. Occupant safety indices if calculated from acquired data by data measurement system and collision behavior of vehicle and crash cushion is filming using high-speed camera in the crash test. But practical ufo scope of high-speed camera is limited and it is not using to calculated the occupant safety indices or analyzed the energy dissipated mechanism of crash cushion. This work is to estimate to be suitable or not for compare the data from measurement system with the data from high-speed camera. And also it is to grope for practical use scheme to calculation of occupant safety indices or analysis of collision behavior.

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An Analysis of Relationship between Cushion Gas and Gas Withdrawal in Depleted Gas Reservoir as a Gas Storage (고갈가스전의 가스저장전 전환 시 쿠션가스와 가스재생산율과의 관계 분석)

  • Han, Jeongmin;Kim, Joohyung;Sung, Wonmo
    • Journal of the Korean Institute of Gas
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    • v.17 no.2
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    • pp.9-20
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    • 2013
  • Depleted gas reservoir has been already explored and its geologic data, along with its reservoir properties, are already known through seismic exploration and drilling. Therefore it would be less difficult to develope a gas storage from depleted gas reservoir. Cushion gas which remains in the reservoir to maintain pressure affects withdrawal rate of working gas in underground gas storage. In this study, we attempted to investigate the relationship between cushion gas and withdrawal rate using a commercial simulator. From the analyses of the results, it is found that the minimum limit for a cycle of 5-month injection and 5-month withdrawal is 10 wells with 50% cushion gas, and 12 wells with 60% cushion gas for a cycle of 7-month injection and 3-month withdrawal.