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| 1 | Reliability estimation of rotary lip seal in aircraft utility system based on time-varying dependence degradation model and its experimental validation显示文摘With several attractive properties, rotary lip seals are widely used in aircraft utility system, and their reliability estimation has drawn more and more attention. This work proposes a reliability estimation approach based on time-varying dependence analysis. The dependence between the two performance indicators of rotary lip seals, namely leakage rate and friction torque, is modeled by time-varying copula function with polynomial to denote the time-varying parameters, and an efficient copula selection approach is utilized to select the optimal copula function. Parameter estimation is carried out based on a Bayesian method and the reliability during the whole lifetime is calculated based on a Monte Carlo method. Degradation test for rotary lip seal is conducted and the proposed model is validated by test data. The optimal copula function and optimal order of polynomial are determined based on test data. Results show that this model is effective in estimating the reliability of rotary lip seals and can achieve a better goodness of fit. | Chao ZHANG Rentong CHEN Guanghan BAI Shaoping WANG Mileta MTOMOVIC | 2020 | Chinese Journal of Aeronautics2020，33，8： | 3 |
| 2 | Improved resilience measure for component recovery priority in power grids显示文摘Given the complexity of power grids,the failure of any component may cause large-scale economic losses.Consequently,the quick recovery of power grids after disasters has become a new research direction.Considering the severity of power grid disasters,an improved power grid resilience measure and its corresponding importance measures are proposed.The recovery priority of failed components after a disaster is determined according to the influence of the failed components on the power grid resilience.Finally,based on the data from the 2019 Power Yearbook of each city in Shandong Province,China,the power grid resilience after a disaster is analyzed for two situations,namely,partial components failure and failure of all components.Result shows that the recovery priorities of components with different importance measures vary.The resilience evaluations under different repair conditions prove the feasibility of the proposed method. | Guanghan BAI Han WANG Xiaoqian ZHENG Hongyan DUI Min XIE | 2021 | Frontiers of Engineering Management2021，8，4： | 0 |
| 3 | Search for d-MPs without duplicates in two-terminal multistate networks based on MPs显示文摘The reliability evaluation of a multistate network is primarily based on d-minimal paths/cuts(d-MPs/d-MCs).However,being a nondeterminism polynomial hard(NP-hard)problem,searching for all d-MPs is a rather challenging task.In existing implicit enumeration algorithms based on minimal paths(MPs),duplicate d-MP candidates may be generated.An extra step is needed to locate and remove these duplicate d-MP candidates,which costs significant computational effort.This paper proposes an efficient method to prevent the generation of duplicate d-MP candidates for implicit enumeration algorithms for d-MPs.First,the mechanism of generating duplicate d-MP candidates in the implicit enumeration algorithms is discussed.Second,a direct and efficient avoiding-duplicates method is proposed.Third,an improved algorithm is developed,followed by complexity analysis and illustrative examples.Based on the computational experiments comparing with two existing algorithms,it is found that the proposed method can significantly improve the efficiency of generating d-MPs for a particular demand level d. | XU Bei FANG Yining BAI Guanghan ZHANG Yun’an TAO Junyong | 2022 | Journal of Systems Engineering and Electronics2022，33，6： | 0 |
| 4 | Dynamic Investigations on the Wear Behavior of a 3D Revolute Joint Considering Time-Varying Contact Stiffness: Simulation and Experiment显示文摘The existence of the relative radial and axial movements of a revolute joint’s journal and bearing is widely known.The three-dimensional(3D)revolute joint model considers relative radial and axial clearances;therefore,the freedoms of motion and contact scenarios are more realistic than those of the two-dimensional model.This paper proposes a wear model that integrates the modeling of a 3D revolute clearance joint and the contact force and wear depth calculations.Time-varying contact stiffness is first considered in the contact force model.Also,a cycle-update wear depth calculation strategy is presented.A digital image correlation(DIC)non-contact measurement and a cylindricity test are conducted.The measurement results are compared with the numerical simulation,and the proposed model’s correctness and the wear depth calculation strategy are verified.The results show that the wear amount distribution on the bearing’s inner surface is uneven in the axial and radial directions due to the journal’s stochastic oscillations.The maximum wear depth locates where at the bearing’s edges the motion direction of the follower shifts.These find-ings help to seek the revolute joints’wear-prone parts and enhance their durability and reliability through improved design. | Li Zhang Yining Fang Guanghan Bai Junyong Tao | 2023 | Chinese Journal of Mechanical Engineering2023，36，6： | 0 |
| 5 | Failure analysis of unmanned autonomous swarm considering cascading effects显示文摘In this paper, we focus on the failure analysis of unmanned autonomous swarm(UAS) considering cascading effects. A framework of failure analysis for UAS is proposed.Guided by the framework, the failure analysis of UAS with crash fault agents is performed. Resilience is used to analyze the processes of cascading failure and self-repair of UAS. Through simulation studies, we reveal the pivotal relationship between resilience, the swarm size, and the percentage of failed agents.The simulation results show that the swarm size does not affect the cascading failure process but has much influence on the process of self-repair and the final performance of the swarm.The results also reveal a tipping point exists in the swarm. Meanwhile, we get a counter-intuitive result that larger-scale UAS loses more resilience in the case of a small percentage of failed individuals, suggesting that the increasing swarm size does not necessarily lead to high resilience. It is also found that the temporal degree failure strategy performs much more harmfully to the resilience of swarm systems than the random failure. Our work can provide new insights into the mechanisms of swarm collapse, help build more robust UAS, and develop more efficient failure or protection strategies. | XU Bei BAI Guanghan ZHANG Yun’an FANG Yining TAO Junyong | 2022 | Journal of Systems Engineering and Electronics2022，33，3： | 0 |
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