中文摘要：

通过对27 m2大型直线振动筛及缩比为1：10的相似试验模型筛的试验模态分析,得到其幅频特性曲线并提取其中6阶固有频率,测试分析出其模态振型。根据相似理论,通过对原型筛与相似试验模型筛的固有频率对比,得出二者固有频率的相对误差小于8.62%。通过对原型筛及其相似试验模型筛的振型分析对比,发现二者各阶振型基本一致。结果表明,用模态分析法可以直观有效地得到直线振动筛的固有特性参数,为提高直线振动筛的使用寿命和可靠性以及结构优化设计提供了理论依据,证实了利用缩小比例的相似试验模型筛进行试验模态分析的有效性,验证了相似模型与原型的试验数据的一致性和可靠性。从而可知振动筛试验模型可以近似代替原型样机进行试验模态分析,对相似模型试验研究提供了参考。

英文摘要：

The six order natural frequencies are extracted from amplitude-frequency curve and modal shapes are tested through the experimental modal analysis carried out by the 1：10 scale similar test model and the prototype of 27 m2 large-scale linear vibrating screen.According to the similarity theory the relative error of the natural frequencies between the prototype of vibrating screen and the similar test model is less than 8.62%.The modal shapes of all orders are consistent between the prototype of vibrating screen and the similar test model.The results show that the inherent parameters of the linear vibrating screen can be obtained visually and effectively by using modal analysis method,which provides theoretical foundation for improving service life,reliability and structural optimization of the linear vibrating screen.The modal experimental results of the 1：10 scale similar test model are proved to be correct and valid compared with the data of the prototype of vibrating screen and the consistency and reliability of the experimental data are verified.The experimental modal analysis can be carried out by the similar test model instead of the prototype of the large-scale linear vibrating screen approximately,which provides reference for similar experimental studies.