I am currently studying DSP and FFT, I am very new to this and have been doing electronics for a long time with Arduino and hobby projects. Recently, I am doing a project with the goal to map potholes along your daily commute in the car, measuring road roughness. This is not the road profile, but the subjected roughness of the ride the driver feels during the trip. I have an acceleration mounted to measure Z-axis "vertical" acceleration of the car, when a pothole is struck the shocks and springs dampen the force as per the quarter car model for simplicity.
Basically I want to be able to create a detector that will detect potholes by using FFT to find the dominating frequency of the vertical acceleration, then I can maybe match it to pattern to detect door slamming of the car door, or a man-hole cover from a pothole maybe in the future.
I'm not sure if FFT is the way to go, any input or advice and ideas are greatly appreciated, I have made a low pass filter to filter out the higher frequency vibration from the drive train and engine.
Any ideas on the subjected "roughness" felt by the passengers/driver in the car? I was thinking of doing road tests on a smooth road, gravel road, brick road, bad road, and coming up with a threshold of the magnitude of the vertical acceleration and making a scale somehow on what is considered "rough"
The potholes detected would be also logged with GPS their locations, I'm trying to use the Rasberry Pi for this, with data storage and its speed as a good project for it.
Thanks any help or ideas is appreciated, books, tutorials, wisdom, etc
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