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Investigation of Induced Unbalance Magnitude on Dynamic Characteristics of High-speed Turbocharger with Floating Ring Bearings

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Chinese Journal of Mechanical Engineering 2018年第5期31卷 99-109页

作者： Guang-Fu Bin Yuan Huang shuai-ping guo Xue-Jun Li Gang Wang Health Maintenance for Mechanical Equipment Key Lab of Hunan Province Hunan University of Science and Technology Xiangtan 411201 China Department of Mechanical and Aerospace Engineering The University of Alabama in Huntsville AL 35899 USA

Due to operational wear and uneven carbon absorption in compressor and turbine wheels, the unbalance(me) vibration is induced and could lead to sub?synchronous vibration accidents for high?speed turbocharger(TC). There are very few research works that focus on the magnitude e ects on such induced unbalance vibration. In this paper, a finite element model(FEM) is developed to characterize a realistic automotive TC rotor with floating ring bearings(FRBs). The nonlinear dynamic responses of the TC rotor system with di erent levels of induced unbalance magni?tude in compressor and turbine wheels are calculated. From the results of waterfall and response spectral intensity plots, the bifurcation and instability phenomena depend on unbalance magnitude during the startup of TC. The sub?synchronous component 0.12× caused rotor unstable is the dominant frequency for small induced unbalance. The nonlinear e ects of induced unbalance in the turbine wheel is obvious stronger than the compressor wheel. As the unbalance magnitude increases from 0.05 gbration 1·mm to 0.2 g·mm, the vibration component changes from mainly 0.12× to synchronous vi×. When unbalance increases continuously, the rotor vibration response amplitude is rapidly growing and the 1× caused by the large unbalance excitation becomes the dominant frequency. A suitable un?balance magnitude of turbine wheel and compressor wheel for the high?speed TC rotor with FRBs is proposed: the value of induced un?balance magnitude should be kept around 0.2 g·mm.

关键词： High?speed TC with FRBs Induced unbalance magnitude Nonlinear dynamic response Sub?synchronous vibration Stability

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Experiment of Dividing the Active Blocks Based on Horizontal Crustal Movement Observed by GPS

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Earthquake Research in China 2000年第4期14卷 32-37页

作者： Li Yanxing, Hu Xinkang, shuai ping and guo LiangqianFirst Crustal Deformation Monitoring Center, CSB, Tianjin 300180, China First Crustal Deformation Monitoring Center CSB Tianjin 300180 China

In this paper, the discrepancy between the movements of intraplate blocks and plates isdiscussed, and the method to divide the intraplate active blocks is presented by selecting Bursaformula as the kinematic model for the intraplate blocks. Based on the data of three GPScampaigns in North-China network in l995, 1996 and l999, respectively, the northern area inNorth China is divided into eight small blocks with the mathematical model and methodpresented in this paper. The divided blocks based on tbe horizontal and vertical crustalmovements in the paper are consistent or approximate with each other in the area as a *** divided blocks in the paper is also basically accordant with the neotectonic movement,which indicates that the current movement of active blocks in this area is the succession anddevelopment of neotectonic movement. Moreover, some new activity characteristics in the areahave been revealed by the tectonic units divided with the horizontal crustal movement.

关键词： Horizontal movement Mathematical model Block division

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Perovskite LiBaH3 for photo-assisted dinitrogen fixation

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Science China Chemistry 2025年

作者： Kaixun Cui Yeqin Guan Yongli Cai Runze Wang Qianru Wang Wenbo Gao Jianping guo ping Chen Department of Chemical Physics University of Science and Technology of China Dalian Institute of Chemical Physics Chinese Academy of Sciences Center of Materials and Optoelectronics Engineering University of Chinese Academy of Sciences

Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild conditions. Recent researches disclose unique functionalities of binary alkali and alkaline earth metal hydrides in mediating ammonia synthesis. Thanks to the rich compositional and structural properties of the metalhydrogen system, we herein report that LiBaH3, as a narrow band gap perovskite hydride, exhibits a strong response to visible light illumination. Specifically, hydridic hydrogen undergoes reductive elimination of producing H2and creates an electron-rich surface. Such an environment favors dinitrogen fixation to form N–H bonds. Based on this chemical property, a chemical looping ammonia synthesis process mediated by LiBaH3and driven by both photo and thermal energies was proposed and *** work demonstrates that hydride perovskites are promising candidates for mediating photo-assisted nitrogen fixation reactions.

