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中文摘要：
基于动能密度和弯曲弹簧模型，提出了裂纹梁损伤识别两步法。首先，利用各测点的加速度信号计算动能密度指标，通过比较损伤前后它的变化判断裂纹位置；然后，将损伤位置和梁一阶频率代人弯曲弹簧裂纹梁模型，识别裂纹深度。通过一简支梁模型的数值算例，验证了该损伤识别方法的有效性。
英文摘要：
A two-step damage identification method of cracked beams is proposed based on the kinetic energy density and the bending spring model. First, the kinetic energy density indices of every measured points were calculated using their accelerate signals and the crack location was detected by comparing the kinetic energy density indices of the damaged beam with the same indices of the intact same, beam. Next, the damage severity was identified by the bending spring model using the crack location and the first natural frequency of the cracked beam. A simply-supported beam model was taken as the numerical analysis exemplification to demonstrate the effect of this damage identification method.
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