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《结构与土木工程前沿(英文)》 2021年 第15卷 第6期 页码 1480-1493 doi: 10.1007/s11709-021-0776-y
关键词: seismic active earth pressure partial seepage flow pore pressure anisotropy upper bound theorem
Modeling limit force capacities of high force to volume lead extrusion dampers
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 609-622 doi: 10.1007/s11709-021-0724-x
关键词: extrusion lead dampers upper and lower bound analytical modelling limit force
Gui-Rong Liu
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 456-477 doi: 10.1007/s11709-019-0519-5
The smoothed finite element method (S-FEM) was originated by G R Liu by combining some meshfree techniques with the well-established standard finite element method (FEM). It has a family of models carefully designed with innovative types of smoothing domains. These models are found having a number of important and theoretically profound properties. This article first provides a concise and easy-to-follow presentation of key formulations used in the S-FEM. A number of important properties and unique features of S-FEM models are discussed in detail, including 1) theoretically proven softening effects; 2) upper-bound solutions; 3) accurate solutions and higher convergence rates; 4) insensitivity to mesh distortion; 5) Jacobian-free; 6) volumetric-locking-free; and most importantly 7) working well with triangular and tetrahedral meshes that can be automatically generated. The S-FEM is thus ideal for automation in computations and adaptive analyses, and hence has profound impact on AI-assisted modeling and simulation. Most importantly, one can now purposely design an S-FEM model to obtain solutions with special properties as wish, meaning that S-FEM offers a framework for design numerical models with desired properties. This novel concept of numerical model on-demand may drastically change the landscape of modeling and simulation. Future directions of research are also provided.
关键词: computational method finite element method smoothed finite element method strain smoothing technique smoothing domain weakened weak form solid mechanics softening effect upper bound solution
宋涛,赵升吨,闫观海,刘红宝
《中国工程科学》 2013年 第15卷 第1期 页码 63-67
提出了高速伺服直驱式旋锻机结构,分析设计了基于摆线运动曲线的锤头轮廓曲线,采用上限法确定了旋锻机在极限工况下的最大输出载荷上限的变化规律。研究表明,随着进料角的增大,锻机负载有所降低,但同时工件需要更大的推进力,因此实际中采用的进料角的范围为5°~15°。
《环境科学与工程前沿(英文)》 2023年 第17卷 第6期 doi: 10.1007/s11783-023-1676-2
● A novel framework integrating quantile regression with machine learning is proposed.
关键词: Driver-response Upper boundary of relationship Interpretable machine learning Quantile regression Total phosphorus Chlorophyll a
GENG Jinju, WANG Qiang, WANG Xiaorong, NIU Xiaojun
《环境科学与工程前沿(英文)》 2007年 第1卷 第1期 页码 120-124 doi: 10.1007/s11783-007-0022-4
Optimum design and preliminary experiments of a novel parallel end traction apparatus for upper-limb
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 726-746 doi: 10.1007/s11465-021-0651-5
关键词: parallel mechanism upper-limb rehabilitation singularity and workspace analyses performance evaluation optimum design
Regeneration of vernacular architecture: new rammed earth houses on the upper reaches of the Yangtze
Jiaping LIU, Rongrong HU, Liu YANG, Runshan WANG,
《能源前沿(英文)》 2010年 第4卷 第1期 页码 93-99 doi: 10.1007/s11708-010-0002-4
