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From: Lallaey khan on 18 Feb 2010 07:31
Hi,

Can any body tell me what is meant by the initial volume parameter for the Gas charged accumulator in simhydraulics? Can it be considered as the precharged volume of the fluid that has to be remain in the accumulator for all times or is it a different thing? For example, If the accumulator capacity is 10 litres, then whole of this 10 litres cannnot be used in calculation, instead some portion of this capacity will always be occupied by some amount of fluid all the time in order to prevent the bladder to be sucked out when the accumulator is discharging. So the "initial volume" parameter is this this portion of fluid or something else? and how to calcualate the value of that portion of fluid?

I will highly appreciate any response.
thanks,

From: Arnaud Miege on 18 Feb 2010 08:02

"Lallaey khan" <sidh.sinha(a)yahoo.com> wrote in message
news:hljbua$jmk$1(a)fred.mathworks.com...
> Hi,
>
> Can any body tell me what is meant by the initial volume parameter for the
> Gas charged accumulator in simhydraulics? Can it be considered as the
> precharged volume of the fluid that has to be remain in the accumulator
> for all times or is it a different thing? For example, If the accumulator
> capacity is 10 litres, then whole of this 10 litres cannnot be used in
> calculation, instead some portion of this capacity will always be occupied
> by some amount of fluid all the time in order to prevent the bladder to be
> sucked out when the accumulator is discharging. So the "initial volume"
> parameter is this this portion of fluid or something else? and how to
> calcualate the value of that portion of fluid?
>
> I will highly appreciate any response.
> thanks,
>

have a look at the doc:
http://www.mathworks.com/access/helpdesk/help/toolbox/physmod/hydro/ref/gaschargedaccumulator.html

"Initial volume:
Initial volume of fluid in the accumulator. This parameter specifies the
initial condition for use in computing the block's initial state at the
beginning of a simulation run."

It is the initial volume of hydraulic fluid store din the accumulator.

HTH,

Arnaud


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