农机扶手有限元正交优化方法及应用

Optimization Method of Agricultural Machinery Handle Based on FEA and Orthogonal Experimental Design

针对复杂参数结构优化过程中模态分析方案过多问题,结合模态分析和正交试验法的特点,提出有限元正交优化分析方法,通过对结构有限元模态分析方案的正交试验规划,大幅度减少分析样本数量;同时试验数据的分析结果可确定各试验因素的较好水平及各因素对振动性能的影响,通过改变敏感参数来快速实现机械结构振动特性的改变。最后以小型农机扶手为例,将扶手的一阶振动频率由41.7Hz变为71.379 Hz,避开了人手的敏感频率范围,优化及试验结果证明了该方法的有效性及可行性。

In view of the problem of excessive modal analysis schemes in the optimization process of complex parameter structure, an optimization method based on FEA with orthogonal design is proposed by combining the features of modal analysis and orthogonal test. Through the orthogonal test plan for the finite element modal analysis scheme of structure, the number of analysis samples is greatly reduced, moreover the analysis results of test data can determine better level of various test factors and the influence of the factors upon the vibration performance, thereby the vibration characteristics of mechanical structure can be quickly changed by changing the sensitive parameters. Finally, the handle of a small agricultural machine is taken as an example, the first order vibration frequency is changed from 41.7 Hz to 71.379 Hz, thus keeping off the sensitive frequency range of hand. The optimization and test results prove the validity and feasibility of that method.