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OPTIMEX: Measurement of Detonation Velocity with a Passive Optical Fibre System

Pachmáň J., Künzel M., Kubát K., Šelešovský J., Maršálek R., Pospíšil M., Kubíček M., Prokeš A.

Central European Journal of Energetic Materials

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2017

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Vol. 14, no. 1

233--250

EN

Detonation velocity (VOD) is one of the most important parameters describing the detonation process of a particular explosive. This article summarizes some peculiarities that we have come across when building and testing our new passive optical VOD meter – OPTIMEX. The advantages of using multiple probes with independent signal recording is discussed. The practical issues related to an explosive’s translucency are solved. Finally, a new method for detonation velocity data evaluation is proposed and demonstrated.

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OPTIMEX: Measurement of Detonation Front Curvature with a Passive Fiber Optical System

Pachman J., Künzel M., Kubát K., Selesovsky J., Maršálek R., Pospíšil M., Kubíček M., Prokeš A.

Central European Journal of Energetic Materials

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2016

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Vol. 13, no. 4

807--820

EN

The ability of a newly developed independent passive optical system OPTIMEX to measure the detonation front curvature is demonstrated on charges of pressed explosive A-IX-1 (RDX/ceresin-stearin mixture with 95/5 wt.%). The charges, with length to diameter ratios of from one to four, were prepared from cylinders with diameters of 21 mm, 30 mm, 40 mm and 50 mm pressed to a density of 1.66 g/cm3. Such charges detonate with a velocity of 8220 m/s. The detonation curvature was obtained using 8 optical fibers and the results were compared with photographs acquired by an ultra-high speed framing camera UHSi 12/24.

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State-space control of the drive with PMSM and flexible coupling

Vittek J., Makyš P., Pospíšil M., Szychta E., Luft M.

Logistyka

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2010

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nr 6

EN

A control system, which achieves prescribed speed and position responses, for electric drives with a significant torsion vibration mode is presented. Control system design exploits state-space control and forced dynamics control principles. Derived control algorithm respects the vector control condition by keeping the direct axis current component approximately zero as well as controlling the load position with prescribed closed loop dynamics. Set of two observers, one on load side and the second one on motor side, generate all state variables necessary for control algorithm design including torques acting on the motor and load side to satisfy all conditions for achieving prescribed dynamics. This approach allowed to eliminate position sensor on motor side. The simulations confirm that proposed model based position control system can operate with moderate accuracy.

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Forced dynamics speed control of the drive with linear PMSM

Vavrúš V., Pospíšil M., Szychta E., Luft M.

Logistyka

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2009

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nr 6

CD-CD

EN

Forced dynamics control of the drive with linear permanent magnet synchronous motor is presented and verified. This, a relatively new control method offers an accurate realisation of a dynamic speed response with prescribed acceleration, which can be selected for given transport application by the user. In addition to this, vector control condition, which requires right angle between the stator current vector and moving part flux vector, is maintained as it is in conventional drives. To achieve prescribed speed response of moving part, the derived control law requires estimation of an external force, which is obtained from the set of two observers. The observer of moving part speed, which works in pseudo-sliding mode, is completed with the second one, having filtering effect to eliminate chattering of the previous one. The proposed control algorithms with precisely defined acceleration, one of which is suitable for traction application, are verified by simulations and experimentally. Preliminary experiments confirmed that the moving part speed response is capable to follow prescribed smooth acceleration fairly closely.

PL

W artykule jest prezentowany i weryfikowany układ sterowania dynamicznego napędu z liniowym synchronicznym silnikiem z magnesami trwałymi. Ta stosunkowo nowa metoda sterowania powoduje dokładną realizację dynamicznie zadanej prędkości z zadanym może być wybrana przez użytkownika dla danego zastosowania w transporcie. Warunek sterowania wektorowego, który wymaga prawidłowego kąta pomiędzy wektorem prądu stojana a wektorem strumienia części ruchomej jest utrzymany, jak w tradycyjnych napędach. Aby osiągnąć zadaną odpowiedź prędkości części ruchomej, przedstawione prawo sterowania wymaga estymacji zewnętrznego wymuszenia otrzymywanego poprzez układ dwóch obserwatorów. Obserwator prędkości części ruchomej, który pracuje w trybie 'pseudosliding' jest uzupełniony przez drugi, mający właściwość filtracji eliminującej zakłócenia wprowadzane przez pierwszy obserwator. Proponowane algorytmy sterowania z dokładnie zdefiniowanym przyśpieszeniem, mogą być użyteczne w zastosowaniach trakcyjnych. Są one zweryfikowane poprzez badania symulacyjne i eksperymentalne. Wstępne wyniki badań eksperymentalnych potwierdziły, że odpowiedź części ruchomej jest zdolna dość dokładnie nadążyć za przyśpieszeniem.