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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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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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从科尔沁草原到科尔沁沙地的思考

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应用生态学报 2024年第1期35卷 25-30页

作者：张铜会丛安琪连杰徐远志王宁中国科学院西北生态环境资源研究院奈曼沙漠化研究站兰州730000 中国科学院大学北京100049

本文首先从定义、空间范围以及土地退化演变等方面对科尔沁草原与科尔沁沙地进行了较为系统的阐述和分析对比,科尔沁草原是一个以蒙古族部落名称命名兼具地理单元特征的区域,但边界不清晰;科尔沁沙地是借用部落名称但具有独立地形地貌... 详细信息

本文首先从定义、空间范围以及土地退化演变等方面对科尔沁草原与科尔沁沙地进行了较为系统的阐述和分析对比,科尔沁草原是一个以蒙古族部落名称命名兼具地理单元特征的区域,但边界不清晰;科尔沁沙地是借用部落名称但具有独立地形地貌单元的区域,边界明确。科尔沁草原与科尔沁沙地既有交叉又有不同的两个空间区域。科尔沁草原区域大、范围广,而科尔沁沙地范围小但区域特色明显,已成为研究土地沙漠化发展与恢复的典型区域。以此为基础,回顾和总结了多年来科尔沁草原和科尔沁沙地相关的综合治理技术、模式以及取得的成效,整理归纳了今后沙地综合治理的焦点及亟待解决的问题,以期为当前科尔沁沙地歼灭战服务。

关键词：科尔沁草原科尔沁沙地沙质沙漠化土地利用类型沙地治理与恢复沙地歼灭战

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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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内蒙古库伦旗草地群落分布特征及牧草储量估算

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中国沙漠 2024年第1期44卷 142-150页

作者：徐远志刘新平胡鸿姣王立龙张铜会何玉惠中国科学院西北生态环境资源研究院奈曼沙漠化研究站甘肃兰州730000 中国科学院西北生态环境资源研究院皋兰生态与农业综合研究站甘肃兰州730000 中国科学院大学北京100049

充分认识草地群落分布特征、估算牧草储量是保护和合理利用草地资源的关键。以库伦旗8个乡镇的4个草地类型为研究对象,通过实地调查并结合空间分析法,探讨库伦旗草地群落的分布特征及其影响因素,并估算牧草储量。结果表明:库伦镇物种丰... 详细信息

充分认识草地群落分布特征、估算牧草储量是保护和合理利用草地资源的关键。以库伦旗8个乡镇的4个草地类型为研究对象,通过实地调查并结合空间分析法,探讨库伦旗草地群落的分布特征及其影响因素,并估算牧草储量。结果表明:库伦镇物种丰富度最高,水泉乡物种多样性指数最高;北部地区草地面积较大,牧草平均高度较大,但物种丰富度低于南部地区。根据物种重要值将群落类型分为23类。4个草地类型中,灌丛草地生物量最高,疏林草地多度最高。土壤因子显著影响植被高度、盖度、物种丰富度和多样性指数;优势物种狗尾草(Setaria viridis)和毛马唐(Digitaria chrysoblephara)主要分布在土壤肥力较差的灌丛草地和草甸草地。库伦旗草本类牧草的储量(干草)约为19.78万t,主要分布在北部的茫汗苏木和额勒顺镇。研究结果将为库伦旗牧草资源的开发利用、合理载畜量的评估和畜牧业的发展提供技术理论支撑。

关键词：库伦旗群落特征牧草储量草地类型

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Raising New Hope for Controlling Seizures in Focal Cortical Dysplasia with Gene Therapy

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Neuroscience Bulletin 2024年第7期40卷 1028-1030页

作者： yuanzhi Yang Yang Zheng Zhong Chen Cenglin xu Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province School of Pharmaceutical SciencesXinhua Hospital of Zhejiang ProvinceThe Second Affiliated Hospital of Zhejiang Chinese Medical UniversityZhejiang Chinese Medical UniversityHangzhou310053China

Focal cortical dysplasia(FCD)is characterized by abnormal cortical development and pharmacoresistant epilepsy,often accompanied by cognitive and behavioral malfunctions[1].According to the International League against Epilepsy(ILAE)classification proposed by Najm,Imad et *** 2022,FCD can be further divided into isolated forms(FCD type Ⅰ and Ⅱ)and another type associated with a principal lesion(FCD type Ⅲ)[2].

关键词： epilepsy al. Therapy

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Satellite glial cells in sensory ganglia play a wider role in chronic pain via multiple mechanisms

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Neural Regeneration Research 2024年第5期19卷 1056-1063页

作者： Xiaoyun Qiu yuanzhi Yang Xiaoli Da Yi Wang Zhong Chen Cenglin xu Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province School of Pharmaceutical ScienceZhejiang Chinese Medical UniversityHangzhouZhejiang ProvinceChina

Satellite glial cells are unique glial cells that surround the cell body of primary sensory *** increasing body of evidence suggests that in the presence of inflammation and nerve damage,a significant number of satellite glial cells become activated,thus triggering a series of functional *** suggests that satellite glial cells are closely related to the occurrence of chronic *** this review,we first summarize the morphological structure,molecular markers,and physiological functions of satellite glial ***,we clarify the multiple key roles of satellite glial cells in chronic pain,including gap junction hemichannel Cx43,membrane channel Pannexin1,K channel subunit 4.1,ATP,purinergic P2 receptors,and a series of additional factors and their receptors,including tumor necrosis factor,glutamate,endothelin,and ***,we propose that future research should focus on the specific sorting of satellite glial cells,and identify genomic differences between physiological and pathological *** review provides an important perspective for clarifying mechanisms underlying the peripheral regulation of chronic pain and will facilitate the formulation of new treatment plans for chronic pain.

关键词： chronic pain primary sensory neurons satellite glial cells sensory ganglia

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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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ESR SPECTRA STUDY OF COPPER(Ⅱ) COORDINATION COMPLEXES OF PYRIDI

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Science in China,Ser.B 1982年第5期25卷 453-460页

作者：徐元植俞琳华 Fujian Institute of Eesearch on the Structure of Matter Academia Sinica Fuzhou

The ESR spectra of powdered samples of Cu（Ⅱ） complexes with pyridine and its sixhomologues and pyrrol, aniline, as well as their solutions are measured at 77K in this *** electronic levels of these complexes are calculated from the ESR spectral *** is found that the non-pyridine ligands of complexes which can be substituted by pyridinemolecules of solvent in solution of pyridine/chloroform form Py4Cu2+. A molecular configura-tion is proposed. for Py4Cu2+ in solution. It is shown that the treatment with D2h symmetryinstead of D4h symmetry leads to a more satisfactory explanation of the ESR spectra.

关键词： ESR SPECTRA STUDY OF COPPER Cu COORDINATION COMPLEXES OF PYRIDI

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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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