期刊文献+
共找到2,637篇文章
< 1 2 132 >
每页显示 20 50 100
移动应用GUI测试自动生成技术综述
1
作者 王博 陈冲 +3 位作者 邓明 董震 林友芳 郝丹 《软件学报》 北大核心 2025年第6期2713-2746,共34页
移动应用是近10年来兴起的新型计算模式,深刻地影响人民的生活方式.移动应用主要以图形用户界面(graphical user interface,GUI)方式交互,而对其进行人工测试需要消耗大量人力和物力.为此,研究者提出针对移动应用GUI的测试自动生成技术... 移动应用是近10年来兴起的新型计算模式,深刻地影响人民的生活方式.移动应用主要以图形用户界面(graphical user interface,GUI)方式交互,而对其进行人工测试需要消耗大量人力和物力.为此,研究者提出针对移动应用GUI的测试自动生成技术以提升测试效率并检测潜在缺陷.收集了145篇相关论文,系统地梳理、分析和总结现有工作.提出了“测试生成器-测试环境”研究框架,将该领域的研究按照所属模块进行分类.特别地,依据测试生成器所基于的方法,将现有方法大致分为基于随机、基于启发式搜索、基于模型、基于机器学习和基于测试迁移这5个类别.此外,还从缺陷类别和测试动作等其他分类维度梳理现有方法.收集了该领域中较有影响力的数据集和开源工具.最后,总结当前面临的挑战并展望未来的研究方向. 展开更多
关键词 软件测试 gui测试 测试生成 移动应用测试 安卓应用
在线阅读 下载PDF
基于MATLAB GUI的布齿参数优化与应用
2
作者 任钞 康向涛 +1 位作者 曹萍 王春华 《矿业安全与环保》 北大核心 2025年第5期177-185,共9页
PDC钻头在煤矿钻孔作业中以卓越的破岩性能、高效的钻孔效率备受关注。为研究PDC齿切削参数与受力的关系,设计并开展了PDC单齿切削试验,并进行切削齿受力计算模型与仿真模拟验证。基于MATLAB GUI与全局力平衡理论,开发了专用的布齿参数... PDC钻头在煤矿钻孔作业中以卓越的破岩性能、高效的钻孔效率备受关注。为研究PDC齿切削参数与受力的关系,设计并开展了PDC单齿切削试验,并进行切削齿受力计算模型与仿真模拟验证。基于MATLAB GUI与全局力平衡理论,开发了专用的布齿参数优化软件,对现场使用的五翼平底型钻头的周向角θ、后倾角α和侧转角β进行多目标优化。结果表明:在直线切削正交试验与仿真模拟中,切削深度、后倾角和切削速度对切削齿受力影响由大到小依次均为切削深度、后倾角、切削速度。参数优化软件的应用,成功地减小了钻头的侧向力与弯曲力矩,侧向力与钻压之比的计算值下降到1/1000,弯曲力矩与转矩之比的计算值下降到1/100;通过Abaqus数值模拟验证了参数优化取得了一定的效果,侧向力与转压的比值和弯曲力矩与转矩的比值均能够降低到较低水平。其中,侧向力平均值降低了1.81 kN,弯曲力矩平均值减小了0.163 kN·m,数据的离散性明显降低。更小的侧向力与弯曲力矩能够提高钻头的钻进效率,与此同时软件的计算复杂度受钻头布齿参数的影响相对较小。因此,参数优化软件可以应用于钻头的布齿参数优化设计,提高钻头设计效率。 展开更多
关键词 PDC钻头 正交试验 参数优化 MATLAB gui 数值模拟
在线阅读 下载PDF
Interface Shear Behavior Between Bio-Inspired Sidewall of a Scaled Suction Caisson and Sand Under Pull-out Load
3
作者 LI Da-yong LIANG Hao +1 位作者 ZHAO Ji-peng ZHANG Yu-kun 《China Ocean Engineering》 2025年第4期708-717,共10页
The scaled suction caisson repre sents an innovative design featuring a bio-inspired sidewall modeled after snake skin,commonly utilized in offshore mooring platforms.In comparison with traditional suction caissons,th... The scaled suction caisson repre sents an innovative design featuring a bio-inspired sidewall modeled after snake skin,commonly utilized in offshore mooring platforms.In comparison with traditional suction caissons,this bio-inspired design demonstrates reduced penetration resistance and enhanced pull-out capacity due to the anisotropic shear behaviors of its sidewall.To investigate the shear behavior of the bio-inspired sidewall under pull-out load,direct shear tests were conducted between the bio-inspired surface and sand.The research demonstrates that the interface shear strength of the bio-inspired surface significantly surpasses that of the smooth surface due to interlocking effects.Additionally,the interface shear strength correlates with the aspect ratio of the bio-inspired surface,shear angle,and particle diameter distribution,with values increasing as the uniformity coefficient Cudecreases,while initially increasing and subsequently decreasing with increases in both aspect ratio and shear angle.The ratio between the interface friction angleδand internal friction angle δ_(s) defines the interface effect factor k.For the bio-inspired surface,the interface effect factor k varies with shear angleβ,ranging from 0.9 to 1.12.The peak value occurs at a shear angleβof 60°,substantially exceeding that of the smooth surface.A method for calculating the relative roughness R_(N) is employed to evaluate the interface roughness of the bio-inspired surface,taking into account scale dimension and particle diameter distribution effects. 展开更多
