File Name: meter in and meter out circuit .zip
Here the flow control valve is installed in the return line metering the fluid being discharged. In that way, this circuit also gives the control over the actuating speed.
Bath, United Kingdom. September 10—12, To decrease throttling losses in mobile hydraulic systems a number of new system architectures have been introduced in recent years. The concept of independent metering IM , developed in the seventies, shows a lot of promise . By allowing the meter-in as well as meter-out edges to be controlled separately, additional operating modes are created allowing a more efficient adaptation of system pressure to load pressure [2, 3].
Hydraulic Meter In: Meter-in control refers to the use of a flow control at the inlet to an actuator for used with actuators against which the load in opposition to the direction of movement. For a meter-in-circuit that uses a simple adjustable restrictor valve selection of the DCV to create extension of the actuator will cause flow to pass through the restrictor into the piston end of the actuator. The required piston pressure, Pp, will depend on the opposing force on the actuator rod. With a fixed displacement pump delivering a constant flow, excess flow from the pump will be returned to tank by the relief valve at its set pressure. Consequently, the available pressure drop, PSmax-Pp will determine the flow delivered to the actuator for a given restrictor opening. With this system the flow, and hence the actuator velocity, will vary with the load force.
Due to the demand for energy efficiency in electro-hydraulic systems, the separate meter in and separate meter out SMISMO control system attracts vast attention. In this paper, the SMISMO control system was configured with two servo valves to control the meter in and meter out separately. By designing two of the proposed indirect adaptive robust dynamic surface controllers IARDSC for the working-side and off-side system and setting the coupled items as estimated parameters, the SMISMO control system was decoupled into two subsystems completely. Here, indirect adaptive robust control IARC was employed to address the internal parameter uncertainties and external disturbances. As thus, the proposed IARDSC could simplify the design procedure, decrease the computational cost, and achieve an improved control performance in practical use. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve.
In meter-out speed control, the effective area of the flow control valve is larger than that of meter-in, and the supply Request Full-text Paper PDF Analysis of Pneumatic Cylinder Responses Driven by Meter-out Circuit.
WP Hydraulic circuits are designed according to their task and their area of application. Designing hydraulic circuits requires knowledge of flow behaviour and pressure losses in valves and fittings, as well as characteristics of the pump.
Objective: To become more knowledgeable with the hydraulic system. A cylinder is speed is determined by its size and the flow rate of the oil going to or out of it. A large diameter cylinder would hold more oil and take longer to complete its stroke; a smaller the cylinder would move faster.
Meter-out controls restrict fluid leaving the cylinder to retard the cylinder's movement. This type of flow-control circuit works for any type of load -- and works best.Ruben L. 06.05.2021 at 12:35
Thank you for posting such a great blog.