Reliability analysis method for electromechanical actuator based on fuzzy dynamic fault tree

An electromechanical actuator and dynamic fault tree technology, applied in the direction of instruments, electrical testing/monitoring, program control, etc., can solve the problems of poor applicability and large amount of calculation, so as to avoid complexity and alleviate the problem of large amount of calculation Effect

Inactive Publication Date: 2016-06-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a reliability analysis method for electromechanical actuators based on fuzzy dynamic fault trees, which solves the problems of poor applicability, Calculation-intensive technical issues

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  • Reliability analysis method for electromechanical actuator based on fuzzy dynamic fault tree
  • Reliability analysis method for electromechanical actuator based on fuzzy dynamic fault tree
  • Reliability analysis method for electromechanical actuator based on fuzzy dynamic fault tree

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Embodiment Construction

[0037] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0038] The present invention is an electromechanical actuator reliability analysis method based on fuzzy dynamic fault tree, and its analysis process is as attached figure 1 As shown, including the establishment of dynamic fault tree, acquisition and simplification of fault tree algebraic model expression, qualitative analysis and quantitative analysis, and finally determine the fault diagnosis strategy of electromechanical actuator.

[0039] Refer to attached figure 2 , The electromechanical actuator consists of a two-way speed-adjustable servo motor, a control unit and a mechanical deceleration device. The adjustable-speed bidirectional brushless motor with high conversion efficiency and good heat dissipation is adopted. The external motor control unit controls the speed of the motor through the phase-current relationship, and then the high-speed and low-torq...

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Abstract

The invention relates to a reliability analysis method for an electromechanical actuator based on a fuzzy dynamic fault tree. According to the method, top, intermediate and bottom events of the electromechanical actuator analyzed and determined to establish the dynamic fault tree, a dynamic logic gate is replaced with an algebraic operator, an algebraic model of the dynamic fault tree is converted into and solved, data of a triangular fuzzy set is used to represent the fuzzy reliability of the bottom event, the algebraic model is decomposed into a static subtree and a dynamic subtree for solution, the fuzzy probability of failure of an electromechanical actuator system is obtained via integration, and a weak link of the electromechanical actuator system is determined by analyzing the fuzzy importance degree. The method of the invention can be used to analyze the reliability of the electromechanical actuator effectively, solve the problem that traditional dynamic fault tree analysis is high in the computational complexity, and provides reference for fault positioning of the electromechanical actuator.

Description

technical field [0001] The invention belongs to the technical field of electromechanical actuator fault detection, and relates to a reliability analysis method for electromechanical actuators based on a fuzzy dynamic fault tree. Background technique [0002] In order to cooperate with the development of all-electric aircraft, the actuation system of the aircraft has been developed from power fluid transmission to power transmission. The electromechanical actuator is one of the typical actuators in the power-by-wire actuation system, which has the advantages of light weight, easy maintenance, and strong adaptability. The actuator is a key component of the actuation system. Since the electromechanical actuator is a new type of actuator in the aviation field, its fault diagnosis methods and fault data are still scarce, and it is mostly used for driving auxiliary rudder surfaces. Therefore, the research on the reliability analysis of the electromechanical actuator will be of gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0248G05B2219/23447
Inventor 谢蓉曹宇燕王剑李婷王新民
Owner NORTHWESTERN POLYTECHNICAL UNIV
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