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您的检索式：作者名="Zerui PENG"
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| 1 | New insight into the stability and dynamics of fluid-conveying supported pipes with small geometric imperfections显示文摘In several previous studies,it was reported that a supported pipe with small geometric imperfections would lose stability when the internal flow velocity became sufficiently high.Recently,however,it has become clear that this conclusion may be at best incomplete.A reevaluation of the problem is undertaken here by essentially considering the flow-induced static deformation of a pipe.With the aid of the absolute nodal coordinate formulation(ANCF)and the extended Lagrange equations for dynamical systems containing non-material volumes,the nonlinear governing equations of a pipe with three different geometric imperfections are introduced and formulated.Based on extensive numerical calculations,the static equilibrium configuration,the stability,and the nonlinear dynamics of the considered pipe system are determined and analyzed.The results show that for a supported pipe with the geometric imperfection of a half sinusoidal wave,the dynamical system could not lose stability even if the flow velocity reaches an extremely high value of 40.However,for a supported pipe with the geometric imperfection of one or one and a half sinusoidal waves,the first-mode buckling instability would take place at high flow velocity.Moreover,based on a further parametric analysis,the effects of the amplitude of the geometric imperfection and the aspect ratio of the pipe on the static deformation,the critical flow velocity for buckling instability,and the nonlinear responses of the supported pipes with geometric imperfections are analyzed. | Kun ZHOU Qiao NI Wei CHEN Huliang DAI Zerui PENG Lin WANG | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，5： | 3 |
| 2 | Utilization of nonlinear vibrations of soft pipe conveying fluid for driving underwater bio-inspired robot显示文摘Creatures with longer bodies in nature like snakes and eels moving in water commonly generate a large swaying of their bodies or tails,with the purpose of producing significant frictions and collisions between body and fluid to provide the power of consecutive forward force.This swaying can be idealized by considering oscillations of a soft beam immersed in water when waves of vibration travel down at a constant speed.The present study employs a kind of large deformations induced by nonlinear vibrations of a soft pipe conveying fluid to design an underwater bio-inspired snake robot that consists of a rigid head and a soft tail.When the head is fixed,experiments show that a second mode vibration of the tail in water occurs as the internal flow velocity is beyond a critical value.Then the corresponding theoretical model based on the absolute nodal coordinate formulation(ANCF)is established to describe nonlinear vibrations of the tail.As the head is free,the theoretical modeling is combined with the computational fluid dynamics(CFD)analysis to construct a fluid-structure interaction(FSI)simulation model.The swimming speed and swaying shape of the snake robot are obtained through the FSI simulation model.They are in good agreement with experimental results.Most importantly,it is demonstrated that the propulsion speed can be improved by 21%for the robot with vibrations of the tail compared with that without oscillations in the pure jet mode.This research provides a new thought to design driving devices by using nonlinear flow-induced vibrations. | Huliang DAI Yixiang HE Kun ZHOU Zerui PENG Lin WANG P.HAGEDORN | 2022 | Applied Mathematics and Mechanics(English Edition)2022，43，7： | 0 |
| 3 | An incentive-compatible rational secret sharing scheme using blockchain and smart contract显示文摘In the rational cryptographic protocol,the two rational players often fall into the prisoner's dilemma,which is also the case for the rational secret sharing we consider in this paper.First,it is proved that rational secret sharing has a sequential equilibrium in the natural state,so that rational participants will fall into the prisoner's dilemma,resulting in no participants being able to reconstruct the secret correctly.Next,to solve this problem,we propose an incentive-compatible rational secret scheme.Specifically,the game tree with imperfect information is constructed to facilitate our analysis and proof,and the strictly dominated strategies are directly eliminated to simplify the game tree.Further more,we describe the motivation of the verifier.Then,we prove that rational players have no motivation to deviate from honest behavior using sequential equilibrium so that rational players can reconstruct the secret correctly.Finally,we complete the simulation using the smart contract and analyze our entire scheme.In addition,the game of our scheme does not need to be repeated multiple times to reach sequential equilibrium,i.e.,the game always follows the rational path. | Zerui CHEN Youliang TIAN Changgen PENG | 2021 | Science China(Information Sciences)2021，64，10： | 0 |
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