http://arthra.ugal.ro/handle/20.500.14043/25982 2026-04-17T21:05:26Z 2026-04-17T21:05:26Z Bălan, Vasile Bordei, Marian http://arthra.ugal.ro/handle/20.500.14043/25998 2020-09-03T13:27:47Z 2014-01-01T00:00:00Z

Experiments on Ballistic Tests for Improving Performance of a Neutralizing Gas Dynamics System Bălan, Vasile; Bordei, Marian Neutralizing improvised explosive devices (handmade) by mechanical separation of the elements which are part of their composition can be achieved by the following methods: - generation of shock waves by means of the impact method between a projectile or a jet formed from diverse disrupting backgrounds and the improvised explosive device. It is known that after impact we must have at the interface projectile (jet)–target the same pressure and material speed; they characterize the equilibrium that is established at the interface; - generation of shock waves by detonating explosives placed in direct contact with parts subject to shock. This method is destructive and it must take into account the combined effects of explosive load that we want to neutralize and cargo of explosives used in neutralization; it can be used only in special places which can provide a range of effective safety; - generation of shock waves using lasers; at this stage, this method is only used in laboratories through fundamental research. The most used method for neutralization of an improvised explosive device is the first one. The neutralization systems (gas-dynamics systems) that propel the kinetic projectiles using explosives are used to transmit large shocks to various inert or reactive targets. These shocks have a significant impact on the targets, transmit changes in state and kinematic parameters, leading to either dismantling of targets or initiating explosive charges receivers. Initiating the explosive to the receiver detonation devices that can be parts of improvised explosive devices happens because the incident shock wave has exceeded the critical threshold of initiation. The initiation of detonation is, generally, an undesirable event, as explosive charge mass, although part of it, may not make it possible to take appropriate safety distances and thus material damage and human injury can be induced. Given the complexity of improvised explosive devices, the impossibility of knowing the exact explosive charges and the initiation ones in their composition, we cannot say that there existsa neutralizing thruster jet to meet all technical requirements specified above. In an attempt to simplify and systematize the study, we are going to present a summary classification of explosive jet engines means, capable of being used to neutralize improvised explosive devices. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 4 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z Bălan, Vasile Bordei, Marian http://arthra.ugal.ro/handle/20.500.14043/25997 2020-09-03T13:27:47Z 2014-01-01T00:00:00Z

Experiments on Ballistic Tests for Improving Performance of a Neutralizing Gas Dynamics System Bălan, Vasile; Bordei, Marian Neutralizing improvised explosive devices (handmade) by mechanical separation of the elements which are part of their composition can be achieved by the following methods: - generation of shock waves by means of the impact method between a projectile or a jet formed from diverse disrupting backgrounds and the improvised explosive device. It is known that after impact we must have at the interface projectile (jet)–target the same pressure and material speed; they characterize the equilibrium that is established at the interface; - generation of shock waves by detonating explosives placed in direct contact with parts subject to shock. This method is destructive and it must take into account the combined effects of explosive load that we want to neutralize and cargo of explosives used in neutralization; it can be used only in special places which can provide a range of effective safety; - generation of shock waves using lasers; at this stage, this method is only used in laboratories through fundamental research. The most used method for neutralization of an improvised explosive device is the first one. The neutralization systems (gas-dynamics systems) that propel the kinetic projectiles using explosives are used to transmit large shocks to various inert or reactive targets. These shocks have a significant impact on the targets, transmit changes in state and kinematic parameters, leading to either dismantling of targets or initiating explosive charges receivers. Initiating the explosive to the receiver detonation devices that can be parts of improvised explosive devices happens because the incident shock wave has exceeded the critical threshold of initiation. The initiation of detonation is, generally, an undesirable event, as explosive charge mass, although part of it, may not make it possible to take appropriate safety distances and thus material damage and human injury can be induced. Given the complexity of improvised explosive devices, the impossibility of knowing the exact explosive charges and the initiation ones in their composition, we cannot say that there existsa neutralizing thruster jet to meet all technical requirements specified above. In an attempt to simplify and systematize the study, we are going to present a summary classification of explosive jet engines means, capable of being used to neutralize improvised explosive devices. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 4 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z Cazacu, Nelu Lucaci, Cătălin Bogdan http://arthra.ugal.ro/handle/20.500.14043/25996 2020-09-03T13:27:47Z 2014-01-01T00:00:00Z

Funcţional Model of Savonius Type Vertical Axis Wind Turbine With Periodic Coupling of Adjacent Vertical Blades Cazacu, Nelu; Lucaci, Cătălin Bogdan The field of HAWT (Horizontal Axis Wind Turbines) regarding the use of wind energy (WE) as a renewable energy source (RES) is well researched and the results are covering both the power range and efficiency. Deficiencies observed during high wind speeds affect the investment costs. Savonius is a VAWT (Vertical Axis Wind Turbine) used for low wind speed, with low costs and low efficiency. The study proposes a conceptual model of Savonius type of VAWT (SWT) meant to increase the efficiency by reducing the resistance of the returning blade. SWT conceptual models were studied and analyzed and then a MC was elaborated and a MF and MM have been developed. An ME was made based on the MC and MF, which was used in wind tunnel experiments. The starting torque, the power factor, the efficiency, the speed and the output voltage of the generator were investigated. The results confirm the viability of the model and its resources to increase efficiency. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 4 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z Petrea, Ionel http://arthra.ugal.ro/handle/20.500.14043/25995 2020-09-03T13:27:47Z 2014-01-01T00:00:00Z

Analysis Frequencies of a Vibration-Type Structure Hall Petrea, Ionel Its main purpose was to identify natural vibration frequencies for a warehouse type structure in order to avoid resonance phenomena of the structure. The analysis is performed using the finite element analysis module of the CATIA system. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science No. 4 – 2014, ISSN 1453 – 083X

2014-01-01T00:00:00Z