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Overview of Status of Analysis, Design, Fabrication, Tests, etc.
A size on the float has been determined. The preliminary design and measurements of the float have been completed. We will wait until next quarter to begin fabrication and testing.
Accomplishments from Previous Week
Calculated error of velocity curve based on error of sensor measurements
σ m2= σ y2Sxx where Sxx = i=1N(xi - x )2 =(i=1Nxi2)-1N[i=1Nxi]2 where xi =i*dt
Where i=1Nxi2=N(N+1)(2N+1)6 dt 2 (the sum of the squares of the first N consecutive integers)
And 1N[i=1Nxi]2 = 1N[N(N+1) 2dt]2 (the square of the sum of the first N consecutive integers divided by N)
Thus Sxx= N 3-N12dt 2
Thus σ m2= σ y2Sxx = 12 σ y2(N 3-N)dt 2 = 12 σ y2N 3dt 2 for N large
Substituting “T/N” for “dt” and taking the square root of both sides yields
σ m = 12N σyT
This is the Standard Deviation of the slope for a least squares line, given Standard Deviation of position, y
For N large. Or for the particular problem at hand, the standard deviation of terminal velocity, given the
vendor supplied accuracy of the depth sensor.
For the Star Odi sensor, sigma for depth = 0.049-ft
If T = 2 seconds N = 20
Using the above equation, sigma for velocity = 1220 0.049 ft2 sec = 0.019 ft/sec
σ vel = 0.019-ft/sec
Tilt Angle Analysis
Determined Individual Component Analysis
Alan : Cable behavior underwater through current
Harry: Tilt angle effect on the velocity reading
Tung: Hydrodynamic performance of fins underwater
Aaron: Star Oddi Sensor
Kendra: Sensor housing
Goals for Next Week
Complete final presentation
SolidWorks model of the float
FBD to determine coefficients of the initial float
Sponsor Comments from Meeting
The sponsor brought the sensors for the team
Decided that the salinity is assumed constant
Determined that the velocity float is necessary to record deceleration of the cart after the drive float stops
Action Items
Find a reasonable equation to solve the buoyancy range of drive float, geometry of float, mass & geometry of cart
Calculate tilt vs buoyancy for various currents (0-1kt)
Instructor Comments from Meeting
Need to discuss with the sponsor to determine what we will assume to be constant.
Many variables can affect the float and therefore there are many sources of error
Risks and Areas of Concern
We need to find a testing facility that will allow us to properly test the float when it is ready for a full run.
Resources or Information Required but not Available
Some information is not available from Spawar since the project has not been fully built.
Some information cannot be shared due to NDA
Schedule
Next big milestone is to complete the individual analysis components and purchase materials for the first float build.
Budget
Amount spent: $0
A materials list will be compiled once a meeting with Mark Gillcrist has been completed and he approves the first design
Progress on Report and Webpage
Webpage will be updated shortly. Preparing for final presentation currently
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