4 ms·
Do they all have the same kit? There are a lot of homebrew ones out there using stuff like windshield wiper motors hooked to off the shelf control circuitry [1
by Ccecil 3y ago
Do they all have the same kit?
There are a lot of homebrew ones out there using stuff like windshield wiper motors hooked to off the shelf control circuitry [1]. It "functions" but has anyone looked into the effects? Doesn't hurt to see if there is a correlation.
The video below is an example. It also has rudder feedback...so that very easily could cause an oscillating signal. Which would also vary in pitch as the rudder was hit by the Orca.
I know I can hear PWM'ed stepper motors...and many younger people complain about them. I wonder what that sounds like to an animal which uses sonar and can hear different ranges.
[1] https://youtu.be/-nA6wo9PXls?t=5 https://youtu.be/-nA6wo9PXls?t=5
- tejtm 3y agohmm I wonder if it could be something as simple as a "leafblower" effect with the non-analog mechanical seeking. Testable by decoupling the drive and or damping the rudder.
- Ccecil 3y agoCan you explain this more? Or link some stuff explaining more...would like to understand what you mean exactly.
- tejtm 3y agocan try, basically a motor-sensor loop can "hold position" by noticing when it has gone past some threshold then corrects in the opposite direction ... rinse and repeat. Some systems may have thresholds that cause the rudder to "quiver" while staying on course, To an intelligent creature exquisitely sensitive to things quivering in the water this could be a major annoyance. the main types of motors likely used in this application are Servos and Steppers https://en.wikipedia.org/wiki/Servomotor https://en.wikipedia.org/wiki/Servomotor https://en.wikipedia.org/wiki/Stepper_motor https://en.wikipedia.org/wiki/Stepper_motor Here is a page that describes the behavior and calls it "hunting" https://www.motioncontroltips.com/what-is-hunting-in-the-context-of-motion-control-and-how-is-it-addressed/ https://www.motioncontroltips.com/what-is-hunting-in-the-con... But we are far afield from what I know, so apologies to the EEs and Robotasists for my gross simplifications.
- Ccecil 3y agoThat was what I thought you meant. And yeah that was pretty much exactly what I was thinking. If the current was pushing against the rudder in waves it would also make a rhythmic pitch change that went along with the water movement. If the whales hit the rudder it makes a "whine"...which is what an animal might do as well.