4 ms·
I wonder when active damping systems will come to washing machines. You'll need sensors to measure vibrations, a control unit and some small but fast actuator c
by diroussel 9y ago
I wonder when active damping systems will come to washing machines. You'll need sensors to measure vibrations, a control unit and some small but fast actuator coupled to a small counter weight.
The technology shouldn't be much different to the noise cancelling earphones I'm wearing right now. But with a larger actuator.
- ynniv 9y agoMy current LG washer spins the drum at startup to detect balance and load, so it probably accomplishes some active balancing by modulating the drive motor during the spin cycle. This one still has a regular concrete balance though.
- taneq 9y agoSame, but I figured it was doing something more like: int speed = 0, retries = 0; for (int time = 0; time < SPIN_LENGTH; time++) { speed += speed < MAX_SPEED ? 1 : 0; if (read_shake_sensor() > TOO_MUCH_SHAKING) { time = speed = 0; if (++retries > MAX_RETRIES) break; } set_spin_speed(speed); sleep(1); }
- ynniv 9y agoWhile it's possible that it is this simple, spinning the drum back and forth to detect load shows a significantly more advanced understanding of control theory.
- joezydeco 9y agoI have an LG and noticed that it takes a very measured approach to spin cycles, as if it's taking a bunch of measurements at certain speeds before going into the high speed final spin. It can also reverse the drum to try and loosen loads that have fixed together in one lump. That has to be a huge advantage of the direct drive system and most likely something that concrete-filled belt-driven UK banger can't do.
- quickben 9y agoTake the vibration amplitude over time in all three directions. Take first and second derivative per axis. Send that to something mechanical to counter it.
- lathiat 9y agoMy 1400rpm Samsung front loader definitely does. Probably the higher spin speeds make it more necessary?