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Frequency-domain analysis of fluid-structure interaction in aircraft hydraulic pipeline systems: numerical and experimental studies

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第8期25卷 605-617页

作者： Yang DENG Zongxia JIAO yuanzhi xu School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Research Institute for Frontier Science Beihang UniversityBeijing 100191China Key Laboratory of Advanced Airborne Systems Beihang UniversityBeijing 100191China Ningbo Institute of Technology Beihang UniversityNingbo 315800China Tianmushan Laboratory Hangzhou 310023China

The fluid-structure interaction(FSI)in aircraft hydraulic pipeline systems is of great concern because of the damage it *** accurately predict the vibration characteristic of long hydraulic pipelines with curved segments,we studied the frequency-domain modeling and solution method for FSI in these pipeline *** partial differential equations(PDEs)are utilized to model the pipeline FSI,considering both frequency-dependent friction and bending-flexibility *** address the numerical instability encountered by the traditional transfer matrix method(TMM)in solving relatively complex pipelines,an improved TMM is proposed for solving the PDEs in the frequency domain,based on the matrix-stacking strategy and matrix representation of boundary *** proposed FSI model and improved solution method are validated by numerical cases and *** experimental rig of a practical hydraulic system,consisting of an aircraft engine-driven pump,a Z-shaped aero-hydraulic pipeline,and a throttle valve,was constructed for *** magnitude ratio of acceleration to pressure is introduced to evaluate the theoretical and experimental results,which indicate that the proposed model and solution method are effective in practical *** methodology presented in this paper can be used as an efficient approach for the vibrational design of aircraft hydraulic pipeline systems.

关键词： Fluid-structure interaction(FSI) Frequency-domain analysis Aircraft hydraulic pipeline Pipeline vibration Transfer matrix method(TMM)

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On fracture behavior of inner enamel:a numerical study

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Applied Mathematics and Mechanics(English Edition) 2023年第6期44卷 931-940页

作者： Siyong LIU yuanzhi xu Richeng LIAO Ge HE Li DING Bingbing AN Dongsheng ZHANG Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Department of Stomatology Shanghai Tenth People’s HospitalTongji University School of MedicineShanghai 200072China State-owned Changhong Machinery Factory Guilin 541002Guangxi Zhuang Autonomous RegionChina Shaoxing Institute of Technology Shaoxing 312074Zhejiang ProvinceChina

The ingenious hierarchical structure of enamel composed of rods and protein produces excellent fracture ***,the fracture resistance mechanism in the inner enamel is *** micromechanical models of enamel are constructed to numerically analyze the mechanical behaviors of the inner enamel with different decussation angles and different decussation *** results show that the manner of crack propagation in the inner enamel,including crack bridging,crack deflection,and crack bifurcation,is determined by both the rod decussation angle and the decussation *** the case of the strong decussation plane,the fracture strength and the required energy dissipation with the decussation angles of 15°and 30°are much higher than those without decussation,demonstrating that decussation is an important mechanism in improving the fracture resistance of *** maximum tensile stress of enamel with the decussation angle of 15°is slightly higher than that of enamel with the decussation angle of 30°,illustrating that an optimal decussation angle exists which balances the strength and *** synergetic mechanism of the decussation angle and the decussation plane on the crack propagation provides a new design hint for bionic composites.

关键词： finite element calculation rod decussation decussation plane crack

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Fanjingshan Mountain in Guizhou Province

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中国特色社会主义研究 2012年第S1期 129-129页

作者： xu yuanzhi

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Study on Spatial Variability of Soil Infiltration Coefficient in the Plain of the Yili River Valley in Xinjiang

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Meteorological and Environmental Research 2020年第2期11卷 82-86,89页

作者： Ying LI Yanli YIN Guizhang ZHAO yuanzhi xu Shiying ZHANG Xi'an Center of Geological Survey China Geological SurveyXi'an 710054China School of Water and Environment Chang'an UniversityXi'an 710054China Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education(Chang'an University) Xi'an 710054China North China University of Water Resources and Electric Power Zhengzhou 450045China

22 typical test points and 8 profiles were selected and arranged in the plain of Yili River Valley based on lithological distribution and sedimentary characteristics to study spatial variability of soil infiltration coefficient. The results show that the infiltration coefficient of different geo-morphic units is as follows: the desert area > the pre-mountain alluvial-proluvial plain > river terrace,which is mainly related to the lithology of aeration zone,buried depth of groundwater and underlying surface. For the infiltration coefficient of different aeration zone mediums,the results are consistent with the changing law. The partition of plain of the Yili River Valley is based on geo-morphic units,infiltration coefficient and the lithology of aeration zone. The maximum infiltration coefficient is concentrated in the desert area,and there is zonal distribution of infiltration coefficient in plane.

