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航空回转机械,如压气机的叶片,经常要进行所谓“修频”的工序,使叶片的固有频率在规范要求的频段内。在叶片型面的节线附近,或者在叶片端部及远离节线的波腹刮掉一些金属,对固有频率的数值影响如何?其规律又是怎样呢?这是一个很有实际意义的课题。为了找出“修频”的规律,使理论与实验较好的一致,我们以平板叶片作为研究对象。一般“修频”均是平行根部条状刮掉一些金属,这是一个变截面悬臂薄板的振动特性计算问题。显而易见,采用有限条法颇为有利,计算结果精确、占用内存少、机时省。本文进一步采用解耦有限条法计算,完全可以在微型机上进行,适用于工厂中与实验方法配合使用。
Air rotary machinery, such as the compressor blades, often have to carry out the so-called “frequency repair” process, so that the natural frequency of the blade in the frequency band required by the specification. In the blade surface near the nodal line, or at the blade end and away from the nodal anomaly to scrape off some of the metal, the natural frequency of the numerical impact on how? The law is what? This is a very practical topic . In order to find out the rule of “frequency-tuning” and make the theory and experiment agree well, we take the flat blade as the research object. The general “frequency repair” are parallel to the root strip scraping some metal, which is a variable cross-section cantilever thin plate vibration characteristics of the calculation. Obviously, the use of finite strip method is quite advantageous, accurate calculation, less memory, machine time saving. In this paper, the decoupling finite strip method is further used to calculate, which can be carried out on a microcomputer. It is suitable for the factory to be used together with the experimental method.