中文摘要：

针对转子模态参数难以有效获取的问题,进行了基于附加约束的小型涡轮增压器转子模态测试研究。以多种材料和零部件组成的某型汽油发动机涡轮增压器转子结构为例,采用有限元法构建了其有限元模型,得到自由边界条件下转子前三阶模态频率。然后分别采用卧式悬挂、立式悬挂、海绵垫、硬纸垫四种不同附加约束条件,开展转子的力锤模态测试,通过稳态图识别模态频率,与有限元仿真结果进行对比发现,采用悬挂方式较采用直接固定约束方式的识别值要低,而采用立式悬挂约束方式获得的转子模态测试综合效果最佳。

英文摘要：

As modal parameters usually were difficult to obtain for small-size turbocharger rotors, a rotor modal testing with additional constraints was proposed. A gasoline engine turbocharger rotorincluding mulii materials and components was used as the example to demonstrate the proposed ap-proach. A finite element （FE） model for turbocharger rotor with free boundary conditions was built to calculate the modal frequencies for the former three orders. Then impact modal testing wbased on four different additional constraints including horizontal hanging, vertical hanging, suppor-- ing on spongy cushion, and supporting on hardboard. The modal frequencies were evaluated from the stability diagrams. It is found the recognition values from constraint way of hanging are lower than that of the constraint way of supporting compared to the FE simulation. However, the modal frequen-cies identified under the vertical hanging constraint is the best for all kinds of constraints.