关键词 scaled suction caisson interface shear test shear strength interface friction angle bio-inspired surface pull-out load
在线阅读 下载PDF
Repetitive interface frictional anisotropy mobilized by sand and snakeskin-inspired surfaces
4
作者 Muhammad Naqeeb Nawaz Tae-Young Kim Song-Hun Chong 《Journal of Rock Mechanics and Geotechnical Engineering》 2025年第10期6691-6703,共13页
Understanding frictional anisotropy,which refers to the variation in frictional resistance based on the shear direction,is crucial for optimizing the friction angle between a bio-inspired structure and the surrounding... Understanding frictional anisotropy,which refers to the variation in frictional resistance based on the shear direction,is crucial for optimizing the friction angle between a bio-inspired structure and the surrounding soil.Previous studies focused on estimating the interface frictional anisotropy mobilized by snakeskin-inspired textured surfaces and sand under monotonic shear loading conditions.However,there is a need to estimate interface frictional anisotropy under repetitive shear loads.In this study,a series of repetitive direct shear(DS)tests are performed with snakeskin-inspired textured surfaces under a constant vertical stress and two shear directions(cranial first half→caudal second half or caudal first half→cranial second half).The results show that(1)mobilized shear stress increases with the number of shearing cycles,(2)cranial shearing(shearing against the scales)consistently produces a higher shear resistance and less contractive behavior than caudal shearing(shearing along the scales),and(3)a higher scale height or smaller scale length of the surface yields a higher interface friction angle across all shearing cycles.Further analysis reveals that the gap between the cranial and caudal shear zones of the interface friction angle as a function of L/H(i.e.the ratio of scale length L to scale height H)continues to decrease as the number of shearing cycles approaches asymptotic values.The directional frictional resistance(DFR)decreases as the number of shearing cycles increases.Furthermore,the discussion covers the impact of initial relative density,vertical stress,and the number of shearing cycles on interface frictional anisotropy. 展开更多
关键词 Snakeskin-inspired textured surfaces Modified interface direct shear(DS)tests interface friction angle Directional frictional resistance(DFR) Cranial shearing Caudal shearing
在线阅读 下载PDF
Failure characterization of fully grouted rock bolts under triaxial testing 被引量:2
5
作者 Hadi Nourizadeh Ali Mirzaghorbanali +3 位作者 Mehdi Serati Elamin Mutaz Kevin McDougall Naj Aziz 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第3期778-789,共12页