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Insight into the particle shape on the impact of dry granular flow against a rigid barrier: A DEM study

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Journal of Earth Science 2025年

作者： Rui-Xiao Zhan Dong Su Xiang-Sheng Chen Yuan-Jun Jiang guo-ping Lei Jing-Jing Yu Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE)， Shenzhen University College of Civil and Transportation Engineering， Shenzhen University School of Architecture and Urban Planning， Shenzhen University Shenzhen Key Laboratory of Green， Efficient and Intelligent Construction of Underground Metro Station， Shenzhen University Institute of Mountain Hazards and Environment， Chinese Academy of Sciences School of Transportation， Civil Engineering & Architecture， Foshan University

The effect of particle shape on the impact of dry granular flow remains an open area for further investigation. Five distinct particle shapes were examined in this study using discrete element simulations after calibrating the numerical model using a published work. The findings indicated that the particle shape had a significant influence on granular mobility. With negligible variations in normalized kinetic energy between particles of different shapes， the effect of particle shape on the increasing rate of kinetic energy became more obvious. All irregular particle scenarios had longer accumulated particle lengths down the channel than spherical particles. Variations in particle shape led to adjustments in the distribution of impact forces on the barrier. These findings substantially enhance our understanding of the distinctive effects of particle shapes on the impact mechanism of dry granular flow.

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Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

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Science China Chemistry 2025年第1期68卷 288-296页

作者： shuai Liu Wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen Chang Hong-Yu Tang Chun-Mao Yuan Jun-Bo Yang Zhi-Li Zuo Han guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词： metabolon Diels-Alder reaction semipinacol rearrangement biosynthesis notoamides spiro polycyclic alkaloids

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一种新型风力发电机

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微电机 2004年第4期37卷 6-8页

作者：李帅彭国平鱼振民易萍虎西安交通大学陕西西安710049

现有的小型风力发电系统技术上已相当成熟,但其所用的发电机存在一些缺点与不足。文中提出一种新型风力发电机,对其设计做了论述,并通过对样机的实验,证明了方案的可行性。

关键词：风力发电机小型风力发电系统样机技术可行性成熟

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反向侵蚀引发管涌的实验与数值分析研究

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水利技术监督 2025年第1期 200-204页

作者：郭帅忻州水利建设投资有限公司山西忻州034000

本研究旨在探讨非均质砂土中向后侵蚀管涌的形成机制及其对挡水结构稳定性的影响。通过小尺度实验,研究了微观和宏观非均质性对向后侵蚀管涌形成的影响,并结合二维和三维地下水流模型进行数值模拟。结果表明,宏观非均质性导致管涌阻力... 详细信息

本研究旨在探讨非均质砂土中向后侵蚀管涌的形成机制及其对挡水结构稳定性的影响。通过小尺度实验,研究了微观和宏观非均质性对向后侵蚀管涌形成的影响,并结合二维和三维地下水流模型进行数值模拟。结果表明,宏观非均质性导致管涌阻力显著增加,这不仅与粒径变化有关,还与横向侵蚀通道对渗流模式的影响相关。这一发现对于理解和预测挡水结构在非均匀地质条件下的破坏机制具有重要意义,有助于改进洪水灾害和风险映射的准确性。

关键词：侵蚀管涌非均质模型试验临界水头

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Proper Management of the Asia-Pacific Affairs—— On the Division-and-integration of the Asia-Pacific Region and the Regional Integration Strategy

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学术界 2015年第8期 257-261页

作者： Shao shuai guo ping Department of Maritime Law Dalian Maritime University

The international administrative theory is the essential tool of the international and regional integration,but it lacks macro reference of history. Based on the regional society system of ancient China,this paper discusses international administrative tools including countries,nations and people,and makes comparison of the economic capital,administrative organization and institutional norm of Europe,America and Asia. Through research,this paper concludes that the regional theory of China has both historic and practical significance.

