In situ measurement of the blocked force of structure-borne sound sources

Moorhouse, Andy; Elliott, AS; Evans, Trefor A.

doi:10.1016/j.jsv.2009.04.035

Cited by 114 publications

(43 citation statements)

References 9 publications

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“…Recent studies (Lennström et al, 2016;Moorhouse et al, 2009;Van den Bosch et al, 2014) have highlighted the validity of "in-situ" measurements of the interface forces, fi. For the current study, the motor remained mounted to the vehicle body and, thus, the interface forces are correctly termed "blocked" forces.…”

Section: Transfer Path Analysismentioning

confidence: 99%

Comparison between transfer path analysis methods on an electric vehicle

et al. 2017

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A comparison between transfer path analysis and operational path analysis methods using an electric vehicle is presented in this study. Structure-borne noise paths to the cabin from different engine and suspension points have been considered. To realise these methods, two types of test have been performed; operational tests on a rolling road and hammer tests in static conditions. The main aim of this work is assessing the critical paths which are transmitting the structure-borne vibrations from the electric vehicle's vibration sources to the driver's ear. This assessment includes the analysis of the noise contribution of each path depending on the frequency and vehicle speed range and moreover, the assessment of the path noise impact for harmonic orders which arise due to the physical components of the electric vehicle. Furthermore, the applicability of these methods to electric vehicles is assessed as these techniques have been extensively used for vehicles powered with internal combustion engines

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Section: Transfer Path Analysismentioning

confidence: 99%

Comparison between transfer path analysis methods on an electric vehicle

et al. 2017

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“…As before we replace the excitation at b i with the equivalent excitation, i.e., the blocked force distribution f ðsÞ ðb i Þ applied to the interface. 13,14 The velocity at the same points as before can thus be re-expressed in terms of an integration over the interface…”

Section: B Extension To Continuous Interfaces and Arbitrary Sub-domainsmentioning

confidence: 99%

The “round trip” theory for reconstruction of Green's functions at passive locations

Moorhouse

Elliott

2013

The Journal of the Acoustical Society of America

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An expression for the Green's function at an arbitrary set of passive locations (no applied force) is derived and validated by experiment. Three sets of points are involved, the passive reconstruction points, c, which lie on a virtual boundary and two sets of auxiliary points, denoted a and b, located either side. The reconstruction is achieved using Green's functions forming a "round trip" from and to the reconstruction points via a and b. A two stage measurement procedure is described involving excitation at b and a but with no excitation required at the reconstruction points. A known "round trip" relationship is first introduced which is theoretically exact for points on a multi-point interface between two linear, time invariant subsystems. Experimental results for frequency response functions of a beam-plate structure show that this relationship gives good results in practice. It is then shown that the theory provides an Nth order approximation for the Green's function at arbitrary points, where N is the number of points at b. The expression is validated by reconstructing point and transfer frequency response functions at two passive points on an aluminum plate.

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“…For rigidly mounted machines an in situ measurement method has been proposed for measurement of blocked forces [3] and several case studies have confirmed both the practicality of the required measurements and the reliability of the results [4], [5], [6]. This approach has not to date been standardized but has been taken up in several industries.…”

Section: Active Propertiesmentioning

confidence: 99%