The design of subminiaturized natural fragment warhead is based on the analysis of its effectiveness against target personnel. Toward this end, the personnel incapacitation probability suggested by Sperrazza and Kokinakis was used. The effectiveness of various natural fragment warhead designs was analyzed by altering the fragment mass, velocity, number, and the target distance. A preliminary optimal design value of the natural fragment warhead in a subminiaturized missile was suggested, which was greater than the threshold value of the fragment mass to cope with air resistance. We also determined that the appropriate fragment mass was about 2.1204 × 10-4 kg (3.3 grain) in case of a subminiature warhead. This work facilitates the development of final optimal design stage of the natural fragment warhead in a subminiaturized missile and can also be utilized for the analysis and design of different types of fragment warhead.
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Analysis Method based on Probability Equation and Analysis Method based on Test in order to Estimate the Target Incapacitation Distance of Fragmentation Warhead Joo Hyun Baek, Young Hwan Jo, Byung Uk Lee, Gu Hyun Ryu Journal of the Korean Society for Precision Engineering.2020; 37(10): 751. CrossRef
Determination Method of Main Warhead Detonation Delay Time based on the Analysis about the Protection Capability of Target and the Scattering Behavior of Explosive Reactive Armor Joo Hyun Baek, Se Lin Yu, Geun Jong Jeon, Won Young Lee, Young Hwan Jo, Byung Uk Lee Journal of the Korean Society for Precision Engineering.2019; 36(10): 937. CrossRef
A self-compensated water-hydrostatic bearing is well known to have advantages in stiffness. In this paper, its concept is extended to a hydrostatic journal bearing for achieving higher stiffness. The finite element method is applied to analyze the load characteristics of the self-compensated hydrostatic journal bearing. The analysis results reveal that the self-compensated journal bearing has higher load capacity and higher stiffness than conventional, fixed capillary journal bearings, and that this benefit degrades in the case of high eccentricity. Thus, a spindle system with self-compensated journal bearings must be designed to ensure a sufficiently large load capacity. A rectangular type capillary is also introduced with consideration of the practical application of the self-compensated hydrostatic journal bearing. Theoretical analysis results show that the rectangular type capillary is more beneficial than conventional annular type capillaries in practical use. The experimental verification on the analysis method is made to show that the experimental results are in good agreement with theoretical results.
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