High altitude test program for a Mars subsonic parachute
This paper describes one method by which an Earth qualification test program for Mars parachute can be conducted.
Mars↗
Engineering topics
Bruno, R.
Publications and source records attributed to Bruno, R..
Mars Exploration Rover parachute decelerator system program review
In the Mars Exploration Rover (MER) Mission, NASA returns to the red planet, following the extremely successful Mars Pathfinder in 1997. The mission will send two lander-rovers to the surface of Mars with separate launches in May and June, 2003. This paper describes the Parachute Decelerator System for the entry vehicle.
Mars Exploration Rover MER parachute decelerator s↗
Opportunities and limitations in low earth subsonic testing for qualification of extraterrestrial supersonic parachute designs
Parachutes for Mars and other planetary missions often need to operate at supersonic speeds in very low density atmospheres. Flight testing of such parachutes at appropriate conditions in the Earth's atmosphere is possible at high altitudes.
testing extraterrestrial Mars DGB↗
The Mars Exploration Rovers entry descent and landing and the use of aerodynamic decelerators
The Mars Exploration Rovers (MER) project, the next United States mission to the surface of Mars, uses extensive aerodynamic deceleration in during its entry, descent and landing (EDL) phase.
EDL↗
Payload infrastructure
Explore the source record for details and available documents.
mission architecture↗
Interferometry Program Flight Experiment #1: Objecties and Results
The Interferometry Program EXperiments (IPEX) I and II are a series of flight experiments designed to characterize microdynamics of structures in space.
thermo↗
Heliospheric Plasma Sheet and Coronal Streamers
In-situ measurements of solar wind plasma and magnetic field between 0.3 and 1 AU are used to investigate the structure of the heliospheric plasma sheet, namely the region of enhanced plasma density that surrounds the helioshperic current sheet.
solar wind↗
Implementation of a Gravity Compensating Mirror on a Large Aperture Antenna
A proposed technique for compensating gravity-induced structural deformations on the main reflector of a large aperture antenna is to utilize a deformable flat plate (DFP) installed at one of the mirror locations in the beam waveguide optics.
deformable↗
On the nature of Alfven inward modes in the solar wind
Within the past decade there has been a remarkable production of papers both theoretical and observational that have shed some light on the intriguing and unsolved problem of the Alfvenic MHD turbulence in the solar wind. Although the scientific community has agreed upon many points which are at the basis of the temporal and radial evolution of the turbulence like the solar origin of most of the outward Alfven modes or the importance of non-linear interactions between outward and inward modes. there are still many open issues which are of fundamental importance for a complete understanding of the phenomenon. One of these key-issues is about the real nature of these inward modes. are they real propagating Alfven waves or rather static structures convected by the wind or a mixture of both? The present analysis represents an effort towards a better understanding of the nature and the role of these modes.
Bruno, R.↗
Intermittency and extended self-similarity in the solar wind turbulence
Using the satellite measurements of the velocity field in the interplanetary plasma. we present some analysis which show the presence of a self-similar intermittent state in the solar wind turbulence. We used the so called Extended Self-Similarity hypothesis, which is well visible in the solar wind turbulence, showing convincing evidences for the presence of universal anomalous scaling laws. Through the Extended Self-Similarity we are able to calculate the scaling exponents of the velocity structure functions with very small uncertainties, and we show that these scaling exponents are in very good agreement with the multifractal models describing intermittency in magnetohydrodynamic flows.
Bruno, R.↗
Adaptive Adjustment of a Precision Truss Structure: Experimental Validation
Previous analytical studies have shown the feasibility of using a limited number of active members to adaptively alter the structural shape or behavior to other desired states. As a demonstration of this concept, this paper describes the results of a sequence of validation tests, their correlation with the analytical results, and the problems encountered.
Precision↗
Actuator tuning for nonlinear truss structures - A neural network approach
The optimal actuator placement problem encompasses finding their best locations and best gains. The latter is referred to as tuning the actuators. This paper deals with tuning a given set of actuators in presence of known structural nonlinearities arising from gaps at some joints. For this purpose, an efficient neural network-based algorithm is proposed and illustrated using numerical simulations.
Toomarian, N.↗
Adaptive adjustment of a precision truss structure - Experimental validation
Previous analytical studies have shown the feasibility of using a limited number of active members to adaptively alter the structural shape or behavior to other desired states. As a demonstration of this concept, this paper describes the results of a sequence of validation tests, their correlation with the analytical results, and the problems encountered. An existing full scale, space-erectable, high precision truss structure was used. For the most part, the results showed good agreement with the analysis. However, micron level nonlinearities in the structural behavior were discovered. The significance of the presence of these nonlinearities in precision structures and their impact on the basic premise of adaptivity are discussed.
Salama, M.↗
A Code Phase Division Multiple Access (CPDMA) technique for VSAT satellite communications
A reference concept and implementation relevant to the application of Code Phase Division Multiple Access (CPDMA) to a high capacity satellite communication system providing 16 Kbps single hop channels between Very Small Aperture Terminals (VSAT's) is described. The description includes a potential implementation of an onboard CPDMA bulk demodulator/converter utilizing programmable charge coupled device (CCD) technology projected to be available in the early 1990's. A high level description of the system architecture and operations, identification of key functional and performance requirements of the system elements, and analysis results of end-to-end system performance relative to key figures of merit such as spectral efficiency are also provided.
Bruno, R.↗
A multiobjective approach to integrated control, structure and optical design
The underlying mathematical formulation and issues associated with integrated control, structure, and optical design are discussed. Topics addressed include the development of cost functionals, optimization in the vector objective setting, and computational aspects of the optimization problem with special emphasis on model reduction strategies. Results on simple design problems are presented.
Milman, M.↗
Combined control-structural optimization
An approach to combined control-structural optimization aimed at enhancing early design trade-offs is outlined and illustrated by numerical examples. The approach employs a homotopic strategy and is capable of generating families of designs that can be used in early trade studies. Analytical results are obtained for classes of structure/control objectives with LQG and LQR costs. For these, it is demonstrated that global optima can be computed for small values of the homotopy parameter.
Milman, M.↗