Confining stresses serve as a pivotal determinant in shaping the behavior of grouted rock bolts.Nonetheless,prior investigations have oversimplified the three-dimensional stress state,primarily assuming hydrostatic st... Confining stresses serve as a pivotal determinant in shaping the behavior of grouted rock bolts.Nonetheless,prior investigations have oversimplified the three-dimensional stress state,primarily assuming hydrostatic stress conditions.Under these conditions,it is assumed that the intermediate principal stress(σ_(2))equals the minimum principal stress(σ_(3)).This assumption overlooks the potential variations in magnitudes of in situ stress conditions along all three directions near an underground opening where a rock bolt is installed.In this study,a series of push tests was meticulously conducted under triaxial conditions.These tests involved applying non-uniform confining stresses(σ_(2)≠σ_(3))to cubic specimens,aiming to unveil the previously overlooked influence of intermediate principal stresses on the strength properties of rock bolts.The results show that as the confining stresses increase from zero to higher levels,the pre-failure behavior changes from linear to nonlinear forms,resulting in an increase in initial stiffness from 2.08 kN/mm to 32.51 kN/mm.The load-displacement curves further illuminate distinct post-failure behavior at elevated levels of confining stresses,characterized by enhanced stiffness.Notably,the peak load capacity ranged from 27.9 kN to 46.5 kN as confining stresses advanced from σ_(2)=σ_(3)=0 to σ_(2)=20 MPa and σ_(3)=10 MPa.Additionally,the outcomes highlight an influence of confining stress on the lateral deformation of samples.Lower levels of confinement prompt overall dilation in lateral deformation,while higher confinements maintain a state of shrinkage.Furthermore,diverse failure modes have been identified,intricately tied to the arrangement of confining stresses.Lower confinements tend to induce a splitting mode of failure,whereas higher loads bring about a shift towards a pure interfacial shear-off and shear-crushed failure mechanism. 展开更多
关键词 Rock bolts Bolt-grout interface Bond strength Push test Triaxial tests
在线阅读 下载PDF
Theoretical investigation on axial cyclic performance of monopile in sands using interface constitutive models 被引量:1
6
作者 Pan Zhou Jingpei Li +2 位作者 Kaoshan Dai Stefan Vogt Seyedmohsen Miraei 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第7期2645-2662,共18页
Cyclic loads generated by environmental factors,such as winds,waves,and trains,will likely lead to performance degradation in pile foundations,resulting in issues like permanent displacement accumulation and bearing c... Cyclic loads generated by environmental factors,such as winds,waves,and trains,will likely lead to performance degradation in pile foundations,resulting in issues like permanent displacement accumulation and bearing capacity attenuation.This paper presents a semi-analytical solution for predicting the axial cyclic behavior of piles in sands.The solution relies on two enhanced nonlinear load-transfer models considering stress-strain hysteresis and cyclic degradation in the pile-soil interaction.Model parameters are calibrated through cyclic shear tests