Simscape™

Translational Hydro-Mechanical Converter

Simulate single chamber of hydraulic cylinder as building block for various cylinder models

Library

Hydraulic Elements

Description

The Translational Hydro-Mechanical Converter block models an ideal transducer that converts hydraulic energy into mechanical energy in the form of translational motion of the converter output member. Using this block as a basic element, you can build a large variety of hydraulic cylinder models by adding application-specific effects, such as fluid compressibility, leakage, friction, hard stops, and so on.

The converter is simulated according to the following equations:

where

q	Flow rate due to fluid compressibility
A	Effective piston area
v_R	Converter rod velocity
v_C	Converter case velocity
F	Force developed by the converter
p	Gauge pressure of fluid in the converter chamber
or	Converter orientation with respect to the globally assigned positive direction. If pressure applied at port A exerts force in positive direction, or equals 1. If pressure applied at port A exerts force in negative direction, or equals –1.

Port A is a hydraulic conserving port associated with the converter inlet. Ports R and C are translational mechanical conserving ports associated with the rod and the case of the converter, respectively.

Basic Assumptions and Limitations

The model is based on the following assumption:

The block simulates an ideal converter, with only the transduction property considered. No inertia, friction, leakage, or other effects are taken into account.

Dialog Box and Parameters

Piston area: Effective piston area. The default value is 5e-4 m^2.
Converter orientation: Specifies converter orientation with respect to the globally assigned positive direction. The converter can be installed in two different ways, depending upon whether it exerts force in the positive or in the negative direction when pressure is applied at its inlet. If pressure applied at port A exerts force in negative direction, set the parameter to Acts in negative direction. The default value is Acts in positive direction.

Restricted Parameters

Ports

The block has the following ports:

A: Hydraulic conserving port associated with the converter inlet.
R: Mechanical translational conserving port associated with the rod of the converter.
C: Mechanical translational conserving port associated with the case of the converter.

Examples

The Closed-Loop Circuit with 4-Way Valve and Custom Cylinder demo (sh_closed_loop_circuit_4_way_valve_cust_cyl) and the Hydraulic Flapper-Nozzle Amplifier demo (sh_hydraulic_flapper_nozzle_amplifier) illustrate the use of the Translational Hydro-Mechanical Converter block in hydraulic systems.