Overview of Status of Analysis, Design, Fabrication, Tests, etc.
CAD is up-to-date, drag coefficient determined.
all major components came in (manufacturer sent wrong outer clamps for mounting thrusters)
Assembly in progress
Team has clearer understanding of goals for the code and its structure
Custom machining in progress
Accomplishments from Previous Week
Consulted with Parker O-Ring Manual and got the right dimensions for piston and o-rings for dynamic reciprocating seal
Finished fabricating piston with correct tolerances (need minor adjustment because of inaccuracy of technical drawing of linear actuator from manufacturer).
Updated Solidworks CFD, got drag coefficient of system
First draft of report written out.
made new battery holders (because manufacturer gave wrong dimensions for batteries) and tested connections
Successfully ran thrusters with firmware
exchanged linear actuator for 4 inch stroke
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Update battery analysis to plot total battery life time against duty cycle of thrusters/linear actuator (Doris)
Drill holes in the wedding cake plates for mounting linear actuator and have rods threaded so they are assembly ready (Duncan)
Finish structure of code (fine tune PID later) and interface sensors (Hugo, Michael)
dynamic simulation of dive depth vs time, incorporating system compression, buoyant force, drag, weight, thrust. (Zach)
Linear actuator sleeve flange design and CAD for stabilization (Zach)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
During testing stage, test for minimal-energy averaging period. Long average period may lead to further drift from neutral and needs more energy to adjust (5/9, in person)
Noted for testing stage
Don't have to make separate fail-safe system for current project, do leave room for it. (5/9, in person)
for now, just add section in the code for full extension of piston for emergency surface conditions while blasting thrusters.
Instead of leak sensor, consider humidity sensor (5/9, in person)
noted, looking into humidity sensors
Main goal of project: minimum on time of thrusters/linear actuator to establish stability (5/9, in person)
add to dynamic model as input parameters.
Analysis is not as useful as actual experiments and hardware testing (too many uncertainties for model to provide useful information, especially regarding compression)
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
Do more analysis and give reasons as to why we chose one number vs the other (5/3, in person)
noted, will tidy up matlab code and incorporate into report.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
What sort of fail safe system will be used? (5/3 in person)
no longer a part of the project that needs to be considered.
Risks and Areas of Concern
Coding PID for actuator and thrusters and making system stable.
Must be extremely careful with machining parts because budgets do not allow for buying a lot of replacement components.
Resources or Information Required but not Available
Schedule
All parts that need to be machined should be done (assembly-ready) by Wednesday of week 7.
Pool test week 8 with assembled system
Update Gantt chart.
Budget (list amount spent and amount remaining)
Spent: $1750.31
Remaining: $249.69
Progress on Report and Webpage
Report 1st draft done (needs to update with current analysis)
Website up-to-date