P16371: Controlled Oscillating Meniscus Test Fixture
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Subsystem 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 Subsystem Level Design Phase

Anticipated Tasks

For the subsystem level design phase, our team expected to accomplish the following tasks:

Accomplished Tasks

The following tasks were actually accomplished during the subsystem level design phase:

Feedback from System Level Design Review

There were a number of valuable observations and recommendations during the system level design review presentation. The major points of feedback are as follows:

A detailed summary of the feedback from the system level design review can veiwed by clicking here.

Updated Customer Requirements

Customer requirements

Customer requirements

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

Updated Engineering Requirements

Customer requirements

Customer requirements

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

Updated Schematic of the System

Updated system schematic

Updated system schematic

Speaker Proof-of-Concept & Feasibility

Images

Image of the 6.5

Image of the 6.5" MCM Audio speaker.

Image of the 6.5

Image of the 6.5" MCM Audio speaker with water.

Image of the 6.5

Image of the 6.5" MCM Audio speaker with water.

Image of the 2.5

Image of the 2.5" Jameco Electronics speaker with water.

Image of the digital amplifier used to drive the speakers.

Image of the digital amplifier used to drive the speakers.

Videos

Video description Link to audio and video
Initial 6.5" speaker test Click here.
6.5" speaker from 50Hz to 12kHz Click here.
2.5" speaker at 1kHz Click here.
2.5" speaker from 10kHz to 100kHz Click here.
Shake It Off Click here.
Sail Click here.
Interstellar Click here.

Height Adjustment Preliminary Testing

The first image shown below is of an adjustable stage that was found in the lab. This stage offers relatively fine adjustment, yet requires the fabrication of a base so that it can be firmly mounted to the system and isolation table. The second image shown below is of a set of brake lines. It's anticipated that these brake lines will be utilized in order to enable the needle to move. These brake lines can withstand pressures in excess of 3,000psi, so it's certain that they will not dampen the vibrations induced by the speaker.
Image of an adjustable stage.

Image of an adjustable stage.

Image of brake lines that will enable height adjustment.

Image of brake lines that will enable height adjustment.

Subsystem Tasks

Ownership

Subsystem Owner
Fluid injection Charles
Capacitance sensor Joe
PID/LabVIEW Rob
Visibility All
Height adjustment Rob
Oscillator Alyssa

Fluid Injection

Fluid injection tasks.

Fluid injection tasks.

Capacitance Sensor

Capacitance sensor tasks.

Capacitance sensor tasks.

PID/LabVIEW

PID and LabVIEW tasks.

PID and LabVIEW tasks.

Visibility

Visibility tasks.

Visibility tasks.

Height Adjustment

Height adjustment tasks.

Height adjustment tasks.

Oscillator

Oscillator tasks.

Oscillator tasks.

Feasibility plan

Feasibility testing plan.

Feasibility testing plan.

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

Current Bill of Materials

Presently, we have spent $39.77 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
TOTAL $39.77

Subject Matter Experts

At the present state, we have spoken with Dr. Marca Lam and John Wellin. Dr. Lam was consulted in order to explore the possibility of dampening speaker vibrations. It was concluded that the speaker vibrations could not be dampened; however, she recommended that we wear ear plugs while testing the speakers. Furthermore, Dr. Lam mentioned that we should expect noise in our graph while collecting data as a result of EM interference from the lights; we can implement a filter to reduce this noise. John Wellin was consulted in order to ascertain his willingness to assist with LabVIEW at the appropriate time; he was more than willing to offer his help.

Design Review Materials

Item Link to document
Project readiness package Click here.
Initial customer interview Click here.
Team norms Click here.
System design feedback Click here.
Subsystem level design presentation Click here.
Subsystem presentation audio Click here.
Subsystem 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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