p14414 p3 arborloo wind resistance test stand detailed design review
DESCRIPTION
P14414 P3 Arborloo wind resistance test stand Detailed Design Review. Greg Hyde Raymond Zheng Joseph Rojano Katie Bentley Lori Liebman. Overview. Team Introductions Project Statement Functional Decomposition System Architecture Concepts Project Refocusing CFD Analysis - PowerPoint PPT PresentationTRANSCRIPT
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Greg HydeRaymond ZhengJoseph RojanoKatie BentleyLori Liebman
P14414P3 ARBORLOO WIND RESISTANCE TEST
STANDDETAILED DESIGN REVIEW
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Team Introductions Project Statement Functional Decomposition System Architecture Concepts Project Refocusing CFD Analysis ANSYS Analysis
Subsystems Risk Analysis Project Plan Moving Forward Summary
OVERVIEW
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TEAM INTRODUCTIONSMember Major RoleGreg Hyde Industrial
EngineerProject Manager
Raymond Zheng
Mechanical Engineer
Lead Engineer
Joseph Rojano
Mechanical Engineer
Secretary
Katie Bentley
Mechanical Engineer
Engineer
Lori Liebman Mechanical Engineer
Engineer
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• Measure wind speed, forces, aerodynamic effects
• Create test procedure for full size and scale testing
• Recommendations for future design of arborloos
PROJECT STATEMENTThe primary objective of this project is to design a scale model and a full-size test stand that will help determine
the wind resistance of various arborloo designs. The scale model test stand should replicate the forces experienced by a Class I hurricane, and the results should be easily
comparable to the lower speed, full-size results.
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FUNCTIONAL DECOMPOSITION Compare hurricane
resistance of arborloo designs
Mimic Hurricane Use/ Create a test plan
Acquire Data(deflection,pressure,
temp,etc.)Secure Environment Stop TestStart Test
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FUNCTIONAL DECOMPOSITION Mimic Hurricane
Hit model with Debris
Accept debris into test system Release DebrisAdjust Relative
SpeedAdjust Model Size
Find Coefficient of Drag(Cd)
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FUNCTIONAL DECOMPOSITION Acquire Data
(deflection,pressure,temp,etc.)
Attach Measuring Devices Take Measurements Record Device
OutputsStore Device
Outputs
Measure Flow(rate) Measure Forces Measure Time
Power Measuring Devices
Calibrate Measuring Devices
Attach directly to model
Use wires to connect to DAQ
device DAQ Data Processing
System
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FUNCTIONAL DECOMPOSITION Secure Environment
Provide Safe/Secure Area
Secure Arborloo to Test Stand
Stop Debris form Leaving Area
Secure Test Stand to Test location
Provide Mounting Mechanism Ensure Stability Prevent Debris from
falling off model
Stop Debris from entering wind
tunnels key components
Secure to wind tunnel
Provide mounting block
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PROCESS MAPSelect
Arborloo design to be
tested
Secure Arborloo into
test stand
Calibrate Measuring
Devices
Start Collection of Relevant
data
Subject Test Stand and Arborloo to
testing environment
Check Test Conditions to
make sure hurricane conditions
Run Test End Test
Stop subjecting test stand and Arborloo to test
conditions
Stop Collecting Data
Are there more designs to test Yes
NoAnalyze Data and Compare
Designs
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SYSTEM ARCHITECTURE
Test Stand
Fluid Monitoring
Measuring Devices
Control Unit/Data Storage
Safety Measures
Power Supply Fluid Control
Human
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CONCEPTS - RIT WIND TUNNELScale Speeds – 1/6 Model
Matching Reynolds Number• Required Wind Tunnel fluid
speed: ~570 mph• Wind tunnel maximum fluid
speed: ~120 mph• Using a model that’s 1/6th as
small,Mimicked wind speed: ~20 mph
• ~40 mph for a 1/3 model
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CONCEPTS - TOW TANK HYBRID 1/6 Scale
• Required velocity of the system to be ~17.5m/s
• Drag force would be ~11455.6 N
• Required motor would need to be ~250hp
1/3 Scale
• Required velocity of the system to be ~8.75 m/s
• Drag force would be ~12124N
• Required motor would need to be ~140hp• If v = 40mph,
Vreq = 7.36m/s Fd = 2145N Preq = ~21hp
• Maximum testable wind speeds would be around 50mph with a 30hp engine assuming 2m/s lazy river velocity
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SCALING LAWS
• Dimensional Analysis – allows for identification of key parameters
• Reynolds Number allows to determine model test velocity given a full size expected velocity
• Drag Coefficient allows us to find the expected full size drag force given the model measured drag force
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• CD(Re) – Large Difference Laminar & Turbulent Flows
• To make sure you have dynamic similitude you need to match Reynolds between model and full size so that CD is correct
REYNOLDS NUMBER - IMPORTANCE
