Results 61 to 70 of about 1,005,662 (212)

Effect of Resonant Mixer Granulation Parameters on Prill Properties

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT Resonant mixing is a promising processing approach to manage mixing of materials with high solids content and has shown strong performance for mixing powders and pastes in energetic materials. This has led to the exploration of the approach for granulation of primary particles into millimeter‐sized agglomerates, including for generating ...
Hannah Cook, S. Emad Renfroe, Jessica Keith, Eleanor E. Radlinski, Albin Darby, Blair Brettmann   +5 more
wiley   +1 more source

Effect of Hydroxyl‐Terminated Polybutadiene Grade on Rheology and Settling of High‐Solids Mixtures of Mock Propellants

Propellants, Explosives, Pyrotechnics, EarlyView.
ABSTRACT The most common binder used in composite rocket propellants is based on the pre‐polymer hydroxyl‐terminated polybutadiene (HTPB). It has been shown to have excellent mechanical properties and a long life once crosslinked, and studies have examined the kinetics of crosslinking and pot life of energetic formulations with HTPB.
Laurel Hilger, Alexandra A. Dobbs, Blair Brettmann   +2 more
wiley   +1 more source

Influence of time on bond characteristics between extruded PVC tube and cast HTPB/IPDI rocket propellant [PDF]

Scientific Technical Review, 2017
This paper is dealing about the possibility of using thermoplastic material as an inhibitor for solid composite propellant in a long period of time. A basic point in this consideration is an analysis of bond characteristics between the extruded PVC tube ...
Radulović Jovan, Milojković Aleksandar
doaj  

Sliding Mode Control in Aerospace Applications: A Survey

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley   +1 more source

Impulsive Thruster Control for Spacecraft Docking: A Lyapunov Approach

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT In this work, we propose a novel discontinuous impulsive controller for nonlinear systems that admit continuous‐time stabilizing controllers. Specifically, we develop a technique for generating discrete control pulses of short duration based on the Lyapunov candidate function associated with a continuous‐time controller. Our method uses a real‐
Xun Liu, Hashem Ashrafiuon, Sergey G. Nersesov   +2 more
wiley   +1 more source

Studies on composite solid propellant with tri-modal ammonium perchlorate containing an ultrafine fraction

Defence Technology, 2017
Composite solid propellant is prepared using tri-modal Ammonium perchlorate (AP) containing coarse, fine and ultrafine fractions of AP with average particle size (APS) 340, 40 and 5 μm respectively, in various compositions and their rheological ...
K.V. Suresh Babu, P. Kanaka Raju, C.R. Thomas, A. Syed Hamed, K.N. Ninan   +4 more
doaj   +1 more source

Defining Lines of Defense Against Change Propagation Using Cause‐Consequence Analysis

Systems Engineering, EarlyView.
ABSTRACT Complex engineered systems are the core of modern society. So that engineered systems and infrastructure can be sustainable and offer value over the course of their lifespan, there is a growing need for such systems to be changeable. Yet, establishing and operationalizing changeability can be challenging due to the potential for change ...
Lindsey Jacobson, Scott Ferguson
wiley   +1 more source

Quantifying and Tracking Flexibility of System Elements to Support (Re)Design Decision‐Making

Systems Engineering, EarlyView.
ABSTRACT Evolving objectives and requirements, risk management processes, and external disruptions frequently drive change in engineered systems. Due to these pressures, system architects must anticipate and manage change throughout a system's lifecycle. Yet, managing change is challenging due to the risk of change propagation.
Lindsey Jacobson, Scott Ferguson
wiley   +1 more source

Supporting Young Foreign Language Learners With Image Generative AI in Digital Multimodal Composing: Benefits and Challenges

TESOL Quarterly, EarlyView.
Abstract Integrating generative artificial intelligence (GenAI) into digital multimodal composing (DMC) offers promising avenues for young Foreign Language (FL) learners' learning experiences. Image‐based GenAI tools enable students to generate personalized images from written prompts to help convey meanings, and DMC combines text, images, and sound to
Alex Lap‐kwan Lam
wiley   +1 more source

OXIDISERS OF COMPOSITE SOLID ROCKET PROPELLANTS. PART 1

PROBLEMY TECHNIKI UZBROJENIA
The paper presents information about most commonly used, and perspective, solid oxidisers dedicated to present composite rockets propellants. It widely covers the safety of using, and general methods of production, and the energetic parameters of discussed compositions.
Marcin Nita, Łukasz Czerniak, Ada Galińska   +2 more
openaire   +1 more source