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| 1 | Dynamic Crushing Strength Analysis of Auxetic Honeycombs显示文摘The in-plane dynamic crushing behavior of re-entrant honeycomb is analyzed and compared with the conventional hexagon topology.Detailed deformation modes along two orthogonal directions are examined,where a parametric study of the effect of impact velocity and cell wall aspect ratio is performed.An analytical formula of the dynamic crushing strength is then deduced based on the periodic collapse mechanism of cell structures.Comparisons with the finite element results validate the effectiveness of the proposed analytical method.Numerical results also reveal higher plateau stress of re-entrant honeycomb over conventional hexagon topology,implying better energy absorption properties.The underlying physical understanding of the results is emphasized,where the auxetic effect(negative Poisson's ratio) induced in the re-entrant topology is believed to be responsible for this superior impact resistance. | Xiuhui Hou Zichen Deng Kai Zhang | 2016 | Acta Mechanica Solida Sinica2016，29，5： | 16 |
| 2 | 1990—2017年中国伤害负担:2017年全球疾病负担研究结果(摘译)显示文摘伤害是全球性的公共卫生挑战,涉及各年龄组和不同性别的人群。过去三十年来,中国经济快速发展,人口老龄化趋势加重,社会呈现出城镇化、机动化和老龄化等特征。随着人们生活环境和生活方式的改变,伤害已跃居人群致死原因第五位,仅排在恶性肿瘤、心脑血管疾病、呼吸系统疾病和心肌梗死之后。据估计,中国每年在伤害方面消耗的直接医疗费用约为650亿元人民币. | 林泽婷(译) 吕来文(译) 黄晓晴(译) 李丽萍(审校) Duan Leilei Ye Pengpeng Juanita A Haagsma Jin Ye Wang Yuan Er Yuliang Deng Xiao Gao Xin Ji Cuirong Wang Linhong Marlena S Bannick W Cli Mountjoy-Venning Caitlin N Hawley Zichen Liu Mari Smith Spencer L James Theo Vos Christopher J L Murray | 2020 | 伤害医学(电子版)2020，9，2： | 15 |
| 3 | Electrical activities of neural systems exposed to sinusoidal induced electric field with random phase显示文摘The brain neural system is often disturbed by electromagnetic and noise environments, and research on dynamic response of its interaction has received extensive attention. This paper investigates electrical activity of Morris-Lecar neural systems exposed to sinusoidal induced electric field(IEF) with random phase generated by electromagnetic effect. By introducing a membrane depolarization model under the effect of random IEF, transition state of firing patterns, including mixed-mode oscillations(MMOs) with layered inter-spike intervals(ISI) and intermittency with a power law distribution in probability density function of ISI, is obtained in a single neuron. Considering the synergistic effects of frequency and noise, coherence resonance is performed by phase noise of IEF under certain parameter conditions. For the neural network without any internal coupling, we demonstrate that synchronous oscillations can be induced by IEF coupling, and suppression of synchronous spiking is achieved effectively by phase noise of IEF. Results of the study enrich the dynamical response to electromagnetic induction and provide insights into mechanisms of noise affecting information coding and transmission in neural systems. | DU Lin CAO ZiLu LEI YouMing DENG ZiChen | 2019 | Science China(Technological Sciences)2019，62，7： | 5 |
| 4 | Elastic Wave Propagation in Lattice Metamaterials with Koch Fractal显示文摘In this study,the wave propagation properties of lattice metamaterials with Koch fractal structures are investigated in terms of band structures and directional wave propagation.The analytical models of lattice metamaterials are established using the finite element method,and the dispersion relation is solved using the Bloch’s theorem.The band structures of the lattice metamaterials with different numbers of iterations are studied,and the group velocities at a selected frequency are calculated to analyze the directional wave propagation characteristics.Furthermore,dynamic responses of the finite structures are calculated using commercial finite element software to verify the band gaps and directional wave propagation behaviors in the lattice metamaterials.The results show that multiple and low band gaps are present in the lattice materials with various geometric parameters of the Koch fractal,and the position of the lowest band gap decreases as the number of iterations increases.The results indicate the potential applications of lattice metamaterials with Koch fractals for vibration isolation and multi-functional design. | Pengcheng Zhao Kai Zhang Zichen Deng | 2020 | Acta Mechanica Solida Sinica2020，33，5： | 4 |
