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Probe signal processing for channel estimation in underwater acoustic communication system
PublikacjaUnderwater acoustic communication channels are characterized by a large variety of propagation conditions. Designing a reliable communication system requires knowledge of the transmission parameters of the channel, namely multipath delay spread, Doppler spread, coherence time, and coherence bandwidth. However, the possibilities of its estimation in a realtime underwater communication system are limited, mainly due to the computational...
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Notch fatigue analysis and life assessment using an energy field intensity approach in 7050-T6 aluminium alloy under bending-torsion loading
PublikacjaThis paper studies the fatigue crack initiation and fatigue crack propagation of notched cylindrical bars made of 7050-T6 aluminium alloy subjected to multiaxial bending-torsion loading. The sites of crack initiation and the angles of crack initiation were successfully predicted from the distribution of the first principal stress at the notch surface. Fatigue crack initiation lives were computed through the new concept of energy...
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Considerations of Adaptive Digital Communications in Underwater Acoustic Channel
PublikacjaDown-link communication (DLC) and air transportable communication (ATAC) buoys as well as autonomous underwater vehicles (AUV) use acoustic links for gathering oceanographic data from underwater monitoring systems. The underwater channel propagation conditions are diverse in nature and require a special adaptive approach to the communication system design. The article presents a methodology for the communication systems design,...
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Damage-involved response of two colliding buildings under non-uniform earthquake loading
PublikacjaPounding between insufficiently separated buildings, which may result in considerable damage or may even lead to the total collapse of colliding structures, has been repeatedly observed during earthquakes. Earthquake-induced collisions of buildings has been intensively studied applying various structural models. It was assumed in the analyses, however, that the seismic excitation is identical for all structural supports; whereas,...
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Analysis of Methods for Determining Shallow Waterbody Depths Based on Images Taken by Unmanned Aerial Vehicles
PublikacjaHydrographic surveys enable the acquisition and processing of bathymetric data, which after being plotted onto nautical charts, can help to ensure safety of navigation, monitor changes in the coastal zone, and assess hydro-engineering structure conditions. This study involves the measurement of waterbody depth, identification of the seabed shape and geomorphology, the coastline course, and the location of underwater obstacles....
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Response of cylindrical steel tank under stochastically generated non-uniform earthquake excitation
PublikacjaCylindrical steel tanks are very important structures in industrial facilities since their application is related to storing different types of products. Their safety and reliability have become a crucial issue because any damage may cause significant consequences, including ecological disaster. The most dangerous dynamic load acting on cylindrical steel tanks is related to earthquakes, especially that the seismic excitation may...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.4, b=0.26) and (C=6.2, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.0, b=0.11) and (C=7.3, b=0.49) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.4, b=0.26) and (C=7.3, b=0.49) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.4, b=0.26) and (C=3.3, b=0.40) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.0, b=0.11) and (C=6.4, b=0.45) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.5, b=0.37) and (C=7.3, b=0.49) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.0, b=0.11) and (C=3.3, b=0.40) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.5, b=0.37) and (C=6.2, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.0, b=0.11) and (C=6.2, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.5, b=0.37) and (C=3.3, b=0.40) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.5, b=0.37) and (C=6.4, b=0.45) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.4, b=0.26) and (C=6.4, b=0.45) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.80, b=0.25) and (C=3.30, b=0.40) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.80, b=0.25) and (C=6.20, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.8, b=0.25) and (C=5.3, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.10, b=0.14) and (C=7.30, b=0.49) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.1, b=0.14) and (C=4.4, b=0.42) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.10, b=0.14) and (C=6.20, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.70, b=0.32) and (C=3.30, b=0.40) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.10, b=0.14) and (C=3.30, b=0.40) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.70, b=0.32) and (C=6.20, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.4, b=0.26) and (C=4.4, b=0.42) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.80, b=0.25) and (C=6.40, b=0.45) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.4, b=0.26) and (C=5.3, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.7, b=0.32) and (C=4.4, b=0.42) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.1, b=0.14) and (C=5.3, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.0, b=0.11) and (C=4.4, b=0.42) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.7, b=0.32) and (C=5.3, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.0, b=0.11) and (C=5.3, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.70, b=0.32) and (C=7.30, b=0.49) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.5, b=0.37) and (C=4.4, b=0.42) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.70, b=0.32) and (C=6.40, b=0.45) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.8, b=0.25) and (C=4.4, b=0.42) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.80, b=0.25) and (C=7.30, b=0.49) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=5.5, b=0.37) and (C=5.3, b=0.38) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Determination of flow properties of a serial connection of two pneumatic elements with (C=2.10, b=0.14) and (C=6.40, b=0.45) from changes in air pressure in a tank being emptied
Dane BadawczeThe aim of the study was to determine the flow properties of serial connection of pneumatic components.The experiments were to measure the pressure changes in a being emptied tank for a directional control valve and a pressure relief valve arranged in-line. Four test configurations were used: (1) being emptied tank -> DCV -> ambient atmosphere,...
