On Modeling Structural Excitations by Low Speed Turbulent Boundary Layer Flows

Hwang, Y. F.; Bonness, William K.; Hambric, Stephen A.

doi:10.21236/ada465806

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…For the sake of brevity, these models are not presented here, but detailed reviews and discussions about TBL models can be found in Refs. [21], [22] and [23]. Finally, the parameters of the TBL models used in this article are those proposed by their authors, except for the Corcos model, whose parameters are defined from measurements presented in Fig.…”

Section: Versatility Of Sstmentioning

confidence: 99%

Source Scanning Technique for Simulating TBL-Induced Vibrations Measurements

Aucejo

Maxit

Guyader

2014

Flinovia - Flow Induced Noise and Vibration Issues and Aspects

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Measuring the vibro-acoustic response of structures subjected to a turbulent boundary layer (TBL) excitation in operating conditions remains an open issue for experimenters. Generally, in situ measurements, e.g. flight tests, underwater measurements and wind tunnel measurements are carried out, although they require expensive facilities. As an alternative to in situ measurements, experimental simulations in a laboratory environment have been developed. The main issue of these substitute experiments is the synthesis of an excitation field equivalent to TBL wallpressure fluctuations with the help of standard transducers (shakers, loudspeakers, etc.). In the present paper, we propose an alternate off-line methodology to deal with the experimental simulation of vibrations induced by a spatially correlated random pressure field, such as TBL excitation. The proposed methodology is called Source Scanning Technique (SST) and relies on two main features: a wall-pressure plane wave expansion of the target random wall-pressure field and two identification steps based on the concept of synthetic array to simulate TBL-induced vibrations from a set of transfer functions. In the present paper, the theoretical description of the SST and its experimental implementation are detailed.

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Section: Versatility Of Sstmentioning

confidence: 99%

Source Scanning Technique for Simulating TBL-Induced Vibrations Measurements

Aucejo

Maxit

Guyader

2014

Flinovia - Flow Induced Noise and Vibration Issues and Aspects

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“…Under the assumptions of stationarity and homogeneity, TBL excitation is thus represented by its crossspectral density (CSD) function. In the literature, numerous models are available, such as Corcos-like [17,18,19,20] or Chase-like [21,22,23,24] models, for describing TBL wall pressure fluctuations on a rigid plane. These models can be then directly used to determine the statistical properties of the response of a structure, such as a panel, thanks to the random vibration theory [25,26].…”

Section: Basic Concept: the Uncorrelated Wall Pressure Plane Wavesmentioning

confidence: 99%

“…For the sake of brevity, these models are not presented here, but detailed reviews and discussions about TBL models can be found in Refs. [24], [34] and [35]. Finally, the parameters of the TBL models used in this article are those proposed by their authors, except for the Corcos model, whose parameters are defined in table 1.…”

Section: Semi-analytical Validation Of Tbl Induced Vibrationmentioning

confidence: 99%

Experimental simulation of turbulent boundary layer induced vibrations by using a synthetic array

Aucejo

Maxit

Guyader

2012

Journal of Sound and Vibration

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Of particular interest is the experimental feasibility of replacing wind tunnel measurements with a substitute experiment to simulate Turbulent Boundary Layer (TBL) induced vibrations. This paper describes the development of an experimental procedure to address this issue. The proposed approach is based on the concept of uncorrelated wall pressure plane waves, which is introduced as a prelude to this study. Concretely, an array of acoustic monopoles can be used to generate these wall pressure plane waves. To this end, the design parameters of the array are studied numerically. However, when dealing with experimental applications, the number of monopoles required being prohibitive, the principle of synthetic array is applied instead. This technique allows simulating the effect of an array of acoustic monopoles from sequential measurements. To assess the validity of the proposed approach, the whole procedure is applied to simulate TBL induced vibrations of a thin elastic plate. The results obtained are in good agreement with those

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“…Many investigators have proposed empirical models of j pp (o) and G(D 1 ,D 3 ,o) for TBL flow fields with zero mean pressure gradient [see Hwang et al (2003Hwang et al ( , 2009), Graham (1997) for summaries of some of the more popular models]. The models are effectively curve fits of measured data for geometrically similar flow fields, where the data are collapsed on the so-called inner, outer, or mixed flow variables.…”

Section: Tbl Flow Excitationmentioning

confidence: 99%

“…(18) usually overestimates the low-wavenumber region of the TBL wall pressures. Ko (1991) and Hwang et al (2003) have evaluated a modification to the Corcos model, where…”

Section: Cross-spectramentioning

confidence: 99%