Backhoe with Custom Valve

This example shows the performance of various hydraulic valves in a backhoe actuation system. The abstract valve includes no spool dynamics. The spool valve models an electromagnetically actuated spool with a centering spring. The flapper-nozzle with centering spring uses the hydraulic pressure to actuate the spool. The flapper-nozzle with feedback uses hydraulic pressure to actuate the spool, and spool is connected to the flapper providing a mechanical form of feedback within the system.

The model can be configured to use any of these valve types, and hydraulic forces on the spool due to flow through the orifices can be enabled or disabled for each valve type that models spool dynamics.

Contents

Model

Tilt Actuator Subsystem

Abstract Valve Variant

Spool Valve Variant

Nozzle Centering Spring Valve Variant

Nozzle Feedback Spring Valve Variant

Simulation Results from Simscape Logging

The following plots compare system performance with different valve types. Orifice hydraulic forces on the spool are neglected.

Testing Abstract No Force
Testing Spool No Force
Testing Flapper Nozzle Centering Spring No Force
Testing Flapper Nozzle Feedback Spring No Force

Orifice Hydraulic Forces in Spool Valve

Testing No_Force
Testing With_Force

Orifice Hydraulic Forces in Flapper Nozzle Valve with Centering Spring

Testing No_Force
Testing With_Force

Orifice Hydraulic Forces in Flapper Nozzle Valve with Feedback Spring

Testing No_Force
Testing With_Force