【摘要】 从颤振的角度讨论了空气动力(包括升力和力矩)对振动的影响.该实验模型采用二维截断模型.为了完成模型的纯弯和扭转单自由度强迫振动实验,专门设计了一套强迫振动机构,并用计算机采集和处理数据.然后利用模型的纯弯和扭转单自由度强迫振动实验得出了颤振导数,绘出颤振导数随无量纲风速K变化的曲线图,较好地描述了其随无量纲风速K的变化规律.更多还原

【Abstract】 Vibrational mode dependence on the aerodynamic fo rces (lift force, pitching moment) was discussed from flutter aspect.A two-dim ensional truncation model was used in this experiment. In order to accomplish ve rtical bend and torsion movement, a forced-vibrati on equipment was specifically designed. Through disposing the model in the force d-oscillation, vertical bend and to rsion, the flutter derivatives can be obtained by sampling and dealing with comp uter. Then we plotted flutter derivatives versus dimensionless wind speed K accord ing to the datum, which displays the change law of flutter derivatives versus di mensionless wind speed K.更多还原