CAJ | 학술논문

以轿车白车身为研究对象,基于前处理软件Hypermesh和有限元分析软件MSC.Nastran,应用有限元分析理论,建立了白车身有限元模型.通过有限元模态分析和试验模态分析的方法,分别得到白车身的固有频率、相应的振型等模态参数.将试验结果与理论分析结果进行对比,验证了白车身有限元模型的有效性.从振动、强度角度考虑,分析了该白车身所承受内外激励的影响.根据应变模态的局域性特点,提出利用有限元模型各阶模态应变能分布,确定车身结构弹性变形最大位置的方法,有针对性地加强车身的局部刚度.结果表明,该方法具有较好的实际工程应用价值.
이교차백차신위연구대상,기우전처리연건Hypermesh화유한원분석연건MSC.Nastran,응용유한원분석이론,건립료백차신유한원모형.통과유한원모태분석화시험모태분석적방법,분별득도백차신적고유빈솔、상응적진형등모태삼수.장시험결과여이론분석결과진행대비,험증료백차신유한원모형적유효성.종진동、강도각도고필,분석료해백차신소승수내외격려적영향.근거응변모태적국역성특점,제출이용유한원모형각계모태응변능분포,학정차신결구탄성변형최대위치적방법,유침대성지가강차신적국부강도.결과표명,해방법구유교호적실제공정응용개치.
Using preprocessing software Hypermesh and FEA software MSC.Nastran, the detailed finite element model of car body-in-white (BIW) was established based on the theory of finite element. Finite element modal analysis and experimental modal analysis were conducted to get the modal parameters of BIW , including natural frequencies and corresponding mode shapes respectively. With comparison of the result of the simulation with that of test, the validity of the FEA model was verified. From the view of vibration and strength, the impact of internal and external incentives on the BIW was analyzed. According to strain mode local characteristics, a new method to determine the position where the maximum elastic deformation takes place by using the strain energy distribution of the vibration modes of different orders was therefore proposed. The method can be used to improve the local rigidity of BIW. The result shows that this method is reasonable and practical for the car body design.