AR時系列解析法を用いた振動系の構造非定常性解析

概要

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Dynamic system identification technique, whereby the structural nonstationary behaviour can be estimated, is proposed and examined from the practical viewpoint. First, structural parameter estimating method with the aid of auto-regressive model fitting proposed in the former report is further developed to the system in which its natural frequency and damping variate with time. Such a structural nonstationality is represented as a kind of trajectory on the complex sτ-characteristic plane which is obtained through z-trans formed plane. Numerical examination is carried out for the practical model such as a liquid storage tank in which stored amount should variate with time. Second, proposed technique is applied to the inelastic structure system. Equivalent linealization is introduced in order to estimate equivalent damping which associates with inelastic energy absorbing effect. After linealization, it is made clear that inelastic behaviour can be also expressed on the linealized sτ-characteristic plane. Obtained results are investigated by comparing the results through statistical linealization method and the inelastic response analysis.
1984-10-25