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结构系统广义可靠性及数值仿真

铁道学报 2004年第3期26卷 36-40页

作者：李超王金诺西南交通大学机械工程学院

建立了结构系统广义可靠性分析模型。根据随机变量可能同时具有随机性和模糊性的特点,分别提出了模糊强度—随机应力、随机强度—模糊应力和模糊强度—模糊应力情况下的模糊可靠性分析方法。同时,建立了结构系统为独立单元部件串联或并... 详细信息

建立了结构系统广义可靠性分析模型。根据随机变量可能同时具有随机性和模糊性的特点,分别提出了模糊强度—随机应力、随机强度—模糊应力和模糊强度—模糊应力情况下的模糊可靠性分析方法。同时,建立了结构系统为独立单元部件串联或并联组成的模糊可靠性分析模型。考虑到不同模糊随机变量组合下的可靠性积分一般不存在解析解的情况,提出了用仿真法计算可靠度数值解,并阐述了数值仿真的基本原理和步骤。通过实例介绍了方法的具体运用。

关键词：结构系统模糊变量随机变量模糊可靠性数值仿真

A method for support stiffness failure identification in a steel spring floating slab track of urban railway: a case study in china

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Journal of Zhejiang university-Science A(applied Physics & Engineering) 2024年第3期25卷 206-222页

作者： Junyuan ZHENG Caiyou ZHAO Duojia SHI Ping wang Jian wang Bolong JIANG Xi SHENG Key Laboratoryof High-speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 60031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China 01 DYNA(Qingdao)Test&Data Co. Ltd.Qingdao 266000China Rail Transit Digital Construction and Measurement Technology National Engineering Research Center China Railway Design CorporationTianjin300308China institute of Urban Smart Transportation&Safety Maintenance Shenzhen UniversityShenzhen 518060China

The extensive use of steel spring floating slab tracks has effectively addressed the challenge of alleviating the environmental vibrations induced by urban rail transit ***,under the combined action of train dynamic loads and complex environmental factors,problems,such as the fracture of steel spring vibration isolators and suspension vibrations induced by the uneven settlement of the base,often *** failure of isolator support stiffness is often hidden in its early stages and is challenging to identify by conventional detection *** the same time,it will aggravate the wheel-rail interaction,accelerate the deterioration of track structure,and even affect the driving *** study first establishes a detailed coupled train-floating slab track-foundation analytical *** the influence of the vibration isolator support stiffness failure on the dynamic indices of the floating slab track system response is analyzed.A set of defect identification methods that can detect the number of failed steel springs,severity of damage,and their location is ***,an intelligent monitoring system for support stiffness of floating slab track is built by combining the density-based spatial clustering of applications with noise algorithm and statistical data analysis and is applied to a rail line in southern *** a three-year monitoring campaign,a suspension failure and a fracture of a steel spring were each successfully detected and detailed failure information was *** investigation results were consistent with the damage identification *** repair,the track structure dynamic response returned to the average pre-damage level and further deterioration had been *** proposed damage identification methods and monitoring system provide an approach for intelligent identification of track structure support stiffness failures.

关键词： Floating slab track Support stiffness Detailed analytical model Failure identification Monitoring system

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机车-轨道空间耦合动力学模型及其验证

铁道学报 2002年第4期24卷 21-27页

作者：王开云翟婉明蔡成标西南交通大学列车与线路研究所四川成都610031

基于车辆 -轨道耦合动力学理论 ,以六轴机车为例 ,建立了机车 -轨道空间耦合动力学模型 ,并编制了相应的计算机仿真软件。通过与实车线路试验结果进行比较 ,表明该模型及其仿真软件是正确可靠的 ,可以用于分析研究机车与轨道的动态相互... 详细信息

基于车辆 -轨道耦合动力学理论 ,以六轴机车为例 ,建立了机车 -轨道空间耦合动力学模型 ,并编制了相应的计算机仿真软件。通过与实车线路试验结果进行比较 ,表明该模型及其仿真软件是正确可靠的 ,可以用于分析研究机车与轨道的动态相互作用问题。

