Basket Rotation with Hydraulic Actuation (Test Harness)

This example models the hydraulic actuator to orient a boom lift basket. A double-acting rotational actuator rotates the basket into position. Counterbalance valves ensure the system stays locked in place.

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 rotary actuator. The hydraulic network contains a four-way valve to control the rotation direction and two counterbalance valves. The counterbalance valves lock the actuator in place when the 4-way valve returns to center. The lock persists if pressure upstream drops so the basket doesn’t begin to drift while the crew is still at work.

Simulation Results: Basket Rotate Sequence

The plots below shows the result of a test sequence designed to actuate only the rotational actuator for the basket. 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 basket (and turret) along with applied actuator force.

Hydraulic pressures in the actuators along with actuator position.