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Multi-physics analysis of a 325 MHz bi-periodic on-axis coupled accelerating structure

Radiation Detection Technology and Methods 2017年第2期1卷 81-85页

作者： Guan Shu Jing-Ru Zhang Xiao-Tong Zhang Hao-Wei Yuan Yun-Long Chi Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose A 325-MHz bi-periodic on-axis coupled accelerating structure prototype which consists of two bi-periodic accelerating modules is under fabrication in the Institute of High Energy Physics,Beijing,dedicated to a 10-MeV/100 kW industrial linear electron *** to the beam dynamics study,the average power dissipated in the prototype cavity is about 19.1 *** cooling scheme is one of the most important issues in the high-power *** This paper mainly deals with the RF,thermal and structural coupled analyses of the accelerating structure prototype with the help of the ANSYS *** cooling scheme is optimized to minimize the temperature rise,displacement and von Mises *** The temperature and stress distributions in the steady state are *** maximum von Mises stress is much lower than the yield strength limit of the corresponding *** frequency shift caused by the thermal expansion is calculated as well,which is within the scope of the tuning *** The coupled analyses based on the ANSYS software package are presented to design and optimize the cooling scheme of the accelerating *** von Mises stresses are much lower than the yield strength limit of the *** calculation results indicate that our cooling scheme can deal with the dissipated RF power efficiently.

关键词： bi-periodic On-axis Industrial accelerator Multi-physics analysis

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Research on vibration suppression of a mistuned blisk by a piezoelectric network

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Chinese Journal of Aeronautics 2018年第2期31卷 285-299页

作者： Jiuzhou LIU Lin LI Yu FAN Pengcheng DENG School of Energy and Power Engineering Beihang University 100083 Beijing China Collaborative Innovation Center for Advanced Aero-Engine 100083 Beijing China Beijing Key Laboratory of Aero-engine Structure and Strength 100083 Beijing China Beijing Institute of Space Launch Technology 100076 Beijing China

The work aims to provide a further investigation of the dynamic characteristics of an integral bladed disk（also called ‘blisk＇） with a Parallel Piezoelectric Network（PPN）. The PPN is constructed by parallelly interconnecting the piezoelectric patches distributed in the blisk. Two kinds of PPN are considered, namely mono-periodic PPN and bi-periodic PPN. The former has a piezoelectric patch in each sector, and the later has one patch every few sectors. The vibration suppression performance of both kinds of PPN has been studied through modal analysis, forced response analysis, and statistical analysis. The research results turn out that the PPN will only affect mechanical frequencies near the electrical frequency clusters slightly, and the bi-periodic PPN will make the nodal diameter spectrum of the modes more complex, but the amplitude corresponding to the new nodal diameter component is much smaller than that of the nodal diameter component corresponding to the mono-periodic system. The mechanical coupling between the blades and the disk plays an important role in the damping effect of the PPN, and it should be paid attention to in applications. The mono-periodic PPN can effectively suppress the amplitude magnification of the forced response induced by the mistuning of the blisk; meanwhile, it can mitigate the vibration localization of the mistuned electromechanical system. If piezoelectric patches are set only in part of the sectors, the bi-periodic PPN still has a vibration suppression ability, but the effect is related to the number and spatial distribution of the piezoelectric patches.

关键词： Amplitude magnification bi-periodic Blisk Mistuning Mono-periodic Parallel piezoelectric network Statistical analysis Vibration suppression

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