CAJ | 학술논문

在农业机械的设计过程中,为了快速获得产品整机的模态参数,该文以某小型农业作业机为例,探讨了采用NASTRAN求解的方法获取设计结构的模态模型;采用LMS Test.Lab 试验模态分析的方法获取复杂外购件和通用件的模态模型,用自由界面模态综合的方法将通过前述方法获得的各结构模态在LMS Virtual.Lab 加中综合,最终获取整机模态模型的方法.试验证明采用该方法获得的主要固有频率最大误差小于5.5%,且振犁基本吻合.采用该方法可以在小犁农业机械的快速设计过程中,快速、准确获取整机模态参数,为在设计过程中研究产品的动态特性和进行结构优化提供了数据支撑,具有重要的工程应用价值.
재농업궤계적설계과정중,위료쾌속획득산품정궤적모태삼수,해문이모소형농업작업궤위례,탐토료채용NASTRAN구해적방법획취설계결구적모태모형;채용LMS Test.Lab 시험모태분석적방법획취복잡외구건화통용건적모태모형,용자유계면모태종합적방법장통과전술방법획득적각결구모태재LMS Virtual.Lab 가중종합,최종획취정궤모태모형적방법.시험증명채용해방법획득적주요고유빈솔최대오차소우5.5%,차진리기본문합.채용해방법가이재소리농업궤계적쾌속설계과정중,쾌속、준학획취정궤모태삼수,위재설계과정중연구산품적동태특성화진행결구우화제공료수거지탱,구유중요적공정응용개치.
Taking a certain small agricultural machine as an example for obtaining modal parameters of the whole machine during the design process of agricultural machinery. Firstly, the structural modal model for designing was studied by using NASTRAN. And then, the modal model of some complex outsoureing and general parts were studied by experimental analysis using LMS Test.Lab. Finally, the modal model of the whole machine had been obtained within LMS Virtual.Lab using free interface modal synthesis method which integrated the acquired modes of the structures. The experimental results of presented method showed that the maximum errors of the main natural frequencies were less than 5.5%, and the mode shapes were also satisfied with the experimental results. Generally, the proposed method can be applied in the fast and accurate design of small agricultural machinery for acquiring the structural modal parameters.Moreover, it also provides data support for the study of dynamic behaviors of product structure and optimizes the configuration of the design process. The proposed method clearly shows its important engineering role in agricultural machine design.