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August 23, 2006

Moments of Inertia�

Uninhabited Aerial Vehicle (UAV) �Dryden Remotely Operated Integrated Drone (DROID) �

Presented by Helida C. Haro�August 5, 2010

https://ntrs.nasa.gov/search.jsp?R=20110008320 2019-12-30T06:59:59+00:00Z

Agenda

  Personal Background   Research

  Importance   Measure, Weight, CG   Design Hardware and Test   Machining   Hangar   Safety Mitigations   Critical Design Review (CDR)   Tech Brief   Test   Analyze Data

  Lessons Learned   Future Plans   Questions

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Personal Background

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  CSUN Applied Mathematics Master Student

  CA Mathematics Council Member

  CSUN Mathematics Club Member

  National Science Foundation Scholarship Recipient

  NASA Intern

Research

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Mass Properties

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Themasspropertiesofanobjectaresimplytheproportionalityconstantsbetweenappliedforceandtheresultingacceleration:

ThisisNewton’s2ndlawfor1DegreeofFreedom(DOF)translationandrotation,respectively

Whenexpandedto6DOF:CGinformation

InertiaTensorMass

6DOFforce 6DOF

acceleration

Importance

The inertial characteristics have direct consequences on:

Aerodynamics Propulsion Structures Control

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Measure and Weight

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Design

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Manufacturing

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Shuttle Hangar

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Safety

  Human Hazard Analysis   Loss of Asset/Mission Hazard Analysis

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Approvals

  Critical Design Review (CDR)   Tech Brief

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Testing

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Data Analysis

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  Time Constraints   Basic Geometric Shapes   MATLAB   Error

Lessons Learned

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  Dryden vs. Disneyland   Learning   Team Effort   Double check all work   Stress Testing   Use steel instead of aluminum

Future Plans

  GSRP at NASA Headquarters   Graduate   Work for NASA

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Questions?

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Mark, Chris, Aaron, Lesli, Stephanie, Alex, and Helida All photos provided by: NASA photographer, Thomas P. Tschida and INSPIRE Team

UAVSAR Longitudinal Center of Gravity and Yaw Inertia TRR & CLR 18 of 10

BACK-UP: Inertia Calculations

Where, I = Yaw Mass Moment of Inertia, [lb-in2] g = gravity, [in/sec2] d = Distance Between Cables, [in] l = Cable Length, [in] T = Period of Oscillation, [sec] W = Weight, [lb]

Reference: NACA TN No.351

Pod

l

Rig

d