Consider the problem of deciding an accumulator size if 6 L of oil is to be...

Transcribed Image Text:

Consider the problem of deciding an accumulator size if 6 L of oil is to be deliv- ered when a circuit, operating at 207 bar, discharges to a pressure of 110 bar in 0.8 s. It is assumed here that the operating pressure is achieved by a slow charging process and discharging process is fast process. Pre-charge the accumulator to 90% of the lowest pressure used. Find the volume of gas for pre-charge pressure V1, operating pressure V2 and discharge pressure V3 using the graph given in Figure 2. 2 1.9 0-8 s 9-30 s 1.8 31-60 s 1.7 -x-61-120 s 22 1.6 1.5 1.4 1.3 1.2 1.1 50 100 150 200 Average system pressure (bar) Fig. 2--- Q5 V 99 bar V 207 bar V 110 bar Slow process Fast process Pyk = constant 0 = PV=const Precharged Set to system pressure Rapid discharge The process of charging and discharging. Consider the problem of deciding an accumulator size if 6 L of oil is to be deliv- ered when a circuit, operating at 207 bar, discharges to a pressure of 110 bar in 0.8 s. It is assumed here that the operating pressure is achieved by a slow charging process and discharging process is fast process. Pre-charge the accumulator to 90% of the lowest pressure used. Find the volume of gas for pre-charge pressure V1, operating pressure V2 and discharge pressure V3 using the graph given in Figure 2. 2 1.9 0-8 s 9-30 s 1.8 31-60 s 1.7 -x-61-120 s 22 1.6 1.5 1.4 1.3 1.2 1.1 50 100 150 200 Average system pressure (bar) Fig. 2--- Q5 V 99 bar V 207 bar V 110 bar Slow process Fast process Pyk = constant 0 = PV=const Precharged Set to system pressure Rapid discharge The process of charging and discharging.