A gas path fault diagnostic model for gas turbine based on deep belief network with prior information

Abstract

Gas turbine is widely used in national defense and energy industry. It is significant to carry out gas path fault diagnosis of gas turbine, due to its great impacts on operation and maintenance. With the development of sensor technology and information technology, it is the time of multi-source data generation automatically, so as to provide a good foundation for the development of gas path fault diagnosis. However, the relationship between fault effects and fault modes has not been demonstrated clearly. Thus the theoretical basis for mechanism model is lacked, and data-driven approach for gas path diagnosis is increasingly attractive. In this paper, a novel data-driven model for gas path fault diagnosis based on deep belief network with prior information has been proposed. The effect of network structure on diagnostic accuracy has been studied, and the comparison of this approach between other data-driven approaches has been conducted. The comparing result confirms that this model has an obvious advantage over conventional data-driven models after structure optimization and can be employed to gas path fault diagnosis of gas turbine.