Functional Reliability Evaluation And Health Assessment Of Explosive Logic Network Based On Failure Analysis

As a new application technology of burst control, the explosive logic network(ELN) and its functional realization play critical roles in the weapon system and determine the reliability and safety for initiating explosive devices. Once it fails, the better condition is that only the products failure, the worse is that we will suffer heavy economic losses and casualties. Therefore, we should investigate the e failure models and mechanism of ELN from the perspective of system reliability engineering, as well combine the method of performance design and analysis, which are of great significance to carry out its functional reliability evaluation and health assessment accordingly.Firstly, taking a certain type of ELN into account, and we studied its failure modes and failure factors based on its structural and functional properties, then established the fault tree model for qualitative analysis. Secondly, under some uncertainties inherent in a certain size parameters, we calculated the reliability window of the gap null gate, in term of probabilistic model and quantitative method so as to calculate the reliability of the gap null gate. Meanwhile, referring to estimated accuracy, we introduced the H-Bayes method in the field of initiating explosive devices. Finally, we brought the environmental monitoring data to health assessment system for ELN based on the Prognostic and Health Management(PHM). Moreover, when it comes to merging a variety of condition assessment information of ELN’s health level, we adopted the D-S evidential approach in information fusion, aiming to provide theoretical support and operational methods of health assessment and condition monitoring for initiating explosive devices.The main contributions of this paper are shown as follows:(1) Construct the fault tree model of a specific ELN from top to bottom in an orderly way.The failure mode of explosive logic network is mainly studied based on function failure state description and detonation wave propagation theory, and the invalidation factor of internal and external uncertainty factors is also analyzed. And then we conduct the fault tree to explore the key factors which causes the failure of the explosive logic system, in order to further study of functional characteristics and storage health state level.(2) Put forward a reliability evaluation method based on the combination of performance parameters and failure analysis.According to structure properties and functional characteristics of ELN and its element, we obtained performance parameters of explosive logic gap null gate by means of failure analysis. Then we calculate the reliability window with the performance parameter. We calculate function reliability based on the reliability function model of explosive logic gap null gate.(3) Establish the framework of system health assessment system for ELN based on integrating weighted multi-source information.In accord with the physical and chemical changes about system state of ELN based on fault tree, we describe the relevant state parameters. Then, we construct the framework of health status evaluation based on test information, history information and environmental data. Thus we use the extended Analytic Hierarchy Process(AHP) to decide weights relevant to the above three types of information. Finally, D-S evidence theory is used to integrating information for acquiring the health state level of the whole ELN system.