Experimental and numerical vibration analysis of plates with curvilinear sub-stiffeners. (15th April 2020)

• Record Type: Journal Article
• Authors: Praticò, Luca; Galos, Joel; Cestino, Enrico; Frulla, Giacomo; Marzocca, Pier
• Is Part Of: Engineering structures. Volume 209(2020)
• Publication Date: 2020-04-15
• Subjects: Vibration -- Finite element -- Modal analysis -- Laser Doppler vibrometry (LDV) -- Curvilinear stiffener; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2019.109956
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Numerous techniques can be used to capture the vibration response of curvilinear stiffened plates. Different stiffening patterns provide unique directional properties and distinct mode shapes. Curvilinear stiffened plates can have similar natural frequencies but different mode shapes. Abstract: Curvilinear stiffened panels are being developed for aerospace structures and other applications. This paper presents an experimental and numerical study into the vibration response of three curvilinear stiffened square plates clamped at the edges. The experimental modal analysis was performed using laser Doppler vibrometry (LDV) and an impact hammer test. Two of the three plates was constructed with curvilinear stiffener geometry, while the third was a straight stiffened plate with the stiffeners oriented at an angle to the edge of the plate. Even though the natural frequencies of the plates are similar, the different stiffening patterns was sufficient in providing unique directional properties and therefore distinct mode shapes. The numerical modal analysis of the plates was performed using finite element analysis (FEA). A comparison of the experimental and numerical results was carried out in terms of natural frequencies and mode shapes, using relative differences and modal assurance criterion (MAC), respectively. The experimental and numerical results were in good agreement for all the three plates. The difference between experimental and numerical natural frequencies was typically less than 5% and the diagonal MAC values typically ranged from 0.8 to 1. This is in line with previously published results in the literature. The reasons for differences between the experimental and numerical results, and the practical significance of the findings, are also discussed.