用全息干涉术的时间平均法测叶片的振动位移和应力

本文推导了用时间平均法测二维振动位移和应力的计算公式,结合有限单元法对某叶片一阶弯曲振动进行了计算,并将位移的计算结果与用涡流传感器直接测量的结果进行了比较。获得了用肉眼能清晰分辨的条纹级数多达40级的全息象,从而把振幅测量范围从3λ扩大到10λ以上。

Measurement of vibrational displacement and stress of a blade by time-average holographic interferometry

In this paper, the eomputative formulae used to measure 2-D vibrational displacement and stress in the time-averaged method are derived. By combining the finite element method, the computation for the first-order bending vibration of a blade has been made, and the computable displacement is compared with that, measured directly by an eddying sensor. Holograms with as many as forty orders of fringes can be clearly observed, thus expanding the measurable scope of amplitude from 3λ to 10λ.