Abstract: The dynamic properties of an existing structure are altered, when a mass and/or a spring are added to or removed from the structure. Therefore it is important to know dynamic properties of the structure after modification. One way to determine dynamic properties of the structure is the experimental modal analysis which uses measured Frequency Response Functions (FRFs). In the present study, a general and exact method is presented based on the Sherman-Morrison formula in order to calculate FRF of the structure modified by concentrated mass and grounded spring. The method is very effective and uses only a few FRFs related to modification coordinates of the un-modified structure.

• Publication Date: 19-Apr-2015
• DOI: 10.15224/978-1-63248-045-3-84
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Abstract: This paper presents the measurement procedures and the results of the Acoustic Emission (AE) assessment on ID Fan journal bearings. Vibration data were also acquired in an effort to compare the sensitivity of both techniques in detecting incipient failures. Series of Acoustic Emission (AE) and vibration measurements have been undertaken on the selected journal bearings for ID fan at power plant. AE and vibration statistical parameters were calculated from the collected raw data in an effort to compare the sensitivity of both techniques in detecting incipient failures. The purpose of the measurements is to evaluate the capability of AE system in detecting incipient failures in journal bearing. This report details the measurements procedures undertaken and the results of this assessment.

• Publication Date: 19-Apr-2015
• DOI: 10.15224/978-1-63248-045-3-85
• Views: 0
• Downloads: 0