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    Improved Speed Control System for the 87,000 HP Wind Tunnel Drive (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the design, installation, and integrated systems tests for a new drive motor speed control system which was part of a recent rehab project for the NASA Lewis 8x6 Supersonic Wind Tunnel. The tunnel drive consists of three mechanically-coupled 29,000 HP wound rotor induction motors driving an axial flow compressor. Liquid rheostats are used to vary the impedance of the rotor circuits, thus varying the speed of the drive system. The new design utilizes a distributed digital control system with a dual touch screen CRT operator console to provide alarm monitoring, logging, and trending. The liquid rheostats are driven by brushtype servomotor systems with magnetostrictive linear displacement transducers used for position feedback. The new system achieved all goals for speed variations with load, motor load balance, and control of total power.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-106840 , E-9404 , NAS 1.15:106840 , International Instrumentation Symposium; May 07, 1995 - May 11, 1995; Denver, CO; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Drive System Enhancement in the NASA Lewis Research Center Supersonic Wind Tunnels (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An overview of NASA Lewis' Aeropropulsion Wind Tunnel Productivity Improvements was presented at the 19th AIAA Advanced Measurement & Ground Testing Technology Conference. Since that time Lewis has implemented subsonic operation in their 10- by 10-Foot Supersonic Wind Tunnel as had been proven viable in the 8- by 6 and 9- by 15-Foot Wind Tunnel Complex and discussed at the aforementioned conference. In addition, two more years of data have been gathered to help quantify the true productivity increases in these facilities attributable to the drive system and operational improvements. This paper was invited for presentation at the 20th Advanced Measurement and Ground Testing Conference to discuss and quantify the productivity improvements in the 10- by 10 SWT since the implementation of less than full complement motor operation. An update on the increased productivity at the 8- by 6 and 9- by 15-Foot facility due to drive system enhancements will also be presented.
    Keywords: Research and Support Facilities (Air)
    Type: NASA/CR-1998-207929 , NAS 1.26:207929 , E-11191 , AIAA Paper 98-2886 , Advanced Measurement and Ground Testing Technology Conference; Jun 15, 1998 - Jun 18, 1998; Albuquerque, NM; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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