由轴颈扬度计算汽轮发电机组轴承载荷分布方法  

Method to Calculate Turbine Generator Unit Bearing Load Distribution Using Journal Raising Rate

作　　者：高庆水[1] 张楚[1] 邓小文[1] 杨建刚[2] 

机构地区：[1]广东电网公司电力科学研究院,广州510080 [2]东南大学火电机组振动国家工程研究中心,南京210096

出　　处：《机械工程学报》2013年第11期84-88,共5页Journal of Mechanical Engineering

摘　　要：在传递矩阵基础上,提出一种由轴颈扬度分布递推计算汽轮发电机组轴系各轴承载荷分配方法。在轴承处将轴拆分为若干段,任意一个轴段内两端轴颈扬度差值取决于轴段内弯矩、剪力、轴段参数和轴承载荷。第1个轴承左端截面弯矩和剪力可以由力和力矩平衡方程直接求出。由该值和前2个轴承轴颈扬度值可以求出第1个轴承载荷,进而求出第2个轴承左端截面弯矩和剪力。将该方法递推应用到其后更多轴段,即可逐步求出各轴承载荷。在转子试验台上就轴系两种对中状况下的轴承载荷分配进行测试,并与顶举法测试结果进行比较,验证本方法的可行性。将该方法应用于某台大型汽轮发电机组轴承载荷分布识别。该方法是一种整体识别法,可以应用于联轴器螺栓不解体情况下轴系对中状况分析。A new bearing load distribution calculation method using the measured journal raising rate on the base of transfer matrix theory is presented. Shaft is divided into several sections at bearings. Journal raising rate difference at two ends of shaft section is decided by moments, shear forces, mass distribution along the section and bearing loads. Moment and shear force at left side of the first bearing can be calculated directly by using force and moment equilibrium equations. The first bearing load can be calculated from these two values and the measured journal raising rate at two bearings. Moment and shear force at left side of the second bearing can be calculated thereafter in the same way. The method is extended to later sections one by one until total bearing loads are calculated. The method is compared and verified with that of jack up method on test rig. It is used for bearing load identification and alignment analysis of a large turbine generator unit successfully. The method is a unitary identification method for shaft alignment analysis without taking off coupling bolts.

关 键 词：载荷 轴承 传递矩阵 对中 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]