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		任意斜裂纹转子的耦合振动研究 1)
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			STUDY ON COUPLED VIBRATIONS OF ROTOR WITH AN ARBITRARY SLANT CRACK 1)
			 
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		 图4. 裂纹深度 $a$ 对裂纹转子变刚度特性的影响  | 
	
Fig. 4. The influence of crack depth $a$ on stiffness variation characteristics of cracked rotor  | 
	
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