Possible Military Applications of High-Speed Airbreathing Propulsion in the XX1st Century- an European Vision

2003 ◽  
Author(s):  
Francois Falempin ◽  
Laurent SERRE
Keyword(s):  
High Speed ◽  
Military Applications

Approaches to Synchronise Conventional Measurements with Optical Techniques at High Strain Rates

2011 ◽  
Vol 70 ◽  
pp. 75-80 ◽  
Author(s):  
Duncan A. Crump ◽  
Janice M. Dulieu-Barton ◽  
Marco L. Longana
Keyword(s):  
Polymer Composites ◽  
High Speed ◽  
High Strain ◽  
Image Correlation ◽  
Test Machine ◽  
Strain Rates ◽  
High Strain Rates ◽  
Optical Techniques ◽  
Specific Loading ◽  
Military Applications

Polymer composites are increasingly being used in high-end and military applications, mainly due to their excellent tailorability to specific loading scenarios and strength/stiffness to weight ratios. The overall purpose of the research project is to develop an enhanced understanding of the behaviour of fibre reinforced polymer composites when subjected to high velocity loading. This is particularly important in military applications, where composite structures are at a high risk of receiving high strain rate loading, such as those resulting from collisions or blasts. The work described here considers an approach that allows the collection of full-field temperature and strain data to investigate the complex viscoelastic behaviour of composite material at high strain rates. To develop such a data-rich approach digital image correlation (DIC) is used to collect the displacement data and infra-red thermography (IRT) is used to collect temperature data. The use of optical techniques at the sampling rates necessary to capture the behaviour of composites subjected to high loading rates is novel and requires using imaging systems at the far extent of their design specification. One of the major advantages of optical techniques is that they are non-contact; however this also forms one of the challenges to their application to high speed testing. The separate camera systems and the test machine/loading system must be synchronised to ensure that the correct strain/temperature measurement is correlated with the correct temporal value of the loading regime. The loading rate exacerbates the situation where even at high sampling rates the data is discrete and therefore it is difficult to match values. The work described in the paper concentrates on investigating the possibility of the high speed DIC and synchronisation. The limitations of bringing together the techniques are discussed in detail, and a discussion of the relative merits of each synchronisation approach is included, which takes into consideration ease of use, accuracy, repeatability etc.

scholarly journals The limits to ‘spin-off’: UK defence R & D and the development of gallium arsenide technology

2011 ◽  
Vol 45 (1) ◽  
pp. 97-121 ◽  
Author(s):  
GRAHAM SPINARDI
Keyword(s):  
Gallium Arsenide ◽  
Mobile Phone ◽  
High Speed ◽  
Semiconductor Materials ◽  
Early Access ◽  
Leading Role ◽  
Limited Success ◽  
Military Applications ◽  
The Future ◽  
Defence Procurement

AbstractUK defence R & D played a leading role in the development of gallium arsenide and other III–V semiconductor materials. Often touted as the semiconductor of the future because of its potential for high-speed computing, gallium arsenide had unique properties compared to silicon that made it attractive for military applications. Some consumer applications were also developed, and these eventually became significant with its use in mobile phone handsets in the mid-1990s. However, despite the apparent advantage of close links to the defence establishments and early access to expertise in III–V technologies, UK companies had limited success in these civil markets, preferring instead to focus on defence procurement.

Discussion on Analytical Approaches to the Study of Vessel Dynamics—Outcomes of the Two-Part Minisymposium at the 2007 SIAM Conference on Applications of Dynamical Systems

2008 ◽  
Vol 45 (04) ◽  
pp. 211-220
Author(s):  
Laura Alford ◽  
Atul Banik ◽  
Vadim Belenky ◽  
Katrin Ellermann ◽  
Hirotada Hashimoto ◽  
...  
Keyword(s):  
Dynamical Systems ◽  
High Speed ◽  
Chaotic Behavior ◽  
Applied Mathematics ◽  
Ship Motions ◽  
Parametric Rolling ◽  
Strongly Nonlinear ◽  
Current Trends ◽  
Military Applications ◽  
Analytical Approaches

While the study of ship stability dates back to Archimedes, modern research on vessel dynamics is at the forefront of applied mathematics. Large-amplitude ship motions result in strongly nonlinear, even chaotic behavior. The current trends toward high-speed and unique hullform vessels in commercial and military applications have broadened the need for robust mathematical approaches to studying the dynamics of these innovative ships. The presentations in this minisymposium focus on analytical formulations to model and understand the complicated dynamics leading to vessel phenomena such as capsizing, broaching, and parametric rolling.

