P16371: Controlled Oscillating Meniscus Test Fixture
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Preliminary Detailed Design

Table of Contents

The Deliverable of P16371 MSD Team

It's expected that this MSD team designs and constructs a device that is capable of meeting the customer requirements as outlined in the problem definition. Specifically, this means that the device must create a stable liquid meniscus, oscillate the meniscus at a frequency of approximately 100 Hz, be capable of utilizing multiple different working fluids, be able to interface with the other subsystems, and it must be reliable. In order to fulfill the customer requirements, it's also expected that the MSD team designs a computer program that allows for adequate control of the device. Therefore, upon completion of MSD II the customer will receive a device that meets his requirements along with a program that is capable of supplying the necessary controls. It's the customer's desire that the device which is being designed and constructed by this MSD team will enable him to conduct his doctoral research.

Team Vision for Preliminary Detailed Design Phase

Anticipated Tasks

For the preliminary detailed design phase, our team expected to accomplish the following tasks:

Accomplished Tasks

The following tasks were actually accomplished during the preliminary detailed design phase:
Yummy! Yummy!

Yummy! Yummy!

Feedback from Subystems Level Design Review

The following list provides the major feedback point provided during the previous subsystems level design review presentation. For a full description of the feedback click here.

Customer & Engineering Requirements

Customer Requirements

Customer requirements

Customer requirements

An Excel Worksheet containing the updated customer requirements can be accessed by clicking here.

Engineering Requirements

Engineering requirements

Engineering requirements

An Excel Worksheet containing the updated engineering requirements can be accessed by clicking here.

Subsystems Status

Fluid Injection

Fluid injection status

Fluid injection status

Capacitance Sensor

Capacitance sensor status

Capacitance sensor status

Visibility

Visibility status

Visibility status

PID & LabVIEW

PID and LabVIEW status

PID and LabVIEW status

Height Adjustment

Height adjustment status

Height adjustment status

Oscillator

Oscillator status

Oscillator status

Drawings, Schematics, & Videos

Videos

To view a video clip of an oscillating meniscus utilizing the current design setup click here.

To view a video clip demonstrating feasibility of the capacitance sensor click here.

Small Speaker Enclosure Design

Initial design of small speaker enclosure

Initial design of small speaker enclosure

Final design of small speaker enclosure

Final design of small speaker enclosure

Exploded veiw of final design of small speaker enclosure

Exploded veiw of final design of small speaker enclosure

Drawing of small speaker enclosure with 15 degree internal cone angle

Drawing of small speaker enclosure with 15 degree internal cone angle

Drawing of small speaker enclosure with 30 degree internal cone angle

Drawing of small speaker enclosure with 30 degree internal cone angle

Drawing of small speaker enclosure with 45 degree internal cone angle

Drawing of small speaker enclosure with 45 degree internal cone angle

Image of fabricated aluminum small speaker enclosure

Image of fabricated aluminum small speaker enclosure

Image of fabricated aluminum small speaker enclosure

Image of fabricated aluminum small speaker enclosure

Small speaker design drawing Link to PDF document
15 degree angle Click here.
30 degree angle Click here.
45 degree angle Click here.

Large Speaker Enclosure Design

Initial design of large speaker enclosure

Initial design of large speaker enclosure

Final design of large speaker enclosure

Final design of large speaker enclosure

Final design of large speaker enclosure

Final design of large speaker enclosure

Drawing of large speaker enclosure with 15 degree internal cone angle

Drawing of large speaker enclosure with 15 degree internal cone angle

Drawing of large speaker enclosure with 30 degree internal cone angle

Drawing of large speaker enclosure with 30 degree internal cone angle

Drawing of large speaker enclosure with 45 degree internal cone angle

Drawing of large speaker enclosure with 45 degree internal cone angle

Large speaker design drawing Link to PDF document
15 degree angle Click here.
30 degree angle Click here.
45 degree angle Click here.

Evaporation Tests

Evaporation testing conclusions

Evaporation testing conclusions

For the detailed test records and results click here.

Based on the evaporation test results, it was determined that the current syringe pump will be capable of providing an adequate flow rate that is capable of accounting for the evaporation of the liquid meniscus on the heated copper plate. This was concluded by comparing the test results to the published capabilities of the syringe pump. The specifications for the current syringe pump can be found by clicking here.

Feasibility plan

Feasibility testing plan.

Feasibility testing plan.

A PDF of the feasibility testing plan can be viewed by clicking here.

System Schematic

Updated system schematic

Updated system schematic

Current Bill of Materials

Presently, we have spent $322.87 of our $5,000 budget.
Item Price
2.5" round speaker from Jameco Electronics $6.09
6.5" round speaker from MCM Audio $33.68
6061 Aluminum round rods $249.37
Brake hose $15.97
Teflon PTFE 0.01" gasket material $17.76
TOTAL $322.87

Subject Matter Experts

During the current phase, our MSD team spoke with Dr. Lam regarding speaker frequency, damping, and amplitude. We learned that any damping present in the oscillating meniscus system will not affect the frequency of the oscillations. In response to this, our team created a mantra, "Frequency in equals frequency out." Additionally, Dr. Lam analyzed two proposed speaker enclosure designs. She deemed one design more practical and effective than the other, due to the effects of damping; the chosen speaker enclosure design has minimal damping. Finally, Dr. Lam suggested that a less elongated internal cone angle would result in less damping because there would be less air; however, it was suggested to test various angles.

Design Review Materials

Item Link to document
Project readiness package Click here.
Team norms Click here.
Subystems design feedback Click here.
Preliminary detailed design presentation Click here.
Preliminary detailed design presentation audio Click here.
Preliminary detailed design presentation feedback Click here.

Plans for Next Phase

For the next three weeks, our team plans to complete the following tasks:

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