P18351: Sandia Passive Vacuum Detection Team A
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Detailed Design

Table of Contents

Team Vision for Detailed Design Phase

Team NAMASTe planned to complete all assigned deliverables including finalizing the design.

All of the assigned deliverables were successfully completed. In addition, preliminary vacuum testing has been completed in order to verify the validity of the diaphragm concept. A vibration resistant switch has been chosen for the final design. Vibration testing facilities have also been acquired for testing in the second semester. Parts for machining the final design are to be ordered and submitted for completion by the end of the semester.

Progress Report

Items accomplished since last review:

ITW 16-404 snap action switch 10A @ 28VDC Adheres to MIL-PRF-8805/7 Temperature: -65 to 125 C Vibration: 10-2000Hz Designed mounting brackets

Items to still be accomplished by detailed design review

Decisions that have been made so far

Beyond the review

Questions

Vibration profile

Prototyping, Engineering Analysis, Simulation

A prototype was developed in order to characterize a variety of diaphragm materials to determine which material would be the most suitable for our application. The flanges were 3D printed and epoxied onto a chamber constructed from PVC piping. The mounting brackets for the chamber were also 3D printed. The elevation platform was constructed in order to hold the assembly off of the bottom of the vacuum chamber so that the dial indicator could be effectively utilized to determine maximum diaphragm deflection.

Prototype Flange Assembly

Prototype Flange Assembly

Prototype with Elevation Platform

Prototype with Elevation Platform

Prototype with Elevation Platform

Prototype with Elevation Platform

Bill of Material (BOM)/Purchasing

Assembly Exploded View

Assembly Exploded View

Final Build BOM

Final Build BOM

Purchases

Purchases

Test Plans

Pressure Deflection Test Questions to be answered by test
  1. How much deformation do we get from the diaphragm?
  2. How well does the diaphragm return to its original state?

Procedure

Set Up

Diaphragm Template Set-up

Diaphragm Template Set-up

Diaphragm Test Set-up

Diaphragm Test Set-up

Dial Indicator Set-up

Dial Indicator Set-up

Vibration Testing

Questions to be answered by test

  1. Does vibration play a role in false actuation of the switch
  2. Does vibration cause deformation in the diaphragm
  3. If yes to 2, does this change as the chamber becomes pressurized

Procedure

Testing procedure and administration to be handled by Delphi.

Drawings, Schematics

Mechanical drawings of the assembly components can be found in the document linked below.

Design and Flowcharts

3D Model Isometric View

3D Model Isometric View

3D Model Isometric View

3D Model Isometric View

Switch Assembly

Switch Assembly

3D Model with Maximum Profile

3D Model with Maximum Profile

3D Model with Maximum Profile

3D Model with Maximum Profile

3D Model with Maximum Profile

3D Model with Maximum Profile

Wireframe Front View

Wireframe Front View

Wireframe Right Side View

Wireframe Right Side View

Wire Frame Top View

Wire Frame Top View

Risk Assessment

Risks

Risks

Design Review Materials

Slides for Detailed Design Review held on 12/12/2017.

Plans for next phase

Team NAMASTe plans to have all design plans finalized and submitted to the machine shop for manufacturing before break. This way, upon return, the next phase may continue immediately with testing of the final design.
Preliminary MSDII Schedule

Preliminary MSDII Schedule


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