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Effects of Precise FRF Measurements for Frequency Based Substructuring

Sound & Vibration 2018年第1期52卷 3-7页

作者： julie harvie Peter Avitabile Structural Dynamics and Acoustic Systems Laboratory University of Massachusetts Lowell One University Avenue LowellMassachusetts 01854

Impedance modeling is often utilized to generate frequency response functions of an assembled system using modal characteristics of individual *** slight inaccuracies are manifested in the characteristics of the *** those inaccuracies may seem minor in regards to the component for a traditional modal model,the inaccuracies can be amplified when impedance modeling is *** based substructuring involves inversion of the frequency response functions and therefore requires considerable accuracy for the measurement,particularly in the area of *** this study,some aspects of frequency based substructuring were explored,namely difficulties that might be encountered in experimental testing related to drive point *** majority of studies were performed using analytical models to minimize contamination of *** study focuses on connection point measurements where the actual location might be inaccessible due to physical constraints such as hardware,holes,*** the effect of introducing slight inaccuracies to the location of the drive point measurement was studied,along with other aspects related to the accuracy of the critical connection measurement.

关键词： measurement. modal utilized

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Designing Hardware for the Boundary Condition Round Robin Challenge

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Sound & Vibration 2018年第1期52卷 9-12页

作者： David E.Soine Richard J.Jones julie M.harvie Troy J.Skousen Tyler F.Schoenherr Kansas City National Security Campus* 14520 Botts RoadKansas CityMissouriUSA Sandia National Laboratories P.O.Box 5800-MS 0840AlbuquerqueNM 87185

Qualification of products to their vibration and shock requirements in a laboratory setting consists of two basic *** first is the quantification of the product’s mechanical environment in the *** second is the process of testing the product in the laboratory to ensure it is robust enough to survive the field *** latter part is the subject of the“Boundary Condition for Component Qualification”challenge *** paper describes the challenges in determining the appropriate boundary conditions and input stimulus required to qualify the *** paper also describes the step sand analyses that were taken to design a set of hardware that demonstrates the issue and can be used by round robin challenge participants to investigate the problem.

关键词： field. Boundary Robin

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