【摘要】：基于應力強度因子為零法,建立了汽輪機轉(zhuǎn)子升速過程中開裂紋轉(zhuǎn)子和呼吸型裂紋轉(zhuǎn)子的振動模型,并采用Runge-Kutta法對模型進行數(shù)值積分,實現(xiàn)升速過程中2種轉(zhuǎn)子的穩(wěn)態(tài)響應數(shù)字仿真及穩(wěn)定性量化分析。結果表明:開裂紋轉(zhuǎn)子和呼吸型裂紋轉(zhuǎn)子在升速過程中均存在明顯的1/3階和1/2階超諧共振;在超臨界轉(zhuǎn)速區(qū),開裂紋轉(zhuǎn)子和呼吸型裂紋轉(zhuǎn)子均在轉(zhuǎn)速比p=ω/ω0=2.10、2.20、2.55處出現(xiàn)了亞諧共振,該現(xiàn)象可作為判斷轉(zhuǎn)子裂紋故障是否存在的依據(jù);在不同轉(zhuǎn)速區(qū),呼吸型裂紋轉(zhuǎn)子與開裂紋轉(zhuǎn)子的表現(xiàn)各不相同,尤其在超臨界轉(zhuǎn)速區(qū),質(zhì)量偏心e進一步抵消裂紋引起的非線性失穩(wěn),呼吸型裂紋轉(zhuǎn)子出現(xiàn)局部漸進穩(wěn)定區(qū)域,特別是在0.8e1.6時,質(zhì)量偏心會進一步抑制非線性失穩(wěn)運動,這一現(xiàn)象可為裂紋轉(zhuǎn)子非線性運動失穩(wěn)控制提供理論依據(jù)。
[Abstract]:Based on the zero stress intensity factor (SIF) method, the vibration models of cracked rotor and respiratory cracked rotor are established, and the numerical integration of the model is carried out by using Runge-Kutta method. The steady state response digital simulation and stability quantification analysis of two kinds of rotors are realized in the process of raising speed. The results show that there are obvious 1 / 3 order and 1 / 2 order super harmonic resonance in the speed raising process of the open crack rotor and the respiratory crack rotor. In the supercritical speed region, both cracked rotor and respiratory cracked rotor appear subharmonic resonance at the speed ratio of p = 蠅 / 蠅 _ 0 / 2.10 ~ 2.20 ~ 2.55. This phenomenon can be used as a basis for judging the existence of crack fault of rotor. In different speed regions, the behavior of respiratory cracked rotor is different from that of open crack rotor, especially in supercritical speed region, mass eccentricity further counteracts the nonlinear instability caused by crack, and there is a local gradual stability region in respiratory cracked rotor. Especially in 0.8e1.6, mass eccentricity will further suppress nonlinear instability motion, which can provide theoretical basis for nonlinear motion control of cracked rotor.
【作者單位】： 華北電力大學能源動力與機械工程學院;華北電力大學數(shù)理學院;
【基金】：國家自然科學基金項目(11402087)
【分類號】：TK263.61
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本文編號：2350310