关键词： Plain of the Yili River Valley Lithology of aeration zone Infiltration coefficient Spatial variability

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A YAP/TAZ-CD54 axis is required for CXCR2-CD44-tumor-specific neutrophils to suppress gastric cancer

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Protein & Cell 2023年第7期14卷 515-533页

作者： Pingping Nie Weihong Zhang Yan Meng Moubin Lin Fenghua Guo Hui Zhang Zhenzhu Tong Meng Wang Fan Chen Liwei An Yang Tang Yi Han Ruixian Yu Wenjia Wang yuanzhi xu Linxin Wei Zhaocai Zhou Shi Jiao CAS Center for Excellence in Molecular Cell Science Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 200031China State Key Laboratory of Genetic Engineering School of Life SciencesZhongshan HospitalFudan UniversityShanghai 200438China Tongji University Cancer Center Department of Medical UltrasoundShanghai Tenth People's HospitalUltrasound Research and Education InstituteTongji University School of MedicineShanghai200072China Postdoctoral Station of Clinical Medicine Shanghai Tenth People's HospitalTongji University School of MedicineShanghai 200072China Tumor Immunology and Gene Therapy Center Shanghai Eastem Hepatobiliary Surgery HospitalShanghai 200438China Department of General Surgery Yangpu HospitalTongji University School of MedicineShanghai 200090China Department of General Surgery Hua'shan HospitalFudan University Shanghai Medical CollegeShanghai 200040China Department of Stomatology Shanghai Tenth People's HospitalTongji University School of MedicineShanghai 200072China Collaborative Innovation Center for Cancer Personalized Medicine School of Public HealthNanjing Medical UniversityNanjing 211166China

As an important part of tumor microenvironment,neutrophils are poorly understood due to their spatiotemporal heterogeneity in *** we defined,at single-cell resolution,CD44-CxCR2-neutrophils as tumor-specific neutrophils(tsNeus)in both mouse and human gastric cancer(GC).We uncovered a Hippo regulon in neutrophils with unique YAP signature genes(e.g.,ICAM1,CD14,EGR1)distinct from those identified in epithelial and/or cancer ***,knockout of YAP/TAz in neutrophils impaired their differentiation into CD54+tsNeus and reduced their antitumor activity,leading to accelerated GC ***,the relative amounts of CD54+tsNeus were found to be negatively associated with GC progression and positively associated with patient ***,GC patients receiving neoadjuvant chemotherapy had increased numbers of CD54+***,pharmacologically enhancing YAP activity selectively activated neutrophils to suppress refractory GC,with no significant inflammation-related side ***,our work characterized tumor-specific neutrophils in GC and revealed an essential role of YAP/TAZ-CD54 axis in tsNeus,opening a new possibility to develop neutrophil-based antitumor therapeutics.

关键词： neutrophils YAP TAZ gastriccancer

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CRYSTAL STRUCTURE OF TETRAMETHLAMMONIUM BIS(TETRATHIOCYANATOVANADYL) MONOHYDRATE

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结构化学 1984年第1期 61-64页

作者： Zhou Rangjing xu yuanzhi and Huang JinlingFujian Institute of Research on the Structure of Matter, Academia Sinica

Preliminary informatiom. The title compound [（CH3）4N]4[VO（NCS）4VO（NCS）4.H2O] is a member of a series of vanadyl complexes, currently being investigated. It was prepared by the reaction of VOSO4 with NH4SCN in aqueous solution. Crystal data. （from single, crystal diffractometry, MoKα, λ=0.71073） M=945.16, orthogonal, a=23.252（6）, b=13.015（2）, c=30.621（6）, space group Pcab, Z=8, Dm=1.32, Dc=1.34 ***-3

关键词：卜工 OO MONOHYDRATE TETRATHIOCYANATOVANADYL CRYSTAL STRUCTURE OF TETRAMETHLAMMONIUM BIS

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Chemical stability and antimicrobial activity of plasma sprayed CeO2-CS coating in Dental Implant

Chemical stability and antimicrobial activity of plasma spra...

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中华口腔医学会第九次全科口腔医学学术会议

作者： Wu jinjin Qi shengcai Wang raorao xu yuanzhi Shanghai Tenth People’s Hospital

