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Numerical analysis of three-dimensional thermo-elastic rolling contact under steady-state conditions

Friction 2022年第4期10卷 630-644页

作者： Yonghun YU junho suh Department of Mechanical Engineering Pusan National UniversityBusan SW72AZRepublic of Korea

In this study,a three-dimensional thermo-elastic model that considers the interaction of mechanical and thermal deformation is developed using a semi-analytic method for steady-state rolling *** types in all directions are considered in this *** verification,the numerical analysis results of shear traction and temperature increase are compared separately with existing numerical results,and the consistency is *** analysis results include heat flux,temperature increase,contact pressure,and shear *** severe rolling conditions,the thermal effect changes the behavior of the contact interface ***,the effects of creepage,rolling speed,and conformity under different rolling and creep conditions are investigated.

关键词： creep frictional heat rolling contact spin thermal deformation

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Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging

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Light(Science & Applications) 2023年第2期12卷 304-313页

作者： Yongjin Na Hyunsoo Kwak Changmin Ahn Seung Eon Lee Woojin Lee Chu-Shik Kang Jungchul Lee junho suh Hongki Yoo Jungwon Kim Korea Advanced Institute of Science and Technology(KAIST) Daejeon 34141Korea Korea Research Institute of Standards and Science(KRISS) Daejeon 34113Korea

High-speed and high-resolution imaging of surface profiles is critical for the investigation of various structures and mechanical dynamics of micro-and nano-scale *** particular,recent emergence of various nonlinear,transient and complex mechanical dynamics,such as anharmonic vibrations in mechanical resonators,has necessitated real-time surface deformation imaging with higher axial and lateral resolutions,speed,and dynamic ***,real-time capturing of fast and complex mechanical dynamics has been challenging,and direct time-domain imaging of displacements and mechanical motions has been a missing element in studying full-field structural and dynamic ***,by exploiting the electro-optic sampling with a frequency comb,we demonstrate a line-scan time-of-flight(TOF)camera that can simultaneously measure the TOF changes of more than 1000 spatial coordinates with hundreds megapixels/s pixel-rate and sub-nanometre axial resolution over several millimetres *** unique combination of performances enables fast and precise imaging of both complex structures and dynamics in three-dimensional devices and mechanical resonators.

关键词： deformation dimensional dynamics

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