NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
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20040111574 Massachusetts Inst. of Tech., Cambridge, MA<br />
Feasibility <strong>and</strong> Design of Blast Mitigation Systems for Naval Applications Using Water Mist Fire Suppression Systems<br />
Kitchenka, Julie A.; Jun. 2004; 127 pp.; In English<br />
Report No.(s): AD-A425627; No Copyright; Avail: CASI; A07, Hardcopy<br />
The recent trend of using fine water mist systems to replace the legacy HALON-1301 fire suppression systems warrants<br />
further study into other applications of the water mist systems. Preliminary research <strong>and</strong> investigation indicates that fine mists<br />
(20-25 micro droplet size) may reduce peak overpressures of a shock wave traveling through a space. Such pressure reductions<br />
could be used to mitigate the destructive effects of a shock wave (initiated by an explosive device) traveling through a<br />
structure. Currently these blast mitigation effects have only been demonstrated in small-scale shock tube tests <strong>and</strong> computer<br />
simulations. Uncertainty exists as to the scalability of such a system. The intention of this research is to investigate the<br />
applicability of such a blast mitigation system for shipboard use. Study into the degree of mitigation necessary to make a<br />
system practical for shipboard installation was conducted. In addition, a theoretical study of the mechanisms of blast<br />
mitigation using water mists was completed.<br />
DTIC<br />
Fires; Mist; Water<br />
20040111701 Michigan State Univ., East Lansing, MI<br />
Improved Control Authority in Flexible Structures Using Stiffness Variation<br />
Mukherjee, Ranjan; Shaw, Steven W.; Aug. 25, 2004; 10 pp.; In English<br />
Contract(s)/Grant(s): F49620-03-1-0184<br />
Report No.(s): AD-A425857; AFRL-SR-AR-TR-04-0465; No Copyright; Avail: CASI; A02, Hardcopy<br />
This is the final progress report for AFOSR Contract #F49620-03-1-0184, funded during the period Apr- December 2003.<br />
It summarizes the work done towards development of a new approach to vibration control of flexible structures. The main goal<br />
of this research is to improve control authority in structural systems through methodical stiffness variation, specifically, using<br />
end forces, such as follower forces.<br />
DTIC<br />
Stiffness<br />
20040111718 Naval Research Lab., Washington, DC<br />
LOFAR <strong>Scientific</strong> Memor<strong>and</strong>um Number 6: The LOFAR Site <strong>and</strong> Its Impact on the Key Astronomical Projects<br />
Lazio, T. J.; Cohen, A. S.; Crane, P. C.; Weiler, K. W.; Jun. 21, 2004; 19 pp.; In English; Original contains color illustrations<br />
Report No.(s): AD-A425886; NRL/MR/7210--04-8773; No Copyright; Avail: CASI; A03, Hardcopy<br />
We consider the impact of potential LOFAR sites on the key astronomical projects set for the telescope. We compare the<br />
sites on the basis of the total fraction of the sky accessible <strong>and</strong> on the basis of the total fraction of the Galactic plane accessible.<br />
The former criterion is most important for extragalactic studies while the latter criterion is most important for studies of the<br />
Milky Way. Of the three sites, the Netherl<strong>and</strong>s, the Southwest USA, <strong>and</strong> Western Australia, we find that Western Australia<br />
provides both the largest fraction of the sky accessible <strong>and</strong> the largest fraction of the Galactic plane accessible, followed by<br />
the Southwest United State <strong>and</strong> the Netherl<strong>and</strong>s, in that order. This analysis has been conducted independently of the work<br />
of the LOFAR Site Evaluation Committee (SEC) <strong>and</strong> has not been reviewed by nor is it endorsed by that body.<br />
DTIC<br />
Astronomy; Interferometry; Lofar; Low Frequencies<br />
20040112032 <strong>NASA</strong> Glenn Research Center, Clevel<strong>and</strong>, OH, USA<br />
Application of Recommended Design Practices for Conceptual Nuclear Fusion Space Propulsion Systems<br />
Williams, Craig H.; June 17, 2004; 23 pp.; In English; 10th Joint Propulsion Conference <strong>and</strong> Exhibit, 11-14 Jul. 2004, Fort<br />
Lauderdale, FL, USA<br />
Contract(s)/Grant(s): 973-90-01<br />
Report No.(s): AIAA Paper 2004-3534; Copyright; Avail: CASI; A03, Hardcopy<br />
An AIAA Special Project Report was recently produced by AIAA’s Nuclear <strong>and</strong> Future Flight Propulsion <strong>Technical</strong><br />
Committee <strong>and</strong> is currently in peer review. The Report provides recommended design practices for conceptual engineering<br />
studies of nuclear fusion space propulsion systems. Discussion <strong>and</strong> recommendations are made on key topics including design<br />
reference missions, degree of technological extrapolation <strong>and</strong> concomitant risk, thoroughness in calculating mass properties<br />
(nominal mass properties, weight-growth contingency <strong>and</strong> propellant margins, <strong>and</strong> specific impulse), <strong>and</strong> thoroughness in<br />
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