This paper presents a modeling approach for estimating time varying loads acting on a component from experimental strain measurements. The strain response of an elastic vibrating system is written as a linear superposition of strain modes. Since the strain modes, as well as the normal displacement modes, are intrinsic dynamic characteristics of a component, the dynamic loads exciting a component are estimated by measuring induced strain fields. The accuracy of the estimated loads depends on a number of factors, such as the placement locations and orientations of the gauges on the instrumented structure, as well as the number of retained modes from strain modal analysis. A solution procedure based on the construction of D-optimal designs is implemented to determine the optimum locations and orientations of strain gauges such that the variance in load estimates is minimized. A numerical as well as an experimental validation of the proposed approach through two example problems is also presented.
Load Recovery in Components Based on Dynamic Strain Measurements
Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received March 5, 2012; final manuscript received April 26, 2013; published online June 18, 2013. Assoc. Editor: Jean Zu.
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Dhingra, A. K., Hunter, T. G., and Gupta, D. K. (June 18, 2013). "Load Recovery in Components Based on Dynamic Strain Measurements." ASME. J. Vib. Acoust. October 2013; 135(5): 051020. https://doi.org/10.1115/1.4024384
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