| 5 | Minimum Control Energy of Spatial Beam with Assumed Attitude Adjustment Target显示文摘The dynamic analysis on the ultra-large spatial structure can be simplified drastically by ignoring the flexibility and damping of the structure.However,these simplifications will result in the erroneous estimate on the dynamic behaviors of the ultra-large spatial structure.Taking the spatial beam as an example,the minimum control energy defined by the difference between the initial total energy and the final total energy in the assumed stable attitude state of the beam is investigated by the structure-preserving method proposed in our previous studies in two cases:the spatial beam considering the flexibility as well as the damping effect,and the spatial beam ignoring both the flexibility and the damping effect.In the numerical experiments,the assumed simulation interval of three months is evaluated on whether or not it is long enough for the spatial flexible damping beam to arrive at the assumed stable attitude state.And then,taking the initial attitude angle and the initial attitude angle velocity as the independent variables,respectively,the minimum control energies of the mentioned two cases are investigated in detail.From the numerical results,the following conclusions can be obtained.With the fixed initial attitude angle velocity,the minimum control energy of the spatial flexible damping beam is higher than that of the spatial rigid beam when the initial attitude angle is close to or far away from the stable attitude state.With the fixed initial attitude angle,ignoring the flexibility and the damping effect will underestimate the minimum control energy of the spatial beam. | Weipeng Hu Lingjun Yu Zichen Deng | 2020 | Acta Mechanica Solida Sinica2020，33，1： | 4 |
| 6 | DESIGN OPTIMIZATION FOR TRUSS STRUCTURES UNDER ELASTO-PLASTIC LOADING CONDITION显示文摘在这篇论文,为设计优化的一个方法 elasto 塑料捆绑结构基于参量的变化原则(PVP ) 被建议。优化试图在许可的节点排水量的限制下面发现最小的重量 / 卷答案。Thedesign 优化是有平衡限制(MPEC ) 的数学编程的明确的表达。在优化克服互补限制的数字困难,重复进程,包括二次的编程(QP ) 和更新的进程,被采用著名计算机生产厂商他优化方法。而且, elasto 塑料的弄弯捆绑成员在设计优化被看作限制。combinational 优化策略为排水量限制和弄弯的限制被建议,它包括上面提及的方法和一个最佳的标准。三个数字例子被举证明方法的有效性求婚了。 | Liu Tao Deng Zichen | 2006 | Acta Mechanica Solida Sinica2006，19，3： | 4 |
| 7 | SYMPLECTIC ANALYSIS FOR WAVE PROPAGATION OF HIERARCHICAL HONEYCOMB STRUCTURES显示文摘Wave propagation in two-dimensional hierarchical honeycomb structures with twoorder hierarchy is investigated by using the symplectic algorithm. By applying the variational principle to the dual variables, the wave propagation problem is transformed into a two-dimensional symplectic eigenvalue problem. The band gaps and spatial filtering phenomena are examined to find the stop bands and directional stop bands. Special attention is directed to the effects of the relative density and the length ratio on the band gaps and phase constant surfaces. This work provides new opportunities for designing hierarchical honeycomb structures in sound insulation applications. | Kai Zhang Zichen Deng Xiaojian Xu Xiuhui Hou Junmiao Meng | 2015 | Acta Mechanica Solida Sinica2015，28，3： | 3 |
| 8 | Multi-resonator coupled metamaterials for broadband vibration suppression显示文摘In this study,multi-resonator coupled metamaterials(MRCMs)with local resonators are proposed to obtain the multiple and wide band gaps.Kinetic models of the MRCMs are established,and the boundary conditions of the unit cell are obtained with Bloch's theorem.The effects of structural parameters,including the mass of the resonator and the spring stiffness,on the distributions of the band gaps are studied.Furthermore,the frequency domain responses and the time domain responses are calculated for analyzing the structural vibration characteristics and the effects of damping on structural vibration.The results show that the frequency domain response can accurately express the distributions of the band gaps of the MRCMs,and we can increase the number and the width of the band gaps by using the MRCMs for the superior vibration suppression capability. | Pengcheng ZHAO Kai ZHANG Cheng ZHAO Zichen DENG | 2021 | Applied Mathematics and Mechanics(English Edition)2021，42，1： | 3 |
