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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Institute of Military Science and Technology
Journal Basic Information
Journal DOI :
The Korea Institute of Military Science and Technology
Editor in Chief :
Volume & Issues
Volume 6, Issue 4 - Dec 2003
Volume 6, Issue 3 - Sep 2003
Volume 6, Issue 2 - Jul 2003
Volume 6, Issue 1 - May 2003
Selecting the target year
The Effect of Stabilizer(DPA,
) Addition on the Shelf Life of the Single Base Propellant
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 9~19
Nitrogen oxide gases which were produced by spontaneous reaction of nitrocellulose(NC) in the single base propellant accelerate the decomposition of propellant, and result in the reduction of shelf life. The amount of nitrogen oxide was reduced by the addition of 0.3wt%
to conventional stabilizer(DPA) and down of the solvent leaching temperature from
, which extended the shelf life of the single base propellant as much as twice compare with commercial propellant. The perforation diameter increase of propellant from 0.64mm to 0.77mm could compensate for the drop of burning rate which was caused the addition of
Analysis of Underwater Acoustic Radiation of SWATH vessel using Transfer Function Method
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 20~34
The good sea-keeping capability of the SWATH(Small Waterplane Area Twin Hull) ship has been attractive for research or surveillance vessels. Especially, for the naval ships accomplishing the underwater acoustic missions, it is necessary to access and minimize the underwater radiated noise level generated by the ships. Therefore, acoustic signature management and control are very important topics for these vessels. Underwater radiation pattern in the low frequency range is dominated by the tonals from the vibration of onboard machinery. In this work, the radiated noise level generated by the propulsion machine in the submerged hull is predicted using the transfer function technique and the hull transfer function for the submerged hull is determined by analyzing the longitudinal/circumferential stiffened infinitely long cylindrical shell and considering the empirical database of the previous vessels. It is confirmed that the transfer function technique can give useful information for identifying the noise source and estimating its contribution to the total radiatied noise level.
The Development of Decal Panel for Night Vision Imaging System of Aircraft
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 35~44
A Decal Panel is developed for the Night Vision Imaging System of XKO-1 aircraft. The Decal Panel is a kind of lighting system kits and is installed on each system switch box in crewstation. The Decal Panel consists of upper panel made of polycarbonate and lower panel which is a printed circuit board. This paper includes the design, manufacture, test and evaluation of Decal Panel in addition to items and conditions of environmental test. Besides it is confirmed the Key for manufacturing a decal panel, is depth of paint, dry time period and frequency, and diffusion material for spreading of light.
Study on the Operational Concept of Underwater Acoustic Measurement System in Korean Sea
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 45~54
The radiated-noise of combat ship is very important in the point of detection and vulnerability assessment. Therefore several kind of underwater acoustic measurement method has been developed. This paper reviews the various measurement concepts and proposes a procedure to select the better one under consideration of measurement conditions. And this paper recommends the portable drift type, which has vertical line array, as the most efficient measurement method in Korean sea.
A Measurement and Analysis of Low Level Radiated-Noise Using Vertical Line Array
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 55~64
Underwater acoustic noise measurement is an essential element for vulnerability assessment of modern naval platforms. But during the last few decades environmental conditions have drastically changed due to the gradually increasing sea ambient noise level and decreasing submarine radiated noise level. A real-time underwater acoustic measurement system with vertical line array is designed for the quiet submarine radiated noise assessment in challenging environment. This system has a constant directivity index in measurement frequency range and accurate tracking capability for the transmission loss compensation and navigation aids inside the submarine. This system has been validated at sea and used several times for the submarine noise measurement.
A 3-D Structural Analysis of Composite Sabot
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 65~72
Composite sabot can increase the penetration performance of APFSDS projectile by reduction of the sabot weight. However, it has a thick-sectioned lamination and the lamination structure is different from those of the conventional composite parts. In this study, modeling technique for a thick and radially-laminated composite part has been applied in the finite element analysis of composite sabot. Four models of composite lamination for the sabot have been proposed and evaluated for their structural strength.
A Free-Space Method for Measurement and Analysis of Dielectric Characteristics of Electromagnetic Absorbing Materials at Microwave Frequencies
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 73~82
For measurements and analysis of dielectric characteristics of planar slabs of microwave absorbing materials, I have applied a free-space method in the frequency range of 8~14 GHz. The measurement system for free-space method consists of transmit and receive antennas, mode transitions, precision coaxal cables, the network analyzer, and a computer Special Spot-focused horn lens antenna was used to eliminate diffraction effects. Diffraction effects at the edges of the sample are minimized by satisfying the condition for minimum transverse dimension of the plate and the beamwidth of the antennas at the focus. The time-domain gating feature of the network analyzer and the thru, reflect, and line(TRL) calibration technique were used to eliminate the effects of undesirable multiple reflections. The complex coefficients of reflection and transmission,
, of planar samples were measured for standard materials such as Teflon, Rexolite
2200. The results were compared with existing measurement method. And I applied a free-space method for measurement to measure dielectric constants of some electromagnetic absorbing materials. Dielectric properties for the same samples were also measured with a 7mm coxial transmission line method for purposes of comparison with the free-space method.
Preliminary Aerodynamic Design of 13:1 Pressure Ratio Axial-Centrifugal Compressor
Journal of the Korea Institute of Military Science and Technology, volume 6, issue 2, 2003, Pages 83~94
Preliminary aerodynamic design of a compressor is carried out to meet the design requirements which are pressure ratio of 13, air mass flow rate of 4 ㎏/s and rotational speed of 45,000 rpm. The compressor type is chosen as an axial-centrifugal compressor from the design requirements which is suitable for a medium power class turboprop or turboshaft engine. Its overall isentropic efficiency is estimated to be 0.796 and its surge margin to be 20% exceeding the design requirement. This paper summarizes the aerodynamic design details including the design procedures and the results of the axial -centrifugal compressor.