of the sand-steel interface and laboratory geotechnical testing of sands.A novel aspect involves the meticulous formulation of the shaft loadtransfer function using an interface constitutive model,which inherently inherits the interface model’s advantages,such as capturing hysteresis,hardening,degradation,and particle breakage.The semi-analytical solution is computed numerically using the matrix displacement method,and the calculated values are validated through model tests performed on non-displacement and displacement piles in sands.The results demonstrate that the predicted values show excellent agreement with the measured values for both the static and cyclic responses of piles in sands.The displacement pile response,including factors such as bearing capacity,mobilized shaft resistance,and convergence rate of permanent settlement,exhibit improvements compared to non-displacement piles attributed to the soil squeezing effect.This methodology presents an innovative analytical framework,allowing for integrating cyclic interface models into the theoretical investigation of pile responses. 展开更多
关键词 PILES Cyclic degradation Load-transfer models interface constitutive model Semi-analytical solution Model tests
在线阅读 下载PDF
Study on Shear Strength Characteristics of Basalt-Concrete Bonding Interface Based on in-situ Direct Shear Test 被引量:1
7
作者 Peng Xia Xinli Hu +5 位作者 Chunye Ying Shuangshuang Wu Chu Xu Xuan Wang Hao Chen Hang Duan 《Journal of Earth Science》 SCIE CAS CSCD 2024年第2期553-567,共15页
In rock engineering,the shear strength of the basalt-concrete bonding interface is a key factor affecting the shear performance of hydroelectric dam foundations,embedded rock piles and rock bolts.In this study,30 sets... In rock engineering,the shear strength of the basalt-concrete bonding interface is a key factor affecting the shear performance of hydroelectric dam foundations,embedded rock piles and rock bolts.In this study,30 sets of in-situ direct shear tests were conducted on the basalt-concrete bond interface in the Baihetan dam area to investigate the shear strength characteristics of the basalt-concrete bonding interface.The bonding interface contains two states,i.e.,the bonding interface is not sheared,termed as se(symbolic meaning see Table 1);the bonding interface is sheared with rupture surface,termed as si.The effects of lithology,Joints structure,rock type grade and concrete compressive strength on the shear strength of the concrete-basalt contact surface were investigated.The test results show that the shear strength of the bonding interface(s_(e)&s_(i))of columnar jointed basalt with concrete is greater than that of the bonding interface(s_(e)&s_(i))of non-columnar jointed one with the same rock type grade.When the rock type grade isⅢ_(2),fcol is 1.22 times higher than fncol and ccol is 1.13 times greater than cncol.The shear strength parameters of the basalt-concrete bonding interface differ significantly for different lithologies.The cohesion of the bonding interface(s_(i))of cryptocrystalline basalt with concrete is 2.05 times higher than that of the bonding