P12361: ME Lab Hardware/public/
Table of Contents
Documents for Detailed Design Review 2/24/2012
- Our main objective is to gain your approval of the
designed system and move forward into manufacturing and
- A range of masses have been selected for use in the pendulum experiment to ensure variability. To get a larger diameter, and a higher mass, both a 3" diameter steel and 3" diameter aluminum mass have been chosen. The cost and accessibility of this size sphere are making this a poor mass choice. What relatively available and inexpensive materials of comparable weight and diameter could be used?
- Will the components of the centripetal acceleration apparatus for the centripetal acceleration experiment be easily manufactured (to be addressed when assembly shown and explained)?
- Does the current centripetal acceleration apparatus have a high functionality (to be addressed when assembly shown)?
- What diameter hole should be used in order to press fit the bearings for the centripetal acceleration apparatus (to be addressed when drawing shown)?
- What are your suggestions for a power supply that can support the encoder (5V DC, 30 mA draw) and the DC motor (needs to draw both 1V, 80 mA and 6V, 80 mA)?
- Is it ok if our chosen camera gives us an error greater than 3% between the captured motion and the actual motion?
Feasibility / Engineering Analysis
Centripetal Acceleration Experiment
Detailed DesignDrawing Package
Free Fall Procedure ASTM Samples
Bill of Material (BOM)
MSD II Timeline
Detailed Design Review Notes
- Kempski - What is the dynamic viscosity loss in the shaft encoder?
- Dr. Hensel - instead of moving the mass along the rod vertically, why not move the rod itself and the vertical rod will act as a counterbalance. Need to do calculations to determine if it would contribute to less error and better theoretical results. Since it is closer to the axis, it might reduce the impact.
- Wellin - follow up Zach
- Need to check if the data is going to be usable with the Ultrasonic sensor. Both sensors can be used for the experiments. However, for experiments that more accuracy is needed, use ultrasonic sensor and for the slower experiments, could use the IR sensor
- Kempski - Need to test to ensure that when receiving, sensors are not receiving signals from other transmitters resulting in misrepresented data
- Sarah - Take into account the range of both sensors when comparing
- Landschoot - Maybe can include holes in the horizontal arm in CP experiment, to ensure common parts.
- Dr. Hensel - Reducing part count is a key concern for the lab because parts are very easily misplaced
- Dr. Hensel - the clearance between bottom of the pulley and the slider plate, suggested to increase clearance to allow room for assembly
- Dr. Hensel - the goal of the CP experiment is to demonstrate that the magnitude of the acceleration remains same but the direction continues to change.
- Wellin - Why don’t we measure the tension in the rod so it can be correlated to the centripetal acceleration?
- Landschoot - From a measurable, observable standpoint, can we get data on the movement of the car?
- A downward looking video camera could help overcome this challenge.
- Dr. Hensel - Measuring force is a difficult concept to introduce in the first year so it is better not to measure tension in the rod to calculate centripetal acceleration. Since they are already familiar with using the video camera, it would be a much easier transition for the students also
- Kempski - Need to account for the stand of the camera for both experiments taking into account safety and hazards that might take class to reduce risks of damage
- Wellin, Kempski - Need to calculate torque requirements to bring the arm up to speed?
- Kempski - Safety is a key concern with the CP experiment. The car attached to the end of the arm should in no situation, come off while in motion. One potential method is to include a transparent casing around which allows students to see the experiment while it is being conducted but also provide a safety aspect
- Dr. Hensel - Can the entire vertical post be tilted? (John to follow up and understand benefits, goals etc)
- Landschoot - 8020 suggests screws over bolts for attachments
- Hathaway - Could include a protractor at the hinge to not only know the angle that it is set at but also to ensure when it is at zero
- Kempski - Need to take a physical measurement just to ensure that data output from sensor is reliable. So, both physical measurement + sensor data will be used
- Landschoot - maybe we could include an LED light on the car for the roller coaster experiment
- Landschoot - The casing for the foam could be a frame made of thin Aluminum rods to allow for easy replacement of the foam but at the same time not requiring
- Kempski - Trying to minimize the impulse force by increasing time to compress the time, need to transfer the change in linear momentum to minimize force transmitted to reduce risks of wear/tear/damage to sensor/fasteners and masses dropped
- Robustness of the Centripetal Acceleration housing design
- Video logging software capability in data output and accuracy with linear motion
- Hathaway - Using release of string to drop ball than releasing directly with hand
- Roller coaster experiment – the loop, flexibility, real life component
- Calculations for moving the vertical rod (pendulum) along pivot shaft instead of moving the mass along the rod vertically.
- Add to test plan – Kempski’s idea
(Katelyn will be following up with Kempski to get more
- Experiment could be added for a different class or an additional experiment for the same class
- Professor Landschoot might be involved for this experiment also
- Verify height of apparatus w/#samples to be collected. Sensor calculations using height of 1.71m and actual height of apparatus (from floor) is 1.57m
- Have to do video logging software testing on the curvilinear experiment
- Need to meet with Dr. Hensel and others to determine how to remove the colon delimiters so that the data output is recognized to be in numeric format in Excel and students can make frame to frame velocity calculations and plot a graph
- Need to consider horizontal arm (CPAcc) to be with holes for adjustable length
- Design a holder/case and stand for the camera
- Need to accommodate video camera logging software for the centripetal acceleration experiment as well
- Do sufficient testing to determine if additional supports for the vertical post are required