scholarly journals Operational Modal Identification of Time-Varying Structures via a Vector Multistage Recursive Approach in Hybrid Time and Frequency Domain

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Si-Da Zhou ◽  
Li Liu ◽  
Wu Yang ◽  
Zhi-Sai Ma
Keyword(s):  
Parameter Estimation ◽  
Frequency Domain ◽  
Real Time ◽  
Time Estimation ◽  
Recursive Estimation ◽  
Modal Parameters ◽  
Time Varying ◽  
Modal Parameter ◽  
Structural Dynamic ◽  
Modal Parameter Estimation

Real-time estimation of modal parameters of time-varying structures can conduct an obvious contribution to some specific applications in structural dynamic area, such as health monitoring, damage detection, and vibration control; the recursive algorithm of modal parameter estimation supplies one of fundamentals for acquiring modal parameters in real-time. This paper presents a vector multistage recursive method of modal parameter estimation for time-varying structures in hybrid time and frequency domain, including stages of recursive estimation of time-dependent power spectra, frozen-time modal parameter estimation, recursive modal validation, and continuous-time estimation of modal parameters. An experimental example validates the proposed method finally.

Simultaneous Dynamics-Based Visual Inspection Using Modal Parameter Estimation

2011 ◽  
Vol 23 (1) ◽  
pp. 180-195 ◽  
Author(s):  
Hua Yang ◽  
◽  
Takeshi Takaki ◽  
Idaku Ishii
Keyword(s):  
Parameter Estimation ◽  
Real Time ◽  
Visual Inspection ◽  
Dynamic Properties ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Modal Parameter ◽  
Resonant Frequencies ◽  
Modal Parameter Estimation ◽  
Non Destructive

In this study, we introduce the concept of dynamicsbased visual inspection with High-Frame-Rate (HFR) video analysis as a novel non-destructive active sensing method for verifying dynamic properties of a vibrating object. The HFR video is used for determining the structural dynamic properties of an object, such as its resonant frequencies and mode shapes, which can be estimated as modal parameters by modal analysis only when the object is excited. By improving and implementing a fast output-only modal parameter estimation algorithm on a real-time 2000-fps vision platform, the modal parameters of an excited object are simultaneously estimated as its input-invariant dynamic properties for dynamics-based visual inspection evenwhen the objects undergo different excitation conditions. Our simultaneous 2000-fps visual inspection system can facilitate non-destructive and longterm monitoring of the structures of beam-shaped objects vibrating at dozens or hundreds of hertz, and it can detect small changes in the dynamic properties of these objects caused by internal defects such as fatigue cracks in real time, even when their static appearances are similar. To demonstrate the performance of the proposed 2000-fps simultaneous dynamics-based visual inspection approach, the resonant frequencies and mode shapes for beam-shaped cantilevers with different artificial cracks and weights, excited by human finger tapping, were estimated in real time.

scholarly journals Output-Only Modal Parameter Recursive Estimation of Time-Varying Structures via a Kernel Ridge Regression FS-TARMA Approach

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Zhi-Sai Ma ◽  
Li Liu ◽  
Si-Da Zhou ◽  
Lei Yu
Keyword(s):  
Parameter Estimation ◽  
Ridge Regression ◽  
Recursive Estimation ◽  
Recursive Identification ◽  
Time Varying ◽  
Modal Parameter ◽  
Kernel Ridge Regression ◽  
Output Only ◽  
Modal Parameter Estimation ◽  
Estimation Of Time

Modal parameter estimation plays an important role in vibration-based damage detection and is worth more attention and investigation, as changes in modal parameters are usually being used as damage indicators. This paper focuses on the problem of output-only modal parameter recursive estimation of time-varying structures based upon parameterized representations of the time-dependent autoregressive moving average (TARMA). A kernel ridge regression functional series TARMA (FS-TARMA) recursive identification scheme is proposed and subsequently employed for the modal parameter estimation of a numerical three-degree-of-freedom time-varying structural system and a laboratory time-varying structure consisting of a simply supported beam and a moving mass sliding on it. The proposed method is comparatively assessed against an existing recursive pseudolinear regression FS-TARMA approach via Monte Carlo experiments and shown to be capable of accurately tracking the time-varying dynamics in a recursive manner.

Application of a generalized residual model to frequency domain modal parameter estimation

2003 ◽  
Vol 262 (3) ◽  
pp. 677-705 ◽  
Author(s):  
William A. Fladung ◽  
Allyn W. Phillips ◽  
Randall J. Allemang
Keyword(s):  
Parameter Estimation ◽  
Frequency Domain ◽  
Modal Parameter ◽  
Modal Parameter Estimation

User-assisting tools for a fast frequency-domain modal parameter estimation method

2004 ◽  
Vol 18 (4) ◽  
pp. 759-780 ◽  
Author(s):  
P Verboven ◽  
B Cauberghe ◽  
E Parloo ◽  
S Vanlanduit ◽  
P Guillaume
Keyword(s):  
Parameter Estimation ◽  
Frequency Domain ◽  
Estimation Method ◽  
Modal Parameter ◽  
Parameter Estimation Method ◽  
Modal Parameter Estimation

Modal parameter estimation from input–output Fourier data using frequency-domain maximum likelihood identification

2004 ◽  
Vol 276 (3-5) ◽  
pp. 957-979 ◽  
Author(s):  
P Verboven ◽  
P Guillaume ◽  
B Cauberghe ◽  
S Vanlanduit ◽  
E Parloo
Keyword(s):  
Parameter Estimation ◽  
Maximum Likelihood ◽  
Frequency Domain ◽  
Input Output ◽  
Modal Parameter ◽  
Fourier Data ◽  
Modal Parameter Estimation
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