Objective: Antimicrobial coatings could be a promising prevention of bacterial colonization on the dental implant surfaces. This study is to investigate the biological activity and antibacterial property of cerium Oxide incorporated calcium silicate coatings(CeO2-CS) in dental implant. Methods: In this study, CeO2 incorporated calcium silicate coatings(CeO2-CS) were prepared by plasma spraying technique with dimensions of ? 24 mm × 3 mm. The morphologies of the coatings were observed by scanning electron microscope(SEM). MC3T3-E1 cells cultured on the plastic, Ti–6Al–4V and CeO2-CS coating were served as blank, control and CeO2-CS groups. Cell counting Kit-8 method and Flow cytometry was used to test the biocompatibility function. The osteoblastic differentiation of the MC3T3-E1 cells ware tested by the quantitative RT-PCR analysis. The colony-forming unit and Cell ounting Kit-8 method was used to detect the antibacterial activity. Results: SEM and the chemical stability analysis showed that the CeO2 particles loaded on the surface of the coating, and the CeO2-CS coating has more stable biological activity. No cytotoxicity to MC3T3-E1 cells was observed on the CeO2-CS coating. ALP, OCN and BSP mRNA expression levels in MC3T3-E1 cells cultured on the CeO2-CS coating steadily increased compared to the other groups(P<0.05). The number of viable bacteria and the total colony forming unit(CFU) was significantly reduced on the CeO2-CS coating and the difference between each group was statistically significant(P<0.05). Conclusions: The cerium oxide incorporated calcium silicate coating could promote the adhesion and proliferation of osteoblasts. The CeO2-CS coating of titanium implants could inhibit the formation of bacterial biofilm for the antibacterial properties.

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[Co（2,3—tri）（amp）Cl]ZnCl4体系中三个几何经式异构体的识别

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化学学报 2001年第7期59卷 1106-1111页

作者：祝黔江陶朱徐元植贵州大学基础部浙江大学化学系贵州大学应用化学研究所浙江大学化学系

对[Co(2,3 -tri) (amp) Cl] ZnCl42, 3 - tri= N - (2 - aminoethyl) - 1,3 - propanediamine; amp ＝ 2 - (aminomethyl)pyridine)体系进行了合成,分离出四个配合物.用单晶X射线衍射分析了两个结构,用二维核磁共振DQCOSY和NOESY技术联合解析了另一结构.结构解析显示它们为该体系的四个几何经式异构体(meridian isomers).两个晶体结构都属中心对称的空间群,表明它们都是外消旋的对映体.

关键词： Co(Ⅲ)配合物钴几何经形式异构体单晶X衍射分析二维核磁共振技术结构

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基于气液耦合原理的飞机液压系统流体脉动消振器

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航空学报 2024年第15期45卷 50-64页

作者：徐远志王任源焦宗夏北京航空航天大学前沿科学技术创新研究院北京100191 北京航空航天大学自动化科学与电气工程学院北京100191 北京航空航天大学先进航空机载系统工业和信息化部重点实验室北京100191 北京航空航天大学宁波创新研究院宁波315800 天目山实验室杭州310023

飞机液压系统具有高可靠与高安全的需求,然而液压泵的输出流体脉动会导致管路振动,甚至元件损坏,是制约系统寿命和可靠性提升的瓶颈因素。机载液压系统对流体脉动抑制装置提出了宽频率范围、宽温度范围、高效减振、紧凑体积等要求,传统... 详细信息

飞机液压系统具有高可靠与高安全的需求,然而液压泵的输出流体脉动会导致管路振动,甚至元件损坏,是制约系统寿命和可靠性提升的瓶颈因素。机载液压系统对流体脉动抑制装置提出了宽频率范围、宽温度范围、高效减振、紧凑体积等要求,传统减振方式难以满足。从理论上给出了气液耦合消振数学原理,提出了一种宽频宽温的流体脉动消振器,用于飞机液压系统的脉动抑制应用。建立了该消振器的数学模型,研究了影响频率和温度范围的参数规律和设计准则,并讨论了安装位置的影响。研制了消振器样机,并针对航空液压泵开展了脉动抑制实验,验证了该消振器的宽频性能和宽温性能。实验结果表明,消振器在394.2~1540 Hz频率范围内有消振效果,且插入损失最大可达29.6 dB。常温下,压力脉动幅值时域上最大可降低75.7%,频域上最大可降低89.3%;高温下,压力脉动幅值时域上最大可降低68.0%,频域上最大可降低88.0%。提出的设计方法与消振器模型的有效性和准确性得到了实验验证,研制的消振器装置在宽频、宽温范围内具有良好的压力脉动衰减性能。

关键词：飞机液压系统压力脉动脉动抑制气液耦合脉动实验

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CRYSTAL STRUCTURE OF (μ-PYRAZINE)-BIS[DIAQUA(IMINODIACETATO) COPPBR(Ⅱ)] DIHYDRATE

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结构化学 1987年第1期 39-42页

作者： xu Duanjun Cheng Chaorong xu yuanzhi Zhou KangjingDepartment of Chemistry, Zhejiang UniversityFujian Institute of Research on the Structure of Hatter, Academia Sinica

PRELIMINARY INFORMATION. Recently multinuclear complexes with bridging ligand have been found possibly to possess special catalytical and special electric properties. Therefore more attention has been paid to such complexes. This study is a part of systimatic investigations on structures and properties of the kind of complexes, which have been carred out previously.

关键词： IMINODIACETATO PYRAZINE COPPBR CRYSTAL STRUCTURE OF DIHYDRATE BIS[DIAQUA

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