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From: Adam Chapman on 8 Jun 2010 14:03
Hi,

Im having trouble getting a hydraulic motor to turn in simulink. I've
uploaded an image of my model to http://i268.photobucket.com/albums/jj10/quibo/simulinkpicture.jpg

Ive set up a step pressure input equal to the motor's nominal
pressure. The pressure scope "Pa" recieves this input, the pressure
scope "Pb" stays at zero throughout the simulation (which I suppose is
ok since it's a pressure difference I need to get the motor turning).
However, the motor shows no angular movement durnig the whole
simulation.

What on earth could be wrong with it?
From: Adam Chapman on 8 Jun 2010 14:42
On Jun 8, 7:03 pm, Adam Chapman <adamchapman1...(a)hotmail.co.uk> wrote:
> Hi,
>
> Im having trouble getting a hydraulic motor to turn in simulink. I've
> uploaded an image of my model tohttp://i268.photobucket.com/albums/jj10/quibo/simulinkpicture.jpg
>
> Ive set up a step pressure input equal to the motor's nominal
> pressure. The pressure scope "Pa" recieves this input, the pressure
> scope "Pb" stays at zero throughout the simulation (which I suppose is
> ok since it's a pressure difference I need to get the motor turning).
> However, the motor shows no angular movement durnig the whole
> simulation.
>
> What on earth could be wrong with it?

OK I've done some more playing and have got an angular rotation
measurement on my scope. However to do this I had to add a damper
between the first rotational reference and the rotation sensor.

I guess the damper I added it imposing a delay on the rotation signal.
However, what I actually want to do is have the scope show the angle
through which the motor shaft has turned during the simulation. I
suppose the same effect as setting this damper torque to infinity.

Is there a reference block that constantly stays at zero?
From: Adam Chapman on 8 Jun 2010 18:37
On Jun 8, 7:42 pm, Adam Chapman <adamchapman1...(a)hotmail.co.uk> wrote:
> On Jun 8, 7:03 pm, Adam Chapman <adamchapman1...(a)hotmail.co.uk> wrote:
>
> > Hi,
>
> > Im having trouble getting a hydraulic motor to turn in simulink. I've
> > uploaded an image of my model tohttp://i268.photobucket.com/albums/jj10/quibo/simulinkpicture.jpg
>
> > Ive set up a step pressure input equal to the motor's nominal
> > pressure. The pressure scope "Pa" recieves this input, the pressure
> > scope "Pb" stays at zero throughout the simulation (which I suppose is
> > ok since it's a pressure difference I need to get the motor turning).
> > However, the motor shows no angular movement durnig the whole
> > simulation.
>
> > What on earth could be wrong with it?
>
> OK I've done some more playing and have got an angular rotation
> measurement on my scope. However to do this I had to add a damper
> between the first rotational reference and the rotation sensor.
>
> I guess the damper I added it imposing a delay on the rotation signal.
> However, what I actually want to do is have the scope show the angle
> through which the motor shaft has turned during the simulation. I
> suppose the same effect as setting this damper torque to infinity.
>
> Is there a reference block that constantly stays at zero?

OK I figured it out. For anyone who needs to know, just add an inertia
block. instead of that damper
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