Changes between Version 29 and Version 30 of TBR/UserApp/MMS_Instruments_Suite


Ignore:
Timestamp:
Dec 6, 2011, 1:37:49 AM (8 years ago)
Author:
Ivaylo
Comment:

/* DC-8 MMS Instrument Improvement */

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  • TBR/UserApp/MMS_Instruments_Suite

    v29 v30  
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    94 To increase system performance and reliability, we propose to improve the following DC-8 MMS sub-systems
     94To increase system performance and reliability, we propose to improve the following DC-8 MMS sub-systems:
    9595
    96 The current dynamic and static pressure measurements include very long pneumatic lines, which span the width and half the length of the DC-8 fuselage. The long lines have proven to be unreliable and prone to leakage. The long transmission line system shows significant signal propagation time delays, oscillations, and frequency dependent damping. Dedicated transducers will sample the outside pressure with a 12-inch connecting line. The payload integration will require minor mechanical and electrical efforts for the transducer installations.
     96 * The current dynamic and static pressure measurements include very long pneumatic lines, which span the width and half the length of the DC-8 fuselage. The long lines have proven to be unreliable and prone to leakage. The long transmission line system shows significant signal propagation time delays, oscillations, and frequency dependent damping. Dedicated transducers will sample the outside pressure with a 12-inch connecting line. The payload integration will require minor mechanical and electrical efforts for the transducer installations.
    9797
    98 We also plan to replace these transducers with vibrating quartz digital pressure sensor, with temperature compensation from ParoScientific. The ParoScientific transducers have significantly better accuracy (0.01% compared to Rosemount's 0.1% full scale) and lower long-term drifts. The improvement in the pressure measurements translates to higher accuracy in static pressure, static temperature, and wind products.
     98 * We also plan to replace these transducers with vibrating quartz digital pressure sensor, with temperature compensation from ParoScientific. The ParoScientific transducers have significantly better accuracy (0.01% compared to Rosemount's 0.1% full scale) and lower long-term drifts. The improvement in the pressure measurements translates to higher accuracy in static pressure, static temperature, and wind products.
    9999
    100 We propose to update the data system to operate autonomously similar to the ER-2 MMS without an operator on-board during a science flight. An operator at the console, in the passenger cabin, is still a requirement during the testing and validation phase. The instrument is operated with a simple on/off switch. This improvement reduces the seat requirement during science flights and reduces the number of field personnel.
     100 * We propose to update the data system to operate autonomously similar to the ER-2 MMS without an operator on-board during a science flight. An operator at the console, in the passenger cabin, is still a requirement during the testing and validation phase. The instrument is operated with a simple on/off switch. This improvement reduces the seat requirement during science flights and reduces the number of field personnel.
    101101
    102 Special pilot induced flight maneuvers are required to calibrate and to validate system performance on each flight. The calibrating maneuver typically includes 5 sinusoidal ± 2° of pitching, 5 sinusoidal ± 2° of yawing, and 360° square box pattern. The pitch and yaw maneuvers consume negligible flight time; they are usually executed in transit. It takes the DC-8 about 10 minutes to complete the four 90-degree of the box pattern. We have developed a new calibration algorithm and reduced the box pattern frequency by half.
     102 * Special pilot induced flight maneuvers are required to calibrate and to validate system performance on each flight. The calibrating maneuver typically includes 5 sinusoidal ± 2° of pitching, 5 sinusoidal ± 2° of yawing, and 360° square box pattern. The pitch and yaw maneuvers consume negligible flight time; they are usually executed in transit. It takes the DC-8 about 10 minutes to complete the four 90-degree of the box pattern. We have developed a new calibration algorithm and reduced the box pattern frequency by half.
    103103= ER-2 MMS Instrument Integration =
    104104