Identificação de perturbações externas em sistemas mecânicos no domínio da frequência utilizando técnicas de estimação.

Abstract

In this work different mathematical formulations in time and frequency domain are studied and developed to identify parameters in mechanical systems with emphasis in excitation forces identification using least square, instrumental variables and sequencial estimation methods. Digital simulations are processed in time and frequency domain to verify the mathematical formulations developed and also doing analysis and discussions about the efficacy of several estimation methods above described. Moreover are commented and discussed the more relevant aspects about excitation signals properties and its relation of cause-effect in phisical systems. Finally, are presented results of forces identification in frequency domain, where the validation of mathematical models are tested and moreover the efficiency of several estimators In this case, the influence of point numbers in signals discretization, as well as the superposition of noise effect in response measurements and its effects at values of identified forces are investigated.