Development of vibrational diagnosis system and creation of fault mode in rotating machinery

从理论上对事故进行预测，或在事故初期发现事故，是保护电厂或化工企业免受重大事故危害的最有效途径。为实现上述事项，为下列目的进行了调查。(1)建立了从旋转机械功能和结构角度预测故障模式的方法。(2)利用贝理论建立了精确的估计技术，明确了旋转机械测点的差异对测量振动数据的影响。(3)利用专家系统或神经网络理论开发了自动诊断算法，建立了故障原因数据库，并利用矩阵计数法、模糊理论、贝理论和神经网络系统建立了专家系统。即利用ExPart系统技术建立专家对诊断过程的分析和诊断过程建模的开发。在实际应用中，编制了主诊断计算机程序，其中增加了矩阵计数法、模糊理论、贝理论和神经网络理论等不同诊断算法的子系统，以便于相互比较。此外，还实现了Bay诊断技术和神经网络技术对故障的精确诊断。

It is a most effective way to protect the power plants or chemical plants from the big accidents that we predict the accident theoretically or find the accident at the initial stage of the faults. In order to achieve the above matters, the investigations were performed for the following objects. (1) Establishment of predicting method of fault modes from the viewpoints of function and stracture of rotating machinery. (2) Establishment of precise estimating technique by using the Bay's theory, in which the discrepancy of measurement vibrational data by the difference of measuring points of the rotating machinery are made clear. (3) Development of automatic diagnostic algorithm by using the expart system or neural network theory.As the results, the data base for the cause of the fault are established and the expart diagnostic systems by using the matrix counting method, fuzzy theory, Bay's theory and the neural network system are built up. That is, the analysis of diagnostic process by the specialist and the development of the modeling of the diagnostic process are built up by using the expart system technique. In practical case, main diagnostic computer program are finished, in which subsystem for different types of diagnostic algorithm, these are, the matrix counting method, fuzzy theory, Bay's theory and neural network theory can be added in order to compare with each other.In the diagnostic method, creation of fault modes and its relation to the vibration phenomena are clarified from the engineering point of view. Moreover realizations of Bay's diagnostic technique and the neural network technique to the precise diagnosis are accomplished.