关键词：机车-轨道空间耦合动力学模型验证机车轨道仿真软件

铁路起重机伸缩臂可靠性分析的随机有限元方法研究

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铁道学报 2000年第5期22卷 17-20页

作者：靳慧张仲鹏王金诺王立彬西南交通大学机械工程研究所四川成都610031 石家庄铁道学院河北石家庄050043

结合板壳元 ,在载荷随机的情况下 ,给出了利用随机有限元计算大型、复杂结构可靠度的方法 ,推导了相应的计算公式 ,计算了 QTJS1

关键词：铁路起重机伸缩臂随机有限元可靠性板壳元

Inducing piezoelectricity in distorted rutile TiO_(2)for enhanced tetracycline hydrochloride degradation through photopiezocatalysis

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Journal of Advanced Ceramics 2024年第3期13卷 323-331页

作者： Taotao Xia Lizhen Lu Haoyu Zhang Jinghui wang Zonghe Huang Hongyang wang Weiyi Yang Shuang Gao Qi Li Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Various material design strategies have been developed to enhance photocatalytic performance of TiO_(2).However,no report is available on applications of the photopiezocatalysis strategy on TiO_(2)due to its lack of *** we developed a low-temperature molten salt etching process to create rutile TiO_(2)nanoparticles by etching[MgO_(6)]octahedrons away from MgTiO_(3)by molten NH_(4)Cl,during which a lattice distortion occurred in TiO_(2).The lattice distortion broke the structure symmetry of rutile TiO_(2)and subsequently endowed these rutile TiO_(2)nanoparticles with an unusual piezoelectric response with the maximum effective piezoelectric coefficient(d_(33))of~41.6 pm/V,which had not previously been found in TiO_(2)***,the photopiezocatalysis strategy was applied for the first time to enhance the photocatalytic performance of these TiO_(2)*** creation of lattice distortion to induce piezoelectricity could be extended to other photocatalysts that the photopiezocatalysis strategy has not been applied to and may generate novel functionalities for various technical applications.

关键词： photocatalysis TiO_(2) piezocatalysis molten salt etching process photopiezocatalysis

Dynamatic Simulation of ejection of metal under shock wave

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Dynamatic Simulation of ejection of metal under shock wave

18th International Conference on High Pressure Science and Technology

作者： Chen Jun Jing Fu-qian Zhang Jing-Lin Chen Dong-quan wang Ji-hai Laboratory for Shock Wave and Detonation Physics research southwest institute of FluidPhysics P.O.Box 919-111 Mianyang Sichuan 621900institute of applied Physics and Computational Mathematics Beijing 100088 institute of High Temperature and High Pressure Physics southwest jiaotong university chengdu Sichuan 610031.

＜正＞ This paper investigates ejection of metal surface groove under shock wave with molecular dynamics simulation. By using a hybrid tight-binding-like potential, the process of ejection was shown and the wave series propagating in material was classified. After ejection, there propagate one reflection rarefaction wave and one second uploading compression wave in material. And we also observe one negative pressure district and one high-pressure district induced by two wave series. When half-angle of groove is more than 60 degree, there is not ejection, and this is consistent with experiment. Meanwhile, we also study the dependence of the velocity of ejection atom and moving velocity of free surface on the initial shock wave and groove angle, and turn out that two velocities and the groove half-angle is in the direct ratio. In general, the molecular dynamics is good tools to study the interaction between the shock wave with surface, and the insight of ejection is reveal.

关键词： Metal Shock wave Ejection Groove free surface Wave series.

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某商用车怠速油底壳异响问题分析

应用声学 2024年第1期43卷 76-81页

作者：徐小翔李超曾小春王毅陈齐平江铃汽车股份有限公司产品研发总院南昌330001 江西省汽车噪声与振动重点实验室南昌330001 华东交通大学载运工具与装备教育部重点实验室南昌330013

针对产品开发过程中某柴油车型发动机油底壳怠速时“呜呜”异响问题,通过噪声与振动的测试及仿真分析,对油底壳异响原因进行分析。结果表明,怠速时机油泵的工作激励频率与油底壳模态频率耦合,形成“呜呜”声,并通过油底壳表面辐射出来... 详细信息

