20230531 Design Review with Jesus

Weight savings

With the removal of this material from the design we reduce the weight of the enclosure by almost half from 12.078 lbs to 7.8763125 lbs

Saw that we could utilize a penetrator with a larger inner diameter if concerned about the cables not fitting within the penetrator

Current penetrator modeled in is for a 4.5 mm diameter I'D. We can utilize a 8mm I'D penetrator if we are concerned for space 

Cable clearance with the penetrator with a 8mm ID 

Alternate placement of the DVL placement to save on the wire lengths for for connecting up to the dvl

Talked about the combining the battery clamps to fit the clamps in between the thrusters but not need to make the frame wider for the thrusters to integrate well. However the battery tubes will will be below the thrusters.

Check design against the design guide. Holes for mounting of the enclosure plate are 0.109 in diameter and 0.5 inch depth. 

Threaded portion is 0.25 inches which is slightly larger than the guideline of length < 2*1.09 guideline.

20230524 Power Considerations DVL enclosure

12 and 28 VDC 3A 

Wire sizing chart here

Calculator here

Can remove the extra material t o reduce the thickness of the wall

0.669 in thickness of the wall for the penetrators

Looking back the above assumptions that that thread

Not ideal configuration with the ports upward as the water from the enclosure and end cap can drip down into the enclosure

20230529

Layout of battery tubes in addition to the dvl enclosure at the bottom of the frame. Notice how the vertical thrusters are slightly obscured by the battery tubes

20230523 Test Fitting Design

 

Dovetail designs were implemented into the design to enable manufacturing on the 256 mm x 256 mm by 256 mm build volume of Bambu-X1 Carbons.

After clamping together pieces for top surface flush

Test fitting the electronics within the enclosure. All of the electronics fit the wire bend radius have been verified

20230515 Initial Mock Ups of Custom Enclosure for DVL

 

Received loan of Teledyne RD Instruments Explorer OEM version. (without the enclosure)

Simple version 

Goal of this version is to reduce manufacturing costs but limiting the number of setups and operations required to produce the final part.

Link to CAD here

Top view: 

Side View: 

Front View: 

ISO view: 

Bottom view: 

Bottom Detailed view of DVL bore hole: 

Widest standard I'D for o rings is 25.94

Desired o-ring

The dimension for the groove is slightly larger than the inner diameter of the o ring

Suggested stretch 25.94  + (25.94 * 0.05) = 27.237

Needed stretch 7.5%

25.94  + (25.94 * 0.0753) = 27.893282

Note I did the previous calculation wrong, I got the inner circumference of the o-ring, I did not divide by PI for the diameter. This seems to be a more reasonable size 

There are quite a few options of o-ring diameters which inner diameters are compatible with the more reasonable sizing.

Alternate Version

Objective of this version would be to approach the DVL enclosure design with existing hardware. Additionally designing with live turning in mind to explore if there was an easier to manufacture approach than a deep trough enclosure design. 

Link to cad here

Laying Out DVL potential placements 

The size of the existing dvl enclosure at the bottom of the sub. 

Side view/ Note the enclosure can be moved slightly back to enable an unobscured view from the bottom facing camera

Proposed packaging with the battery tubes close to the main enclosure to interface with the downward facing DVL enclosure. Note, would need to rework the enclosure clamping system

Second option of placing the batteries below the dvl enclosure. Note the batteries is lower down on the sub which would lead to a more stable sub. 

Views of custom DVL enclosure with batteries. Significantly less total volume needed to package within the sub enclosure.

Alternate design mounted. Note this is a very large design that would require a redesign of the frame and mounting additional ballast to counteract the volume of water displaced with this design.