The Deliverable of P16371 MSD TeamIt'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 TasksFor the subsystem level design phase, our team expected to accomplish the following tasks:
- Identify and solicit support from specific faculty members.
- Refine any requirements and/or functions as necessary.
- Create a functional decomposition for each subsystem.
- Generate specific feasibility analyses.
- Demonstrate feasibility for subsystems.
- Demonstrate proof of concept for each subsystem.
- Conduct preliminary engineering analyses for each subsystem.
- Bake more goodies and gain a few pounds from aforementioned goodies.
- Work off a few pounds by participating in a group bonding bike ride.
Accomplished TasksThe following tasks were actually accomplished during the subsystem level design phase:
- Spoke with Dr. Lam about dampening the oscillations of a speaker.
- Solicited support from John Wellin with LabVIEW.
- Identified and addressed Dr. Kandlikar's feedback from the design level review presentation.
- Refined engineering requirements.
- Refined customer requirements.
- Refined house to quality in order to reflect changes in the engineering and customer requirements.
- Identified specific tasks associated with each subsystem.
- Purchased multiple speakers to perform feasibility testing with.
- Conducted preliminary feasibility testing with speakers.
- Identified a method to adjust meniscus height by utilizing vehicle brake lines.
- Gained some weight from delicious, unhealthy cookies.
Feedback from System Level Design ReviewThere were a number of valuable observations and recommendations during the system level design review presentation. The major points of feedback are as follows:
- Incorporate a feedback loop into the customer requirements.
- Research the frequency range and amplitude of speakers.
- Begin speaker testing at lowest possible frequencies.
- Put speaker in line with the needle, and place the syringe pump perpendicular to the system.
- Use a stage to adjust the meniscus height.
- Ensure the project work is evenly distributed among team members.
- Consider LED lights over a halogen light.
- The syringe pump can be decoupled from the system via a flexible, non-pliable line.
- Consider the backlash of the syringe pump.
- There are many resources available at RIT for LabVIEW.
- Consider writing a paper and presenting it at an ASME conference.
A detailed summary of the feedback from the system level design review can veiwed by clicking here.
Updated Customer Requirements
An Excel Worksheet containing the updated customer requirements can be accessed by clicking here.
Updated Engineering Requirements
An Excel Worksheet containing the updated engineering requirements can be accessed by clicking here.
Updated Schematic of the System
Speaker Proof-of-Concept & Feasibility
|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.|
Height Adjustment Preliminary TestingThe 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.
A PDF of the feasibility testing plan can be viewed by clicking here.
Current Bill of MaterialsPresently, we have spent $39.77 of our $5,000 budget.
|2.5" round speaker from Jameco Electronics||$6.09|
|6.5" round speaker from MCM Audio||$33.68|
Subject Matter ExpertsAt 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 PhaseFor the next three weeks, our team plans to complete the following tasks:
- Complete speaker feasibility testing so that feasibility of the remaining subsystems can be demonstrated.
- Create detailed drawings and schematics as appropriate.
- Follow-up with subject matter experts.
- Demonstrate proof of concept for subsystems.
- Develop a detailed test plan for each engineering requirement.
- Begin developing a bill of materials.
- Continue risk mitigation.
- Identify areas that we need further help with.
- Participate in group bonding bike ride despite the cold weather.