Results 51 to 60 of about 42,190 (235)
Business Strategy and the Environment, EarlyView.ABSTRACT This study examines the economic consequences of Digital Technologies Disclosure (DTD), focusing on its impact on the cost of capital. The increasing significance of digital transformation in shaping corporate strategies and market perceptions motivates the study.
Hussein Mohsen Saber Ahmed +2 more
wiley +1 more source
In Situ Methanation on Mars: A Process Concept Study on the Impact of H2/CO2 and Recycle Ratio
Chemie Ingenieur Technik, EarlyView.The rocket propellant methane can be produced on Mars by in situ resource utilization. The H2/CO2 ratio is decisive, and excess H2 is favored for providing sufficient propellant purity. The operation mode—with or without recycling of unreacted reactants—depends on the resource availability of the selected landing site. Abstract For return missions from
Franz Braun +4 more
wiley +1 more source
Acta Astronautica, 2020 A new countermeasure against injection-coupled combustion instabilities in liquid propellant rocket engines is presented. Whereas the problem is usually addressed by adding damping elements such as baffles or resonators to the combustion chamber, this ...
W. Armbruster +4 more
semanticscholar +1 more source
Modeling and Analysis of a LOX/Ethanol Liquid Rocket Engine
Journal of Aerospace Technology and Management, 2018 This work studies the performance and dry mass of the under development LOX/Ethanol L75 liquid rocket engine. To this end, an object-oriented program written in C++ was developed.
Fábio Antônio da Silva Mota +3 more
doaj
Plasmakristall‐4 Experiment: 10 Years of Operation in Orbit
Contributions to Plasma Physics, EarlyView.ABSTRACT Plasmakristall‐4 (PK‐4) is a microgravity complex plasma laboratory operated for 10 years on board the International Space Station. Its main purpose is the particle‐resolved investigation of generic condensed matter phenomena using strongly coupled suspensions of microparticles immersed in low‐pressure gas‐discharge plasmas.
M. Pustylnik +3 more
wiley +1 more source
Model-Based Robust Transient Control of Reusable Liquid-Propellant Rocket Engines
IEEE Transactions on Aerospace and Electronic Systems, 2020 Reusable liquid-propellant rocket engines (LPREs) imply more demanding robustness requirements than expendable ones due to their extended capabilities. Therefore, the goal of this article was to develop a control loop adapted to all the operating phases ...
Sergio Pérez-Roca +6 more
semanticscholar +1 more source
An MPC Approach to Transient Control of Liquid-Propellant Rocket Engines [PDF]
IFAC-PapersOnLine, 2019 The current context of launchers reusability requires the improvement of control algorithms for their liquid-propellant rocket engines. Their transient phases are generally still performed in open loop. In this paper, it is aimed at enhancing the control
Sergio Pérez-Roca +7 more
semanticscholar +1 more source
Resonance in Liquid Rocket Engine Systems [PDF]
Journal of Basic Engineering, 1965 A transient flow analysis of a longitudinal vibration in a liquid rocket engine propellent feed system and its supporting structural framework is described, together with supporting experimental tests. Nonlinear friction losses are used in the partial differential equations of continuity and momentum describing the unsteady flow.
R. H. Fashbaugh, V. L. Streeter
openaire +1 more source
Energy Science &Engineering, EarlyView.This research explores how fluid flow, structural movement, and sound interact in an elastic baffle system. Using a numerical approach based on the finite element method, the study analyzes how noise and vibrations change with different baffle configurations. The findings reveal that shortening the baffle by half reduces noise transmission by 9%, while
Tohid Adibi +5 more
wiley +1 more source
Modeling of Shutdown Process in Liquid Propellant Rocket Engines [PDF]
فصلنامه علوم و فناوری فضایی, 2014 The effects of liquid propellant rocket engines thrust termination transients are important in achieving the launch vehicle’s desired final velocity with the required precision.
M. Shafiey Dehaj +4 more
doaj