Abstract
The power transfer systems (PTS) has special reliability properties, including multiple states and fault dependence. Consequently, traditional binary-state reliability modeling methods cannot accurately evaluate the reliability of PTS. In order to resolve the contradiction between terminal energy demand and power transfer capability of PTS, this paper proposes a novel multi-state reliability model based on power transfer efficiency (PTE) for reliability evaluation of PTS. The multi-state model caused by performance degradation based on PTE is considered in this paper. In addition, the failure correlation in virtue of the system structure and energy allocation mechanism is analyzed in the proposed model, and the corresponding reliability evaluation result is obtained under different terminal energy requirements. The approach is verified on the example of a dual hydraulic actuation system (DHAS), in which the stochastic model based on the generalized stochastic Petri nets (GSPNs) is established and combined with the power transfer capability via universal generating function (UGF). Though changing flow rate to face the degradation rate of hydraulic pump, the reliability assessment of DHAS based on the proposed reliability model is effective and accurate.
Highlights
The systems in engineering field, in terms of their basic functions, can be divided into signal transfer system (STS), power transfer system (PTS), and mass transfer system (MTS)
In order to verify the effectiveness of the proposed reliability analysis, we compare the power transfer efficiency (PTE)-based reliability model proposed in this paper with the traditional reliability model based on reliability block diagram (RBD) for Dual hydraulic actuation system (DHAS)
This paper proposes a PTE-based reliability model considering the PTE and degradation process of component and system
Summary
The systems in engineering field, in terms of their basic functions, can be divided into signal transfer system (STS), power transfer system (PTS), and mass transfer system (MTS). Due to the lack of considering the fault behavior process, this reliability model cannot accurately describe the fault coupling among the components in PTS, and it fails to assess the impact of multiple states on terminal’s demands. As a typical case of multi-state PTS, aircraft actuation system has distinct component degradation process and multiple power transfer states. The aircraft actuation system based on multiple power resources and heterogeneous driving system becomes complicated cyber-physical system, in which the power supply systems, control computers and the actuators are different and complex fault tolerant strategies are designed Under these circumstances, even if there are multiple faults, the performance of the actuation system can remain normal or slightly degraded, which is a specific multi-state system (MSS).
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