Stand Concept Generation & Selection
Table of Contents
Step 1. Clarify The Problem
To design/build a stand that will unite the M.E. Dyno Lab Test fixture and the required Briggs & Stratton Model 20, 10hp engine with regards to the following parameters.
- Ability to tilt engine from -30 degrees to +30 degrees
- Easy to set-up and take down
- Adaptive to future changes
- Affordable, relatively easy to build
- Wont limit sensor locations
- Withstand vibrations and handle engine running up to 4500rpm
- Be Safe
Step 2. Search Externally
We were unable to find any good resources on similar projects related to small engine dynamometers. Much of what we did come across was in regards to purchasing or building a completely new system, not retro-fitting an existing system, so the external search wasn't much help. It was brought to our attention that Michigan Baja SAE does do dyno testing, so we will attempt to contact them to gain insight.
Step 3. Search Internally
The picture below shows an example of the work performed in our group meetings when trying to establish several creative concepts.
Step 4. Explore Systematically
After our group established several stand concepts, we recorded the best seven and then compared them in a Pugh's matrix form to narrow down our selection. This is shown below:
- The team decided all stand concepts should allow for the customer requirement of being able to tilt the engine, while simultaneously offering the capacity to keep the engine drive shaft in the same location in order to reduce complexities in our future drive-line.
- The Bolt pattern concept was iterated, improving it's score by moving the plate from between the two sides to on top of the sides; this would assist in holding the engine weight during adjustment making it more user friendly.
- The solid sides with bolt pattern and the solid sides with slots became the two lead concepts mostly due to cost and stability.
- These two concepts guided us toward the hybrid, a cleaver mixture of bolt pattern and slot which in the end scored best.
From here we honed in on the top three stand concepts and took a deeper look by weighing our section criteria:
Next, under the direction of T.A. Bill Nowak we redid the same matrix using our winner as the baseline to see if our results would remain the same. In this case they did, the hybrid stand concept The hybrid design that incorporates the positives of the other two designs continued to be the winner.
Step 5. Results of the Process
To see the stand Feasibility, please follow this link: Engineering Analysis
Step 6. Make ImprovementsBelow shows the final assembly of the stand. Iterations of the design process makes for improvement as seen below:
Step 7. Finalize & Order
Step 8. Build
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