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Effect of densification process on mechanical enhancement of graphene laminates 认领 引用
1
作者 Yue Zhu Yalong Liao +6 位作者 Meng Wang Jingxin Dai Chaoshuai Lei Xiaobo Liu Pengyu Mu Wenjing Li Hao Zhang 《Nano Materials Science》 EI CAS CSCD 2025年第2期240-248,共9页
Graphene nanosheets have attracted great attention in the field of nanotechnology applications due to their extraordinary mechanical properties.While the structural defects such as gaps will occur during the preparati... Graphene nanosheets have attracted great attention in the field of nanotechnology applications due to their extraordinary mechanical properties.While the structural defects such as gaps will occur during the preparation of graphene laminates,which will greatly damage the performance of the macroscopic material.Hence,a simple and promising mechanical compression method is used to improve the mechanical properties of graphene laminates.However,the roles of the densification process in the mechanical enhancement mechanism of graphene laminates are not clear.In our work,the mechanical enhancement of the compressed graphene(PG)laminates was investigated by the coarse-grained molecular dynamics simulation method.The tensile strength of PG model could be increased by increasing the graphene nanosheet size and the degree of compression in the system.And the model has the stronger van der Waals effect between graphene sheets due to the larger graphene size as well as the higher overlap ratio.Furthermore,two kinds of PG laminates were prepared by densification method,and the tensile strength was consistent with the upward trend of the PG model.This work provides an in-depth understanding on the mechanical enhancement of the densification process and lays a foundation for the future practical application of graphene laminates. 展开更多
关键词 Graphene Mechanical compression Tensile strength Structural design Molecular dynamics simulation
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An adaptive active vibration suppression method for diverse wind tunnel aircraft models 认领 引用
2
作者 Mengde ZHOU Chenjin SUN +4 位作者 Qi ZHAO Binkai ZHU Wei WU Yuhang REN Wei LIU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期370-384,共15页
Under the condition of frequent replacement of wind tunnel models,multiple types of wind tunnel models are fixed by a slender support sting with low stiffness damping.When excited by wind load,various models produce r... Under the condition of frequent replacement of wind tunnel models,multiple types of wind tunnel models are fixed by a slender support sting with low stiffness damping.When excited by wind load,various models produce random multi-dimensional vibration with different characteristics,which makes it impossible to obtain accurate and efficient aerodynamic data.Therefore,in order to ensure the reliable and efficient conduction of wind tunnel test,a wind-tunnel-modeladaptive vibration control method is proposed in this paper.First,the split type adaptive vibration suppression structure is designed.Second,the multi-dimensional vibration characteristic characterization method is derived and the vibration characteristic identification method of the system is designed.Then,a vibration state estimation model is established according to the identification results of vibration characteristics,and a multi-actuator cooperative control method based on vibration state estimation is constructed.Finally,a model-adaptive vibration control system is built,and vibration characteristics identification and hammer experiments are carried out for two types of typical models.The results show that the proposed model-adaptive vibration control method increases the equivalent damping ratio of pitch and yaw dimensions of the high-aspect-ratio class model by 8.19 times and 48.81 times,respectively.The equivalent damping ratio of pitch and yaw dimensions of the highslenderness-ratio class model is increased by 16.44 and 5.43 times,respectively.It provides a strong guarantee for the reliable and efficient development of multi-type wind tunnel test tasks. 展开更多
关键词 Active damping Model support system Vibration characteristic identification Vibration control Vibration state estimation Wind tunnels
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Ultrabroadband chiral metasurface for linear polarization conversion and asymmetric transmission based on enhanced interference theory 认领 引用 被引量：4
3
作者 赵京城 李南 程用志 《Chinese Optics Letters》 SCIE EI CAS CSCD 2023年第11期147-154,共8页
In this paper,we propose an ultrabroadband chiral metasurface(CMS)composed of S-shaped resonator structures situated between two twisted subwavelength gratings and dielectric substrate.This innovative structure enable... In this paper,we propose an ultrabroadband chiral metasurface(CMS)composed of S-shaped resonator structures situated between two twisted subwavelength gratings and dielectric substrate.This innovative structure enables ultrabroadband and high-efficiency linear polarization(LP)conversion,as well as asymmetric transmission(AT)effect in the microwave region.The enhanced interference effect of the Fabry-Perot-like resonance cavity greatly expands the bandwidth and efficiency of LP conversion and AT effect.Through numerical simulations,it has been revealed that the cross-polarization transmission coefficients for normal forward(-z)and backward(+z)incidence exceed 0.8 in the frequency range of 4.13 to 17.34 GHz,accompanied by a polarization conversion ratio of over 99%.Furthermore,our microwave experimental results validate the consistency among simulation,theory,and measurement.Additionally,we elucidate the distinct characteristics of ultrabroadband LP conversion and significant AT effect through analysis of polarization azimuth rotation and ellipticity angles,total transmittance,AT coefficient,and electric field distribution.The proposed CMS structure shows excellent polarization conversion properties via AT effect and has potential applications in areas such as radar,remote sensing,and satellite communication. 展开更多
关键词 chiral metasurface linear polarization conversion asymmetric transmission Fabry-Perot-like resonance electromagnetic interference model
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