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Buoyancy Analysis

Buoyancy Analysis. Inputs:. Buoyancy Mechanical Design. Johnson Electric Motor (12V) High rpm (16,000 rpm@12V) Lightweight (7.50 oz per motor) Alexander Engel Gear Set Proven for piston systems Threaded Piston Rod 6 mm Piston Head Aluminum Machined in-house Cylinder Aluminum

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Buoyancy Analysis

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  1. Buoyancy Analysis Inputs:

  2. Buoyancy Mechanical Design • Johnson Electric Motor (12V) • High rpm (16,000 rpm@12V) • Lightweight (7.50 oz per motor) • Alexander Engel Gear Set • Proven for piston systems • Threaded Piston Rod • 6 mm • Piston Head • Aluminum • Machined in-house • Cylinder • Aluminum • Machined in-house • ID x OD x thickness: 2” x 2.25” x 0.125” • Batteries • 4 DuraTrax Receiver NiCd Flat Pack 6 Volt • 2200mAh (600mAh 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

  3. 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

  4. Buoyancy Test Plan • Static Motor Strength Test (Feb 7th) • Verify System Produces force to operate at a depth of 20m • 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) • Buoyancy Subsystem Test (Never Achieved) • Verify descent and ascent rate • 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 • PX236 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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