某涡桨发动机隔振安装系统弹性参数优化研究

目的降低某型涡桨发动机安装系统中存在的振动耦合。方法在ADAMS中建立该涡桨发动机安装系统的动力学模型,以发动机安装系统模态频率及侧向、垂向模态对应的振动解耦率为优化条件,通过ADAMS/insight模块对该动力学模型进行刚度优化。结果通过优化,发动机安装系统侧向模态频率为8.03 Hz,垂向模态频率为28.23Hz,满足隔振要求。侧向、偏航、俯仰模态实现了振动解耦,解耦率均在97%以上。由于主隔振器结构特点,垂向、航向、滚转模态仍存在振动耦合,可考虑改变主隔振器结构以降低该振动耦合。结论所述方法可提高涡桨发动机安装系统的振动解耦率,降低安装系统的刚度设计难度,进而提高涡桨发动机安装系统的隔振效率。

Optimization of Elastic Parameter of Vibration Isolation System for Turboprop Engine

Objective To reduce the vibration coupling existing in a turboprop engine mounting system. Methods A dynamic model of turboprop engine mounting system was built in ADAMS. With the vibration decoupling rate corresponding to the modal frequency, lateral and vertical modes of the engine mounting system as optimization conditions, the dynamic model was optimized by ADAMS/insight. Results The lateral mode frequency and vertical mode frequency of the engine installation system were 8.03 Hz and 28.23 Hz respectively, meeting the isolation requirements. The lateral, pitch and yaw modes all achieved vibration decoupling with decoupling rate higher than 97%. Due to structural characteristics of the main isolator, vertical, heading, roll mode vibration coupling still exists. It might be considered to alter the primary isolator structure to reduce this vibrational coupling. Conclusion The method can improve the vibration decoupling rate of turboprop engine mounting system, reduce the difficulty of rigidity design of the mounting system, and then improve the isolation efficiency of the turboprop engine mounting system.