The structural form of welding the low-pressure rotor bearing seat and low-pressure outer cylinder as a whole is widely used in large steam turbine generator units,which is causing some common vibration problems in the low-pressure cylinder rotor bearing system.The vibration fault characteristics of this type were diagnosed by combining the structural characteristics of the low-pressure cylinder bearing system and operating parameters.It has been clarified that the cause of vibration is due to unbalanced rotor mass,low overall stiffness of low-pressure cylinder,weak dynamic stiffness of low-pressure cylinder bearing seat support.On site measures such as fine dynamic balancing and reinforcement of low-pressure cylinder body can be taken to eliminate the vibration fault of the low-pressure cylinder of this type of unit.These measures have been successfully applied in engineering practice,which provide guidance for the analysis and treatment of similar vibration problems.
关键词
座缸式轴承/激振力/刚度/动平衡/有限元分析
Key words
seat cylinder bearing/excitation force/rigidity/dynamic balance/finite element analysis
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