Blade fault diagnosis method without rotating speed reference signal
A technology of reference signal and fault diagnosis, applied in measurement devices, instruments, character and pattern recognition, etc., can solve the problem of unrealistic installation of speed sensors, and achieve the effect of reducing sensor cost, overcoming dependence, and improving feasibility
Pending Publication Date: 2021-04-30
XI AN JIAOTONG UNIV
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Problems solved by technology
However, in an actual engine, it is not realistic to install a speed sensor near the rotating shaft due to considerations of lead wires, engine performance, and sensor operating temperature.
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[0029] The following will refer to the attached Figure 1 to Figure 9 Specific examples of the present invention are described in more detail. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.
[0030] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout ...
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The invention discloses a blade fault diagnosis method without a rotating speed reference signal, and the method comprises the steps: building a blade vibration signal model, enabling the variation of an interval between an i-th blade and an i + 1-th blade to be the variation of an i-th blade tip interval, and enabling a blade tip interval variation signal and a blade vibration signal to be in a relation that yi = xi + 1-xi, wherein a rotating speed reference signal is not needed for calculation of a blade tip interval change signal, a linear relation exists between the blade tip interval change signal and a blade vibration signal, analyzing frequency components of the blade tip interval change signal and the blade vibration signal based on a multi-signal classification algorithm, carrying out intra-class comparison of the blade tip interval change signal frequency, wherein two frequency components exist in two adjacent blade tip distance change signals of the fault blade; and positioning the fault blade based on the two frequency components.
Description
technical field [0001] The invention belongs to the field of non-contact testing of blades, in particular to a method for diagnosing blade faults without reference signals of rotational speed. Background technique [0002] Blade tip timing technology is a hot field in the field of blade fault diagnosis in recent years. It has the advantages of non-contact, long life cycle, and online monitoring. However, due to the performance and cost requirements of aero-engines, sensor installation for tip timing is costly. The traditional tip timing test requires two sensors with different purposes, the speed sensor and the tip timing sensor. The tip timing sensor is usually installed on the casing to monitor the blade arrival signal, and the speed sensor needs to be installed near the shaft to monitor the key phase signal of the shaft. However, in an actual engine, it is not realistic to install a speed sensor near the rotating shaft due to considerations of lead wires, engine perform...
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Login to View More IPC IPC(8): G06K9/00G01B21/16
CPCG01B21/16G06F2218/12
Inventor 杨志勃王增坤李浩琪吴淑明田绍华陈雪峰曹佳辉
Owner XI AN JIAOTONG UNIV