Abstract
The study of the structural dynamics is essential for understanding and assessing of any engineering product performance, knowledge of dynamic structural response being fundamental to ensuring a sustainable and safe product functioning. From all techniques for structural response assessment, the experimental modal analysis (EMA) provides one of the most comprehensive tools for collecting the experimental data, relevant for structure investigation and assessing of the structural response under normal or imposed operating conditions. Once identified the structure in terms of modal model, it can begin to its optimization to face new challenges or functioning tasks. The article presents an experimental modal analysis application, performed on a LEMA 6000kW electric locomotive body on the production cycle of SC Softronic Craiova. The application was made to validate the dynamic finite elements model realised in order to certify the crashworthiness locomotive design and to evaluate the body interaction with bogie and track to avoid the locomotive structural resonance phenomena.
Highlights
Background of experimental modal analysisExperimental modal analysis (EMA) is the process of building the mathematical model of a system based on experimental determined modal parameters in view to investigate the structural response to the given load conditions, to evaluate the effect of controlled structural changes, or to evaluate the structure response to the required conditions in new applications.Usually, by using the numerical analysis techniques it is done the analysis of structure vibration state in terms of frequency response function (FRF)
Through experimental modal analysis are determined the modal parameters of the system in terms of: modal frequencies, modal damping and modal shapes, which together provide a
The analytical model, usually, is prepared using the finite elements method (FEM) and associated mathematical model involves a set of complicated coupled differential equations that can be solved only by using advanced computing techniques
Summary
Experimental modal analysis (EMA) is the process of building the mathematical model of a system based on experimental determined modal parameters in view to investigate the structural response to the given load conditions, to evaluate the effect of controlled structural changes, or to evaluate the structure response to the required conditions in new applications. The analytical model, usually, is prepared using the finite elements method (FEM) and associated mathematical model involves a set of complicated coupled differential equations that can be solved only by using advanced computing techniques. Associated mathematical model consists of a limited set of differential equations, one for each degree of freedom This model is often referred as "experimental modal model". Experimental modal analysis techniques are used in a wide range of applications, including: structural optimization; prediction of dynamic behaviour; assessment of the excitation forces from only vibration response; prediction of structural response under the effect of complex excitations; validation of analytical finite elements model by experimental data; detection, location and evaluation of structural defects
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