Boom Lift Crawler Outrigger with Hydraulic Actuation (Test Harness)

This example models the hydraulic actuation system for one outrigger of a boom lift. A double-acting cylinder extends or contracts to raise and lower the chassis. Pilot-operated check valves lock the cylinder in place. In the boom lift, four outriggers move independently to keep the boom level and to distribute the load.

This model is a test harness from the main model (see documentation).

Contents

Model

Open Model

Component Under Test

The component under test is a hydraulic actuation system for the outriggers of a boom lift. A double-acting cylinder with three pilot check valves extends to lower the outrigger. The pilot check valves lock the cylinder in place when the 4-way valve returns to center, even if a hose upstream bursts so the outriggers don’t collapse. Two pilot check valves are on the extend side of the cylinder in case one fails while the system is in use.

Simulation Results: Chassis Sequence

The plots below shows the result of a test sequence that extends and retracts all actuators in the chassis (outriggers and tracks). The test sequence includes signals for all valves so that the test sequence can also be run on the full model.

Below is the corresponding prescribed motion for the test. This allows testing on a full model that has motion for any combination of the actuators.

Motion of the actuators along with applied actuator force.

Hydraulic pressures in the actuators along with actuator position.