Spring 2021 Results

The angled rail system initiated by the 2019-2020 team was finalized this semester. This included mounting an 80-20 track to the frame and adding tubing to allow for varying angles. The configuration and design for the compression spring at the top of the frame in conjunction with an electromagnet was determined. A modeled base attachment piece for a Hybrid III headform was successfully attached to the carriage via plate that allows additional headform models to be tested at varying orientations. The orientation of the electromagnet by a bracket was finalized and allowed the carriage housing the modeled headform attachment to be released from the compression spring. The carriage successfully traveled down the track to allow the attachment piece to be released. The attachment piece was released from the solenoid when a push button was pressed.

For the next iteration of this project, a Hybrid III headform should be tested on the frame and electronically released onto a complaint surface. Spring displacement was calculated to determine the force needed to propel the attachment piece at a 9° and 30° incline but was not tested. These calculations should be used to determine the amount of manual hand cranks needed to produce 6 m/s. Displacement calculations can be found in Appendix II. The team proposed a wiring diagram for the relay, solenoid, and LiDAR sensor where the solenoid will communicate with the LiDAR sensor and will retract its extension rod when 6 m/s is reached. The team produced potential codes for the relay and LiDAR sensor but did not test the code. The team was unable to incorporate the LiDAR sensor into the system since mechanical and structural aspects of this project took precedent. The team had to design additional parts for the frame and had to undergo training on select machines to construct parts. The team also had to be trained in welding in order to mount the additional parts. Appendices IV and VI show the proposed wire diagram and code for the entire system. Acceleration data should also be acquired by incorporating a Slam Stick inside of the Hybrid III headform. The Slam Stick needs to be configured and calibrated to acquire impact data using the Slam Stick software. This includes determining sampling frequency, sampling rate, and frequency of the low pass filter. A delay interval is needed for recording data when the headform meets the compliant surface. Data gathered from the Slam Stick should be used to determine position of impact, impact acceleration, and Head Injury Criterion for each trial. Appendix III displays the equation needed to calculate Head Injury Criterion.

To view the team's poster, design report, and design package, select the images or titles to be directed to another page or to the team's Google Drive.