I've done some quick google search on dynosheet, and what it does is that it measures the power output of the car with respect to its frequency.
My initial understanding of the dynosheet is that it reads the output in horsepower(power) and its frequency space is in the unit of rpm, which checks out because you want the unit to be proportional to [time]^-1. or radian/time.
I'm not sure if it's logical to think that since a car has 5-6 gears (unless if it's an electric motor car, but even if it's a DC motor of one gear, it'll still apply), it'll have different responses for each gear. Assuming each gear will produce a result similar to a low pass filter (which isn't impossible since low pass filter is just a concept that not only could be applied to frequency but also wavelength), is the purpose of having multiple gears merely a way to compromise for the lack of efficiency due it's dampening effect in the high frequency? At the higher frequencies of each gear, the dynosheet reading is negatively steep almost as if it's a cliff.
I guess if the above reasonably checks out, I'm just wondering if it's logical to say that I can do a fourier transform on the car's dynosheet, or if the dynosheet is already by itself a fourier transform, since the power is a function of its angular frequency P(Ω)/P(Ω=0). Normalized or not, I find the mathematics to be somewhat convincing for me to believe that that could be/ is the case, but verification is appreciated.
I've read some papers from searching on google that people actually use Fourier Transform spectroscopy to analyze the emission of certain gases, as well as using dynanometer to measure the tangential force of a wheel running at a certain angular frequency. I would guess that my initial idea is not too far off from real world applications...?
Like I said before, it's nice when someone can confirm!