Results 51 to 60 of about 16,885 (222)
Backhoe Loader Cab Internal Acoustic Simulation and Structure Improvement [PDF]
, 2014 随着经济建设的发展与人们环保意识的提高，工程机械噪声、振动与舒适性已经是除了动力性、经济性和排放之外衡量其品质的重要指标。目前国内对运用有限元等现代设计分析方法对工程车辆驾驶室噪声进行分析、预测与控制还不成熟，相比国外企业和研究机构起步较晚，尤其是驾驶室内20~200Hz范围内的低频噪声。本文针对某型号挖掘装载机驾驶室的低频噪声问题，利用有限元法对驾驶室结构性能、驾驶室内噪声特性进行相关研究。 首先，对某型号挖掘装载机进行整机和零部件的振动噪声信号采集，并对相应的测试数据进行频谱和数值分析 ...
林森泉
core
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study investigates how the learner‐related factors of language dominance, encompassing language history, proficiency, use, and attitude, modulate congruency effects in multi‐word unit (MWU) processing among early bilinguals. Seventy Cantonese–Putonghua bilinguals completed lexical decision tasks measuring reaction time and accuracy for ...
Mingjia Cai, Yuan Liang
wiley +1 more source
Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
Gaoya dianqi, 2016 文中基于某轨道交通直流断路器的总体结构模型,设计了一种快速电磁操动机构,对其结构和工作原理进行了阐述。基于电磁场分析理论,利用有限元分析软件ANSYS对电磁机构的静态特性进行了仿真分析,得出了在合闸状态下磁场分布和动铁心所受电磁吸力情况,并对其影响因素进行了分析。然后对电磁操动机构在不同电流条件下的电磁吸力随气隙变化进行了仿真分析,得出了机构空载条件下的动态输出插值数据。最后建立直流断路器动力学分析模型,借助动力学分析软件ADAMS,将建立的动态离散数据导入其中,对直流断路器动态分合特性进行了仿真 ...
王海燕 +5 more
doaj
Improvement of column of machine tool based on modal analysis [PDF]
, 2010 机床在工作时,由于要承受各种变载荷而产生振动,其精度和寿命会受到影响,因此有必要对机床进行模态分析,了解其动态特性,以便进一步分析和改进。采用3d建模软件对机床进行建模和装配,将得到的模型导入HyPErMESH建立有限元模型,再将有限元模型导入AnSyS进行模态分析,得到机床在两种工作情况下的固有频率和振型。最后根据模态分析结果对机床立柱进行优化,得出优化结构。When the machine tool is in operation,it will undergo a variety of ...
侯亮, 潘勇军, 王其亮, 饶柳生
core
Spatially Downscaling of Future Food Demand for Policy Planning
World Food Policy, Volume 12, Issue 1, May 2026.ABSTRACT Understanding the subnational dynamics of food demand, while accounting for the evolution of the agrifood system at the global level, remains a challenge for designing food policy to ensure food security. To link global agrifood systems with subnational food policy planning, we downscale per capita food demand for 62 food commodities at the ...
Chun Song +3 more
wiley +1 more source
Structural analysis and lightweight study for the five-axis grinder bed [PDF]
, 2013 以五轴联动工具磨床的床身为研究对象,分析了磨床在极限位置使用情况下床身的静态特性,找到了床身变形最大区域。通过自由模态分析和约束模态分析,得到床身各阶模态的振动特点,并从最大变形区域中选取一点进行谐响应分析,预测床身的持续动力特性。根据分析结果,找出薄弱环节,在保证床身动静态特性不降低的基础上对床身进行轻量化研究,最终减重7.73%,节省了材料与成本。With the five-axis grinding machine tool bed as the research object, the ...
姚博世 +4 more
core
, 2019 针对传统磨削中电主轴体积大和转速低的问题,设计了一种高转速、小体积气驱研抛装置。通过理论计算对轴承承载力进行了分析,并在有限元软件中建立了装置的仿真模型,对装置刚度、固有频...福建省科技计划项目 ...
彭云峰, 曾鑫龙, 陈登铃
core +1 more source
Politics &Policy, Volume 54, Issue 2, April 2026.ABSTRACT In this paper, we investigate the adoption of carbon pricing policies within the U.S. across states. While policymakers have many tools at their disposal, carbon pricing is a policy option that utilizes market theories to curtail harmful effects from emissions through pricing structures.
Travis Wagher, Joshua Mitchell
wiley +1 more source