Our customer in the marine industry had been experiencing excessive vibrations and background noise on the vehicle deck of his ferry. These high vibrations were above the emission limits of the ISO 20283-5 Standard. Over a period of 3 years, the cardan shaft had to be exchanged every 6 months due to a worn out spline. In addition, exhaust pipes were broken and bolts were loosened. The customer worked with several service providers but was unable to resolve the problem.
Following an unplanned stop caused by a broken cardan shaft, which forced the operator to unload the ferry, organize a new one and caused expenses of around 20,000 € they approached Off-Highway Powertrain Services (OHP Services) to understand the real root cause of the problems and come up with a long term solution.
Vibration measurements were made to ascertain the natural frequency of the parts and determine the appropriate frequencies for smooth functioning of the powertrain. Based on these, the powertrain had to be adjusted and a number of components exchanged.
To avoid a clash with natural frequencies a coupling was substituted and rubber feet were replaced by spring feet. After the corrective actions were implemented, a base measurement was carried out to act as a comparison value for all future measurements, to help determine the actual condition of the powertrain.