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Multi-layer quasi-zero-stiffness meta-structure for high-efficiency vibration isolation at low frequency

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applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1189-1208页

作者： Jiahao ZHOU Jiaxi ZHOU Hongbin PAN Kai WANG Changqi CAI guilin WEN college of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body The Ministry of Science and TechnologyChangsha410082China School of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou310018China School of Mechanical Engineering Yanshan UniversityQinhuangdao066004Hebei ProvinceChina

An easily stackable multi-layer quasi-zero-stiffness(ML-QZS)meta-structure is proposed to achieve highly efficient vibration isolation performance at low ***,the distributed shape optimization method is used to design the unit cel,i.e.,the single-layer QZS(SL-QZS)***,the stiffness feature of the unit cell is investigated and verified through static ***,the unit cells are stacked one by one along the direction of vibration isolation,and thus the ML-QZS meta-structure is ***,the dynamic modeling of the ML-QZS vibration isolation metastructure is conducted,and the dynamic responses are obtained from the equations of motion,and verified by finite element(FE)***,a prototype of the ML-QZS vibration isolation meta-structure is fabricated by additive manufacturing,and the vibration isolation performance is evaluated *** results show that the vibration isolation performance substantially enhances when the number of unit cells *** importantly,the ML-QZS meta-structure can be easily extended in the direction of vibration isolation when the unit cells are properly ***,the ML-FQZS vibration isolation meta-structure should be a fascinating solution for highly efficient vibration isolation performance at low frequency.

关键词： quasi-zero stiffness(QZS) meta-structure high efficiency low frequency vibration isolation

Application of Ice Pigging in a Drinking Water Distribution System:Impacts on Pipes and Bulk Water Quality

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Engineering 2024年第9期40卷 122-130页

作者： Yujing Huang Zhiwei Chen guilin He Yu Shao Shuang Song Feilong Dong Tuqiao Zhang college of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310027China Suzhou Wuzhong Water Co. Ltd.Suzhou 215128China School of Municipal and Environmental Engineering Shandong Jianzhu UniversityJi’nan 250101China college of Environment Zhejiang University of TechnologyHangzhou 310014China

Ice pigging is an emerging technique for pipe cleaning in drinking water distribution ***,substantial confusion and controversy exist on the potential impacts of ice pigging on bulk water *** study monitored the microstructural features and composition of sediments and microbial community structures in bulk water in eight multimaterial Chinese *** concentration analysis demonstrated that separate cleaning of pipes with different materials in complex networks could mitigate the risk of losing ice pigs and degrading water *** microstructural and trace element characterization results showed that ice pigs would scarcely disturb the inner surfaces of long-used *** bacterial richness and diversity of bulk water decreased significantly after ice ***,correlations were established between pipe service age,temperature,and chloride and total iron concentrations,and the 15 most abundant taxa in bulk water,which could be used to guide practical ice pigging operations.

关键词： Ice pigging Pipe cleaning Drinking water distribution system Bacterial community Sediments

Special Issue for the 50th Anniversary of the Founding of university of electronic science and technology of china

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Journal of electronic science and technology of china 2006年第3期4卷 I0001-I0002页

作者： Journal of electronic science and technology of china

The special issue of this Journal has been organized for the celebration of the 50th anniversary of the founding of university of electronic science and technology of china （UESTC）.

关键词： Special Issue for the 50th Anniversary of the Founding of university of electronic science and technology of china

Magnetic Field Controllable Photocurrent Properties in BiFe_(0.9)Ni_(0.1)O_(3)/La_(0.7)Sr_(0.3)MnO_(3) Laminate Thin Film

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Energy & Environmental Materials 2024年第2期7卷 381-388页

作者： Guanzhong Huo Ke Wang Qingying Ye Shuiyuan Chen Chao Su Yuxiang Zhang guilin Chen Zhigao Huang Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhou 350117China Fujian Provincial Engineering technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou 350117China

This paper reports a multifunctional magnetic-photoelectric laminate device based on the integration of spintronic material(La_(0.7)Sr_(0.3)MnO_(3))and multiferroic(Ni-doped BiFeO_(3)),in which the repeatable modulation effect on the photoelectric properties were achieved by applying external magnetic *** obviously,photocurrent density(J)of the laminate was largely enhanced,the change rate of J up to 287.6%is *** sensing function effect should be attributed to the low-field magnetoresistance effect in perovskite manganite and the scattering of spin photoelectron in multiferroic *** laminate perfectly combines the functions of sensor and controller,which can not only reflect the intensity of environmental magnetic field,but also modulate the photoelectric conversion *** work provides an alternative and facile way to realize multi-degree-of-freedom control for photoelectric conversion performances and lastly miniaturize multifunction device.

关键词： bismuth ferrite low-field magnetoresistance effect magnetic field modulation perovskite manganite photocurrent

Comprehensive study on fail-safe topological design method for 3D structures

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Acta Mechanica Sinica 2024年第6期40卷 87-99页

作者： Hongxin Wang Yujun Liao guilin Wen Liangliang Chen Jie Liu Center for Research on Leading technology of Special Equipment School of Mechanical and Electric EngineeringGuangzhou UniversityGuangzhou510006China Department of Rehabilitation Medicine The Fifth Affiliated Hospital of Guangzhou Medical UniversityGuangzhou510735China Hebei Innovation Center for Equipment Lightweight Design and Manufacturing School of Mechanical EngineeringYanshan UniversityQinhuangdao066004China

Fail-safe topology optimization is valuable for ensuring that optimized structures remain operable even under damaged *** selectively removing material stiffness in patches with a fixed shape,the complex phenomenon of local failure is modeled in fail-safe topology *** this work,we first conduct a comprehensive study to explore the impact of patch size,shape,and distribution on the robustness of fail-safe *** findings suggest that larger sizes and finer distribution of material patches can yield more robust fail-safe ***,a finer patch distribution can significantly increase computational costs,particularly for 3D *** keep computational efforts tractable,an efficient fail-safe topology optimization approach is established based on the framework of multi-resolution topology optimization(MTOP).Within the MTOP framework,the extended finite element method is introduced to establish a decoupling connection between the analysis mesh and the topology description *** examples demonstrate that the developed methodology is 2 times faster for 2D problems and over 25 times faster for 3D problems than traditional fail-safe topology optimization while maintaining similar levels of robustness.

