experimental modal analysis testing

Basics of Experimental Modal Analysis

First Online: 23 February 2023

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C. Sujatha 2

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Experimental modal analysis deals with the determination of modal parameters, such as natural frequencies, damping properties and mode shapes of a structure through experiments. In any experimental modal analysis procedure, modal parameters are to be estimated from the measured frequency response functions (FRFs), i.e. from the output response and input force data and the quality of an experimental modal model is only as good as the quality of the FRFs. Though the entire process of obtaining the required data is experimental in nature, many mathematical techniques are involved in the computation of FRFs and modal parameter extraction. This chapter begins with a description of some important experimental aspects of modal testing like support conditions of the test structure, minimising exciter/test structure interaction, choice of exciters/shakers, selection of excitation signals, sensing techniques, problems in the measurement of excitation force, impact testing and the difficulties involved therein, etc. The chapter then goes on to describe the graphical representation and properties of FRFs of single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF) systems for both the undamped and damped cases.

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Sujatha, C. (2023). Basics of Experimental Modal Analysis. In: Vibration, Acoustics and Strain Measurement. Springer, Cham. https://doi.org/10.1007/978-3-031-03968-3_9