Turbomachinery Laboratory, Texas A&M Engineering Experiment Station
Abstract
Case StudyHigh vibration were observed on the motor, pump,structure for more than 2 years with 1X dominant motor vibration. Assuming that the issue is of complete structural issue even though this motor was running well in the past, some structural modifications have been carried out at site which includes a welding a mass of 100 Kg on the structure in addition to the installation of braces to the structure which did not yield any positive results. Structural measurement along with the ODS carried out at site did not reveal a significant issue with the structure itself except for the structural natural frequency slightly closer to the running frequency of the motor. The decision to carry out an onsite balancing on the motor which was intended to remove the excitation force yielded good results which exposed additionally a mistake in the balancing activities carried out by a local vendor at work shop