关键词：区域一体化国际管理亚太地区事务行政组织历史意义社会系统工具包

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The Impact of Tidal Migration of Hot Jupiters on the Rotation of Sun-like Main-sequence Stars

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Research in Astronomy and Astrophysics 2023年第9期23卷 148-161页

作者： shuai-shuai guo Yunnan Observatories Chinese Academy of SciencesKunming 650011China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Key Laboratory for the Structure and Evolution of Celestial Objects CASKunming 650011China

The tidal interactions of planets affect the stellar evolutionary status and the constraint of their physical parameters by *** this work,we incorporate the tidal interaction and magnetic braking of the stellar wind into MESA and calculate a large grid of 25,000 models,covering planets with masses of 0.1–13.0MJ with different orbital distances that orbit late-type stars of different *** also explore the effect of different stellar initial rotations on the tidal *** results show that in the case of tidal inward migration,the stellar rotation periods are always lower than that of the star without planet before the planet is engulfed and the difference in the rotation period of its host star always increases with *** the planet is engulfed,the stellar rotation periods are still lower than that of star without planet,but the difference of periods can be quickly eliminated if the star has a thick convective envelope(smaller mass and larger metallicity),regardless of the mass of the planet and the initial rotation period of the *** the case of stars with thinner convective envelopes(larger mass and smaller metallicity),the stars will be spun up and remain the faster rotation in a long ***,the planet is easily swallowed and the period differences are large if the initial rotation period of its host star is ***,we also study the evolution of WASP-19 and estimate the range of tidal quality parameter Q_(*)^(')=(4.6±0.9)×10^(6)and the initial semimajor axis as(0.035±0.004)au.

关键词： stars rotation-stars solar-type-planet-star interactions

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防隔水煤柱定向爆破应力转移机理及参数优化设计

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河南理工大学学报（自然科学版） 2025年第1期44卷 1-9页

作者：刘少伟郭泽政冯超牛帅河南理工大学能源科学与工程学院河南焦作454000 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454000 安阳工学院土木与建筑工程学院河南安阳455000

目的针对内部存在断层的防隔水煤柱在采动影响下应力场持续变化对其稳定性和工作面安全开采造成极大威胁的问题,方法以鹤壁中泰矿业有限公司3309工作面为工程地质背景,采用理论分析、正交试验和FLAC3D数值模拟试验,研究定向爆破应力转... 详细信息

目的针对内部存在断层的防隔水煤柱在采动影响下应力场持续变化对其稳定性和工作面安全开采造成极大威胁的问题,方法以鹤壁中泰矿业有限公司3309工作面为工程地质背景,采用理论分析、正交试验和FLAC3D数值模拟试验,研究定向爆破应力转移保护防隔水煤柱的影响因素以及不同切顶深度和切顶角度下防隔水煤柱内部应力分布特征。结果结果表明:随着切顶角度和切顶深度增加,垂直应力集中区逐渐向深部转移,但当切顶深度和切顶角度达到一定数值后,继续增加切顶角度或切顶深度对应力集中区位置及垂直应力峰值影响不再明显,对比不同方案防隔水煤柱内部测线数据可知,当切顶深度为15 m、切顶角度为15°时,应力集中区距回风巷距离最远,最远距离为19.76 m,应力峰值最小,最小值为15.65 MPa。结论采用定向爆破技术可以实现切顶卸压应力转移,能够阻断回风巷上覆岩层与防隔水煤柱周边岩层的联系,将防隔水煤柱靠近回风巷一侧应力向深部转移,以减少采动对防隔水煤柱的影响;现场工业性试验结果验证了选定方案切顶深度15 m、切顶角度15°的合理性,防隔水煤柱内部实现了应力转移,选定方案的成功应用有效提高了防隔水煤柱的稳定性,能够满足安全生产要求。研究结果可为类似地质条件下内部存在断层的防隔水煤柱的应力转移保护提供参考依据。

关键词：定向爆破应力转移断层数值模拟防隔水煤柱正交试验

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