Analytical study of magnetohydrodynamic propulsion stability

Jamalabadi, Mohammad Yaghoub Abdollahzadeh

doi:10.1007/s11804-014-1258-6

Cited by 15 publications

(4 citation statements)

References 42 publications

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“…The maximum flatness of the frequency response curve within the passband is a property of the Butterworth filter, with the passband unchanged and the stopband slowly decreasing to zero. As the angular frequency increases, the amplitude gradually decreases from a specific boundary angular frequency and tends to negative infinity on a log-Bode plot of amplitude and angular frequency [1]. This feature makes it suitable for applications that prioritize smooth frequency response over sharp drop characteristics.…”

Section: Introductionmentioning

confidence: 99%

Chebyshev filter and Butterworth filters: Comparison and applications in different cases

2024

ACE

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This study focuses on the filter selection problem in signal processing and wireless communication applications. Specifically, addressed two different filter selection problems: the Chebyshev filter and the Butterworth filter. Using MATLAB, in order to design and model these two types of filters. The performance, frequency response, transition band width, filter order, design complexity and target application of Chebyshev filter and Butterworth filter under different parameters are analyzed and compared. The selection of the two filters under different conditions and the reasons for choosing them are discussed. The Chebyshev filter is suited for applications that call for a high frequency response, and Chebyshev filters provide a steeper roll-down slope, which can suppress high-frequency noise and interference signals, according to the test results, it is widely used in communication systems. On the other hand, the Butterworth filter is more suitable for applications that require a flat passband and a wide stopband, such as audio systems.

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Section: Introductionmentioning

confidence: 99%

Chebyshev filter and Butterworth filters: Comparison and applications in different cases

2024

ACE

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“…The effects of MHD channel shapes were evaluated numerically by Doss et al (1990) and evaluated analytically and experimentally by Gilbert et al (1995). Other research subjects in this field include the improvement of water conductivity (Lin, 1990 andLin et al 1991), superconductors and cooling systems (Hales et al 2006;Yan et al 2002;Meng et al 1991) and the stability of MHD systems (Abdollahzadeh, 2014). For a comprehensive overview of studies in this area, one may refer to the work of Weier et al (2007).…”

Section: Introductionmentioning

confidence: 99%

Preliminary Experimental Investigation on a Low Profile Magneto-Hydrodynamic Propulsive Blanket, Considering Plasma Generation

Chekab

Ghadimi

Sheikholeslami

et al. 2018

JAFM

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The use of magnetohydrodynamic (MHD) blanket propulsion system in ships, even with low efficiencies, has particular benefits that can make them an appropriate option for the marine designers. Accordingly, any attempt to increase the efficiency of these systems requires full recognition of their performance in different conditions. In the present study, as a continuation of previous numerical works by the current authors, a magneto-hydrodynamic blanket propulsion system has been built and experimentally studied through examining the MHD forces produced in different voltages. Copper and gold have been used and compared as electrodes and the high advantage of gold has been demonstrated. The effect of electrolysis on the behavior of the blanket is analyzed. It has been demonstrated that although electrolysis restricts high currents in lower voltages (lower than ~140V) and the saturation of hydrogen decreases the MHD forces due to low electrical current (~140V up to ~160V), the saturation of hydrogen around cathode at high voltages (more than ~160V), makes a dielectric barrier which soon breaks down and make the production of plasma possible, which in turn highly increases the thrust force of the MHD blanket. Therefore, three regimes have been introduced and described for the MHD blanket; the electrolysis regime, the transition regime, and the hot plasma regime. Based on the obtained results, one may conclude that the present results have offered good evidence about the possibility of increasing the MHD blanket performance through plasma production in water.

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“…The effects of magneto-hydrodynamic channel shapes were analytically and experimentally assessed by Gilbert et al (1995) and numerically analyzed by Doss et al (1990). Abdollahzadeh (2014) also studied the stability issues of the magneto-hydrodynamic propulsion systems.…”

Section: Introductionmentioning

confidence: 99%

Curvature Effects on the Electromagnetic Force, Efficiency, and Heat Transfer of a Weak Low Profile Magneto-Hydrodynamic Blanket Propulsion System

Chekab

Ghadimi

2017

JAFM

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The present study concerns the numerical assessment of the effects of longitudinal and lateral curvature of a flexible low profile magneto-hydrodynamic blanket on its thrust, performance, and heat transfer. To this end, after validating the solver with the analytical solution of the Hartman problem, negative and positive curvatures are taken into consideration in lateral and longitudinal directions on the blanket and electromagnetic and velocity fields, temperature distributions, force density fields and profiles are extracted and compared to the flat MHD blanket. It is demonstrated that negative curvatures increase the thrust force and temperature of the blanket and the reverse occurs for the positive curvatures. It is also shown that the longitudinal curvature affects the blanket thrust by -2.5% up to 5.2%, its efficiency by nearly 6% and the temperature change from -25 up to 28%. On the other hand, for the lateral curvatures, the overall thrust produced by the blanket is affected by about -6% to +6%, the efficiency is affected by -10% to 25% and temperature change is affected by -2 to 6%.

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Analytical study of magnetohydrodynamic propulsion stability

Cited by 15 publications

References 42 publications

Chebyshev filter and Butterworth filters: Comparison and applications in different cases

Chebyshev filter and Butterworth filters: Comparison and applications in different cases

Preliminary Experimental Investigation on a Low Profile Magneto-Hydrodynamic Propulsive Blanket, Considering Plasma Generation

Curvature Effects on the Electromagnetic Force, Efficiency, and Heat Transfer of a Weak Low Profile Magneto-Hydrodynamic Blanket Propulsion System

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