http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Study on Gap Height Measurement of Radial Slit Using Pneumatic System
Kousuke Mitsuhashi,Chongho Youn,Toshiharu Kagawa 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
Flame arresters are required to assure safe handling of flammable gases in industrial plants. In this paper, we propose a new type of frame arrester in which a radial slit–type device of overlapping parallel discs is used to quench flames. If the gap height of the radial slit is even slightly too large, a flame cannot be quenched. Moreover, there is the possibility that the gap height is not homogeneous. With current measurement methods, only the gap height at the outlet can be measured, and the inside state of the gap cannot be determined. Therefore, in this study, we propose a measurement method using a jet, and a Pitot tube to determine the gap height, including the state inside the gap. Based on a theoretical analysis of the radial flow field in the slit, we fin d that the dynamic pressure in the leaving the gap is proportional to the fourth power of the gap height. Therefore, to accurately determine gap height, we propose a method for measuring the dynamic pressure in the let discharged from the slit. The effectiveness of the method was confirmed by measuring radial slits of known heights, and the method can be used to measure radial slits to an accuracy of several micrometers.
The Error Analysis of Leak Measurement for Pneumatic Cylinder Using Isothermal Chamber
장지성,Sangwon Ji,Toshiharu Kagawa 사단법인 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.1
ISO pneumatic cylinder reliability test requires air leakage measurement. Air cylinder has many parts and the leakage shall be measured before, during and after endurance test, and, the leakage should smaller than the specified value. The existing measurement method needs complex operation and the calibration of leak detector, and, has to separate the testing cylinder from endurance test device, which causes the change of contact condition of seal in the cylinder. Therefore, it is hard to evaluate the air leakage during endurance test, and guarantee the reliability of the conventional measurement method. In this paper, a new method for air leakage measurement using isothermal chamber, which does not requires calibration or temperature compensation, and, can measure air leakage accurately with quite simple operations, is proposed. As a result, reliability of air leakage measurement can be improved because the proposed method does not have to separate the testing cylinder from the endurance test device for air leakage measurement. The effectiveness of the proposed method is proved by error analysis of leak measurement from experimental result.
Effective feedback algorithm for application of MI-simulation to turbulent orifice flow
Mitsuhiro Nakao,Kenji Kawashima,Toshiharu Kagawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Measurement-integrated simulation (MI-simulation) is a numerical simulation in which experimental results are fed back to the simulation. The calculated values become closer to the experimental values. In this paper, we propose a new feedback method based on the conservation of momentum for MI-simulation built-in standard k-εmodel to turbulent orifice flow. The axial velocities in simulation are compensated by using proportional controllerusing the estimated pressure distribution based on the conservation of momentum. The signals are fed back to the axial velocity control volumes in the cross section downstream of the orifice. The effectiveness of the method was confirmed compared with the experimental results at downstream of orifice.
The Error Analysis of Leak Measurement for Pneumatic Cylinder Using Isothermal Chamber
Jiseong Jang,Sangwon Ji,Toshiharu Kagawa 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.1
ISO pneumatic cylinder reliability test requires air leakage measurement. Air cylinder has many parts and the leakage shall be measured before, during and after endurance test, and, the leakage should smaller than the specified value. The existing measurement method needs complex operation and the calibration of leak detector, and, has to separate the testing cylinder from endurance the air leakage during endurance test, and guarantee the reliability of the conventional measurement method. In this paper, a new method for air leakage measurement using isothermal chamber, which does not requires calibration or temperature compensation, and, can measure air leakage accurately with quite simple operations, is proposed. As a result, reliability of air leakage measurement can be improved because the proposed method does not have to separate the testing cylinder from the endurance test device for air leakage measurement. The effectiveness of the proposed method is proved by error analysis of leak measurement from experimental result.
Modeling of Gas Governor System with Venturi
Kunio Okada,Tomoaki Takeuti,Chongo Youn,Toshiharu Kagawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The AFV is often used as gas governor to control pressure in gas pipeline. The AFV has a pilot line to control the downstream pressure. The pilot line consists of pilot valve and restrictor. An orifice or venturi is used for the restrictor. However, the modeling of pilot line with venturi is not studied yet. In this paper, we investigate the characteristics of the pilot line with venturi, and propose the modeling of pilot line. The characteristics of venturi and pilot valve are examined by using the pneumatic system. The effectiveness of the proposed modeling was confirmed by experiment.