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• For infinite plate with 2D flow, CD is actually constant over a vast range of Re
• Can assume CD will always be constant at any velocity
REYNOLDS NUMBER - IMPORTANCE
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DRAG COEFFICIENT- IMPORTANCE
“The drag coefficient for all objects with sharp edges is essentially independent of Reynolds number (for Re>1000)”
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• Because CD is constant for a flat plate at a large range of Reynolds Numbers, there is no need to match wind speed
• No need to match Reynolds Number
• Can obtain CD with low speed tests
• With a constant wind velocity, area and fluid, the drag force can be calculated given CD
PROJECT REFOCUSING
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• Created a simulation using COMSOL Multiphysics 4.3b• Turbulent Flow Parameters• Flow Characteristics• Pressure Distribution• 3 Models• 22-45 mins simulation time
CFD ANALYSIS
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CFD ANALYSISTOP OF ARBORLOO
1/6 MODEL AT 95 MPH
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CFD ANALYSISTOP OF ARBORLOO
1/6 MODEL AT 570 MPH
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CFD ANALYSISMIDDLE OF ARBORLOO
1/6 MODEL AT 95 MPH
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CFD ANALYSISMIDDLE OF ARBORLOO
1/6 MODEL AT 570 MPH
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CFD ANALYSISBOTTOM OF ARBORLOO
1/6 MODEL AT 95 MPH
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CFD ANALYSISBOTTOM OF ARBORLOO
1/6 MODEL AT 570 MPH
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CFD ANALYSISPRESSURE DISTRIBUTION OVER
FACE OF ARBORLOO1/6 MODEL AT
95 MPH
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CFD ANALYSISPRESSURE DISTRIBUTION OVER
FACE OF ARBORLOO1/6 MODEL AT
570 MPH
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• Mechanical Deformation• SOLID 187 • Wood – E=9.03 GPA• Anisotropic Material• 1 inch thickness
ANSYS ANALYSIS
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• Measuring Devices
• DAQ + Data Processing
• Attachments + Model
SUBSYSTEMS
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• Pressure Sensors (Omega PXCPC-001GV )– 5 sensors mounted on face of arborloo– Sensor range 1 kPa – 1000 kPa– Cost: $31 each
SUBSYSTEMS – MEASURING DEVICES
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• Pressure sensors will give general pressure distribution• Surface area of arborloo face is known
– 1/6 scale: Area=18 in^2 • Average Pressure x Area = Distributed Force
SUBSYSTEMS – MEASURING DEVICES
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• Anemometer– 1 mounted next to arborloo (not obstructing air flow)– Cost: ~$250 each– Used to verify windspeed at arborloo
SUBSYSTEMS – MEASURING DEVICES
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• 2 options for Data acquisition and processing – Option 1: Real time analysis using
LabView• Department equipment available to
convert information from sensors to LabView compatible data
• LabView code would analyze the data instantaneously
– Option 2: External Storage and analysis using LabView, Excel or Matlab• Device can have an external storage that
can be connected to a computer than analyzed in any program that the user desires
• Data must be collected after each test and has a limit on data capacity
SUBSYSTEMS – DAQ + DATA PROCESSING• NI LabView
• National Instruments program that the KGCOE has available for students
• Provides tools that are needed to build measurement and control applications efficiently
• An application can be made to analyze the data as it is being collected and projecting it in a useful format
• Matlab or Excel• Data would be input manually after
being stored on an external drive• Then data would be analyzed using
the program applications
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• RIT Wind Tunnel• Model to be attached via stainless steel plate• Test Model will need to be about 1.5 ft tall max (1/6th
scale)
SUBSYSTEMS – ATTACHMENTS + MODEL
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• Wind Tunnel Attachment Block
• ¼” thru holes for attachment
• Create adaptor that attaches to the block to simulate the posts of the arborloo in the ground
SUBSYSTEMS – ATTACHMENTS + MODEL
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SUBSYSTEMS – ATTACHMENTS + MODEL
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RISK ANALYSIS
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RISK ANALYSIS
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PROJECT PLAN
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Weeks 13-15• Test Small Scale in Wind
Tunnel• Design Full Scale Test
Weeks 9-12• Finalize Small Scale Design• Purchase Materials• Build Model
MOVING FORWARD
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OVERVIEW Team Introductions Project Statement Functional Decomposition System Architecture Concepts Project Refocusing CFD Analysis ANSYS Analysis
Subsystems Risk Analysis Project Plan Moving Forward
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QUESTIONS?