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| 1 | 弹性圆柱壳在轴向冲击载荷和温度耦合作用下的屈曲显示文摘通过引入哈密顿体系,将临界载荷和临界温度及它们所对应的屈曲模态归结为辛体系下的广义本征值和本征解问题。根据辛本征解的正交性和完备性,给出了全部的且独立存在的屈曲模态。数值结果表明,在轴向冲击载荷和温度耦合作用下,弹性圆柱壳的屈曲呈现出复杂的模式,温度直接影响冲击临界载荷的大小。随着温度的增加,冲击临界荷载降低,最后,文中给出各种条件下的屈曲模态。 | 褚洪杰 徐新生 C.W.Lim 马建青 | 2010 | 计算力学学报2010，27，5： | 4 |
| 2 | An analytical symplectic approach to the vibration analysis of orthotropic graphene sheets显示文摘A nonlocal continuum orthotropic plate model is proposed to study the vibration behavior of single-layer graphene sheets(SLGSs) using an analytical symplectic approach. A Hamiltonian system is established by introducing a total unknown vector consisting of the displacement amplitude, rotation angle, shear force, and bending moment.The high-order governing differential equation of the vibration of SLGSs is transformed into a set of ordinary differential equations in symplectic space. Exact solutions for free vibration are obtianed by the method of separation of variables without any trial shape functions and can be expanded in series of symplectic eigenfunctions. Analytical frequency equations are derived for all six possible boundary conditions. Vibration modes are expressed in terms of the symplectic eigenfunctions. In the numerical examples, comparison is presented to verify the accuracy of the proposed method. Comprehensive numerical examples for graphene sheets with Levy-type boundary conditions are given. A parametric study of the natural frequency is also included. | Xinsheng Xu Dalun Rong C.W.Lim Changyu Yang Zhenhuan Zhou | 2017 | Acta Mechanica Sinica2017，33，5： | 4 |
| 3 | 轴向脉冲载荷冲击下弹性圆柱壳动态屈曲中的竹节现象显示文摘本文针对弹性圆柱壳在轴向脉冲载荷冲击下动态局部屈曲问题,提出一种新的方法,即哈密顿体系方法.通过构造哈密顿体系,在辛空间中将临界载荷和动态屈曲模态归结为辛本征值和本征解问题.发现圆柱壳屈曲的临界载荷被分为两类,其分别对应圆柱壳压缩屈曲和弯曲屈曲.辛本征解反映了局部的压缩屈曲模态和横向的弯曲屈曲模态.在物理上表现出壳体的压缩型竹节屈曲现象和弯曲型竹节屈曲现象.同时数值结果揭示了临界载荷和屈曲模态的规律及影响因素. | 马建青 徐新生 C.W.Lim 孙家斌 | 2011 | 哈尔滨工业大学学报2011，43，S1： | 1 |
| 4 | 查看详情显示文摘 | C.F.Lu W.Q.Chen C.W.Lim | | 0，，： | 1 |
| 5 | 查看详情显示文摘 | C.F.Lu C.W.Lim W.Q.Chen | | 0，，： | 1 |
| 6 | A Novel Application of Multi-Resonant Dissipative Elastic Metahousing for Bearings显示文摘Bearing as an important machine element is widely used for industrial and automotive applications.At certain operational speed,bearings induce disturbing vibrations and noises that affect machine service life,productivity and passenger comfort in case of vehicle applications.Dissipative elastic metamaterials have caught considerable attention of scientific community due to their effective medium properties and peculiar dynamic characteristics including frequency bandgaps that can be effectively applied to attenuate and control undesirable vibration and noises.Although a substantial amount of theoretical work for effective medium characteristics and dynamic properties of acoustic/elastic metamaterials has been reported,the practical design and application of these composite structures for real-life engineering problems still remain unexplored.The present study intends to investigate a potential application of dissipative elastic metamaterials in controlling the bearing-generated vibration and noises over an ultrawide frequency range.The study is based on a simple analytical model together with rigorous finite element numerical simulations.It has been established that the dissipative characteristic of resonant system caused by larger material mismatch broadens the local resonance bandgaps beyond the bounding resonance frequency at the cost of wave transmission.In order to achieve broadband vibration and noise control,multi-resonant composite structures are embedded inside the bearing housing in five different layers.The reported results revealed the presence of broadband wave attenuation zone distributed from 3 to 52 kHz with consideration of material damping.The bearing-generated vibration and noises lying inside the wave attenuation zone will be mitigated.This feasibility study provides a new concept for the design and application of acoustic/elastic metamaterials in the bearing industry to improve machine service life and to enhance productivity and passenger comfort. | Muhammad C.W.Lim N.S.Vyas | 2021 | Acta Mechanica Solida Sinica2021，34，4： | 0 |
| 7 | 基于ANSYS的风电机组叶片的建模研究显示文摘1引言
风能是一种可再生能源,其蕴藏量和开发利用潜力巨大.随着风能市场的迅速发展,国内己有众多厂家生产风力发电设备,叶片是风电机组的重要组成部分,但国内对叶片的结构分析尚未成熟. | 曾庆川 孙方方 C.W.Lim 杨云胜 | 2010 | 风能2010，，11： | 0 |
| 8 | Dynamic Response of Composite Materials with 2D Reduced Micromorphic Model显示文摘In this article,we introduce a complete set of constitutive relations and field equations for the linear reduced micromorphic model.We further investigate the internal variables and their relationship in the case of two-dimensional(2D)wave propagation.The dynamic response is investigated for composite materials,which is due to an external wave in two dimensions applied at the boundary of the considered domain.Analytical solutions for the model are unavailable at this stage due to dependency of the field equations on spatial and time variables in a complicated manner.A finite element approach is adopted to derive approximate solutions for the field equations,and numerical finite element solutions for the internal fields are presented in detail and discussed. | A.R.El Dhaba C.W.Lim | 2022 | Acta Mechanica Solida Sinica2022，35，4： | 0 |
| 9 | Nonlinear in-plane thermal buckling of rotationally restrained functionally graded carbon nanotube reinforced composite shallow arches under uniform radial loading显示文摘The nonlinear in-plane instability of functionally graded carbon nanotube reinforced composite(FG-CNTRC)shallow circular arches with rotational constraints subject to a uniform radial load in a thermal environment is investigated.Assuming arches with thickness-graded material properties,four different distribution patterns of carbon nanotubes(CNTs)are considered.The classical arch theory and Donnell’s shallow shell theory assumptions are used to evaluate the arch displacement field,and the analytical solutions of buckling equilibrium equations and buckling loads are obtained by using the principle of virtual work.The critical geometric parameters are introduced to determine the criteria for buckling mode switching.Parametric studies are carried out to demonstrate the effects of temperature variations,material parameters,geometric parameters,and elastic constraints on the stability of the arch.It is found that increasing the volume fraction of CNTs and distributing CNTs away from the neutral axis significantly enhance the bending stiffness of the arch.In addition,the pretension and initial displacement caused by the temperature field have significant effects on the buckling behavior. | Cheng LI Chengxiu ZHU C.W.LIM Shuang LI | 2022 | Applied Mathematics and Mechanics(English Edition)2022，43，12： | 0 |
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