## Dynamic rot. speed if collision

## Dynamic rot. speed if collision

(OP)

Hello fellow Adams/View users!

Adams gives me headaches. First of all: sorry for my grammatical errors.

The problem I seek your help with is the following: I need to simulation a fricion wheel drive. In order to keep the model simple lets say there are only two friction wheels (wheel 1 and wheel 2) and one long rigid body which has to be moved by the wheels. First B has a contact only with wheel W1. Both wheels accelerate by an implied motion, so that B is being moved to W2; there will probably be slip, which is OK.

But now there is a problem. When the moved body hits wheel 2,

The function I used to apply the motions is the Step function. I do realise that this funcion is the cause for the trouble. But how else is one supposed to accelerate the system.

I actually had the idea to calculate the braking the relationship: Δv = a *Δt together with F

While F

The so calculated Δv is then divided by the radius of the friction wheel in order to get Δω, wich is then subtracted from the Step-function, so I`d get :

Ang. vel = STEP (time, 0, 0, 5, 30) - IF( IMPACT: 0, 0, Impact/m_body)*dt/r

My problem at this point is to determine dt. I`m pretty sure this entire approach is a total mess, but I couldn`t figure out how else

I hope it`s comprehensible what I`m trying to say.

Thanks a lot in advance!

PS: the friction wheels are supposed to be driven by a motor, of which I do have a Torque-speed-characterisitics. But my goal is to accelerate the system in a given time, so I used a motion instead of a sforce.

Adams gives me headaches. First of all: sorry for my grammatical errors.

The problem I seek your help with is the following: I need to simulation a fricion wheel drive. In order to keep the model simple lets say there are only two friction wheels (wheel 1 and wheel 2) and one long rigid body which has to be moved by the wheels. First B has a contact only with wheel W1. Both wheels accelerate by an implied motion, so that B is being moved to W2; there will probably be slip, which is OK.

But now there is a problem. When the moved body hits wheel 2,

**wheel 2 SHOULD get braked a bit because of the impact**; then accelerate to its old angular velocity, but because of the motion it does not lose any speed.The function I used to apply the motions is the Step function. I do realise that this funcion is the cause for the trouble. But how else is one supposed to accelerate the system.

I actually had the idea to calculate the braking the relationship: Δv = a *Δt together with F

_{N}= m*a.While F

_{N}= value of the Impact-value and m = mass of the rigid body.The so calculated Δv is then divided by the radius of the friction wheel in order to get Δω, wich is then subtracted from the Step-function, so I`d get :

Ang. vel = STEP (time, 0, 0, 5, 30) - IF( IMPACT: 0, 0, Impact/m_body)*dt/r

My problem at this point is to determine dt. I`m pretty sure this entire approach is a total mess, but I couldn`t figure out how else

**to make the ang. velocity dynamic once it has reached its end value of 30**at the time point of 5 sec.I hope it`s comprehensible what I`m trying to say.

Thanks a lot in advance!

PS: the friction wheels are supposed to be driven by a motor, of which I do have a Torque-speed-characterisitics. But my goal is to accelerate the system in a given time, so I used a motion instead of a sforce.