论文部分内容阅读
HAJIF-Ⅱ是中国航空研究院领导研制的航空结构动力分析系统。它可以进行结构的固有动力特性计算,以及带主动控制系统的飞机颤振计算和突风响应计算。它具有31条固定流程、2600条FORTRAN语句。允许使用99个原级子结构,每个子结构的自由度数可达7000。颤振计算和突风响应计算中,可以使用50个形态。非定常空气动力计算的分块数可达300个。在刚度矩阵和质量矩阵的管理上,采用超元矩阵方法做“宏观处理”,并用有效列方法做“微观处理”,发展了新的同时迭代算法,以提高实特征值计算的效率。设计了比较完整的形态综合法计算程序,除固定界面法和自由界面法之外,还发展了分级综合和逐步综合的新方法。非定常空气动力计算方面,引入了用曲线拟合方法把谐振荡空气动力转入拉氏平面的技术。用本系统计算了一批典型的结构,取得了良好结果。
HAJIF-Ⅱ is a structural aerodynamic analysis system developed by China Aeronautical Research Institute. It can be used to calculate the inherent dynamic characteristics of the structure, as well as the aircraft flutter calculation and gust response calculation with active control system. It has 31 fixed processes, 2600 FORTRAN statements. The 99 primary-level substructures are allowed, with a number of degrees of freedom of up to 7,000 for each substructure. In flutter calculations and gust response calculations, 50 morphologies can be used. Unsteady aerodynamic calculation of the number of blocks up to 300. In the management of stiffness matrix and mass matrix, we use the super-element matrix method to do the “macro-processing” and use the effective column method to do “micro-processing” to develop a new simultaneous iterative algorithm to improve the efficiency of the real eigenvalue calculation. In addition to the fixed interface method and free interface method, a new method of grading synthesis and gradual synthesis has been developed. In the unsteady aerodynamic calculation, a technique of curve-fitting the harmonic oscillating aerodynamics into the Laplace plane is introduced. A number of typical structures have been calculated by this system and good results have been achieved.