Effect of power on PPT discharge current

, Article Aircraft Engineering and Aerospace Technology ; Volume 85, Issue 3 , 2013 , Pages 207-214 ; 00022667 (ISSN) Rezaeiha, A ; Sharif University of Technology

2013

Abstract

Purpose - The purpose of this paper is to investigate the effect of power on pulsed plasma thruster (PPT) discharge current with respect to its peak, duration, and behavior while the power elevates in a low power range. Design/methodology/approach - A rectangular parallel-plate breech-fed PPT has been developed with a self-inductor coupling element connecting the PPT cathode to the ignitor plug cathode. The PPT has been operated in vacuum chamber at 10-6mbar and its discharge current has been recorded using a Rogowski coil while input power has been changed by means of varying the capacitor voltage at given capacitance and frequency. Findings - The analysis leads to elucidate the effects of...

Review of worldwide activities in liquid-fed pulsed plasma thruster

, Article Journal of Propulsion and Power ; Volume 30, Issue 2 , March-April , 2014 , Pages 253-264 ; ISSN: 07484658 Rezaeiha, A ; Schonherr, T ; Sharif University of Technology

2014

Abstract

A review of worldwide activities in liquid-fed pulsed plasma thruster (LPPT) is discussed. Pulsed plasma thruster are extensively recognized as one of the most promising electric space propulsion systems to perform propulsive tasks on micro- and nanosatellites, including cubesats, because they offer many advantages compared with other electric space propulsion systems. The low plasma exhaust velocity measured by a Langmuir probe showed that thrust is mainly produced by 0.3 μg mass ionized by the first trigger and a much greater quantity of propellant introduced by the main discharge remained neutral at low speed. Various propellant feeding and discharge initiation methods have been applied...

Analysis of effective parameters on ablative PPT performance

, Article Aircraft Engineering and Aerospace Technology ; Volume 84, Issue 4 , 2012 , Pages 231-243 ; 00022667 (ISSN) Rezaeiha, A ; Schönherr, T ; Sharif University of Technology

2012

Abstract

Purpose - The purpose of this paper is to comprehensively review most of the significant works ever done worldwide to study the effects of essential parameters on pulsed plasma thruster (PPT) performance and to analyze the effects of each parameter on PPT performance. Design/methodology/approach - All the important works studying PPT performance are categorized by the parameter they have studied and its effect on the thruster performance, and their works have been reviewed to analyze the influence of each parameter. Findings - The analysis leads to elucidation of the effects of different geometrical parameters including aspect ratio, electrode width, electrode spacing, electrode shape,...

Design and Development a Prototype Pulsed Plasma Thruster (PPT)

, M.Sc. Thesis Sharif University of Technology Rezaeiha, Abdolrahim (Author) ; Farshchi, Mohammad (Supervisor)

Abstract

Although Pulsed Plasma Thruster (PPT) has first been utilized in a space mission in 1964 but after more than four decades, it is still a space rated technology which has performed various propulsion tasks from stationkeeping tasks to three-axis attitude control for a variety of former missions. With respect to the rapid growth in the small satellite community and the growing interest for smaller satellites in recent years, PPT is one of the promising electric propulsion devices for small satellites (e.g. CubeSats) as the following advantages: simplicity, lightweight, robustness, low power consumptions, low production costs and small dimensions. In spite of the fact that the issues relating...

Levels of Selection and Multi-Level Selection in Special Examples of Biology

, M.Sc. Thesis Sharif University of Technology Sharebiani, Hiva (Author) ; Hosseini, Hassan (Supervisor) ; Rezaee, Abdolrahim (Supervisor)

Abstract

In this project, to disambiguate the relation of individual and group selection, interlevel interactions are differentiated into the interaction of the level with the environment and the interaction of levels’ individuality. According to this differentiation, the process of natural selection is introduced by two positive and negative aspects. The positive selection evaluates the adaptation of a level to its environment, and the negative selection assesses the self-consistency of levels. Therefore, the interactor and manifestor of adaptation are affected and targeted by positive selection, respectively, whereas the negative selection targets the self-inconsistent unit. As a result, firstly,...

A Carbonate Reservoir Characterization Using AVO Analysis on 3D Seismic Data

, Ph.D. Dissertation Sharif University of Technology Hassanzadeh Azar, Javid (Author) ; Pishvaie, Mahmoud Reza (Supervisor) ; Javaherian, Abdolrahim (Supervisor) ; Nabi Bidhendi, Majid (Co-Advisor)

Abstract

In this project, some issues facing the application of AVO in carbonate reservoirs were studied,reviewed and discussed: physical relationships between elastic and reservoir rock properties to estimate compressional and shear wave velocities both on core measurements and well logging data, sensitivity analysis for Gassmann‐Biot and Kuster‐Toksoz rock physics models on the representative carbonate samples, lithology discrimination and reservoir characterization in carbonate intervals using AVO seismic attributes and specifically LambdaRho‐MuRho approach.The studied area (Azadegan Oil Field) is an area about 1174 km2 of 3D seismic data and was containing of six wells in the time of study. In...