In this paper, a fast frequency domain global modal parameter identification algorithm is proposed. The modal parameters are identified with amplitude square of FRF instead of its traditional real part & imaginary part. By discrete transformation, all additional pseudo roots are reciprocal of the real roots and their conjugates. The physical roots can be separated from mathematical roots with s...

Estimating the fundamental frequency and harmonic parameters is basic for signal modeling in a power supply system. This paper presents a complexity-reduced algorithm for signal reconstruction in the time domain from irregularly spaced sampling values. Differing from the existing parameter estimation algorithms, either in power quality monitoring or in harmonic compensation, the proposed algori...

This paper focuses on the iterative parameter estimation algorithms for dual-frequency signal models that are disturbed by stochastic noise. The key of the work is to overcome the difficulty that the signal model is a highly nonlinear function with respect to frequencies. A gradient-based iterative (GI) algorithm is presented based on the gradient search. In order to improve the estimation accu...

Abstract Modal parameter estimation of randomly and ambient excited structures using output-only system identification techniques has become a recently essential issue for assessment of engineering structures, structural health monitoring and structural control. A number of mathematical models on the output-only identification techniques have been developed in the time domain, in the frequency ...

0003-682X/$ see front matter 2009 Elsevier Ltd. A doi:10.1016/j.apacoust.2009.07.003 * Corresponding author. Tel.: +1 217 352 6511. E-mail address: [email protected] (G.W. Swen Experiments were performed to measure the various sound-wave propagation parameters of two kinds of gravel, a crushed limestone and a stream-formed ‘‘pea gravel”, at frequencies between 25 and 200 Hz. The apparatus w...

In the present Next Linear Collider (NLC) design, S and L-band linacs are used to accelerate the beams to 10 GeV, where they are injected into the main X-band linacs. As injectors for the main accelerator, these linacs are required to deliver clean beams while being reliable and cost effective. These requirements set stringent tolerances on the design of the accelerators. There are two types of...

This is a new formulation which overcomes many of the numerical analysis problems associated with an old least squared error parameter estimation technique. Overcoming these problems has made this technique feasible for implementation on mini-computer based measurement systems. This technique is not only useful in modal analysis applications for identifying the modal parameters of structures, b...

In automatic speech analysis, voicing articulatory is often defined as a binary decision: voiced or unvoiced. Linguists agree that this articulatory should be continuous. In this paper, we present a new approach to compute a continuous voicing indicator of a speech frame. This voicing percentage is then evaluated in both a segmentation process and a speech recognition task. Promising results sh...

In the paper the analytical evaluation of the uncertainty on signal parameter estimation in frequency domain is dealt with. Two different and widely diffused algorithms able to compensate the spectral leakage effects due to asynchronous sampling are considered. The combined uncertainties on the final results (tones frequency, amplitude, and phase) due to the propagation of the uncertainty on th...