Putzmeister has unveiled the "Boom-Ease" active oscillation damping system for its M 36-5 series 36-meter 5-section concrete boom pump trucks, targeting high-rise pours and bridge deck applications where long pipeline runs and high pumping rates generate significant boom vibration. When concrete is pumped at 150 cubic meters per hour through a 36-meter boom pipeline, each stroke of the concrete pump's piston sends a pressure pulse through the pipeline. At typical pumping frequencies of 20 to 30 strokes per minute, these pulses excite the boom's natural bending harmonics, causing the boom tip to oscillate laterally by 50 to 150 millimeters. This "pipeline whip" makes precise concrete placement difficult, creates visible surface defects in the pour, and fatigues the boom structure over time.
The Boom-Ease system integrates "Tri-Axial MEMS Gyroscopes and Accelerometers" at each boom section's hinge pin. The engineering breakthrough is the "Multi-Mode Counter-Pulsing Logic." The system samples the angular velocity and lateral displacement of all five boom sections simultaneously at 200 hertz. From this data, the ECU mathematically decomposes the boom's vibration into its first, second, and third bending mode harmonics. Each mode has a distinct frequency and damping requirement, and the system identifies which mode is currently dominant.
The ECU then commands the "Boom Cylinder Counter-Pulsing Valves"-electronically controlled pilot-operated valves installed in each boom section's hydraulic cylinder. These valves inject small, precisely timed hydraulic pulses into the cylinders, 180 degrees out of phase with the detected oscillation. By actively counter-pulsing, the system cancels out the boom's bending wave before it amplifies. Furthermore, the system features "Pump-Sync Mode": when activated, the system synchronizes its counter-pulsing output with the concrete pump's stroke cycle, preemptively injecting the counter-pulse just before each pump stroke rather than reacting after the vibration has started. This predictive counter-pulsing reduces boom-tip oscillation amplitude by 80 percent, allowing precise concrete placement even at maximum pumping rates, and reduces operator fatigue during multi-hour continuous pours.
