More than 20 dynamic characteristic experiments of rocket engine oxygen turbopump rotor with different combination of elastic support and metal-rubber damper(combined bearing) were conducted.High speed dynamic balance and repeatability check experiments of the rotor were also conducted with an optimum combined bearing.The results show that the dynamic characteristics of cantilever flexible rotor can be improved by optimum combination of elastic support and metal-rubber damper.The dynamic deflection of the rotor and the dynamic stress of the elastic support can significantly be reduced by single plane high speed dynamic balance technique

and additional unbalance caused by disassembly and assembly will not materially destroy the original balance so long as the accuracy of balancing and the quality of assembly are ensured.