CAJ | 학술논문

大型复杂航天器结构有限元模型的合理性和准确性在航天器研制过程中具有重要意义,它是开展星箭耦合分析以及力学环境条件设计等工作的基础.首先综合有限元建模、模态试验、相关分析和模型修正等技术构造了一套系统的航天器结构有限元模型试验验证策略;然后,针对我国新一代大型卫星平台--东方红四号卫星开展了整星有限元模型的试验验证研究,其中整星模态试验以及模型修正等研究工作属首次在东方红四号卫星平台上成功实施.修正后有限元模型对整星主模态频率预测误差小于5%,模态置信准则大于0.6,预示精度达到工程要求.
대형복잡항천기결구유한원모형적합이성화준학성재항천기연제과정중구유중요의의,타시개전성전우합분석이급역학배경조건설계등공작적기출.수선종합유한원건모、모태시험、상관분석화모형수정등기술구조료일투계통적항천기결구유한원모형시험험증책략;연후,침대아국신일대대형위성평태--동방홍사호위성개전료정성유한원모형적시험험증연구,기중정성모태시험이급모형수정등연구공작속수차재동방홍사호위성평태상성공실시.수정후유한원모형대정성주모태빈솔예측오차소우5%,모태치신준칙대우0.6,예시정도체도공정요구.
Precise finite element model plays a key role in the design of large complex spacecraft such as satellite. It provides the research platform for coupled load analysis and mechanical environment predication. A systematic model verification strategy consisted of finite element modeling, modal test, correlation analysis and model updating is proposed in this paper. The strategy is then applied in the model verification of DFH-4. Among all the presented researches, modal test and model updating are supposedly to be first time successfully implemented on the DFH-4. After updating, the verified finite element model is able to accurately reproduce measured modal data. Frequency deviations between experiment and updated model are less than 5%. The modal assurance criteria of the concerned modes also increase obviously.