Design and development of high-speed fiber-optic transmit and receive network for commercial and military applications

2004 ◽  
Author(s):  
Ashok K. Sood ◽  
Sriraj K. Bhadra ◽  
Paul R. Smith ◽  
Yash R. Puri ◽  
Mitchell Cross ◽  
...  
Keyword(s):  
High Speed ◽  
Fiber Optic ◽  
Design And Development ◽  
Military Applications

scholarly journals Ultrafast and Wideband Microwave Photonic Frequency-Hopping Systems: A Review

2020 ◽  
Vol 10 (2) ◽  
pp. 521
Author(s):  
Qidi Liu ◽  
Mable P. Fok
Keyword(s):  
High Speed ◽  
Satellite Communication ◽  
Microwave Photonics ◽  
Frequency Hopping ◽  
Frequency Bandwidth ◽  
Time Frequency ◽  
Data Capacity ◽  
Military Applications ◽  
Microwave Signals ◽  
Electronic Frequency

The increasing demands to enhance information security in data transmission, providing countermeasures against jamming in military applications, as well as boosting data capacity in mobile and satellite communication, have led to a critical need for high-speed frequency-hopping systems. Conventional electronics-based frequency-hopping systems suffer from low data rate, low hopping speed, and narrow hopping-frequency bandwidth. Unfortunately, those are important aspects to facilitate frequency-hopping in emerging microwave systems. The recent advancement of microwave photonics—the use of light to process microwave signals—provides promising solutions to tackle the challenges faced by electronic frequency-hopping systems. In this paper, the challenges of achieving real-time frequency-hopping systems are examined. The operation principles and results of various microwave photonics-enabled frequency-hopping systems are comprehensively discussed, which have wide hopping-frequency bandwidth and frequency-hopping speed from nanoseconds to tens of picoseconds. Lastly, a bio-inspired jamming-avoidance system that could potentially be used for adaptive frequency-hopping is also introduced.

CFD Simulation for a New Ducted-Fan UAV Configuration

2011 ◽  
Vol 110-116 ◽  
pp. 3434-3438
Author(s):  
Omar Zamri
Keyword(s):  
High Speed ◽  
Aerodynamic Characteristic ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Operational Flexibility ◽  
Safety Level ◽  
Ducted Fan ◽  
Main Challenge ◽  
Military Applications ◽  
Aerial Vehicle

Ducted-fan unmanned aerial vehicle (UAV) is very beneficial in many civil and military applications. It has a good operational flexibility similar to helicopter. Normally, the ducting of high speed spinning fan is done for several reasons; the duct produces lift, it provides higher static thrust when compared to a bare fan of the same diameter, substantial noise level from a spinning fan or rotor can be suppressed, and it increase the safety level for both of the system and the user. However, the main challenge is to understand the aerodynamic characteristic of this vehicle. In this paper, computational fluid dynamic (CFD) is used to study the airflow and aerodynamic characteristic on a new configuration of ducted-fan UAV.

scholarly journals Introduction to inmarsat broadband global area network for mobile backbone networks

2020 ◽  
Vol 9 (2) ◽  
pp. 843-852
Author(s):  
Stojce Dimov Ilcev
Keyword(s):  
Mobile Networks ◽  
High Speed ◽  
Base Stations ◽  
Area Network ◽  
Variable Bit Rate ◽  
Wireless Data ◽  
Backbone Networks ◽  
Military Applications ◽  
Global Coverage ◽  
Personal Devices

In this paper is introduced the Inmarsat Global Area Network (GAN) as backbone to mobile networks. At the end of 2005 Inmarsat launched its BGAN service as the first high speed wireless data solutions with voice available on a global basis. The service is accessed through a portable, broadband satellite transceiver with antenna easy to carry as a laptop. The BGAN network consists constellation of Geostationary Earth Orbit (GEO) I-4 and I-5 satellites with an optimized ground network, which interconnects variety of terrestrial infrastructures at local BGAN users. This system employs bandwidth efficient modulation and coding techniques, capable of supporting variable bit-rate services and QoS depending on the needs of the application. The BGAN system is satellite component of 3G IMT-2000, specially the Universal Mobile Telecommunications Service (UMTS) standards. It will provide a near-global coverage overlay for the terrestrial networks, giving users service availability beyond the reach of terrestrial IMT-2000 networks. A range of supported terminals, personal devices, portable and mobile units linked with onboard entertainment, communications systems to remote base stations for civilian and military applications and SCADA or M2M are discussed.

Development Trends of Infrared Focal Plane Array Detectors

2020 ◽  
Vol 22 (9) ◽  
pp. 500-510
Author(s):  
N.A. Kulchitsky ◽  
◽  
A.V. Naumov ◽  
V.V. Startsev ◽  
◽  
...  
Keyword(s):  
High Speed ◽  
Night Vision ◽  
3D Images ◽  
Optical Signals ◽  
Array Detectors ◽  
Military Applications ◽  
Thermal Imagers ◽  
The Military ◽  
Development Paradigm ◽  
Thermal Imaging Equipment

Since its inception, the market for infrared (IR) thermal imaging equipment has grown, primarily, due to its military applications. Today, the military sector still provides some growth for the market, but its development paradigm has changed. Now the main growth in the market is provided by the sectors of civil and medical thermography, security and fire surveillance, personal night vision systems and local security niches (municipal, private, etc.). The devices using thermal imagers make it possible to detect in conditions of poor visibility, to detect people with high temperature in the crowd. In the last decade, a number of new directions and trends have been outlined in infrared photoelectronics. They are associated with increasing the resolution of systems, improving methods for recording ultra-weak optical signals, creating high-speed and multispectral systems, forming infrared 3D images According to forecast of Maxtech International (USA) and today's estimates of the authors, the market for infrared systems (civil and military) amounted to 10.5 billion dollars in 2017, and could reach 20 billion dollars by 2025. Due to the pandemic, we have restated the Maxtech International's forecasts upwardly for the medium term.

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