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Przekształtnik prądu jako sterownik w układach napędowych z silnikami indukcyjnymi
PublikacjaThe circuits used for power conversion applied in drives with electric machines are classified into two groups: voltage source inverters (VSI) and current source inverters (CSI). Application of the current source inverter results in better properties of drive than application of voltage source inverter because there is no output filter. The development of power electronics and especially the IGBTs, in which on/off-times are very...
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Integrated Three-Level Dual-Phase Inverter
PublikacjaIn view of reducing the number of inverter legs that provide dual-phase, three-level output voltages (as may be needed in an uninterruptible power supply), and that also provide a wide range of output frequencies (as needed in an advanced motor drive system with wide speed ranges), a three-level, dual-phase inverter topology is presented in this paper. Its three-level attribute was based on the F-type inverter topological concept,...
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Evaluation of Mechanical Properties of Two-Stage Concrete and Conventional Concrete Using Nondestructive Tests
PublikacjaDifferent types of concrete mixtures are used as building materials. The manufacturing process of two-stage concrete (TSC) differs from that of conventional concrete. This study investigated conventional mechanical properties derive empirical relations for estimation of the mechanical parameters of TSC and conventional concrete mixtures. TSC was used to prepare 216 specimens and conventional concrete was used to prepare 108 specimens...
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The Conceptual Research over Low-Switching Modulation Strategy for Matrix Converters with the Coupled Reactors
PublikacjaIn this paper, different Pulse Width Modulation (PWM) strategies for operating with a low-switching frequency, a topology that combines Conventional Matrix Converters (CMCs), and Coupled Reactors (CRs) are presented and discussed. The principles of the proposed strategies are first discussed by a conceptual analysis and later validated by simulation. The paper shows how the combination of CMCs and CRs could be of special interest...
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Direct modulation for conventional matrix converters using analytical signals and barycentric coordinates
PublikacjaThis paper proposes the generalized direct modulation for Conventional Matrix Converters (CMC) using the concept of analytical signals and barycentric coordinates. The paper proposes a novel approach to the Pulse Width Modulation (PWM) duty cycle computing, which allows faster prototyping of direct control algorithms. The explanation of the new idea using analytical considerations demonstrating the principles of direct voltage...
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Influence of Surface Laser Treatment on Mechanical Properties and Residual Stresses of Titanium and its Alloys
PublikacjaSurface modification of the titanium and its alloys used in implantology with a long-pulse laser can change the surface topography, but it also leads to changes in the stress sign and magnitude in the resulting subsurface layer. The presented research was aimed at evaluating the state of stress after laser remelting with the Nd:YAG laser of pre-etched titanium alloys Ti6Al4V and Ti13Nb13Zr and pure titanium. The obtained surface...
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Stress Detection of Children with Autism using Physiological Signals in Kaspar Robot-Based Intervention Studies
PublikacjaThis study aims to develop a stress detection system using the blood volume pulse (BVP) signals of children with Autism Spectrum Disorder (ASD) during robot-based interven- tion. This study presents the heart rate variability (HRV) analysis method to detect the stress, where HRV features are extracted from raw BVP signals recorded from an E4 wristband during interaction studies with the social robot Kaspar. Low frequency power...
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Interaction of Acoustic and Thermal Modes in the Gas with Nonequilibrium Chemical Reactions: Possibilities of Acoustic Cooling
PublikacjaNonlinear generation of thermal mode during propagation of dominative sound in a chemically reacting gas is considered. The dynamic equation of excess temperature associated with the thermal mode is derived. It is instantaneous and includes quadratic nonlinear acoustic source reflecting the nonlinear character of interaction between acoustic and non-acoustic types of gas motion. Both periodic and aperiodic sound may be considered...