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vibrational characteristics of rotating soft cylinders

Science China(Physics,Mechanics & Astronomy) 2021年第5期64卷 34-42页

作者： Kecheng Li Yinnan Zhang Haifei Zhan Yangkun Du Chaofeng Li College of Ciwil Engineering and Architecture Zhejiang UniversiyHangzhou 310058China School of Mathematics and Staristics University of GlasgowGlasgow G128QQUK Key Lab of Soft Machines and Smart Devices of Zhejiang Province Zhejiang UniversiyHangzhou 310027China Soft Matter Research Center Zhejiang University Hangzhou 310027China

Rotating structural components are omnipresent in engineering structures and natural world. This work investigates the effects of the centrifugal and Coriolis forces on the free vibrational characteristics of soft cylinders rotating with respect to the axis of symmetry based on the nonlinear elasticity and linear incremental theories. The formulations indicate that the biasing deformation, instantaneous elastic moduli, and incremental equations of motion strongly depend on the rotating speed. The characteristic equation for the natural frequency is derived using the state-space method and approximate laminate *** numerical examples included in this work demonstrate that the centrifugal and Coriolis forces might have significant effects on the vibrational characteristics of the cylinder. Results of this work will benefit the design and control of novel engineering systems with rotating soft cylinders or shafts.

关键词： rotating soft cylinders vibrational characteristics centrifugal force Coriolis force

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Ultrafast multiplex CARS investigation of vibrational characteristics in chloroform and PMMA

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Chinese Physics B 2009年第4期18卷 1463-1468页

作者：王英惠彭亚晶何兴宋云飞杨延强 Center for Condensed Matter Science and Technology Department of Physics Harbin Institute of Technology

This paper demonstrates the femtosecond time-resolved coherent anti-Stokes Raman scattering by using folded BOXCARS geometry where an ultrashort broadband coherent white light continuum was used as Stokes pulse, and carries out the non-contact detection at long distance, The CARS signal is so easy to be detected that it can be seen even by nude eye. The C-H bonds of chloroform or PMMA were detected and the vibration modes belonging to the side chain and the main chain in PMMA were also compared. Their vibrational characteristics involved decay process and quantum beating were discussed. This modified CARS experimental technique could make up the deficiency of traditional CARS technique.

关键词： femtosecond ultrafast CARS vibrational characteristics

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Effect of size polydispersity on the structural and vibrational characteristics of two-dimensional granular assemblies

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Chinese Physics B 2014年第7期23卷 589-595页

作者：张国华孙其诚石志萍冯旭顾强金峰 Department of Physics University of Science and Technology Beijing State Key Laboratory for Hydroscience and Engineering Tsinghua University

Two-dimensional disordered granular assemblies composed of 2048 polydispersed frictionless disks are simulated using the discrete element method. The height of the first peak of the pair correlation function, gl, the local and global bond orientational parameters ψ6^1 and ψ6^g, and the fluctuations of these parameters decrease with increasing polydispersity s, implying the transition from a polycrystalline state to an amorphous state in the system. As s increases, the peak position of the boson peak aJBp shifts towards a lower frequency and the intensity of the boson peak D（ωBP）/ωBp increases, indicating that the position and the strength of the boson peak are controlled by the polydispersity of the system. Moreover, the inverse of the boson peak intensity ωBP/D（ωBP）, the shear modulus G, and the basin curvature SIS all have a similar dependence on s, implying that the s dependence of the vibrational density of states at low frequencies likely originates from the s dependence of the basin curvature.

关键词： granular matter vibrational characteristics size polydispersity structural characteristics

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