Abstract Summary
In this paper, the dynamic stiffness at high frequencies of various elastic elements has been assessed through a set of laboratory tests, where a simple mass-element-mass-isolator test rig based on the proposals presented in ISO 10846 has been used for performing the measurements. In this context, three existing experimental approaches for the dynamic characterization of elastic elements have been compared: the indirect method proposed by ISO 10846, a frequency-independent characterization method based on the transmissibility peak, and an existing methodology for in-situ applications that in this work has been proposed to be used for laboratory assessments. In order to compare these methodologies, the axial dynamic stiffness of different elastic components has been obtained thought the three methods proposed. Moreover, the existing in-situ approach has been used to also determine the rotational dynamic stiffness of the characterized specimens. The application of the approach also showed that the rotational components of the response must be considered in the characterization elastic elements, especially when their rotational stiffness is low and, consequently, the rotational degrees of freedom are significant for the motion of the upper mass of the setup under the testing excitations. Results show that the in-situ method applied to laboratory-based setups allows for obtaining accurate results for a wide range of frequencies with a simple experimental setup.
