Some important and creative conclusions are achieved from study as follow : 1 . through a lot of experiments , we find out the effect between two rotors " unbalanced vibrations is weak , so we can get four inner rotor ' s amplitude value from left and right bearings by trial - weight twice , and get four external rotor ' s amplitude value from left and right bearings by trial - weight twice . it is said that when get eight amplitude value and effect coefficient by trial - weight four times , we can deal with whole machine balancing for dual - rotor system with little rotating speed difference 研究发现微速差双转子系统内、外转子不平衡量之间的相互影响很小，因此可以对内转子两次试重，从左右轴承座上获得4个对应于内转子振动值；对外转子两次试重，从左右轴承座上获得4个对应于外转子振动值，即通过四次试重，获得8个振动值， 8个影响系数，就可解决该类转子的动平衡问题。
