An Indicator Sensor Criterion for In-Situ Characterisation of Source Vibrations

Wernsen, M. W. F.; Seijs, M. V. van der; Klerk, D. de

doi:10.1007/978-3-319-54987-3_7

Cited by 10 publications

(11 citation statements)

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“…The ill-posed nature of the inverse force synthesis problem requires special care to improve the conditioning. Experimentally, this relates to sensor placement and sensor quantity [8] with additional constraints imposed by the selected measurement approach. For better readability of Figure 2, both factors (placement and quantity), are generalized with respect to the associated sensor arrangement.…”

Section: Considerations On Sensor Arrangementmentioning

confidence: 99%

“…The location (fully or partially coinciding with the coupling interface DoF) and the number (degree of over-determination) of the indicator DoF at which such input data is measured, significantly influence the solution of the generally ill-posed inverse problem. In recent work, guidelines for instrumentation to reduce uncertainty are given in [8], and [9] provides a framework for the evaluation of uncertainties in blocked forces. However, application of this framework is as yet nonstandard.…”

Section: Introductionmentioning

confidence: 99%

“…(4)). The indicator positions of the employed transfer mobilities are located further away from the active source component, resulting in a higher resemblance of the remote response and a loss of phase information[8]. This resemblance is indicated by a higher condition number of the non-collocated mobility matrix , for assembly (C), illustrated inFigure 8.…”

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confidence: 99%

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Robust NVH Engineering Using Experimental Methods - Source Characterization Techniques for Component Transfer Path Analysis and Virtual Acoustic Prototyping

Wienen¹,

Sturm²,

Moorhouse³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

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A major challenge in automotive NVH engineering is to approach complex structure-borne sound and vibration problems with sufficient accuracy but reasonable experimental effort. Typical issues encountered are poor correlation between objective component performance criteria tested for during bench validation and corresponding subjective targets evaluated during system validation in the actual vehicle. Additional challenges arise from the need to impose assumptions on sophisticated physical vibration problems to reduce the complexity to a level feasible for conventional experimental test methods. This paper addresses all mentioned issues by elaborating on a system NVH engineering approach employing Virtual Acoustic Prototyping (VAP) (related to what is now often called component Transfer Path Analysis) to synthesize time domain sound and vibration responses of vibrating machinery operated in a virtual vehicle environment. One crucial step of VAP is to characterize the strength of vibrating machinery by independent quantities at the significant coupling degrees of freedom (DoF). This study puts special focus on the measurement of free velocity, suitable for machinery operated when resiliently mounted as per ISO 9611, and the in-situ measurement of blocked forces, applicable for sources connected to any type of receiving structure during operation, as per ISO/DIS 20270. In order to reduce complexity of the underlying measurements this paper investigates the possibility of using collocated sensor arrays and methods to validate assumptions imposed to abstract away from rotational coupling DoF. An electric power steering (EPS) system inducing vibrations into a sub-frametype structure is considered as a representative automotive sourcereceiver installation to investigate the feasibility of free velocity and in-situ blocked force approach with respect to independent source characterization for component Transfer Path Analysis (TPA) and VAP. The obtained Virtual Acoustic Prototype is expanded using an algorithm to synthesize realistic time domain data, enabling NVH engineers to conduct reliable objective and subjective design evaluations.

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Section: Considerations On Sensor Arrangementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Robust NVH Engineering Using Experimental Methods - Source Characterization Techniques for Component Transfer Path Analysis and Virtual Acoustic Prototyping

Wienen¹,

Sturm²,

Moorhouse³

et al. 2019

SAE Int. J. Adv. & Curr. Prac. in Mobility

View full text Add to dashboard Cite

show abstract

“…Many works can be found addressing this issue, particularly with regards to the suppression of its effects through methods such as regularisation [37,38]. In this field it appears to have become common practice to associate the condition number of measured FRF matrices with the degree of error, or uncertainty, as a result of ill-conditioning [39,40]. Whilst the condition number may indicate a rank deficiency, and thus the potential for ill-conditioning, in the presence of a realistic experimental uncertainty, it is not clear whether the condition number is an appropriate indicator of uncertainty.…”

Section: Introductionmentioning

confidence: 99%

“…Whilst the full posterior probability distribution of the reconstructed force is found, as per the Bayesian paradigm, some prior distribution must be elicited, which itself is not a trivial task. In [40] Wernsen et al consider the effect of sensor noise, as opposed to FRF uncertainty, on the determination of blocked forces and discuss the importance of sensor positioning when preforming inverse force identification procedures.…”

Section: Introductionmentioning

confidence: 99%