Dynamic Modeling and Design of a Bulk-Loaded Liquid Monopropellant Powered Rifle

2008 ◽  
Vol 130 (6) ◽  
Author(s):  
Mark Adams ◽  
Eric J. Barth
Keyword(s):  
Dynamic Model ◽  
Hydrocarbon Fuel ◽  
Chamber Pressure ◽  
Phase Reaction ◽  
Liquid Propellant ◽  
Interior Ballistics ◽  
Time Simulation ◽  
Condensed Phase Reaction ◽  
Power Problem

This paper presents a dynamic model of the interior ballistics of an experimental liquid propellant powered rifle. The liquid propellant powered rifle described utilizes a mixture of hydroxyl ammonium nitrate and hydrocarbon fuel to replace gunpowder typically used in such firearms. The motivation for such a development is to discard the need for a shell casing whereby carrying only propellant and bullets will reduce both the mass and volume per shot carried by the soldier. A first-principles dynamic model of the interior ballistics is derived as a compressible fluid power problem with the chemical liberation of heat within the chamber modeled via a condensed-phase reaction rate law. The model is used to predict the overall performance in terms of ballistic kinetic energy as well as draw design insight regarding the role of friction, chamber geometry, and the profile of chamber pressure with respect to time. Simulation results are presented as well as preliminary experimental results from a proof-of-concept device.

A Compressible Fluid Power Dynamic Model of a Liquid Propellant Powered Rifle

2004 ◽  
Author(s):  
Mark Adams ◽  
Eric J. Barth
Keyword(s):  
Dynamic Model ◽  
Compressible Fluid ◽  
Hydrocarbon Fuel ◽  
Fluid Power ◽  
Chamber Pressure ◽  
Phase Reaction ◽  
Liquid Propellant ◽  
Interior Ballistics ◽  
Time Simulation ◽  
Condensed Phase Reaction

This paper presents a dynamic model of the interior ballistics of an experimental liquid propellant-powered rifle. The liquid propellant-powered rifle described utilizes a misture of Hydroxyl Ammonium Nitrate (HAN) and hydrocarbon fuel to replace gunpowder typically used in such firearms. The motivation for such a development is to discard the need for a shell casing whereby carrying only propellant and bullets will reduce both the mass and volume per shot carried by the soldier. A first-principles dynamic model of the interior ballistics is derived as a compressible fluid power problem with the chemical liberation of heat within the chamber modeled via a condensed-phase reaction rate law. The model is used to predict the overall performance in terms of ballistic kinetic energy as well as draw design insight regarding the role of friction, chamber geometry, and the profile of chamber pressure with respect to time. Simulation results are presented as well as preliminary experimental results from a proof-of concept device.

scholarly journals Role of (H2O)n (n = 1–2) in the Gas-Phase Reaction of Ethanol with Hydroxyl Radical: Mechanism, Kinetics, and Products

ACS Omega ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 5805-5817 ◽  
Author(s):  
Li Xu ◽  
Narcisse T. Tsona ◽  
Shanshan Tang ◽  
Junyao Li ◽  
Lin Du
Keyword(s):  
Hydroxyl Radical ◽  
Gas Phase ◽  
Radical Mechanism ◽  
Phase Reaction ◽  
Gas Phase Reaction

High frequency vibration analysis of ball bearings under radial loads

2016 ◽  
Vol 230 (4) ◽  
pp. 579-588
Author(s):  
Yang Zhao ◽  
Guihua Dong ◽  
Heng Liu ◽  
Fengtao Wang ◽  
Meng Li ◽  
...  
Keyword(s):  
Dynamic Model ◽  
High Frequency ◽  
Vibration Amplitude ◽  
Ball Bearing ◽  
High Frequency Vibration ◽  
Rotating Speed ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Bearing Load

The paper investigates the role of radial load and rotating speed on the high frequency vibration of a deep groove ball bearing. Firstly, a bearing dynamic model with 6-DOF balls was established, considering the interactions between balls, races and the cage. The dynamic model was solved by fourth order varying steps Runge-Kutta integration. The frequency spectrums of dynamic response of races were analyzed with yule-walker and FFT. Secondly, a verification experiment was done with different radial loads and speeds. Finally, compared with the numerical and experimental results, the similar trend of the high frequency vibration was emerged. Higher vibration frequencies result with increasing bearing load; higher vibration amplitude cause by more quickly rotating speed. That is because the nature frequencies of the races are excited by the contact and shock between balls and races when balls leave from the non-load to the load zone. The frequency spectrums were also affected by the interaction between the balls and cage.

