Not my video but got me wonder what causes the tub to hit the sides of the machine. I noticed this keeps happening on newer machines.
Tub banging sides- what causes it?
- Thread starter Chetlaham
- Start date
phillymatt53
Well-known member
POS!
henene4
Well-known member
Floating tub suspensions are usually paired with higher speed spins.
They are (probably) somewhat cheaper than other suspension designs, but from a purely engineering standpoint, low vibration at high spin speeds is the goal.
With an unbalanced load spinning, the tub is constantly changing direction.
A change in direction always means a kind of acceleration (not in the "go faster" sense, but in the physics sense).
As the tub spins slow, there is more time of the tub traveling in the same approximate direction.
As it speeds up, there is less time for the tub to travel in that direction.
The mass of the tub stays the same.
Force is mass times acceleration.
That means that at lower speed, the force is less (the tub has more time to change direction, so acceleration is less) but the tub has a lot of time to travel in a general direction.
That means the amplitude if travel is larger.
If an OOB system isn't fast enough to respond, that can lead to the tub hitting the cabinet.
However, at higher speeds, the tub has to change direction quicker - acceleration goes up.
That means force goes up.
BUT at some point the tub is changing direction so fast it simply has no time to travel enough into a specific direction to make contact with the cabinet.
Now, on the cabinet side, any force transmitted into it makes the cabinet move a bit. Any force always requires equal opposite force, and that opposite force results in movement in the cabinet.
And movement in the cabinet is vibration which is generally a big source of noise during high speed spins.
(You'll see the cabinet, despite being very "thin" does not move much.)
So, if the suspension is "soft" (aka low resistance) any force on the cabinet side can only get so big. Thus, vibration stays low.
And when forces get high (high spin speeds) you need to limit any force as much as possible.
The most extreme example is commercial hard mount washers.
You can just not have any movement at all. But the forces have to go somewhere. And that's a massive concrete slab in that case.
You can create very high spin speed machines that way aswell (see Milnor) - but why should you?
These TLs are the opposite - they use basically maximum movement. That allows to get very high spin speed with minimal opposite force.
But the danger is that maximum movement leads to "physical interference" - aka collision between tub and cabinet.
That should in theory be offset by OOB sensing - but that has it's limits as well...
They are (probably) somewhat cheaper than other suspension designs, but from a purely engineering standpoint, low vibration at high spin speeds is the goal.
With an unbalanced load spinning, the tub is constantly changing direction.
A change in direction always means a kind of acceleration (not in the "go faster" sense, but in the physics sense).
As the tub spins slow, there is more time of the tub traveling in the same approximate direction.
As it speeds up, there is less time for the tub to travel in that direction.
The mass of the tub stays the same.
Force is mass times acceleration.
That means that at lower speed, the force is less (the tub has more time to change direction, so acceleration is less) but the tub has a lot of time to travel in a general direction.
That means the amplitude if travel is larger.
If an OOB system isn't fast enough to respond, that can lead to the tub hitting the cabinet.
However, at higher speeds, the tub has to change direction quicker - acceleration goes up.
That means force goes up.
BUT at some point the tub is changing direction so fast it simply has no time to travel enough into a specific direction to make contact with the cabinet.
Now, on the cabinet side, any force transmitted into it makes the cabinet move a bit. Any force always requires equal opposite force, and that opposite force results in movement in the cabinet.
And movement in the cabinet is vibration which is generally a big source of noise during high speed spins.
(You'll see the cabinet, despite being very "thin" does not move much.)
So, if the suspension is "soft" (aka low resistance) any force on the cabinet side can only get so big. Thus, vibration stays low.
And when forces get high (high spin speeds) you need to limit any force as much as possible.
The most extreme example is commercial hard mount washers.
You can just not have any movement at all. But the forces have to go somewhere. And that's a massive concrete slab in that case.
You can create very high spin speed machines that way aswell (see Milnor) - but why should you?
These TLs are the opposite - they use basically maximum movement. That allows to get very high spin speed with minimal opposite force.
But the danger is that maximum movement leads to "physical interference" - aka collision between tub and cabinet.
That should in theory be offset by OOB sensing - but that has it's limits as well...
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