interface(s_(i))of breccia lava with concrete under the same rock type grade condition.Rock type grade has a large influence on the shear strength of the non-columnar jointed basalt-concrete bonding interface(s_(e)&s_(i)).cnol increases by 33%when the grade of rock type rises fromⅢ_(1)toⅡ_(1).the rock type grade has a greater effect on bonding interface(s_(i))cohesion than the coefficient of friction.When the rock type grade is reduced fromⅢ_(2)toⅢ_(1),f_(ncol)′increases by 2%and c_(ncol)′improves by 44%.The shear strength of the non-columnar jointed basalt-concrete bonding interface(s_(e)&s_(i))increases with the increase of the compressive strength of concrete.When concrete compressive strength rises from 22.2 to 27.6 MPa,the cohesion increases by 94%. 展开更多
关键词 direct shear test basalt-concrete bonding interface shear strength parameters engineering geogolgy
原文传递
A graphical user interface(GUI)for model-based radiation-induced acoustic computed tomography
8
作者 Michelle Simon Prabodh Kumar Pandey +1 位作者 Leshan Sun Liangzhong Xiang 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS CSCD 2023年第1期39-53,共15页
Radiation-induced acoustic computed tomography(RACT)is an evolving biomedical imaging modality that aims to reconstruct the radiation energy deposition in tissues.Traditional backprojection(BP)reconstructions carry no... Radiation-induced acoustic computed tomography(RACT)is an evolving biomedical imaging modality that aims to reconstruct the radiation energy deposition in tissues.Traditional backprojection(BP)reconstructions carry noisy and limited-view artifacts.Model-based algorithms have been demonstrated to overcome the drawbacks of BPs.However,model-based algorithms are relatively more complex to develop and computationally demanding.Furthermore,while a plethora of novel algorithms has been developed over the past decade,most of these algorithms are either not accessible,readily available,or hard to implement for researchers who are not well versed in programming.We developed a user-friendly MATLAB-based graphical user interface(GUI;RACT2D)that facilitates back-projection and model-based image reconstructions for twodimensional RACT problems.We included numerical and experimental X-ray-induced acoustic datasets to demonstrate the capabilities of the GUI.The developed algorithms support parallel computing for evaluating reconstructions using the cores of the computer,thus further accelerating the reconstruction speed.We also share the MATLAB-based codes for evaluating RACT reconstructions,which users with MATLAB programming expertise can further modify to suit their needs.The shared GUI and codes can be of interest to researchers across the globe and assist them in e±cient evaluation of improved RACT reconstructions. 展开更多
关键词 Radiation-induced acoustic computed tomography(RACT) image reconstruction graphical user interface(gui) photoacoustic tomography
原文传递
基于元素树模型的GUI软件自动化测试用例生成 被引量:2
9
作者 张怀康 姜林 +1 位作者 黄春营 刘远 《软件》 2024年第8期88-91,共4页
