Aircraft Wing Structural Dynamics
45
Aircraft Wing Structural Dynamics UCSD
description
Aircraft Wing Structural Dynamics. UCSD. Agenda . What is Research Project information Overview Lab Culture Theoretical Methods Experimental Methods Cost and Budgets Literature Survey . Our experience with an Aircraft Wing and structural Dynamics applying the research method - PowerPoint PPT Presentation
Transcript of Aircraft Wing Structural Dynamics
Aircraft Wing Structural Dynamics
UCSD
Agenda What is Research Project information Overview Lab Culture Theoretical Methods Experimental Methods Cost and Budgets Literature Survey
Our experience with an Aircraft Wing and structural Dynamics applying the research method
Conclusion
“Research is seeking through methodical processes to add to one’s own body of knowledge and, hopefully, to that of others by the discovery of non trivial facts and insites”
What is Research?
-Michelle Lowe of Beginning Research: A guide for foundation degree students
Scientific MethodState the Problem
Research About Topic
Hypothesis
Test with an
Experiment
Analyze and draw a conclusion
Report Results!
Think again!
Hypothesis is true
Hypothesis is partially true
or false
Come up with a topic to be researched
Research a subject you enjoy
Process for Conducting Research
Ask the journalistic questions who, what, when, where, why and how.
These questions provide the foundation of why the research is important.
Develop a Question
Answers to your previous questions will serve as your thesis statement.
Your thesis will be the driving force behind your research
Create Answers to your questions
Significance Thesis statement and
answers to previous questions will give the research significance.
It will serve to note if research is original work or if others have already investigated the subject.
Goals Set goals or make blueprint to actual
experimentation.
Setting goals measures 1) Dependent and independent Variables 2) What exactly will be measured 3) What relationships will be examined
Project Information Project Location: University of California,
San Diego. UCSD design lab (Aerospace Engineering). Principal Investigator: Tom Hung.
Project Goal: Measuring the strength of a Balsa Wing Structure subject to a Uniform Distributive Load.
Measured the strength of a Balsa Wing Structure by applying point load, force (sandbags) while having structure secured to a test stand.
Project Overview
4 different wings were made, each one differed by the amount of materials it was made of.
Each wing was put under the same amount of force.
Project Overview
To build stiffer wings that can hold more weight.
Information gained: Which built wing is the most effective according to its stiffness to test on a wind tunnel.
This experiment was made in a micro scale and with balsa wood and other light materials.
This also can be applied to real life, with real wings and alternate compound materials.
Industry cares and will benefit from this experiment.
Project Overview
This research is important because it is a micro scale testing of the strength of a wing structure.
The beneficiaries of the research are:1)Federal Aviation Administration (FAA)2)National Transportation Safety Board (NTSB)3)General Public
Abstract Overview
Lab Culture
All laboratory operations contain elements of danger
General Laboratory Safety Rules No food or drinks
allow in the laboratory
Smoking is prohibited
No open toe shoes
General Laboratory Rules (Cont) Use appropriate eye
protection Be familiar with the
lab Learn and know what
to do in case of an emergency
Unauthorized person(s) shall not be allowed in the lab
Laboratories shall remain locked other than office hours
Never open (remove cover) of any equipment in the labs
Report all problems to staff in charge
In case of emergency, Campus security may be called
General Laboratory Rules (Cont)
Lab Project Teamwork Individual Task Time management Results/conclusion
Theory explains 1) Equations that
will be used. 2)The physics
behind the issue. 3)If the theory is
testable.
Theory: A proposed explanation whose status is still speculative and subject to experimentation.
Theoretical Methods
Beam Theory : Provides a mean of calculating the load-carrying and deflection characteristic of beams
Beam: Horizontal of Vertical structure capable of withstanding load by resisting bending.
Deflection: Degree under which a structural element is displaced under a load(force)
Theoretical Methods
Beam Theory Equation: d^2y/dx^2 = M(x)/EI
Under this experiment we assume that the wings behave as beams.
