Experimental research on turbine rotor vibration of nonlinear mechanics based on fractal box counting dimension
Turbine fault forecasting and diagnosis is an important application of modem fault diagnosis technology, and the turbine rotor fault problem should belong to nonlinear mechanics category because of its key station and complex working environment. The vibration signal and its characteristic signal of the running mechanical equipment and structured system is the main information to reflect the entire system and its variation tendency.Fractal is a good method to solve complex problem especially nonlinear problem. The key part of fractal calculation is the fractal dimension which directly reflects the complex degree of the nonlinear system. The dimension can quantitatively show the statistic self-similar character of the fractal boundary. Different kind of fractal dimension will properly be used in different kind of nonlinear dynamics system. In this paper, the fractal box counting dimension is calculated to solve the turbine rotor fault mechanics, the fractal box counting dimension is compared, and fault diagnosis according to the value size is carried on.The results show that the fractal box counting dimension of rubbing is the largest, in this the nylon rod rubbing box counting dimension is 1.32 and the metal rubbing box counting dimension is the largest, 1.44. The axis track of mass unbalance is smoother, and its box counting dimension is the smallest, 1.04. The fractal box counting dimension of uncountershaft and loosing is larger than mat of mass unbalance, 1,26 and 1.28. In conclusion, the fractal box counting dimension can obviously reflect the degree of disorder of a nonlinear mechanics system, and it is more useful for the steam-turbine rotor nonlinear mechanics to determine the fault type.
Fu-mei Fan Ping Liang
Electricity Power College, South China University of Technology, Guangzhou 510640, China
国际会议
The 5th International Conference on Nonlinear Mechanics(第五届国际非线性力学会议)
上海
英文
1234-1239
2007-06-11（万方平台首次上网日期，不代表论文的发表时间）