CAJ | 학술논문

针对液体燃料对火箭结构的模态影响，提出采用虚拟质量法进行模态分析。首先建立了一个贮箱模型，分析了液体对结构模态的影响；然后利用该方法对一个带有液体推进剂的助推器进行了模态分析，并与集中质量法计算结果进行了比较。计算结果显示，采用虚拟质量法计算时由于液体的存在结构的频率会降低，而且虚拟质量法和集中质量法在模拟液体推进剂对结构横向一阶频率的影响时有较好的一致性，结果证明虚拟质量法作为一种模态分析方法可以为设计人员提供参考。
침대액체연료대화전결구적모태영향，제출채용허의질량법진행모태분석。수선건립료일개저상모형，분석료액체대결구모태적영향；연후이용해방법대일개대유액체추진제적조추기진행료모태분석，병여집중질량법계산결과진행료비교。계산결과현시，채용허의질량법계산시유우액체적존재결구적빈솔회강저，이차허의질량법화집중질량법재모의액체추진제대결구횡향일계빈솔적영향시유교호적일치성，결과증명허의질량법작위일충모태분석방법가이위설계인원제공삼고。
Accounting for the effect of fluid to the modal of the rocket , the virtual mass method is applied in the modal analysis of rocket booster . First, the finite element model of tank filled with water is presented for the modal analysis using virtual mass method. Then, the modal analysis of rocket booster filled with some fuel is investigated and the comparison with lumped mass method is examined. The conclusion is that the frequency of the structure filled with fluid will decreased and the virtual mass method is successful in modal analysis for the structure filled with fluid.