Theoretical Methods (Continued)
At the Tip Deflection Formula: Y=PL^3/3EL
Theoretical Methods (Continued)
Point Load Formula: y=P/6EI (-x^3+3L^2x-2L^3) A point load is a load which is located to a
specific location on a structure.
Theoretical Methods (Continued)
Uniform Distributive Load: y=-w(x^4-4L^3x+3L^3)/24EI Uniform Distribution: When the load w per
unit length has a constant value over part of the beam
Theoretical Methods
Putting theory into practice
Plan of action for experiment – how will you get that data.
Takes into consideration time and costs.
Experimental Methods
Experiment Materials Balsa Wood Glue Exacto Knife Test Stand (Beam) Plastic cover
Experimental Methods Dependable Variables:• Christian• Michelle• Manny• Ivan
Controlled Variable:• Ribs• Wings• Chord Length • Spars • Leading edge• Some air fall
All have 3in. Ribs All wings are 2 ft. Chord Length 2 Sets of spars Same air fall
Controlled Variable
How we worked…
Our Wings !
AT UCSD…
Costs and Budgets This Research Academy was made possible by:
NASA California Space Grant Consortium
Experiment Cost:
$110.00dlssStaff Salary
Literature SurveyGeneral Subjects Airfoils and lifts
Forces and moments
Beams in bending
Cantilever of beams and
wings
Ground effect on flow past a wing with a NACA0015 cross section
Experimental Thermal and Fluid Science, Volume 40, July 2012, Pages 18-28 (S.C. Luo, Y.S. Chen)
Wing Ground Effect (WIG)
It generally increases lift while decreasing drag
Test in a wind tunnel
What is lift? Wings counter act gravity by creating lift! Bernoulli’s principle states that as velocity
goes up, pressure goes down Wing design, wing tips!
Literature Survey
Data Analysis
2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.10
0.1
0.2
0.3
0.4
0.5
0.6
0.7Flexural Stiffness (EI) vs. Weight (W)
MichelleChristianMannyIvan
Weight (ounces)
Flex
ural
Stiff
ness
(EI
=lb
s*in
^2)
Tip Deflection
0 0.2 0.4 0.6 0.8 1 1.20
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
f(x) = 0.494938132733408 x − 0.00787401574803183
f(x) = 0.654460478685517 x − 0.0296861126559924f(x) = 0.563962961878836 x − 0.00200021465718311
f(x) = 0.406629004088244 x + 0.00729346564021513
Tip Deflection vs. Tip Load
christianIvanLinear (Ivan)MichelleLinear (Michelle)MannyLinear (Manny)ChristianLinear (Christian)
Tip Load (lbs)
Tip
Defl
ectio
n (in
ches
)
Collecting Data
Conclusion
Q AND A
San Diego State University Scholarships in Science, Technology, Engineering, and Mathematics (S-STEM) Program Web: www.csrc.sdsu.edu/s-stem.html Contact: Prof. Satchi Venkataraman at [email protected] Minority Access to Research Careers (MARC) Web: www.sci.sdsu.edu/casa/marc/index.php Contact: Thelma Chavez at [email protected] Minority Biomedical Research Support (MBRS) Web: sci.sdsu.edu/imsd/ Contact: Michelle Lopez at [email protected] McNair Scholars Program Web: www.sci.sdsu.edu/mcnair/index.htm Contact: [email protected] University of California San Diego Doris A. Howell Foundation Research Scholarship Web: aep.ucsd.edu/?action=scholarships Contact: David Artis at [email protected] Portal to Various Research Programs – aep.ucsd.edu/?action=programs students.ucsd.edu/academics/research/undergraduate-research/opportunities/index.html University of San Diego Portal to Various Research Programs – www.sandiego.edu/ugresearch/students/on_campus/ www.sandiego.edu/academics/research_and_scholarship/undergrad_research.php
Research Opportunities
Team Work!