关键词： Robust design Fail-safe structures Multi-resolution topology optimization Computational efficiency XFEM

Computation Offloading in Edge Computing for Internet of Vehicles via Game Theory

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Computers, Materials and Continua 2024年第1期81卷 1337-1361页

作者： Liu, Jianhua Wei, Jincheng Luo, Rongxin Yuan, guilin Liu, Jiajia Tu, Xiaoguang Institute of electronic and Electrical Engineering Civil Aviation Flight University of China Guanghan 618307 China

With the rapid advancement of Internet of Vehicles (IoV) technology, the demands for real-time navigation, advanced driver-assistance systems (ADAS), vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications, and multimedia entertainment systems have made in-vehicle applications increasingly computingintensive and delay-sensitive. These applications require significant computing resources, which can overwhelm the limited computing capabilities of vehicle terminals despite advancements in computing hardware due to the complexity of tasks, energy consumption, and cost constraints. To address this issue in IoV-based edge computing, particularly in scenarios where available computing resources in vehicles are scarce, amulti-master andmulti-slave double-layer game model is proposed, which is based on task offloading and pricing strategies. The establishment ofNash equilibriumof the game is proven, and a distributed artificial bee colonies algorithm is employed to achieve game equilibrium. Our proposed solution addresses these bottlenecks by leveraging a game-theoretic approach for task offloading and resource allocation in mobile edge computing (MEC)-enabled IoV environments. Simulation results demonstrate that the proposed scheme outperforms existing solutions in terms of convergence speed and system utility. Specifically, the total revenue achieved by our scheme surpasses other algorithms by at least 8.98%. © 2024 The Authors.

关键词： Advanced driver assistance systems

Analysis on the positioning precision of CAPS

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science china(Physics,Mechanics & Astronomy) 2009年第3期52卷 328-332页

作者： JI YuanFa1,2 & SUN XiYan1,2 1 National Astronomical Observatories, Chinese Academy of sciences, Beijing 100012, china 2.applied science and technology college, guilin university of electronic technology, guilin 541004, china 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. applied science and technology college Guilin University of Electronic Technology Guilin 541004 China

As a newly developed satellite positioning system, the Chinese Area Positioning System (CAPS) is a typical direct sequence spread spectrum ranging system like GPS. The positioning precision of such navigation signals depends on many factors, including the pseudo-code rate, the signal to noise ratio, the processing methods for tracking loops and so on. This paper describes the CAPS link budget, the solution approach for CAPS positioning, focusing on the autocorrelation function feature of C/A code signals. The CAPS signal measurement precision is studied by the software approach together with theoretical analysis of the range resolution. Because the conventional Delay Lock Loop (DLL) is vul- nerable to the impact of noise, a narrow correlator and multiple correlators as well as the corresponding discrimination methods of phases are proposed, which improves the robustness of DLL and the code-phase resolution of the measurement. The results show that the improvement of the DLL structure and the discrimination method are the most important way to improve the ranging resolution. Theoretical analysis and experimental results show that a CAPS receiver could reach a 20-m positioning precision by using three satellites with a supported height from an altimeter.

关键词： satellite navigation receiver narrow correlation tracking loop

Bifurcation of travelling wave solutions for (2+1)-dimension nonlinear dispersive long wave equation

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applied Mathematics(A Journal of Chinese Universities) 2009年第3期24卷 291-297页

作者： RONG Ji-hong TANG Sheng-qiang School of Mathematics and Computing science,guilin university of electronic technology,guilin541004,china School of Mathematics and Computing science Guilin University of Electronic Technology Guilin 541004 China

In this paper,the bifurcation of solitary,kink,anti-kink,and periodic waves for （2＋1）-dimension nonlinear dispersive long wave equation is studied by using the bifurcation theory of planar dynamical *** parameter sets are shown,and under various parameter conditions,all exact explicit formulas of solitary travelling wave solutions and kink travelling wave solutions and periodic travelling wave solutions are listed.

关键词： solitary wave kink and anti-kink wave periodic wave (2+1)-Dimension nonlinear dispersive long wave equation

Number of zero point for a polynomial in real field

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Chinese science Bulletin 1997年第11期42卷 886-890页

作者： LIN Liang and LIU Yirong1. guilin Institute of technology, guilin 541004, china 2. Central South university of technology, Changsha 410083, china guilin Institute of technology Guilin 541004 China

IT is well known that for any real coefficient polynomial f(x) of degree n,how to determineits number of real zero points is a very important problem in theory of polynomial,as well as inapplications in mathematics,mechanics,physics and other *** way to solve thisproblem by using Euclidean mutual division as pointed out by Sturm is not simple and conve-nient for us to use the theoretic analyses for the above problem because the relation

关键词： polynomial real zero point coefficients.