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From: Arnaud Miege on 25 Jun 2010 12:25
"Lallaey khan" <sidh.sinha(a)yahoo.com> wrote in message <hor953$skr$1(a)fred.mathworks.com>...
> Hi,
>
> I have modelled a vary basic hydraulic circuit. A variable displacement pump is pumping fluid from a hydraulic reference block into a gas charged accumulator. The pump is set at 100 percent efficient. the problem is that I have used to find the accumulator initial volume from the equation for the accumulator block by setting up a precharge pressure of 90 bar and an initial pressure of 100 bar. Now, in theory, if I put this initial fluid volume value back into the same equation and calculate the initial pressure, it should come up to be 100 bar, but after the simulation run, I am not getting 100 bar but different values for different accumulator capacities. Can anyone help me why this is happening?
>
> Thanks,
> Lalley Khan

You might want to replace your vdp by an ideal hydraulic pressure source so that you know excatly what pressure is going inot your accumulator. Note that the volume depends on the accumulator capacity if the inlet pressure is greater than the precharge pressure. Could you also post your model or at least a snapshot of it somewhere?

Thanks,

Arnaud
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