this post was submitted on 16 May 2024
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Dyson gets shit on frequently for being overpriced, but the audible analysis they do one some of their products is crazy complex. Some years ago I watched 30 minute video on the design they did for the hair dryer where they were designing minute angles in the fins of the air impeller, and using a PWM algorithm to measure backpressure in a feed back loop to spin up the fan where it wouldn't create loud noise while also increasing the volume of air moved. They tuned the mechanisms specifically to shave off tiny peaks in oscilloscope readings.
One thing I remember is that they said they couldn't entirely eliminate the specific annoying sound frequencies because it had to ramp, but what they did is ramp to right below the annoying sound frequency level, then hold, then burst above the annoying frequency band very quickly. So the operator of the unit doesn't hear the annoying sound because the device shoots past it so fast.
I've never heard of any company be that picky and put so much effort into avoiding one negative experience of a product.
And then they go and make an idiotic bathroom hand air dryer that is vertical and unnatural to dip hands into and too small of an opening so as to be difficult to not touch it with your clean hands.
That came way before the hair dryer, no?