Experimental Modal Analysis in the power train of ECO 100 Alstom Wind wind turbine

Alstom Wind, a leading wind turbine manufacturer, has required ICR, Ingeniería para el Control del Ruido S.L., services in order to carry out an Experimental Modal Analysis (EMA) in the power train of ECO100 wind turbine. ICR, that has a long experience in this specific type of study, has analyzed the different parts in which the power train is divided: slow axis and multiplier.  The slow axis is the axis which rotates at same speed as the blades and the multiplier have the function to augment the velocity of rotation for adapting it into the generator in which is connected.

For the present EMA, ICR has based the study on vibration measurements carried out in Alstom Wind Buñuel Factory. The test has consisted of measure the vibration response of the power train on various points when an external force is exerted. This excitation is realized by impacts through instrumented hammers of force, measuring the force exerted on the mechanic system.

At a later stage, ICR has continued the study in its facilities with the analysis of the data obtained during the test through identification modal algorithms. This process has allowed characterize with an experimental form the vibration modes of the structure of the Alstom wind turbine power train.

Experimental Modal Analysis (EMA) is a methodology that allows obtain the vibrations modes of any mechanic system. With this methodology of study can be known with better accuracy the dynamic behavior of the product to be studied and, consequently, reduce its vibrations. The result is a design more reliable, robust and less maintenance specifications. Additionally, the results obtained through Modal Analysis are compared with the results obtained through numerical modes. ICR has been using this methodology of modal analysis since more than 15 years in all manner of structures such as, motors of different size, metallic structures, automotive components, wind turbines, bridges and any other structure of civil engineering. 

ICR is an Acoustic Engineering resolving problems of noise and vibrations. ICR works for the railway, car, industry, construction and environmental sectors. The company researches (R+D) new methods to solve vibroacous-tic problems. ICR also designs software for quality control and transmis-sion loss and teaches acoustics to private companies and official colleges.
Ingenieria para el Control del Ruido – Barcelona.

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