• Our next meeting will be a status meeting on 8 January, 2015
  • We’ll hold a strategic / tactical meeting on 15 January, 2015 to break down the MDAO research tasks for mAEWing2
  • We’ll investigate times / days for our regular meetings starting in late January, in preparation for spring semester

Status Updates

  • mAEWing1
    • Conducted bandwidth and rate limit testing on Hitec 9360TH and Futaba S9251 servos. Found the 3 dB bandwidth to be about 6 Hz for the Hitec and 14 Hz for the Futaba servo. The rate limit of the Hitec servo was found to be about 955 degrees per second and the rate limit of the Futaba servo, running at 6 volts, was found to be 1267.5 degrees per second. Working on cleaning up report and will upload data and report to the University of Minnesota’s Digital Conservancy as well as update the bandwidth figures given in the mAEWing1 git repository.
    • While standard servos operate at a framerate of 50 Hz, we would like to operate at 100 Hz for mAEWing1. The Futaba S9251 servo is a helicopter tail rotor servo, which operates with its gyro at a framerate of 333 Hz, so this servo should be fine for operating at 100 Hz. The Futaba S9251 is no longer produced, but the Futaba S9256 appears to be its direct replacement, which we have one on-hand. We will conduct bandwidth and rate limit testing on the Futaba S9256. We’re also planning on conducting a short trade study in early January to pick a few servos to test before making final selections for mAEWing1. We’ll then purchase and characterize the servos for this aircraft.
    • STI will be looking at additional / higher modes for MIDAAS.
    • Dave S. finishing up his working paper explaining the ILAF concept and conducting some minor tuning on the control law (i.e. trying to achieve more high frequency rolloff for torsion).
  • mAEWing2
    • Target a 12 ft wingspan scale of the X-56A Outer-Mold Line (OML).
    • UMN starting to investigate some modifications to in-house VLM software to investigate drag changes due to twist for mAEWing2 MDAO effort.
    • VT also starting induced drag investigation with in-house software.
    • Will compare induced drag / twist investigation results between UMN and VT in early spring to validate approaches.
  • Tools
    • UMN uploaded a new version of the FEM code to the git repository.