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  • 1
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    Method of Detecting System Function by Measuring Frequency Response (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Real time battery impedance spectrum is acquired using one time record, Compensated Synchronous Detection (CSD). This parallel method enables battery diagnostics. The excitation current to a test battery is a sum of equal amplitude sin waves of a few frequencies spread over range of interest. The time profile of this signal has duration that is a few periods of the lowest frequency. The voltage response of the battery, average deleted, is the impedance of the battery in the time domain. Since the excitation frequencies are known, synchronous detection processes the time record and each component, both magnitude and phase, is obtained. For compensation, the components, except the one of interest, are reassembled in the time domain. The resulting signal is subtracted from the original signal and the component of interest is synchronously detected. This process is repeated for each component.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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  • 2
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    Faying Surface Lubrication Effects on Nut Factors (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-11
    Description: Bolted joint analysis typically is performed using nut factors derived from textbooks and procedures from program requirement documents. Joint specific testing was performed for a critical International Space Station (ISS) joint. Test results indicate that for some configurations the nut factor may be significantly different than accepted textbook values. This paper presents results of joint specific testing to aid in determining if joint specific testing should be performed to insure required preloads are obtained.
    Keywords: Mechanical Engineering
    Type: 38th Aerospace Mechanisms Symposium; 157-162; NASA/CP-2006-214290
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  • 3
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    Low-Shear Microencapsulation and Electrostatic Coating (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A report presents additional information on the topic of a microencapsulation electrostatic processing system. Information in the report includes micrographs of some microcapsules, a set of diagrams that schematically depict the steps of an encapsulation process, and brief descriptions of (1) alternative versions of the present encapsulation processes, (2) advantages of the present microencapsulation processes over prior microencapsulation processes, and (3) unique and advantageous features of microcapsules produced by the present processes.
    Keywords: Man/System Technology and Life Support
    Type: MSC-22938 , NASA Tech Briefs, April 2005; 31
    Format: application/pdf
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  • 4
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    Five-Axis, Three-Magnetic-Bearing Dynamic Spin Rig (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Five-Axis, Three-Magnetic-Bearing Dynamic Spin Rig is an apparatus for vibration testing of turbomachine blades in a vacuum at rotational speeds from 0 to 40,000 rpm. This rig includes (1) a vertically oriented shaft on which is mounted an assembly comprising a rotor holding the blades to be tested, (2) two actively controlled heteropolar radial magnetic bearings at opposite ends of the shaft, and (3) an actively controlled magnetic thrust bearing at the upper end of the shaft. This rig is a more capable successor to a prior apparatus, denoted the Dynamic Spin Rig (DSR), that included a vertically oriented shaft with a mechanical thrust bearing at the upper end and a single actively controlled heteropolar radial magnetic bearing at the lower end.
    Keywords: Aircraft Design, Testing and Performance
    Type: LEW-17757-1 , NASA Tech Briefs, October 2005; 21-22
    Format: application/pdf
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  • 5
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    Microparticle Flow Sensor (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The microparticle flow sensor (MFS) is a system for identifying and counting microscopic particles entrained in a flowing liquid. The MFS includes a transparent, optoelectronically instrumented laminar-flow chamber (see figure) and a computer for processing instrument-readout data. The MFS could be used to count microparticles (including micro-organisms) in diverse applications -- for example, production of microcapsules, treatment of wastewater, pumping of industrial chemicals, and identification of ownership of liquid products.
    Keywords: Instrumentation and Photography
    Type: MSC-23277 , NASA Tech Briefs, January 2005; 6-7
    Format: application/pdf
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  • 6
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    Fluid Quick Disconnects - ISS Lessons Learned (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: The International Space Station has many fluid systems on the United States On-orbit Segment supporting thermal control, life support, extravehicular activities and payloads. To facilitate assembly and maintenance, fluid quick disconnect (QD) fittings are used throughout these systems for both internal pressurized modules and for external systems exposed to space. In the years since full scale development began on these QDs, a number of design and performance issues have surfaced and required substantial program funds and activity to rectify. This paper is intended to describe the most significant of these issues, their resolutions, and the lessons learned from the ISS experience.