随着计算机技术飞速发展,软件行业展现出蓬勃的生机与活力,软件测试作为软件开发流程中不可或缺的一环,是软件质量保证的关键。但GUI软件的结构日益复杂,其手工测试也受限于人力资源、测试效率、测试成本等因素。因此,本文针对GUI软件... 随着计算机技术飞速发展,软件行业展现出蓬勃的生机与活力,软件测试作为软件开发流程中不可或缺的一环,是软件质量保证的关键。但GUI软件的结构日益复杂,其手工测试也受限于人力资源、测试效率、测试成本等因素。因此,本文针对GUI软件自动化测试需求,对控件元素进行分类,提出一种元素树模型,用于测试用例生成,以实现自动化测试。通过实例证明该元素树模型可以增加自动化测试用例推荐的准确性,有效地节约测试成本和时间,为GUI软件自动化测试用例生成提供了可行的方法。 展开更多
关键词 元素树模型 gui 测试用例 自动化测试
在线阅读 下载PDF
Strategy and Methodology of Integration Testing for GUI Software
10
作者 Mengqing TanLi Jiyi Xiao Ying Zhang 《Journal of Software Engineering and Applications》 2023年第8期361-396,共36页
In this paper, by means of effective testing practices, main strategies of integration testing for GUI software, including differentiating strategy for distinguished system, strategy of personnel organization, increme... In this paper, by means of effective testing practices, main strategies of integration testing for GUI software, including differentiating strategy for distinguished system, strategy of personnel organization, incremental testing strategy based on baseline version, testing strategy of circulating loop through the whole life, and the strategy of test suite construction, were briefly investigated. Moreover, for the code analysis, the FTA (Fault Tree analysis) is proposed to deal with the software change in regression testing. For test suite constructing, the constructing methods for baseline version and the incremental change are deeply discussed, in which main points focus on the testing strategy based on “Sheet/Form”, the “Grey-box approach” for integration testing process, and the application of the improved STD (State Transform Diagram) in state testing. At the same time, the suite construction of integration testing for two types, including small scale program and large scale software, is analyzed and discussed in detail. For testing execution, the specific method based on “Cross-testing” is investigated. Concurrently, by a lot of examples, all results of testing activity indicate that these strategies and methods are useful and fitted to integration testing for GUI software. 展开更多
关键词 Integration testing Strategy and Methodology Grey-Box Approach gui Software
在线阅读 下载PDF
图形用户界面(GUI)外观设计专利保护问题研究 被引量:1
11
作者 张璇 《河南科技》 2024年第2期132-135,共4页
【目的】通过对GUI外观设计专利侵权案件的对比分析,找出GUI外观设计专利制度存在的不足,并提出相关完善建议。【方法】通过分析相关案件,梳理司法审判中GUI外观设计专利侵权的侵权判定规则。【结果】由于GUI外观设计的特殊性,可以通过... 【目的】通过对GUI外观设计专利侵权案件的对比分析,找出GUI外观设计专利制度存在的不足,并提出相关完善建议。【方法】通过分析相关案件,梳理司法审判中GUI外观设计专利侵权的侵权判定规则。【结果】由于GUI外观设计的特殊性,可以通过细化侵权判断的主体、简化“产品”对GUI外观设计的限制、引入间接侵权规则等方式扩大对GUI外观设计专利的保护。【结论】随着科技发展,GUI外观设计未来会有更多形式呈现,因此需要在立法及司法中对GUI外观设计保护加以完善。 展开更多
关键词 图形用户界面 gui 外观设计 侵权判定
在线阅读 下载PDF
Data Quality Control Method of a New Drifting Observation Technology Named Drifting Air-Sea Interface Buoy
12
作者 LI Shuo WANG Bin +3 位作者 DENG Zeng’an WU Baoqin ZHU Xiande CHEN Zhaohui 《Journal of Ocean University of China》 CAS CSCD 2024年第1期11-22,共12页