| 9 | Particle swarm optimization-based algorithm of a symplectic method for robotic dynamics and control显示文摘Multibody system dynamics provides a strong tool for the estimation of dynamic performances and the optimization of multisystem robot design. It can be described with differential algebraic equations(DAEs). In this paper, a particle swarm optimization(PSO) method is introduced to solve and control a symplectic multibody system for the first time. It is first combined with the symplectic method to solve problems in uncontrolled and controlled robotic arm systems. It is shown that the results conserve the energy and keep the constraints of the chaotic motion, which demonstrates the efficiency, accuracy, and time-saving ability of the method. To make the system move along the pre-planned path, which is a functional extremum problem, a double-PSO-based instantaneous optimal control is introduced. Examples are performed to test the effectiveness of the double-PSO-based instantaneous optimal control. The results show that the method has high accuracy, a fast convergence speed, and a wide range of applications.All the above verify the immense potential applications of the PSO method in multibody system dynamics. | Zhaoyue XU Lin DU Haopeng WANG Zichen DENG | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，1： | 3 |
| 10 | Dynamic modeling and simulation of deploying process for space solar power satellite receiver显示文摘To reveal some dynamic properties of the deploying process for the solar power satellite via an arbitrarily large phased array(SPS-ALPHA) solar receiver, the symplectic Runge-Kutta method is used to simulate the simplified model with the consideration of the Rayleigh damping effect. The system containing the Rayleigh damping can be separated and transformed into the equivalent nondamping system formally to insure the application condition of the symplectic Runge-Kutta method First, the Lagrange equation with the Rayleigh damping governing the motion of the system is derived via the variational principle. Then, with some reasonable assumptions on the relations among the damping,mass, and stiffness matrices, the Rayleigh damping system is equivalently converted into the nondamping system formally, so that the symplectic Runge-Kutta method can be used to simulate the deploying process for the solar receiver. Finally, some numerical results of the symplectic Runge-Kutta method for the dynamic properties of the solar receiver are reported. The numerical results show that the proposed simplified model is valid for the deploying process for the SPS-ALPHA solar receiver, and the symplectic Runge-Kutta method can preserve the displacement constraints of the system well with excellent long-time numerical stability. | Tingting YIN Zichen DENG Weipeng HU Xindong WANG | 2018 | Applied Mathematics and Mechanics(English Edition)2018，39，2： | 2 |
| 11 | Theoretical and Applied Mechanics Letters显示文摘The placement of pressure taps on the surface of the wind tunnel test model is an important means toobtain the surface pressure distribution.However,limited by space location and experimental cost,it isdifficult to arrange enough pressure measuring taps on the surface of complex models to obtain completepressure distribution information,thus it is impossible to obtain accurate lift and moment characteristicsthrough integration.The paper proposes a refined reconstruction method of airfoil surface pressure basedon compressed sensing,which can reconstruct the pressure distribution with high precision with lesspressure measurement data.Tests on typical airfoil subsonic flow around flow show that the accuracyof lift and moment after the pressure integration reconstructed by 4-8 measuring points can meet therequirements of the national military standard.The algorithm is robust to noise,and provides a new ideafor obtaining accurate force data from sparse surface pressure tests in engineering. | Xuan Zhao Lin Du Xuhao Peng Zichen Deng Weiwei Zhang | 2021 | Theoretical & Applied Mechanics Letters2021，11，2： | 2 |
| 12 | The complex multi-symplectic scheme for the generalized sinh-Gordon equation显示文摘In this paper,the complex multi-symplectic method and the implementation of the generalized sinhGordon equation are investigated in detail.The multi-symplectic formulations of the generalized sinh-Gordon equation in Hamiltonian space are presented firstly.The complex method is introduced and a complex semi-implicit scheme with several discrete conservation laws(including a multi-symplectic conservation law(CLS),a local energy conservation law(ECL) as well as a local momentum conservation law(MCL)) is constructed to solve the partial differential equations(PDEs) that are derived from the generalized sinh-Gordon equation numerically.The results of the numerical experiments show that the multi-symplectic scheme has excellent long-time numerical behavior and high accuracy. | HU WeiPeng DENG ZiChen HAN SongMei FAN Wei | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，10： | 2 |
