CAJ | 학술논문

轴向裂纹的存在而导致了圆柱薄壳在裂纹附近区域的局部振动,其动态特性发生了显著的变化。采用有限元方法研究了轴向裂纹尺寸对薄壳固有频率以及振型的影响规律,研究了局部振动具有自己的固有频率与独特的振型及其随裂纹长度变化的规律,解释了在相同的壳体原有振动中有可能出现裂纹长度增加而固有频率却反而上升的现象。将计算结果与实验结果进行了对比,二者吻合较好。
축향렬문적존재이도치료원주박각재렬문부근구역적국부진동,기동태특성발생료현저적변화。채용유한원방법연구료축향렬문척촌대박각고유빈솔이급진형적영향규률,연구료국부진동구유자기적고유빈솔여독특적진형급기수렬문장도변화적규률,해석료재상동적각체원유진동중유가능출현렬문장도증가이고유빈솔각반이상승적현상。장계산결과여실험결과진행료대비,이자문합교호。
Tile existence of the axial crack on the thin cylindrical shell led to the local vibration around the crack, which caused the significant change of its natural frequency and dynamic characteristic. The FEM was used to analyze the influences of axial crack sizes on the natural frequencies and modal shapes of the cylindrical shell, and the local vibration＇s natural frequencies and modal shapes varied with the crack length changed. The paper also explained the phenomenon that there might be increase of the crack length in the similar shell original vibration, while the natural frequency will rise. The comparison between the results from the calculation of the FEM and the results from the experiment shows that the two results match each other approximately.