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  • 1
    Electronic Resource
    Electronic Resource
    A note on the additivity of diffusional resistances (1955)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 1 (1955), S. 129-129 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690010120
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A note on the additivity of diffusional resistances (1955)
    Wiley
    Details
    Publication Date: 1955-03-01
    Print ISSN: 0001-1541
    Electronic ISSN: 1547-5905
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Wiley on behalf of American Institute of Chemical Engineers.
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    PAPER CURRENT
  • 3
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    A single-axis testbed for slewing control experiments (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A simple single-axis testbed is described, and initial experimental results are presented to illustrate collocated and noncollocated control for this structure. The testbed is made up of a pair of single-axis flexible beams attached to a DC servo motor. An optical encoder and strain gauges provide hub and beam position information, respectively. The system is driven by an IBM PC system; with a motor controller, a programmable digital filter processes position error information through user-selected gains and pole-zero configurations. A 25-kHz data acquisition system provides the necessary interface between processor and motor. The control approaches currently being investigated include collocated PD control and noncollocated phase compensation.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Initial investigations of an adaptive discrete-time controller for nonlinear time-varying robotic models (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The objective of this paper is to design a discrete-time controller which forces y(t) = F(q(t),q'(t)) to follow a desired trajectory, when non-linearities may be uncertain. A self-tuning adaptive control algorithm is then developed that addresses three types of errors: (1) error due to model linearization; (2) errors due to controlling a time-varying plant; and (3) errors due to discretization.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Langley Research Center, Ongoing Progress in Spacecraft Controls; p 77-106
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Design and fabrication of an aerobrake mock-up (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The paper reports on the design and fabrication of a Mars aerobrake mockup that has been used in a series of underwater neutral buoyancy tests designed to address this on-orbit assembly issue. Particular attention is given to the aerobrake shell, truss components, and fastener issues. It is noted that soft docking alignment fasteners, fasteners between petals, and fasteners to connect the petal-to-petal truss members are all needed for this mockup.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: AIAA PAPER 91-0658
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    A fast algorithm for control and estimation using a polynomial state-space structure (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One of the major problems associated with the control of flexible structures is the estimation of system states. Since the parameters of the structures are not constant under varying loads and conditions, conventional fixed parameter state estimators can not be used to effectively estimate the states of the system. One alternative is to use a state estimator which adapts to the condition of the system. One such estimator is the Kalman filter. This filter is a time varying recursive digital filter which is based upon a model of the system being measured. This filter adapts the model according to the output of the system. Previously, the Kalman filter has only been used in an off-line capacity due to the computational time required for implementation. With recent advances in computer technology, it is becoming a viable tool for use in the on-line environment. A distributed Kalman filter implementation is described for fast estimation of the state of a flexible arm. A key issue, is the sensor structure and initial work on a distributed sensor that could be used with the Kalman filter is presented.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Langley Research Center, Fourth NASA Workshop on Computational Control of Flexible Aerospace Systems, Part 1; p 41-56
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Distributed digital signal processors for multi-body flexible structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Multi-body flexible structures, such as those currently under investigation in spacecraft design, are large scale (high-order) dimensional systems. Controlling and filtering such structures is a computationally complex problem. This is particularly important when many sensors and actuators are located along the structure and need to be processed in real time. This report summarizes research activity focused on solving the signal processing (that is, information processing) issues of multi-body structures. A distributed architecture is developed in which single loop processors are employed for local filtering and control. By implementing such a philosophy with an embedded controller configuration, a supervising controller may be used to process global data and make global decisions as the local devices are processing local information. A hardware testbed, a position controller system for a servo motor, is employed to illustrate the capabilities of the embedded controller structure. Several filtering and control structures which can be modeled as rational functions can be implemented on the system developed in this research effort. Thus the results of the study provide a support tool for many Control/Structure Interaction (CSI) NASA testbeds such as the Evolutionary model and the nine-bay truss structure.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-190183 , NAS 1.26:190183
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Computational tools for multi-linked flexible structures (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A software module which designs and tests controllers and filters in Kalman Estimator form, based on a polynomial state-space model is discussed. The user-friendly program employs an interactive graphics approach to simplify the design process. A variety of input methods are provided to test the effectiveness of the estimator. Utilities are provided which address important issues in filter design such as graphical analysis, statistical analysis, and calculation time. The program also provides the user with the ability to save filter parameters, inputs, and outputs for future use.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-186139 , NAS 1.26:186139
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Design issues for Mars planetary rovers (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The paper presents some of the design issues and vehicle requirements that need to be addressed for the Mars planetary rovers. Some of the designs currently being investigated, including the JPL rover, the Martin Marietta vehicle, and the French Space Agency's VAP project, are examined. The rover must satisfy such mission requirements as surveying the terrain, preparing the landing sites, loading and unloading components for base operations, and aiding in the recovery of in situ materials.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: AIAA PAPER 93-0957 , AIAA, AHS, and ASEE, Aerospace Design Conference; Feb 16, 1993 - Feb 19, 1993; Irvine, CA; United States|; 11 p.
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Mars aerobrake assembly simulation (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: On-orbit assembly operation simulations in neutral buoyancy conditions are presently undertaken by a partial/full-scale Mars mission aerobrake mockup, whose design, conducted in the framework of an engineering senior students' design project, involved several levels of constraints for critical physical and operational features. Allowances had to be made for the auxiliary constraints introduced by underwater testing, as well as the subsegmenting required for overland shipment to the neutral-buoyancy testing facility. This mockup aerobrake's fidelity is determined by the numerous, competing design objectives.
    Keywords: SOCIAL SCIENCES (GENERAL)
    Type: AIAA PAPER 92-1095
    Format: text
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    NASA TECHNICAL REPORTS
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