ABB MEGADRIVE LCI Transmission Vibration Suppression

Ship propulsion systems: Ship propulsion shafts are usually extremely long, including propellers, intermediate shafts, and gearboxes, and their torsional vibration characteristics are very complex. In complex sea conditions, the load fluctuations of propellers can easily trigger shaft torsional vibrations. The damping function of MEGADRIVE LCI can effectively smooth out these fluctuations and protect expensive propulsion shafts from fatigue damage, which is crucial for the safe navigation of ocean going vessels.

Cement plant mills: During the operation of tube mills or vertical mills, significant low-frequency torque fluctuations are generated due to the rolling of grinding media and the non-uniformity of materials. This impact not only affects the lifespan of the transmission system, but may also cause frequent overcurrent tripping of the frequency converter. Through active damping, the torque output can be significantly smoothed, reducing mechanical impact.

Compressors, especially reciprocating or centrifugal compressors, are prone to torsional vibration in the transmission system due to airflow pulsation or "surge" phenomenon during start-up or specific loads. The damping function helps to expand the stable operating range of the compressor and reduce unnecessary shutdowns.

From diagnosis to implementation: ABB's professional engineering service process

For on-site engineers, discovering vibration problems is only the first step, and how to fundamentally solve them is the key. Relying solely on on-site adjustment of frequency converter parameters often treats the symptoms rather than the root cause. ABB provides a rigorous engineering service process to address such risks:

Torsional analysis:

Before implementing the damping function, a torsional vibration analysis of the system must be conducted first. ABB's expert team will establish a multi mass mathematical model for the transmission system based on the mechanical drawing parameters provided by customers (such as shaft diameter, inertia, stiffness), or by collecting actual speed and torque data on-site (or remotely). Through simulation analysis, accurately locate the natural frequency, damping ratio, and potential oscillation modes of the system, and evaluate the risk areas of resonance.

Customized Implementation:

After clarifying the issue, the implementation process needs to work closely with the customer to minimize the impact on production. Engineers will deploy damping algorithms to the PEC control platform of MEGADRIVE LCI and accurately set filter and damping gain parameters based on previous analysis results. In the subsequent load testing, the damping effect will be further verified and fine tuned through step response or sweep frequency testing to ensure that the system can maintain stability under various operating conditions.

Core benefit: Not just eliminating vibration

By deploying a transmission system vibration damping solution for MEGADRIVE-LCI, enterprises can obtain comprehensive engineering benefits:

Improving transmission reliability and reducing fault risk: Suppressing dangerous oscillations means significantly reducing the probability of sudden mechanical system failures and minimizing costly unplanned shutdowns.

Extending equipment lifespan and reducing maintenance costs: Eliminating torsional fatigue can significantly extend the lifespan of gearboxes, couplings, and long wheelsets. Fewer component replacements mean lower spare parts inventory costs and longer regular maintenance intervals.

Optimize performance and expand operating range: While ensuring safety, the system can operate within a wider range of speeds and loads, and reduce energy loss caused by oscillation.