Achieving Ecient Control Of Hydraulic Systems Using Ono Valves Michael Berne Rannow by Michael Berne Rannow instant download after payment.

Hydraulic systems o er a range of bene ts, such as high power density, ruggedness,linear actuation, and low cost, which have led to the use of hydraulic actuation systems throughout a wide range of industries. However, they also typically suer from lower eciency than competing methods of actuation, which limits their appeal in some applications, and presents a threat to their continued prevalence as energy eciency becomes increasingly important. The relatively low eciency of hydraulic systems is due in part to inecient components, such as pumps and motors, and partially due to the typical method of control, which uses throttling valves to place restrictions in the  low path to dissipate excess power as heat. Several approaches to reducing throttling losses have been studied, such as using pumps, motors, or transformers to control individual actuators, or creating circuits with multiple pressure levels to reduce the pressure drop across individual valves. However, these approaches often su er from high cost and size requirements, or experience reduced control performance, which can limit their appeal.An alternative approach is to use high-speed on/o valves to charge and discharge energy storage elements to transform the power ow rather than restricting it. Di erent con gurations of switching hydraulic circuits can be used to create variable pumps, motors,actuators, or transformers. This approach can signi cantly reduce the power loss that is typically associated with controlling hydraulic systems using conventional valves.