• The Journal of Natural Sciences
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• v.8 no.1
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• pp.27-32
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• 1995

Magnetic Resonance Imaging anti-solenoid probes have been constructed for the internal imaging. Signal-to-noise ratios of the images acquired by the anti-solenoid probes were compared with those obtained by commercial probes such as a head coil and a body coil. In terms of the internal imaging, the anti-solenoid probes, constructed in the present study, was performed better than the conventional commercial probes. Also, RF(radio-frequency)-field maps produced by the anti-solenoid probes have been simulated using computers. The possibility of human internal imaging using the anti-solenoid probes has been discussed as well.

• The Transactions of the Korean Institute of Power Electronics
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• v.2 no.1
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• pp.26-32
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• 1997

In this paper, numerical analysis of dynamic characteristics for the plunger-type solenoid was used for a high speed solenoid valve with fast switching is discussed. The theoretic analysis of the electromagnetic field including eddy currents in the solenoid is studied by using permeance. The optimum value of design parameters which are a mass and an area of the plunger, a source voltage, a elastic modulus of the spring, a stroke, a number of turns, are obtained by the results of the investigation on effect of a parameter on others. And dynamic characteristics of acting solenoid that is the variation of magnetic force, displacement, solenoid current are investigated.

• Journal of the Korean Society for Precision Engineering
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• v.33 no.5
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• pp.341-348
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• 2016

The solenoid valve is used widely across various industries; however, solenoid valves for use in high-temperature environments have to be highly specified, such as those used in thermal power plants and steel mills. As such, we have developed a solenoid valve, using an already developed solenoid, to allow for more specific use. In this type of development method, use of 3D printing is very effective, allowing for a reduction in errors in design and production. This study includes a mathematical model of the solenoid valve. Then, the simulation from the mathematical model was performed using the AMESim (Advanced Modeling Environment for Simulation of Engineering Systems). We made a prototype valve using the simulation results and also measured the flow rate and dynamic performance.

• Transactions of The Korea Fluid Power Systems Society
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• v.3 no.4
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• pp.21-28
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• 2006

The proportional control solenoid valves as well as the PWM solenoid valves operated by electric signal play an important role in the hydraulic system for automatic transmissions to improve the shift quality. However it is not generally available for the performance data because most of the automotive parts manufacturer don't release the specific test results, especially dynamic performance that is essential to design a shift control algorithm. In this research, a performance test equipment that can be applied to various types of pressure control solenoid valve was developed. It was implemented by 8-bit micro-controller with many useful functions such as adjustable PWM carrier frequency, embedded function generator, current controller, data monitoring and acquisitions, etc. for the test of dynamic performance of solenoid valve as well as the steady-state pressure characteristics. The performance test results for the direct type proportional control solenoid valve show not only the validity of overall functions but also its usefulness as a hydraulic valve tester.

• Progress in Superconductivity and Cryogenics
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• v.9 no.1
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• pp.43-46
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• 2007

Solenoid coil is one of the commonly used one in superconducting power machines because it can produce uniform magnetic field at the center of the coil. Most of the AC loss in a solenoid coil is magnetization loss which is generated by the perpendicular magnetic field. This paper compares the electrical characteristics of two solenoid coils made of YBCO wire and BSCCO wire. We made and tested the BSCCO solenoid coil and YBCO solenoid coil which had the same number of turns and inner diameter. Number of turns and inner diameter of both coils were 30 turns and 10cm, respectively. AC loss of both coils were calculated by using the finite element method. Result shows that AC loss of YBCO coil was about 1/7 of that of the BSCCO coil when the current was 40A.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04b
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• pp.283-288
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• 1995

Dynamic model of 3-way PWM high speed solenoid valve was derived considering reluctance and inductance of electromagnet through valve spool by Bondgraph modeling method. Computer simulations of hydraulic system with 3-wayhigh speed solenoid valve were performed and the results were compared to te experimental results in order to validate the PWM valve dynamic model obtained.

• The Pure and Applied Mathematics
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• v.18 no.2
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• pp.141-155
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• 2011

We compute zeta functions of 1-solenoids. When our 1-solenoid is nonorientable, we compute Artin-Mazur zeta function and Lefschetz zeta function of the 1-solenoid and its orientable double cover explicitly in terms of adjacency matrices and branch points. And we show that Artin-Mazur zeta function of orientable double cover is a rational function and a quotient of Artin-Mazur zeta function and Lefschetz zeta function of the 1-solenoid.

• Proceedings of the KSME Conference
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• 2007.05b
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• pp.3056-3061
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• 2007

The technology of AC solenoid valves is now considered as a core technology in the fields of the production line of semi-conductor chips and the micro fluid chips for medical applications. And AC solenoid valves, which operate by compressed air, are characterized by high speed response, great repeatability and that the pressure on the cross sectional area of poppet is kept constant regardless of the fluctuation of the pressure exerted on the ports. In this study, AC solenoid valves that posses the high-speed responsibility and the high rate of flow have designed and analyzed through the law of equivalent magnetic circuit and Finite Element Method (FEM) respectively. In case of poppet, Flow field characteristic was analyzed by the variation of poppet and it was able to display flow field by changing the location of the poppet. Also, we verified possibility of the design through the static and dynamic pressure and the 3D distribution curve of the force by working the front poppet.

• Proceedings of the KSME Conference
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• 2001.06d
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• pp.927-932
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• 2001

It is intended to develope an algorithm for dynamic simulation of fast-acting solenoid valves. The coupled equations of the electric, magnetic, and mechanical systems should be solved simultaneously in a transient nonlinear manner. The transient nonlinear electromagnetic field is analyzed by the Finite Element Method (FEM), which is coupled with nonlinear electronic circuitry. The dynamic movement of the solenoid valve is analyzed at every time step from the force balances acting on the plunger, which include the electromagnetic force calculated from the Finite Element analysis as well as the elastic force by a spring and the hydrodynamic pressure force along the flow passage. Dynamic responses of the solenoid valves predicted by this algorithm agree well with the experimental results including bouncing effects.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2002.02a
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• pp.310-311
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• 2002

We designed a large bore superconducting solenoid as a source of magnetic field inside liquid-nitrogen-jacketed liquid helium dewar. The diameter of the sample space in the dewar is about 10.0 cm. Considering the space for thermal insulation between liquid helium and the sample tube, the solenoid bobbin has been designed to be 12.0 cm and the most inner layer of the solenoid 13.0 cm. The desired uniformity of the field, which is ~ $\pm$0.1％ of the central field amplitude deviation within ~5.0$^2$$\times$3.6 ㎤ with the shortest dimension along the solenoidal axis, restricted the length of the solenoid to be at least 41.14 cm.