一次元振動インテンシティ計測における測定条件の設定

概要

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One-dimensional vibration intensity is measured at 4 points, or 2 points on the assumption of far field (called the 4- or 2-points method in the present paper). With regards to theoretical principles, the 4-points method is more accurate compared with the 2-points method, but measured value at each point includes errors. The influence of these errors upon the calculated value of vibration intensity depends on the employed method. In the present paper, errors due to difference and measurement error for both methods are examined, measurements for a beam are performed and following results are obtained. (1) The 4-points method suffers from measurement errors significantly when the product of wave number k and the space between sensors Δ is small. For precise measurement, it would be better to make kΔ large and to correct the calculated value by the factor of the finite difference error. (2) For the present apparatus, measurement can be performed well by the 4-points method, setting Δ so that kΔ is nearly 1.
一般社団法人日本機械学会の論文
1993-02-25