航空发动机转子动力优化设计软件工具研究

通过对航空发动机多转子系统的转子动力学优化模型的深入分析与研究,采用模糊数学中的正态分布的隶属函数的加权之和,对多阶临界转速相对于多个常用工作转速的分布状态进行了描述,并由此构造了目标函数;按照设计工程需要选定了对临界转速有显著影响的多个因素作为设计变量;按照设计规范的要求选定性能约束; 从而成功地建立了航空发动机转子动力学优化数学模型.在Windows98/NT平台上开发了航空发动机转子动力学优化设计软件工具.该工具可以实现多转子系统的转子动力学优化设计和整体转子的有限元变形与应力分析.以航空发动机转子为实例,验证了转子动力学优化设计软件工具在航空发动机优化设计中的应用,取得了满意的优化结果.

Aeroengine Multi-Rotors Dynamics Optimum Design--Model and Tool

Based on detail analyzed optimization model of rotor dynamics of aeroengine multi rotors system, the sum of weight of normal subjection function of fuzzy sets theory was used to describe the distribution of multi order critical rotor speeds versus multi in common used operating speeds, and to formulate an optimal objective function. According to the design specification and criterion, design variables and constraints which markedly influence the critical rotor speeds were chosen. Finally, an optimization mathematics model for rotor dynamics of aeroengines was formulated successfully. The integrated tool of aeroengine rotor dynamics was set up with VC++6.0, where Windows' I/O interface and visual post processing were implemented. The optimization algorithm was encapsulated to the form of DLL, MSC/PATRAN/NASTRAN was also integrated in it to optimize and analyze the deformation and stress for the rotor dynamics of aeroengine multi rotors. Multi rotors of an aeroengine were optimized and analyzed with this tool to examine its validity.