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Field test on the effects of explosively generated plasma on aerial depth bombs PLAB- 250-120

Miszczak M., Warchoł R., Gędziorowski M., Piecuch M., Grzeczka G.

Polish Hyperbaric Research

2023

nr 3(84)

27--40

In order to gain access to the booster and main explosive charges of PLAB-250-120 aerial depth bombs, i.e. the TNT charge and the TGAF-5M explosive composition of TNT, hexogen (RDX), aluminum powder and phlegmatizing agent respectively, Explosively Generated Plasma (EGP) devices were used to perforate their steel bodies. EGP devices were made in two versions. The first used a cylindrical TNT charge, while the second used a cylindrical charge shaped from SEMTEX PW4 plastic explosive. The explosive charges were supported by waveguides with conical cavities tapering towards the bomb. The structural components of the EGP devices, i.e. the bodies housing the explosive charges and the waveguides, were made of plastic by 3D printing. The effects of the EGP on the bomb were studied depending on the explosive material used, its mass and the distance of the EGP device waveguide from the side surface of the bomb. Simultaneous firing of an array of two EGP devices inserted with SEMTEX PW4 explosive, contacted their waveguides with the bomb, resulted in its detonation, while simultaneous firing of the analogous array of the same type two EGP devices inserted with SEMTEX PW4 explosive, with their waveguides at a distance of 10 mm from the bomb, resulted in perforation of two circular through-holes in the bomb body. Firing single EGP device inserted with TNT, being in contact through its waveguide with the body of the bomb, resulted in local rupture of the bomb body with crushing the bomb explosive charges, so allowing easy access to bomb explosive charges and sampling them.

Fundamenty palowe z sondowaniem CPT pod podstawą pala

Trojnar Krzysztof, Siry Aleksander, Puch Filip

Mosty

2021

nr 3

26--30

W artykule przedstawiono przykłady wykonania fundamentów palowych z użyciem innowacyjnej głowicy EGP. Wyposażenie wiertnicy palowej w specjalne czujniki oraz sondę CPT umieszczoną wewnątrz świdra przemieszczeniowego umożliwia prowadzenie pomiarów bezpośrednich w czasie robót palowych. Stosowanie technologii EGP ma zdecydowanie korzystny wpływ na jakość robót fundamentowych. Pozwala redukować koszt wykonania pali przy jednoczesnym zapewnieniu bezpieczeństwa posadowienia.

The article presents examples of pile foundations with the use of the innovative EGP technology. The pile drilling rig with special sensors and the CPT probe placed inside the displacement auger enables direct measurements during piling works. The use of the EGP technology has a definitely beneficial effect on the quality of foundation works. It allows to reduce the cost of making piles while ensuring the safety of the foundation. The experience gathered so far from the Podkarpackie Region is of particular importance for the foundation of bridge supports on piles in situations where there are relatively thin layers of load-bearing soil in the ground or when there are justified doubts as to the condition of the ground under the foundations of already completed piles. In such cases, the use of EGP technology can help the piling operator make better decisions during the execution of individual piles on site.

Spectral analysis of Borowiec SLR data for spin determination of geodetic satellite EGP

Kucharski D., Schillak S., Lim H. C., Otsubo T.

Artificial Satellites : Journal of Planetary Geodesy

2013

Vol. 48, No. 1

15--23

Borowiec 10 Hz Satellite Laser Ranging (SLR) station is capable to measure spin of the Japanese Experimental Geodetic Satellite (EGP). Spectral analysis of 391 passes measured from March 10, 1994 to November 27, 2009 gives frequency signal representing the 3rd and the 6th harmonics of the satellite spin rate. Analysis of this signal, corrected for the apparent effects, indicates en exponential slowing down of the satellite: the spin rate decreases according to the equation f = 671.115907 exp(-4.08324 x 10-5 D) [mHz], where D is a day after launch. More than 15 years of the SLR measurements allowed investigating the initial spin rate of the satellite fini = 671.116, RMS = 0.203 [mHz] (initial spin period Tini = 1.49006, RMS = 0.0007 [s]).