An integral quality control(QC)procedure that integrates various QC methods and considers the design indexes and operational status of the instruments for the observations of drifting air-sea interface buoy was develo... An integral quality control(QC)procedure that integrates various QC methods and considers the design indexes and operational status of the instruments for the observations of drifting air-sea interface buoy was developed in the order of basic in-spection followed by targeted QC.The innovative method of combining a moving Hampel filter and local anomaly detection com-plies with statistical laws and physical processes,which guarantees the QC performance of meteorological variables.Two sets of observation data were used to verify the applicability and effectiveness of the QC procedure,and the effect was evaluated using the observations of the Kuroshio Extension Observatory buoy as the reference.The results showed that the outliers in the time series can be correctly identified and processed,and the quality of data improved significantly.The linear correlation between the quality-controlled observations and the reference increased,and the difference decreased.The correlation coefficient of wind speed before and after QC increased from 0.77 to 0.82,and the maximum absolute error decreased by approximately 2.8ms^(-1).In addition,air pressure and relative humidity were optimized by 10^(-3)–10^(-2) orders of magnitude.For the sea surface temperature,the weight of coefficients of the continuity test algorithm was optimized based on the sea area of data acquisition,which effectively expanded the applicability of the algorithm. 展开更多
关键词 drifting air-sea interface buoy quality control oceanic variables meteorological variables continuity test
在线阅读 下载PDF
盐渍冻土-混凝土接触面剪切特性试验研究 被引量:1
13
作者 万旭升 周浩 +3 位作者 路建国 晏忠瑞 刘凤云 杨乾承 《工程地质学报》 北大核心 2025年第4期1553-1565,共13页
盐渍冻土与混凝土接触界面的力学特性对寒旱区道路工程结构的稳定性和耐久性有重要的影响。为了揭示多因素作用下盐渍冻土-混凝土接触面力学特性,通过室内试验和数学模型探究了接触面剪切应力-位移关系和剪切强度变化规律。开展了补水... 盐渍冻土与混凝土接触界面的力学特性对寒旱区道路工程结构的稳定性和耐久性有重要的影响。为了揭示多因素作用下盐渍冻土-混凝土接触面力学特性,通过室内试验和数学模型探究了接触面剪切应力-位移关系和剪切强度变化规律。开展了补水和不补水、冻融循环方式(单向和整体冻融循环)、冻融循环次数(0次、5次、10次、20次)、含盐量(0、0.5%、1%、2%、3%、4%)、含盐类型(NaCl和Na_(2)SO_(4))、剪切温度(-2℃、-5℃、-10℃)等条件下的盐渍冻土-混凝土接触面直剪试验。基于龚帕兹模型拟合了接触面的剪应力-剪切位移关系。并运用灰色相关理论分析了各影响因素与接触面剪切强度关联性。研究结果表明:冻融循环方式对接触面抗剪强度的影响差异不明显,但随着冻融循环次数增加,接触面抗剪强度均逐渐降低。接触面抗剪强度随着盐含量的增加而降低,当含盐量超过2%时,硫酸钠和氯化钠冻土接触面抗剪强度呈现相反变化规律,其中硫酸钠冻土接触面强度增大。当温度降至-5℃及更低温度后,补水条件对接触面抗剪强度起增强作用。龚帕兹模型与盐渍冻土-混凝土接触面的应力位移关系吻合较好,可用于评价寒旱盐渍土区土-混凝土接触面剪切特性。由灰色关联分析得出各影响因素的显著性排序为:含水率>剪切温度>冻融循环次数>氯化钠含盐量>硫酸钠含盐量。 展开更多
关键词 道路工程 盐渍土 直剪试验 接触面 冻融循环
在线阅读 下载PDF
面向GUI界面的轻量级文本识别算法
14
作者 马荧炜 《现代信息科技》 2024年第14期94-97,共4页
图形用户界面成为用户与软件进行交互的必要方式之一。然而,随着软件规模和复杂性的增长,测试代价愈加高昂。基于OCR算法的文本控件识别方法引起了越来越多的关注,例如Sikuli通过OCR技术匹配窗口控件的文本,从屏幕上基于图像匹配来定位... 图形用户界面成为用户与软件进行交互的必要方式之一。然而,随着软件规模和复杂性的增长,测试代价愈加高昂。基于OCR算法的文本控件识别方法引起了越来越多的关注,例如Sikuli通过OCR技术匹配窗口控件的文本,从屏幕上基于图像匹配来定位窗口控件。目前OCR引擎应用广泛,但是OCR算法通常运行缓慢,它们可能需要几秒钟的时间来识别GUI屏幕上的文本。文章介绍了一种快速的轻量级文本识别算法以加速OCR的文本识别过程。实验表明,在RICO数据集上,该算法降低了基于OCR的文本识别84%的平均时间。 展开更多
关键词 gui测试 OCR 计算机视觉
在线阅读 下载PDF
土工格栅与砾性土界面特性的拉拔试验研究
15
作者 王家全 林鸿 +1 位作者 韦林邑 唐毅 《岩土工程学报》 北大核心 2025年第8期1711-1720,共10页
路基工程中,长期受到上部荷载作用的加筋砾性土填料易发生细粒侵入现象,造成筋土界面力学特性劣化。基于拉拔速率、相对密实度、法向应力等因素,对土工格栅与不同细粒含量的含高塑性细粒砾性土进行拉拔试验,探讨了多因素耦合对筋土界面... 路基工程中,长期受到上部荷载作用的加筋砾性土填料易发生细粒侵入现象,造成筋土界面力学特性劣化。基于拉拔速率、相对密实度、法向应力等因素,对土工格栅与不同细粒含量的含高塑性细粒砾性土进行拉拔试验,探讨了多因素耦合对筋土界面强度特性与体变特性的影响规律。研究结果表明:在不同拉拔速率下,细粒含量增加会导致拉拔阻力曲线由硬化变为软化,界面剪缩性逐渐增强。中密实度时,细粒含量0%的拉拔阻力曲线由于颗粒分布不均匀出现阶梯式下降。剪缩性在低密实度、高细粒含量时显著。法向应力相同时,细粒含量提高会导致峰值拉拔阻力和位移减少,制约剪胀性。综合摩擦因数比K与法向应力σv、细粒含量Fc呈幂函数关系。细粒含量10%为砾性土界限细粒含量,该细粒含量下的土工格栅与砾性土的拉拔界面强度与变形特性发生过渡变化,体变从剪胀向剪缩转化,界面强度逐渐降低。 展开更多
