Buoyancy Analysis Inputs:
Buoyancy Mechanical Design • Johnson Electric Motor (12 V) – – • Alexander Engel Gear Set – • Aluminum Machined in-house ID x OD x thickness: 2” x 2. 25” x 0. 125” Batteries – – • Aluminum Machined in-house Cylinder – – – • 6 mm Piston Head – – • Proven for piston systems Threaded Piston Rod – • High rpm (16, 000 rpm@12 V) Lightweight (7. 50 oz per motor) 4 Dura. Trax Receiver Ni. Cd Flat Pack 6 Volt 2200 m. Ah (600 m. Ah required per motor) Length x Width x Height: 3 -1/4“ x 1 -3/4“ x 5/8" Weight: 4. 8 oz Sealing – – Precision Associates Inc. Piston Head Seal • – 75 -1. 840 1. 84” ID x 0. 075” C/S x 2. 0” OD End Cap Seal • 25 -237 0. 237” ID x 0. 025” C/S x. 287” OD
Buoyancy Electrical Design • Ballast Tank switch (BTS-II) – Proven system for remote submarines – Electronic (no servos) – Connects directly to Receiver • Stop-full micro switch • Stop-empty micro switch • Trim switch
Buoyancy Test Plan • • Static Motor Strength Test (Feb 7 th) Verify System Produces force to operate at a depth of 20 m – – – • • Buoyancy Subsystem Test (Never Achieved) Verify descent and ascent rate – – – • • Horizontal Load Cell • Resolution: 1 lb • Range: 50 lb – 400 lb • Accuracy: +/- 1 lb Expected Results: 141 lb force Results: 11 lb force (Error due to incorrect moment arm calculation) Antenna Marking w/ Stopwatch • Range: 0 – 6 ft • Resolution: 0. 5 ft Expected Results: 3. 0 ft/sec Minimum Requirement: 0. 5 ft/sec Overall System Test (Never Achieved) Verify system remains neutrally buoyant at given depth – – – PX 236 Pressure Transducer • Range: 0 – 60 psi • Bandwidth: 2 Hz • Resolution: 0. 1 psi • Accuracy: +/- 1. 5% Expected Results: 3. 0 ft/sec with neutral buoyancy (< 0. 2 psi change) Minimum Requirement: 0. 5 ft/sec with 1 minute neutral buoyancy [1]
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