Inverse and Reciprocity Methods for Machinery Noise Source Characterization and Sound Path Quantification Part 1: Sources

Verheij, J.W.

doi:10.20855/ijav.1997.2.107

Cited by 57 publications

(15 citation statements)

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“…A comprehensive review of the development and some applications of the principle were undertaken by Fahy [12]. More recently, Verheij advocated the use of this principle to characterise sources and quantify sound paths [13].…”

Section: Reciprocitymentioning

confidence: 99%

Structure-Borne Sound Transmission From Machines in Buildings, Part 1: Indirect Measurement of Force at the Machine-Receiver Interface of a Single and Multi-Point Connected System by a Reciprocal Method

Yap

Gibbs

1999

Journal of Sound and Vibration

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Section: Reciprocitymentioning

confidence: 99%

Structure-Borne Sound Transmission From Machines in Buildings, Part 1: Indirect Measurement of Force at the Machine-Receiver Interface of a Single and Multi-Point Connected System by a Reciprocal Method

Yap

Gibbs

1999

Journal of Sound and Vibration

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“…Consequently, indirect methods have been widely studied in the literature. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The following studies are worthwhile to mention here. Verheij 1 introduced the dynamic stiffness method which seems the most straightforward approach, especially for rubber linked structures.…”

Section: Introductionmentioning

confidence: 99%

Vibration Response Prediction on Rubber Mounts with a Hybrid Approach

Uçar¹,

Basdogan²

2018

IJAV

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Accurate prediction of the vibration response at a point on a complex structure, where the operational behavior cannot be measured directly, is an important engineering problem for design optimization, component selection and condition monitoring. Identifying the exciting forces acting on the structure is a major step in the vibration response prediction (VRP). At the point where direct measurement is impossible or impractical due to physical constraints, a common approach is to identify the exciting forces based on multiplication of an inverted frequency response function (FRF) matrix and a vector of vibration responses measured at the points where the exciting forces are transmitted through. However, in some cases measuring FRFs are almost impossible. In other cases, where measuring is possible, they may be prone to significant errors. Furthermore, the inverted FRF matrix may be ill-conditioned due to the one or few modes that dominate the dynamics of the structure.In order to improve the force identification step and reduce the experimental challenges, previous studies focused on either conditioning methods or numerical models. However, conditioning methods result in additional measurements, and using only numerical models causes reduced accuracy due to incongruities between the simulation model and the real system. Considering these problems, a hybrid VRP methodology that incorporates the numerical modeling and experimental measurement results is proposed in this study. Creating an accurate numerical model and properly selecting the force identification points are the main requirements of the proposed methodology. A structure coupled with rubber mounts is used to demonstrate the proposed methodology. The numerical model includes hyperelastic and viscoelastic modeling of the rubber to represent the system behavior accurately. The selection of force identification points is based on a metric that is composed of the average condition number of the FRF matrix across the whole frequency of interest. The results show that the proposed hybrid methodology is superior to other alternative methods where predictions are solely based on numerical results or experimental measurements.

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“…It is based on subdividing the radiating surface into small areas radiating as correlated or uncorrelated monopoles and in an experimental characterisation of the monopole properties through reciprocity. The extension of the reciprocity principle to include the vibrating structure, as demonstrated by Lyamshev, is also discussed in [10] and further applications are detailed by Verheij in [12] and [13]. In the examples summarised in the above-mentioned papers it is also shown how reciprocity can be of support in developing and applying inverse force identification techniques.…”

Section: Introductionmentioning

confidence: 99%

Use of a reciprocity technique to measure the radiation efficiency of a vibrating structure

et al. 2015

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The reciprocity principle is well-known and has many applications in acoustics and vibro-acoustics. This paper discusses a reciprocity measurement method to determine the radiation efficiency of a vibrating structure. The method comprises two steps: (i) measurements of the acceleration response of the structure induced by a sound field in a reverberation chamber and (ii) measurements of the spatially-averaged squared transfer mobility of the structure. The approach is more flexible than a direct method and has the advantage that no shaker is required to excite the structure in the acoustic measurements. To demonstrate the applicability of this method, experiments were conducted on rectangular flat plates, on two components of a railway track test-rig and on three different built-up structures. For the plates and the railway rig components, comparisons are also made with theoretical models. It is shown that the measured results for each arrangement obtained using this reciprocity method provide good agreement with conventional direct measurements and with theoretical modelling. However, in most of the examples presented, the direct method has been found to be less practical and sometimes even less accurate than the reciprocal one, mostly due to the structure-shaker connection and to the inherent uncertainty of acoustic intensity measurements.

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Inverse and Reciprocity Methods for Machinery Noise Source Characterization and Sound Path Quantification Part 1: Sources

Cited by 57 publications

References 0 publications

Structure-Borne Sound Transmission From Machines in Buildings, Part 1: Indirect Measurement of Force at the Machine-Receiver Interface of a Single and Multi-Point Connected System by a Reciprocal Method

Structure-Borne Sound Transmission From Machines in Buildings, Part 1: Indirect Measurement of Force at the Machine-Receiver Interface of a Single and Multi-Point Connected System by a Reciprocal Method

Vibration Response Prediction on Rubber Mounts with a Hybrid Approach

Use of a reciprocity technique to measure the radiation efficiency of a vibrating structure

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