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would three identical hydraulic accumulators working simultaneously exert more pressure or makes no difference
I am currently doing a school project about hydraulic suspension. the project uses a hydraulic cylinder linked to three hydraulic accumulators which supposedly absorb the shocks or impacts, therefore acting as a coil spring. Now...to vary the stiffness of the suspension i thought of using three identical accumulators. one mode allows only one accumulator to function in the circuit, another allows two accumulators to function within the circuit and the last mode includes all three accumulators to function within the circuit. Now...my question is....will three accumulators working simultaneously exert more pressure than one accumulator therefore creating a stiffer suspension? or the results are equivalent to using one or two accumulators? I am abit in a dilemma of what really happens since the three accumulators are identical. I am quite new to hydraulic accumulators. thank u for your help.
Lets just compare the model with one accumulator vs the three accumulators.
An accumulator has the hydraulic fluid side and a gas side. The diaphragm or piston moves so that the pressure in the gas and fluid sides both stay the same.
With one accumulator if the cylinder moves a distance- lets say 1" it will displace a set volume of fluid. Lets assume the diameter of the cylinder is such that this movement displaces 1 cubic inch of fluid. the fluid is basically incompressible. So the gas compresses this amount of volume (1 in^2) and the pressure goes up. For this example lets assume the original gas volume is 10 cubic inches- the second volume is 9 in^2. Pressure has gone up 11%.
For the case of three accumulators- the piston once again moves 1 inch and displaces 1 in^2 of fluid. But since this total liquid volume is divided among three accumulators the change in gas volume of each accumulator is only 1/3 of a cubic inch. So the second gas volume is 9.66 cubic inches of gas and the pressure rises only 3%.
So for multiple accumulators you will have a system that less stiff.
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