A Feature-Based Reliability Modeling Method for Aerospace Multi-stage Mission System

Abstract

The invention relates to a feature-based space multi-phase mission system reliability modeling method. The method comprises the steps of (1) analyzing a mission profile of a space multi-phase mission system, determining a system reliability feature, and defining a phase mission state and a system mission state; (2) proposing a space multi-phase mission system reliability modeling method, building a system mission reliability model by adopting a multi-state event tree (MSET) method, and building a phase mission reliability model by adopting a Markov chain (MC) method; (3) calculating a state occupation probability (SOP) matrix in a terminal stage of phase mission, and determining a phase mission state probability; (4) building a phase state transfer model, and determining a phase transfer probability; and (5) calculating a system mission state probability. According to the method, the mission reliability feature of the space multi-phase mission system can be accurately described, so that the built mission reliability model is more accurate.

Description

technical field [0001] The invention relates to a feature-based reliability modeling method for aerospace multi-stage task systems, belonging to the technical field of system reliability. Background technique [0002] With the advancement of science and technology and the improvement of application requirements, complex engineering systems (such as manned spacecraft, space stations, reusable aircraft, etc.) use a large number of high-tech or high-energy materials (such as composite materials, nuclear materials), and work in high-risk environments (such as Space environment, re-entry atmosphere), various complex functions need to be realized, reliability work faces new requirements, and reliability modeling faces new challenges. [0003] For systems with a single mission stage or stand-alone products, reliability modeling generally adopts the traditional reliability block diagram (RBD) method to describe the reliability characteristics and logical relationships among the comp...

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Problems solved by technology

[0011] The problem solved by the present invention is: to overcome the deficiencies of existing methods, to provide a feature-based aerospace multi-stage mission system reliability modeling method, which can more accurately describe the multi-state characteristics of aerospace multi-stage mission system stage tasks and system tasks , and at the same time solve the problem of cross-stage reuse of units, making the established system task reliability model more accurate

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