Vibrational Properties of a Hemispherical Shell with Its Inner Fluid Pressure: An Inverse Method for Noninvasive Intracranial Pressure Monitoring

[+] Author and Article Information
Ashkan Eslaminejad

Mechanical Engineering Department North Dakota State University Fargo, ND 58108 ashkan.eslaminejad@ndsu.edu

Mariusz Ziejewski

111 Dolve Hall Fargo, ND 58105 Mariusz.Ziejewski@ndsu.edu

Ghodrat Karami

North Dakota State University Fargo, 58108-6050 Fargo, ND 58108 G.Karami@ndsu.edu

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received September 14, 2018; final manuscript received January 23, 2019; published online xx xx, xxxx. Assoc. Editor: Miao Yu.

ASME doi:10.1115/1.4042928 History: Received September 14, 2018; Accepted January 23, 2019


Vibration due to a hammer-impact on an aluminum hemisphere fully-filled with water is determined to study the frequency response of the structure at different inner fluid pressures. Modal analysis techniques are utilized on the frequency response functions to extract the modal frequencies and the damping ratios at each pressure level. As fluid pressure increases, changes to the peaks of frequency response are observed. Due to this the modal frequencies will also undergo some shifts with changes in the repeated poles of frequency response. Changes can also be observed in singular bending wave modes. An inverse analysis of such changes due to inner pressure in modal frequencies of the structure can make a possible method for using vibrational stimulus and response in a noninvasive intracranial pressure monitoring system.

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