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Influence of jet thrust on penetrator penetration when studying the structure of space object blanket
Engineering Education # 02, February 2014
DOI: 10.7463/0214.0699035
The paper presents calculations to determine a penetration depth into low-strength soil targets provided by penetrators equipped with the pulse jet engine when studying a structure of space object blanket. In movement the penetrator is considered as a rigid body of variable mass, which is subjected to the drag force and the reactive one applied at the moment the jet engine fires. Dynamics of moving penetrator with its conic nose part is described with binomial empirical law of target drag force and with assumption that the jet thrust force is constant during its application time. It is established that penetration depth into low-strength soil target can be several times increased owing to use of the jet engine. A rational time for the jet engine firing and operation is defined.
Magnetic pulsing compression of high-speed metal elements created by an explosion in free flight
Engineering Education # 12, December 2012
DOI: 10.7463/1212.0496555
Accumulation of micro-damages as a result of intensive plastic deformation leads to decrease in average density of the high-speed elements which are created by an explosive crimping of shaped metal cladding. In order to compress such elements while testing meteorite shield withstandability it is proposed to use the longitudinal magnetic field effect on these elements; the magnetic filed is produced on the mechanical trajectory of elements before their interaction with the target. An installation scheme was developed for implementation of magnetic pulsing compression of high-speed metal elements created by an explosion. Influence of the solenoid’s length and intensity of magnetic field on the effect of compression of steel and aluminum elements is determined on the basis of numerical simulation. It was established that the induction of the influencing magnetic field should be equal approximately to 50 T for steel elements, and about 30 T for aluminum elements.
Application of accelerometry for research of dynamic mechanical properties of materials in complicated environments of measuring
Engineering Education # 08, August 2012
DOI: 10.7463/0812.0428828
The authors carried out experimental studies aimed at development of variants of systems of continuous electric communication with the accelerometer under the conditions of application of terminal ballistics accelerometry (TBA-technology) to impact of a rigid body at an angle to the surface of the medium under test. A particular case of TBA-technology was tested under laboratory conditions for the case of inclined impact of soil medium along with defending screens. The algorithm of retrieving data on dynamic mechanical properties of soil medium using registrations of deceleration history of a rigid projectile during the penetration process into the medium under test was debugged. The developed technology is suitable for obtaining data on dynamic mechanical properties of soil medium in the range of sub-sound impact velocities.
Hardware implementation of Berlekamp-Massey key equation solver for Reed-Solomon codes in FPGA
Engineering Education # 07, July 2011
A review of different aproaches for decoding Reed-Solomon codes in terms of hardware cost and performance is given. We have developed a modified version of the key equation solver for Reed-Solomon decoder based on the Berlekamp-Massey algorithm. A distinctive feature of the proposed implementation is the combination of size and speed, which places it between existing implementations based on Berlekamp-Massey and Euclid algorithms.
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