【摘要】 以某直升机全机复杂结构为研究对象,采用有限元建立了全机动力学理论模型。该直升机前舱罩壳为有机玻璃特殊工艺成形,建模难度大,为此开展了专项试验研究。基于试验结果利用MPC技术建立了带罩壳的全机动力学计算模型。通过计算,得到前8阶模态频率误差水平为5%左右的高精度模态分析结果。更多还原

【Abstract】 The structure of one certain helicopter has been studied and the whole dynamics model is established on base of Finite element analysis(FEA). Since the front cabin shell is made of Plexiglas with complicated shape, it’s hard to be modeling. Multi-point constraints(MPC)technique of FEA is used to modeling the front cabin shell based on special experiments. By this means, the whole dynamics model with high precision is obtained, and the max error of the first 8 order model frequency of this helicopter is controlled on the level of 5%.更多还原