Model updating concerns the modification of an existing but inaccurate model with measured data. For models characterized by quadratic pencils, the measured data usually involve incomplete knowledge of natural frequencies, mode shapes, or other spectral information. In conducting the updating, it is often desirable to match only the part of observed data without tampering with the other part of...

In this paper, a non-probabilistic method based on fuzzy logic is used to update finite element models (FEMs). Model updating techniques use the measured data to improve the accuracy of numerical models of structures. However, the measured data are contaminated with experimental noise and the models are inaccurate due to randomness in the parameters. This kind of aleatory uncertainty is irreduc...

Seismic signals are characterized by strong excitations, short durations, non-linearity and non-stationarity having both the amplitude and frequency content vary as a function of the recorded time. Various classical detection and estimation techniques, like the time-frequency representations and the Fourier-based techniques have been used to analyze such signals, but these techniques have varie...

We propose a method for obtaining an improved representation of transients in audio signals. The representation is based on a damped sinusoidal model. To improve the representation, transient locations are modified in such a way that a transient can start only at the beginning of a sinusoidal segment. The introduced modifications facilitate a reduction of the number of damped sinusoids needed t...

In this paper, Bayesian finite element (FE) model updating is applied for uncertainty quantification in the multi-stage damage assessment of a seven-story reinforced building slice. The results of the Bayesian updating scheme are analyzed using a detailed uncertainty and resolution analysis which involves computing the posterior statistics and solving an eigenvalue problem. It is shown that the...

In order to identify more accurate finite element (FE) model parameters for an as-built structure, experimental data collected from the actual structure can be used to update the parameter values. In practice, experimental data is inevitably contaminated with measurement noise, which may lead to inaccurate FE model updating. This research compares the performance of two model updating approache...

Model updating concerns the modification of an existing but inaccurate model with measured data. For models characterized by quadratic pencils, the measured data usually involve incomplete knowledge of natural frequencies, mode shapes, or other spectral information. In conducting the updating, it is often desirable to match only the part of observed data without tampering with the other part of...

A discrete-time internal model principle based adaptive algorithm for identifying signals composed of a sum of exponentially damped sinusoids is presented. The time varying state variables of an internal model principle controller in a feedback loop can provide estimates of the exponentially damped sinusoidal signal parameters, the damping factor and the frequency. By using additional integral ...

Parts mating often requires the use of compliant motions, which cause an object in the grasp of a robot to slide along obstacles in its environment. This paper is about the interface between a compliant motion progra mming system and a compliant motion control system. We propose that in this interface the robot can be modeled as a damped spring. This model allows the programmin g system to spec...

We consider a model for a damped spring-mass system that is a strongly damped wave equation with dynamic boundary conditions. In a previous paper we showed that for some values of the parameters of the model, the large time behaviour of the solutions is the same as for a classical springmass damper ODE. Here we use spectral analysis to show that for other values of the parameters, still of phys...