Determining Vehicle Speed From An Audio Recording, 2 hours with Alan Moore

DATE: Friday, 16 February 2024
TIME: 12 noon - 2 pm EDT (GMT-4)
COST: Free for NAPARS member;  $5 for non-members
LOCATION: Worldwide Via Zoom
ACTAR: This event has been submitted by ACTAR for CEU consideration (signing in with i-Attend during the show will be required, so get i-Attend on your phone in advance, per the ACTAR info page here: https://actar.org/ceu/earning)
Registered attendees will be able to request an attendance certificate during the show.

SUMMARY:
Video evidence is becoming more prevalent every day, and methods to determine vehicle speed from video are well developed. However, In some cases the video analysis methods are not applicable, but sufficient audio data is available to do the job. How can a reconstructionist analyze the noise of a vehicle to determine its speed? Learn how engine design, vibrations theory, the Fourier transform, and gearing can help you find the speed from what sounds like random noise.

What will participants learn?
    Basics of extracting frequency information from vehicle noise
    How engine frequency is related to vehicle speed
    How to handle torque converter slip
    Advantages and limitations of the method
    How to apply the method in practical examples

Alan says an SAE paper is in the works, and we are excited to be able to share this with our members and the crash analysis community!