CAJ | 학술논문

大型汽轮机排汽缸轴承通常采用座缸式。将轴承支撑特性用参振质量和支撑刚度表示，油膜特性用八个刚度和阻尼系数表示，建立了考虑支撑刚度影响后的等效分析模型。计算结果表明，座缸式轴承振动受支撑特性影响较大。支撑刚度不仅会影响系统等效刚度，也会对系统等效阻尼产生较大影响。不同支撑刚度下转子-轴承系统所表现出来的绝对轴振、相对轴振和轴承座振动特性不同。支撑刚度较低时，轴振和瓦振之间的相位差较大，根据三者幅值和相位之间的关系可以评估支撑刚度特性，监测座缸式轴承的绝对轴振比相对轴振更有意义。排汽缸轴承振动对转子不平衡很敏感，可以通过精细动平衡减小振动。
대형기륜궤배기항축승통상채용좌항식。장축승지탱특성용삼진질량화지탱강도표시，유막특성용팔개강도화조니계수표시，건립료고필지탱강도영향후적등효분석모형。계산결과표명，좌항식축승진동수지탱특성영향교대。지탱강도불부회영향계통등효강도，야회대계통등효조니산생교대영향。불동지탱강도하전자-축승계통소표현출래적절대축진、상대축진화축승좌진동특성불동。지탱강도교저시，축진화와진지간적상위차교대，근거삼자폭치화상위지간적관계가이평고지탱강도특성，감측좌항식축승적절대축진비상대축진경유의의。배기항축승진동대전자불평형흔민감，가이통과정세동평형감소진동。
The mode of bearing on exhaust cylinder is often used in large turbine unit.An equivalent analysis model was set up to consider the influence of support pedestal stiffness.The support system was modeled as a mass-spring structure and the bearing oil film as eight stiffness and damping coefficients.There is great influence of support pedestal stiffness on the vibration of bearing on turbine exhaust cylinder.The relationships among absolute shaft vibration,relative shaft vibration and bearing vibration are different in different support stiffness cases.If the support stiffness is low,the phase difference between shaft vibration and bearing vibration may be large.The support stiffness characteristics can be evaluated from the three kinds of vibration signals.Absolute shaft vibration monitoring is more important for bearing on exhaust cylinder than that of relative shaft vibration.Vibration of bearing on cylinder is sensitive to rotor unbalance. Accurate balance is effective to reduce the vibration of this kind of system.