Surviving from garbage: the role of informal waste-pickers in a dynamic model of solid-waste management in developing countries

2006 ◽  
Vol 11 (3) ◽  
pp. 371-391 ◽  
Author(s):  
ROCÍO DEL PILAR MORENO-SÁNCHEZ ◽  
JORGE HIGINIO MALDONADO
Keyword(s):  
Developing Countries ◽  
Waste Management ◽  
Solid Waste ◽  
Dynamic Model ◽  
Solid Waste Management ◽  
Waste Collection ◽  
Management Policies ◽  
The Impact ◽  
Waste Pickers

In developing countries, informal waste-pickers (known as scavengers) play an important role in solid waste management systems, acting in a parallel way to formal waste collection and disposal agents. Scavengers collect, from the streets, dumpsites, or landfills, re-usable and recyclable material that can be reincorporated into the economy's production process. Despite the benefits that they generate to society, waste-pickers are ignored when waste management policies are formulated. The purpose of this paper is to integrate the role of scavengers in a dynamic model of production, consumption, and recovery, and to show that, in an economy producing solid waste, efficiency can be reached using a set of specific and complementary policies: a tax on virgin materials use, a tax on consumption and disposal, and a subsidy to the recovery of material. A numerical simulation is performed to evaluate the impact of these policies on landfill lifetime and natural resource stocks. A discussion on the implementation of these instruments is also included.

Impact of water on the BrO + HO2 gas-phase reaction: mechanism, kinetics and products

2019 ◽  
Vol 21 (36) ◽  
pp. 20296-20307 ◽  
Author(s):  
Narcisse T. Tsona ◽  
Shanshan Tang ◽  
Lin Du
Keyword(s):  
Reaction Mechanism ◽  
Gas Phase ◽  
Hydrogen Abstraction ◽  
Phase Reaction ◽  
Gas Phase Reaction

The role of water in preventing the barrierless hydrogen abstraction in the BrO + HO2 reaction is highlighted.

The Research of Mn Modified Carbon Sphere Supported Pt Catalyst Material for Direct Methanol Fuel Cell

2013 ◽  
Vol 648 ◽  
pp. 63-66
Author(s):  
Kun Qi Wang ◽  
Juan Tang ◽  
Ying Gao
Keyword(s):  
Pt Catalyst ◽  
Adsorptive Capacity ◽  
Carbon Sphere ◽  
Phase Reaction ◽  
One Pot ◽  
Composite Support ◽  
Electrochemical Tests ◽  
Direct Methanol ◽  
Supported Pt Catalyst

Mn modified carbon sphere supported Pt catalyst was successfully prepared through a one-pot process. The modification of carbon sphere was operated in liquid phase reaction without any post-processing, and Pt was directly reduced to deposit on the composite support in the same suspension system. The role of Mn as a modifier can show change of adsorption state by XPS, XRD and electrochemical tests. At the same time, the improved the methanol electrooxidation performance, can be proved from lower adsorptive capacity and lower electrooxidation peak potential.

Evidence for the Predominance of Condensed Phase Reaction in Chemical Looping Reactions between Carbon and Oxygen Carriers

2012 ◽  
Vol 116 (46) ◽  
pp. 24496-24502 ◽  
Author(s):  
Nicholas W. Piekiel ◽  
Garth C. Egan ◽  
Kyle T. Sullivan ◽  
Michael R. Zachariah
Keyword(s):  
Condensed Phase ◽  
Chemical Looping ◽  
Phase Reaction ◽  
Oxygen Carriers ◽  
Condensed Phase Reaction
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