关键词 路基工程 细粒含量 拉拔试验 界面特性
原文传递
地铁曲线不同位置轮轨界面综合摩擦因数优化
16
作者 朱爱华 张财胜 +3 位作者 张帆 杨建伟 白堂博 张骄 《铁道建筑》 北大核心 2025年第5期49-56,共8页
针对地铁小半径曲线轮轨精准润滑技术,考虑不同轨顶与轨侧摩擦因数匹配工况,对地铁曲线不同位置的轮轨界面综合摩擦因数进行优化。在SIMPACK中建立地铁车辆动力学模型,引入轮轨界面综合摩擦因数管理模型,分析曲线不同位置轨顶与轨侧摩... 针对地铁小半径曲线轮轨精准润滑技术,考虑不同轨顶与轨侧摩擦因数匹配工况,对地铁曲线不同位置的轮轨界面综合摩擦因数进行优化。在SIMPACK中建立地铁车辆动力学模型,引入轮轨界面综合摩擦因数管理模型,分析曲线不同位置轨顶与轨侧摩擦因数匹配工况对轮轨磨耗性能、轮对冲角、表面疲劳指数和脱轨系数的影响规律。使用熵权TOPSIS法对4个评价指标建立多目标优化模型,实现曲线不同位置的轮轨界面综合摩擦因数优化。结果表明:缓中点Ⅰ、缓圆点和曲中点的综合性能同时受轨顶和轨侧摩擦因数的影响,圆缓点的综合性能主要受轨侧摩擦因数的影响,缓中点Ⅱ的综合性能主要受轨顶摩擦因数的影响;缓中点Ⅰ、缓圆点、曲中点、圆缓点和缓中点Ⅱ的最佳摩擦因数组合(轨顶摩擦因数/轨侧摩擦因数)分别为0.20/0.35、0.20/0.10、0.25/0.10、0.20/0.20和0.20/0.30。 展开更多
关键词 地铁 综合摩擦因数 模型试验 轮轨界面 优化 轨顶 轨侧
在线阅读 下载PDF
砂土-钢板界面剪切试验与PFC细观模拟分析
17
作者 李永辉 王海 +1 位作者 牛恒宇 蒋晓天 《长江科学院院报》 北大核心 2025年第2期107-114,137,共9页
针对砂土-钢板接触界面,通过大型界面剪切试验和PFC细观模拟,探究法向应力和界面粗糙度对砂土-钢板接触界面剪切力学特性的影响及内在机理。结果表明:界面粗糙度增大,界面摩擦角随之增大,界面剪切强度、残余强度提高,砂土剪缩、剪胀性显... 针对砂土-钢板接触界面,通过大型界面剪切试验和PFC细观模拟,探究法向应力和界面粗糙度对砂土-钢板接触界面剪切力学特性的影响及内在机理。结果表明:界面粗糙度增大,界面摩擦角随之增大,界面剪切强度、残余强度提高,砂土剪缩、剪胀性显著;法向应力增大,界面剪切强度、残余强度提高,砂土剪缩性提升,剪胀性降低;界面剪切过程中砂土颗粒向剪切方向移动聚集,强接触力链合并,数量减少,传力性能提升;界面粗糙度通过改变钢板槽内砂土颗粒的数量使其与钢板的接触面积发生变化,从而对界面剪切力学特性产生影响;法向应力影响砂土与钢板接触的密实度和作用力,使得其界面剪切力学性状产生变化。 展开更多
关键词 砂土-钢板接触界面 界面剪切试验 PFC 细观模拟 界面粗糙度 法向应力
在线阅读 下载PDF
不同横肋间距的土工格栅界面特性宏细观研究
18
作者 靳静 温馨 +3 位作者 梁小勇 王迪 杨广庆 周诗广 《铁道科学与工程学报》 北大核心 2025年第4期1602-1613,共12页
土工格栅与土之间界面特性是影响加筋土结构稳定的关键因素。为研究不同横肋间距土工格栅的界面摩擦特性,对3种横肋间距(28、35、50 cm)土工格栅进行室内宏观拉拔试验和离散元细观模拟,宏观层面分析不同横肋间距下拉拔力与拉拔位移的关... 土工格栅与土之间界面特性是影响加筋土结构稳定的关键因素。为研究不同横肋间距土工格栅的界面摩擦特性,对3种横肋间距(28、35、50 cm)土工格栅进行室内宏观拉拔试验和离散元细观模拟,宏观层面分析不同横肋间距下拉拔力与拉拔位移的关系、界面摩擦特性的变化规律,细观层面上研究颗粒配位数、孔隙率、位移场,以及拉拔过程中土体内部力链的变化规律。研究结果表明:拉拔力-拉拔位移关系曲线呈非线性,随着横肋间距的减小,峰值拉拔力不断增大。在法向应力为200 kPa作用下,横肋间距由50 cm减至28 cm时,峰值拉拔力提高70%,28 cm横肋间距的土工格栅抗剪强度较强。筋土界面的黏聚力和摩擦角也随横肋间距的减小而增大。在细观层面,较小横肋间距的土工格栅砂土密实性更好,土体内部颗粒分布更均匀。同时,随着拉拔位移的增加,筋土界面配位数随之减小,使得土体发生一定的剪胀现象。随着横肋间距的减小,土体整体孔隙率下降,密实性明显提高,土工格栅对土体嵌固作用增强。在拉拔过程中土工格栅横肋附近的颗粒旋转,横肋间距较大时,土体内部难以形成贯通的剪切带。较小横肋间距的土工格栅在横肋节点附近力链分布更强。研究结果可为土工格栅加筋土结构设计与应用提供一定的参考。 展开更多
关键词 土工格栅 横肋间距 拉拔试验 离散元法 筋土界面
在线阅读 下载PDF
预制装配叠合式管廊振动台试验研究
19
作者 谷音 王浩 +2 位作者 雷准 俞柏林 陈明建 《建筑结构》 北大核心 2025年第10期114-122,99,共10页
为获取预制装配叠合式管廊地震响应规律,设计并开展了横向一致激励下预制装配叠合式管廊振动台模型试验。完成缩尺模型相似比确定、微粒混凝土的配比、地基盛土容器选取、缩尺管廊模型的制作、应变监测方案等工作。试验结果表明:地基土... 为获取预制装配叠合式管廊地震响应规律,设计并开展了横向一致激励下预制装配叠合式管廊振动台模型试验。完成缩尺模型相似比确定、微粒混凝土的配比、地基盛土容器选取、缩尺管廊模型的制作、应变监测方案等工作。试验结果表明:地基土加速度响应在强震时呈现出非线性特点;地基土位移响应在强震时呈现合理的侧向剪切变形;管廊运动受土体约束明显,其整体振动性能良好;管廊后浇混凝土应变响应大于预制侧墙;节段拼缝间预制侧墙的应变大于预制顶板、底板腋脚附近;此外,预制侧墙上端以及预制顶板腋脚附近与后浇混凝土间的新旧混凝土界面应变较大,界面稳定性较低,是抗震中需重视的关键部位。 展开更多
关键词 预制装配叠合式管廊 地震响应 振动台试验 缩尺模型 界面
在线阅读 下载PDF
固态电池测评体系的构建与挑战
20
作者 王芳 韩策 +2 位作者 王炜娜 刘仕强 李鹏 《硅酸盐学报》 北大核心 2025年第6期1478-1491,共14页
本文聚焦于全固态电池测试评价技术的现状与挑战,系统梳理全固态电池在离子传输、界面稳定性、热安全性及环境适应性等方面的新特性,分析既有测试评价体系的局限性,阐述适用于全固态电池从材料、界面、电池单体到系统、整车全层级测试... 本文聚焦于全固态电池测试评价技术的现状与挑战,系统梳理全固态电池在离子传输、界面稳定性、热安全性及环境适应性等方面的新特性,分析既有测试评价体系的局限性,阐述适用于全固态电池从材料、界面、电池单体到系统、整车全层级测试评价技术的发展架构,提出测试评价技术发展新挑战。面向测试技术发展,提出测试评价技术原位化、智能化、数据化发展方向,实现先进技术在全固态电池测试评价中的应用,助力全固态电池从研究到产业化进程。 展开更多
关键词 全固态电池 测试评价技术 固体电解质 固固界面
原文传递
上一页 1 2 132 下一页 到第
使用帮助 返回顶部