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Optimization of Strain Gauge Position on Blades for Vibration Measurement
Choi, Byeong-Keun,Mignolet, Marc P. 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-
This paper focuses on the formulation and validation of an automatic strategy for the selection of the locations and directions of strain gauges to capture at best the modal response of a blade in a series of modes. These locations and directions are selected to render the strain measurements as robust as possible with respect to random mispositioning of the gauges and gauge failures. The approach relies on the evaluation of the signal-lo-noise ratios of the gauge measurements from finite element strain data and includes the effects of gauge size. A genetic algorithm is used to find the strain gauge locations-directions that lead to the largest possible value of the smallest modal strain signal-to-noise ratio, in the absence of gauge failure, or of its expected value when gauge failure is possible. A fan blade is used to exemplify the applicability of the proposed methodology and to demonstrate the effects of the essential parameters of the problem, i.e. the mispositioning level, the probability of gauge failure, and the number of gauges.
Pattern Optimization of Intentional Mistuning for Bladed dik by Genetic Algorithm
Choi, Byeong-Keun,Mignolet, Marc P. 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-
The focus of the present investigation is on the use of intentional mistuning of bladed disks to reduce their sensitivity to unintentional random mistuning. A two-step procedure is then described to optimize the arrangement of these blades around the disk to reduce the effects of unintentional mistuning. First, a pure optimization effort is undertaken to obtain the pattern(s) of the A and B blades that yields small/the smallest value of the largest amplitude of response to a given excitation in the absence of unintentional mistuning using Genetic Algorithm. Then, in the second step, a qualitative/quantitative estimate of the sensitivity for the optimized intentionally mistuned bladed disks with respect to unintentional mistuning is performed by analyzing their forced response, amplification factor, probability density function and passband/stopband structures. Examples of application involving simple bladed disk models demonstrate the significant benefits of using this class of intentionally mistuned disks.