| 13 | Coupling dynamic characteristics of simplified model for tethered satellite system显示文摘connecting wires are the main manifestations of the coupling dynamic effects on the orbit evolution,the attitude adjusting and the flexible vibration of the tethered satellite system.To investigate attitude evolution of the tethered system and the mechanical energy transfer/loss characteristics between the bus system and the solar sail via the connecting wires,a structure-preserving method is developed in this paper.Simplifying the tethered satellite system as a composite structure consisting of a particle and a flexible thin panel connected by four special springs,the dynamic model is deduced via the Hamiltonian variational principle firstly.Then,a structure-preserving approach that connects the symplectic Runge-Kutta method and the multi-symplectic method is developed.The excellent structure-preserving property of the numerical scheme constructed is presented to illustrate the credibility of the numerical results obtained by the constructed structure-preserving approach.From the numerical results on the mechanical energy transfer/loss in the composite structure,it can be found that the mechanical energy transfer tendency in the tethered system is dependent of the initial attitude angle of the system while the total mechanical energy loss of the system is almost independent of the initial attitude angle.In addition,the special stiffness range of the spring is found in the attitude angle evolution of the system,which provides a structural parameter design window for the connecting wires,that is,the duration needed to arrive the stable attitude is short when the stiffness of the wire is designed in this special range. | Weipeng Hu Yulu Huai Mengbo Xu Zichen Deng | 2021 | Acta Mechanica Sinica2021，37，8： | 2 |
| 14 | Projected Runge-Kutta methods for constrained Hamiltonian systems显示文摘Projected Runge-Kutta(R-K) methods for constrained Hamiltonian systems are proposed.Dynamic equations of the systems,which are index-3 differential-algebraic equations(DAEs) in the Heisenberg form,are established under the framework of Lagrangian multipliers.R-K methods combined with the technique of projections are then used to solve the DAEs.The basic idea of projections is to eliminate the constraint violations at the position,velocity,and acceleration levels,and to preserve the total energy of constrained Hamiltonian systems by correcting variables of the position,velocity,acceleration,and energy.Numerical results confirm the validity and show the high precision of the proposed method in preserving three levels of constraints and total energy compared with results reported in the literature. | Yi WEI Zichen DENG Qingjun LI Bo WANG | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，8： | 1 |
| 15 | Interaction effects of DNA, RNA-polymerase, and cellular fluid on the local dynamic behaviors of DNA显示文摘In view of the complex structure and environment,the dynamic analysis on deoxyribonucleic acid(DNA)is a challenge in the biophysics field.Considering the local interaction with ribonucleic acid(RNA)-polymerase as well as the dissipative effect of cellular fluid,a coupling sine-Gordon-type dynamic model is used to describe the rotational motions of the bases in DNA.First,the approximate symmetric form is constructed.Then,the wave form and the wave velocity of the kink solution to the proposed dynamic model are investigated by a Runge-Kutta structure-preserving scheme based on the generalized multi-symplectic idea.The numerical results indicate that,the strengthening of the local interaction between DNA and RNA-polymerase described by the coupling potential makes the form of the kink solution steep,while the appearance of the friction between DNA and cellular fluid makes the form of the kink solution flat.In addition,the appearance of the friction decreases the velocities of both the symplectic configuration and the anti-symplectic configuration with different degrees.The above findings are beneficial to comprehend the DNA transcription mechanism. | Weipeng HU Zichen DENG | 2020 | Applied Mathematics and Mechanics(English Edition)2020，41，4： | 1 |
