燃气涡轮试验与研究
燃氣渦輪試驗與研究
연기와륜시험여연구
GAS TURBINE EXPERIMENT AND RESEARCH
2012年
1期
49-53
,共5页
航空发动机%耦合双转子%响应特性%Nyquist图%阻尼
航空髮動機%耦閤雙轉子%響應特性%Nyquist圖%阻尼
항공발동궤%우합쌍전자%향응특성%Nyquist도%조니
aero-engine%coupled dual rotor%response characteristic%Nyquist chart%damp
涡扇发动机普遍采用耦合双转子结构,由于中介轴承耦合的影响及高、低压转子动力学特性的复杂性,导致转子一支承系统在设计时常无法避开所有临界转速。通过添加弹性及阻尼结构,可有效减小过临界转速时转子系统的振动。为分析耦合双转子结构过临界转速时的振动响应特性,可通过迭代法获得支点阻尼器的阻尼值,并利用过临界转速时稳态响应的Nyquist图椭圆近似特征对结果进行修正,从而得到更具参考价值的响应特性。
渦扇髮動機普遍採用耦閤雙轉子結構,由于中介軸承耦閤的影響及高、低壓轉子動力學特性的複雜性,導緻轉子一支承繫統在設計時常無法避開所有臨界轉速。通過添加彈性及阻尼結構,可有效減小過臨界轉速時轉子繫統的振動。為分析耦閤雙轉子結構過臨界轉速時的振動響應特性,可通過迭代法穫得支點阻尼器的阻尼值,併利用過臨界轉速時穩態響應的Nyquist圖橢圓近似特徵對結果進行脩正,從而得到更具參攷價值的響應特性。
와선발동궤보편채용우합쌍전자결구,유우중개축승우합적영향급고、저압전자동역학특성적복잡성,도치전자일지승계통재설계시상무법피개소유림계전속。통과첨가탄성급조니결구,가유효감소과림계전속시전자계통적진동。위분석우합쌍전자결구과림계전속시적진동향응특성,가통과질대법획득지점조니기적조니치,병이용과림계전속시은태향응적Nyquist도타원근사특정대결과진행수정,종이득도경구삼고개치적향응특성。
Dual rotor coupling structure is widely used in aero-engines. For the impact of intermediary bearing coupling and aerodynamic complexity of rotor, rotor-bearing system can' t dodge critical speed. The vibration of rotor can be effectively alleviated by adding elastic and damping structure. In order to analysis the vibration response characteristics of over critical speed, the results are corrected by combining general theory with iterative method and making use of the character that Nyquist chart looks like an ellipse when rotor works near the critical speed. So the conclusion is more approach to the true value.