The modal testing experiment presented here is performed by a medical system manufacturer using ModalVIEW software and National Instruments DSA hardware as the modal testing and analysis tool. The analysis result is used to verify noise and vibration performance of their structure design.
The testing object is a CT scanner structure:
The structure of CT scanner is excited by impact hammer, and the vibraiton is measured using tri-axial accelerometer. ModalVIEW modal analysis software provides FRF measurement and advanced modal analysis
method based on mode stabilization diagram to extract modes from
FRF data. National Instruments 24-bit module USB-4431 is used to guarantee the
accurate measurement of weak vibration signal of measured points far away from
In this modal testing experiment, the following software and hardware are used：
1．ModalVIEW R2 Software.
2．NI DSA System (USB-4431)
3．Tri-axial accelerometer (PCB 356A26).
4．Impact Hammer (PCB 086C01) .
3D model of CT scanner structure is created from its photo. ModalVIEW helps to quickly create 2D grid from manually selected nodes on photo.
Analysis resultsModal analysis for the structure is finished with ModalVIEW’s advanced mode estimation method based on mode stabilization diagram from 149 measured FRF data. Part of the mode shapes are displayed as following :
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|Last updated April 28th, 2018|