    Keywords: Spacecraft Design, Testing and Performance
    Type: International Conference on Environmental Systems; Jul 17, 2006 - Jul 20, 2006; Norfolk, VA; United States
    Format: text
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  • 7
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    Pulse-Flow Microencapsulation System (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The pulse-flow microencapsulation system (PFMS) is an automated system that continuously produces a stream of liquid-filled microcapsules for delivery of therapeutic agents to target tissues. Prior microencapsulation systems have relied on batch processes that involve transfer of batches between different apparatuses for different stages of production followed by sampling for acquisition of quality-control data, including measurements of size. In contrast, the PFMS is a single, microprocessor-controlled system that performs all processing steps, including acquisition of quality-control data. The quality-control data can be used as real-time feedback to ensure the production of large quantities of uniform microcapsules.
    Keywords: Aerospace Medicine
    Type: MSC-23659 , NASA Tech Briefs, December 2006; 23
    Format: application/pdf
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  • 8
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    Electromagnetic Forces in a Hybrid Magnetic-Bearing Switched-Reluctance Motor (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Analysis and experimental measurement of the electromagnetic force loads on the hybrid rotor in a novel hybrid magnetic-bearing switched-reluctance motor (MBSRM) have been performed. A MBSRM has the combined characteristics of a switched-reluctance motor and a magnetic bearing. The MBSRM discussed in this report has an eight-pole stator and a six-pole hybrid rotor, which is composed of circular and scalloped lamination segments. The hybrid rotor is levitated using only one set of four stator poles, while a second set of four stator poles imparts torque to the scalloped portion of the rotor, which is driven in a traditional switched reluctance manner by a processor. Static torque and radial force analysis were done for rotor poles that were oriented to achieve maximum and minimum radial force loads on the rotor. The objective is to assess whether simple one-dimensional magnetic circuit analysis is sufficient for preliminary evaluation of this machine, which may exhibit strong three-dimensional electromagnetic field behavior. Two magnetic circuit geometries, approximating the complex topology of the magnetic fields in and around the hybrid rotor, were employed in formulating the electromagnetic radial force equations. Reasonable agreement between the experimental and the theoretical radial force loads predictions was obtained with typical magnetic bearing derating factors applied to the predictions.
    Keywords: Electronics and Electrical Engineering
    Type: NASA/TP--2008-214818 , E-15821-1
    Format: application/pdf
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  • 9
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    System for Controlling a Magnetically Levitated Rotor (2006)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: In a rotor assembly having a rotor supported for rotation by magnetic bearings, a processor controlled by software or firmware controls the generation of force vectors that position the rotor relative to its bearings in a "bounce" mode in which the rotor axis is displaced from the principal axis defined between the bearings and a "tilt" mode in which the rotor axis is tilted or inclined relative to the principal axis. Waveform driven perturbations are introduced to generate force vectors that excite the rotor in either the "bounce" or "tilt" modes.
    Keywords: Mechanical Engineering
    Format: application/pdf
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  • 10
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    Molecular-specific urokinase antibodies (2009)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Antibodies have been developed against the different molecular forms of urokinase using synthetic peptides as immunogens. The peptides were synthesized specifically to represent those regions of the urokinase molecules which are exposed in the three-dimensional configuration of the molecule and are uniquely homologous to urokinase. Antibodies are directed against the lysine 158-isoleucine 159 peptide bond which is cleaved during activation from the single-chain (ScuPA) form to the bioactive double chain (54 KDa and 33 KDa) forms of urokinase and against the lysine 135 lysine 136 bond that is cleaved in the process of removing the alpha-chain from the 54 KDa form to produce the 33 KDa form of urokinase. These antibodies enable the direct measurement of the different molecular forms of urokinase from small samples of conditioned medium harvested from cell cultures.
    Keywords: Life Sciences (General)
    Format: application/pdf
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