Flexible Telescoping Boom

This example models the telescoping boom of a boom lift with flexible bodies. The flexible bodies are modeled both using classical beam theory and reduced order models as exported from finite element tools. The model is used to identify natural frequencies at different levels of boom extension.

Contents

Model

Open Model

Telescoping Flexible Boom

The flexible boom is modeled using two methods - classical beam theory and reduced order models.

The beam has three nested segments.

The Flexible Rectangular Beam Block ("Mid Beam" block in this image) uses classical beam theory to model the flexible portion of the beam. The overlapping section of the nested beams is assumed to be rigid.

In the ROM variant, the "Mid Beam" block is replaced with a Reduced Order Flexible Solid block which uses stiffness and damping matrices to model the flexible body behavior

Simulation Results: Tilt Sequence

The plot below shows a test sequence designed to tilt the boom.

Motion of the lift, extend, and jib actuators along with applied actuator force.

Simulation Results: Frequency Response, Varying Extension

The plot below shows the variation in frequency response.

Extension level 1: 0.05
Extension level 2: 0.1
Extension level 3: 0.15
Extension level 4: 0.2
Extension level 5: 0.25
Extension level 6: 0.3
Extension level 7: 0.35