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This paper experimentally investigates the vibrational responses of a clamped ribbed plate.The dynamic characteristics and mode shapes of the ribbed plate are measured and compared to results obtained from an analytical solution and from finite element analysis.The dependency of the dynamic response of the ribbed plate on the distance between the excitation force and the rib is also investigated.It is shown that the vibrational response of a clamped ribbed plate due to point force excitation is controlled by the plate stiffness when the source is more than a quarter plate bending wavelength away from the rib and from the plate boundary.The response is largely affected by the rib stiffness when the source location is less than a quarter wavelength away from the rib.Discrepancies between the computational and experimental results are also discussed.