| 16 | An im- proved symplectic precise integration method for analysis of the rotating rigid-flexible coupled system 显示文摘 | HUANG Yongan DENG Zichen YAO Linxiao | 2007 | Journal of Sound and Vibration2007，299，12： | 1 |
| 17 | Disease resistance conferred by components of essential chrysanthemum oil and the epigenetic regulation of OsTPS1显示文摘The sesquiterpene alpha-bisabolol is the predominant active ingredient in essential oils that are highly valued in the cosmetics industry due to its wound healing,anti-inflammatory,and skin-soothing properties.Alpha-bisabolol was thought to be restricted to Compositae plants.Here we reveal that alpha-bisabolol is also synthesized in rice,a non-Compositae plant,where it acts as a novel sesquiterpene phytoalexin.Overexpressing the gene responsible for the biosynthesis of alpha-bisabolol,Os TPS1,conferred bacterial blight resistance in rice.Phylogenomic analyses revealed that alpha-bisabolol-synthesizing enzymes in rice and Compositae evolved independently.Further experiments demonstrated that the natural variation in the disease resistance level was associated with differential transcription of Os TPS1 due to polymorphisms in its promoter.We demonstrated that Os TPS1 was regulated at the epigenetic level by JMJ705 through the methyl jasmonate pathway.These data reveal the cross-family accumulation and regulatory mechanisms of alpha-bisabolol production. | Chuansong Zhan Long Lei Hao Guo Shen Zhou Congping Xu Zixin Liu Zichen Wu Yuan Deng Yuanyuan Miao Yu Han Meng Zhang Hua Li Sishu Huang Chenkun Yang Feng Zhang Yufei Li Ling Liu Xianqing Liu Hafiz Muhammad Khalid Abbas Alisdair R.Fernie Meng Yuan Jie Luo | 2023 | Science China(Life Sciences)2023，66，5： | 1 |
| 18 | Analytical modeling and finite element simulation of the plasticcollapse of sandwich beams with pin-reinforced foam cores 显示文摘 | LIU Tao DENG Zichen LU Tianjian | 2008 | International Journal of Solids and Struc- tures2008，45，1819： | 1 |
| 19 | Structure-preserving properties of Strmer-Verlet scheme for mathematical pendulum显示文摘The structure-preserving property, in both the time domain and the frequency domain, is an important index for evaluating validity of a numerical method. Even in the known structure-preserving methods such as the symplectic method, the inherent conservation law in the frequency domain is hardly conserved. By considering a mathematical pendulum model, a Strmer-Verlet scheme is first constructed in a Hamiltonian framework. The conservation law of the Strmer-Verlet scheme is derived, including the total energy expressed in the time domain and periodicity in the frequency domain. To track the structure-preserving properties of the Strmer-Verlet scheme associated with the conservation law, the motion of the mathematical pendulum is simulated with different time step lengths. The numerical results illustrate that the Strmer-Verlet scheme can preserve the total energy of the model but cannot preserve periodicity at all. A phase correction is performed for the Strmer-Verlet scheme. The results imply that the phase correction can improve the conservative property of periodicity of the Strmer-Verlet scheme. | Weipeng HU Mingzhe SONG Zichen DENG | 2017 | Applied Mathematics and Mechanics(English Edition)2017，38，9： | 1 |
| 20 | Wave Propagation Characteristics in Thick Conventional and Auxetic Cellular Plates显示文摘Based on Mindlin plate models and Kirchhoff plate models,this study was concerned with the wave propagation characteristics in thick conventional and auxetic cellular structures,with the objective to clarify the effects of negative Poisson's ratio,shear factor and orthotropic mechanical properties on the dynamic behaviors of thick plates.Numerical results revealed that the predictions using variable shear factor in Mindlin plate models resulted in high wave frequencies,which were more significant for plates with negative values of Poisson's ratio.The present study can be useful for the design of critical applications by varying the values of Poisson's ratio. | Xiaojian Xu Zichen Deng | 2016 | Acta Mechanica Solida Sinica2016，29，2： | 1 |
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