Uncertainty quantification in experimental frequency based substructuring

“…In more recent years the literature concerning FRF uncertainty has been driven by an interest in the fields of dynamic sub-structuring, modal analysis, and transfer path analysis. It has been shown that inconsistencies in measured FRF matrices can lead to: the extraction of incorrect modal parameters [25], spurious peaks in sub-structured FRF predictions [26,27,28], and large errors in reconstructed force estimates [29]. These examples further highlight the need to establish suitable methods for the treatment of uncertainty in experimental structural dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…Interested in the effect of FRF uncertainty on dynamic sub-structuring procedures, de Klerk and Visser [30] attempted to characterise the experimental error associated with inconsistent excitation and response orientation, particularly in the measurement of driving point FRFs. The authors subsequently proposed an uncertainty propagation procedure for use in the prediction of coupled assembly FRFs [31,27]. Although the authors considered the separation of real and imaginary components using a complex matrix mapping, they chose not to account for their possible correlation, nor the correlation between the individual elements of the FRF matrix.…”

Section: Introductionmentioning

confidence: 99%

A covariance based framework for the propagation of uncertainty through inverse problems with an application to force identification

Meggitt

Moorhouse

Elliott

2019

Mechanical Systems and Signal Processing

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“…A detailed discussion on this issue was presented by Voormeeren and Rixen [21]. The influence of the uncertainties in the measurements of vibration time histories of substructures on interpreted FRFs was studied by Voormeeren et al [22]. Statistical moment method was used to quantify the propagated uncertainties in the coupled system's FRFs.…”

Section: Introductionmentioning

confidence: 99%

A receptance-based method for frequency assignment via coupling of subsystems

Tsai

Chang

2019

Arch Appl Mech

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This paper presents a theoretical study of the frequency assignment problem of a coupled system via structural modification of one of its subsystems. It deals with the issue in which the available modifications are not simple; for example, they are not point masses, grounded springs, or spring-mass oscillators. The proposed technique is derived based on receptance coupling technique and formulated as an optimization problem. Only a few receptances at the connection ends of each subsystem are required in the structural modification process. The applicability of the technique is demonstrated on a simulated rotor system. The results show that both bending natural frequencies and torsional natural frequencies can be assigned using a modifiable joint, either separately or simultaneously. In addition, an extension is made on a previously proposed torsional receptance measurement technique to estimate the rotational receptance in bending. Numerical simulations suggest that the extended technique is able to produce accurate estimations and thus is appropriate for this frequency assignment problem of concern.

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Uncertainty quantification in experimental frequency based substructuring

Cited by 44 publications

References 13 publications

Vibration source description in substructuring: A theoretical depiction

Vibration source description in substructuring: A theoretical depiction

A covariance based framework for the propagation of uncertainty through inverse problems with an application to force identification

A receptance-based method for frequency assignment via coupling of subsystems

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