针对产品开发过程中某柴油车型发动机油底壳怠速时“呜呜”异响问题,通过噪声与振动的测试及仿真分析,对油底壳异响原因进行分析。结果表明,怠速时机油泵的工作激励频率与油底壳模态频率耦合,形成“呜呜”声,并通过油底壳表面辐射出来。进一步实验研究表明,随着机油温度的升高,机油泵功率、工作激励幅值会逐步减小,异响逐步减小。同时实验研究表明,机油量对油底壳模态频率有影响,油底壳内机油加注量越多,油底壳模态频率越低,油底壳表面振动幅值及异响均逐步减小。针对该异响问题,明确该发动机机油加注上限及下限时油底壳对应频率范围后,通过优化怠速转速,提高油底壳模态频率等使机油泵激励频率与油底壳模态频率避频,解决了该异响问题。

关键词：油底壳机油泵异响

Protein hydrogels for biomedical applications

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Biosurface and Biotribology 2024年第3期10卷 106-131页

作者： Xinyi wang Yue Hou Xiong Lu Chaoming Xie Yanan Jiang institute of Biomedical Engineering College of MedicineSouthwest Jiaotong UniversityChengduSichuanChina Key Lab of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuanChina Obesity and Metabolism Medicine-Engineering Integration Laboratory Department of General SurgeryThe Third People's Hospital of ChengduThe Affiliated Hospital of Southwest Jiaotong UniversityChengduSichuanChina

Hydrogels,characterised as highly hydrophilic three-dimensional polymer networks,have gained increasing attention due to their unique physicochemical properties,finding applications in various *** polymer hydrogels exhibit higher biocompatibility and biodegradability compared to traditional synthetic polymer ***,being the principal materials of natural polymer hydrogels,bear numerous modifiable functional *** resultant hydrogel possesses responsiveness,adjustable degradability,and underway as an excellent *** common raw materials used to construct protein hydrogels are *** terms of comparing natural polymer hydrogels with traditional synthetic polymer hydrogels,the authors conduct a detailed analysis and comparison,highlighting the advantages of natural polymer hydrogels in terms of biocompatibility and biodegradability,and summarising their *** authors also address the limitations of various protein hydrogels and list existing strengthening cross-linking strategies,proposing new insights to overcome the application limits of protein ***,the applications of protein hydrogels in drug delivery,biosensing,bio-inks and tissue engineering are *** authors conclude by summarising the current challenges faced by protein hydrogels and prospecting its future development.

关键词： biomaterials biomedical application

Portable Structure Surface Crack Detection System Based on Android Platform

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Wuhan university Journal of Natural Sciences 2024年第2期29卷 154-164页

作者： wang Huifeng PENG Haonan TANG Yu GUAN Yueyuan LIANG Yaru wang Lisha ZHAO Yu wang Xiaoyan GAO Rong HUANG He School of Electronics and Control Engineering Chang'an UniversityXi'an 710000ShaanxiChina Research institute of Highway Ministry of Transport Beijing 100000China State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610000SichuanChina Highway School Chang'an UniversityXi'an 710000ShaanxiChina

Cracks,potholes,and other defects often occur on infrastructure such as bridges,among which cracks are one of the most frequent *** have diverse shapes and are difficult to *** manual inspection methods are inefficient and have low accuracy,while automated inspection machines are bulky and inconvenient to carry and *** on the shortcomings of existing detection technologies,this paper proposes a portable structural surface crack detection system based on the Android platform using a portable hand-held image acquisition *** system captures cracks on the structure's surface and obtains high-definition crack ***,these images are transmitted to portable smartphone terminals through ***,the image is pre-processed using weighted averaging,grayscale linear transformation,and adaptive median ***,the improved Canny edge detection algorithm is applied to identify crack information,and the edge segmentation algorithm is used to determine the crack ***,based on camera calibration,the pixels are converted into the length data required for actual *** results show that the system is easy to operate,and it not only has crack storage and tracking functions,but also can effectively measure the crack width on the surface of *** measurement accuracy of this system reaches the sub-pixel level,and in actual testing,compared with the crack width gauge,the maximum relative error does notexceed6.25%.

关键词： structural crack portable image processing detection accuracy crack parameter