关键词: earth house low-energy housing upper reaches of the Yangtze River passive solar technique
离子分离用电荷Janus结构单价选择性阳离子交换膜 Article
王文广, 张艳秋, 杨晓彬, 孙海翔, 吴亚东, 邵路
《工程(英文)》 2023年 第25卷 第6期 页码 204-213 doi: 10.1016/j.eng.2021.09.020
单价选择性阳离子交换膜(M-CEMs)已被广泛应用于环境修复和能量收集等领域,例如,从卤水和海水中提取Na+或Li+。然而,由于膜结构和材料的限制,M-CEMs存在渗透选择性低的问题。在此,我们提出了一种简单的方法以构建具有电荷Janus结构的新型M-CEMs,该结构由荷正电的均苯三甲酸/聚乙烯亚胺选择层和荷负电的商业阳离子交换膜(CEM)组成。选择性电渗析(SED)分析结果表明,具有电荷Janus结构的M-CEMs可以有效抑制多孔阳离子交换膜中存在的阴离子迁移问题,因而使这种具有电荷Janus结构的M-CEMs具有较高的渗透选择性和总阳离子通量。与最先进的单价选择性阳离子交换膜的分离性能相比,具有电荷Janus结构的M-CEMs对于Na+/Mg2+的最高渗透选择性可以达到145.77,这超过了目前单价选择性阳离子交换膜性能的“上限”,且对于Li+/Mg2+也具有优异的渗透选择性(14.11),在离子分离领域具有巨大的应用潜力。这项研究可以为具有电荷Janus结构的M-CEMs的设计提供新的见解,并应用于不同的环境和能源领域。
Design and preliminary evaluation of an exoskeleton for upper limb resistance training
Tzong-Ming WU, Dar-Zen CHEN
《机械工程前沿(英文)》 2012年 第7卷 第2期 页码 188-198 doi: 10.1007/s11465-012-0327-2
Resistance training is a popular form of exercise recommended by national health organizations, such as the American College of Sports Medicine (ACSM) and the American Heart Association (AHA). This form of training is available for most populations. A compact design of upper limb exoskeleton mechanism for home-based resistance training using a spring-loaded upper limb exoskeleton with a three degree-of-freedom shoulder joint and a one degree-of-freedom elbow joint allows a patient or a healthy individual to move the upper limb with multiple joints in different planes. It can continuously increase the resistance by adjusting the spring length to train additional muscle groups and reduce the number of potential injuries to upper limb joints caused by the mass moment of inertia of the training equipment. The aim of this research is to perform a preliminary evaluation of the designed function by adopting an appropriate motion analysis system and experimental design to verify our prototype of the exoskeleton and determine the optimal configuration of the spring-loaded upper limb exoskeleton.
关键词: exoskeleton free-weight exercise upper limb motion analysis
Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD
《能源前沿(英文)》 2015年 第9卷 第4期 页码 413-425 doi: 10.1007/s11708-015-0379-1
关键词: Takagi-Sugeno (T-S) fuzzy systems sector nonlinearity nonlinear controller linear matrix inequality (LMI) approach differential mean value theorem (DMVT) field oriented control (FOC) linear parameter varying (LPV)
王飚,王宇栋,张自华,叶献国
《中国工程科学》 2003年 第5卷 第7期 页码 58-61
为了证实水机材料的抗磨蚀和抗空蚀性能与材料的常规宏观性能之间的相依关系,选取4种具代表性的材料(碳化钨涂层、NiCr合金涂层、硼不锈钢涂层和钛),进行空蚀和磨蚀试验,并测试了它们的硬度和抗腐蚀性。试验结果表明,材料的空蚀和磨蚀抗力与硬度和抗腐蚀性有着紧密的相依关系:高硬度是抗磨蚀性优的第一判据,较强的抗腐蚀性是第二判据;高抗腐蚀性是抗空蚀性优的第一判据,较高的硬度是第二判据。
Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and
Shuvankar DAS; Debarghya CHAKRABORTY
《结构与土木工程前沿(英文)》 2022年 第16卷 第8期 页码 1040-1055 doi: 10.1007/s11709-022-0841-1
关键词: undercut vertical escarpment stability Hoek-Brown yield criterion PCP
标题 作者 时间 类型 操作
Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage
期刊论文
The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired solutions
Gui-Rong Liu
期刊论文
Approaching the upper boundary of driver-response relationships: identifying factors using a novel framework
期刊论文
Effects of environmental factors on the production and release of matrix-bound phosphine from lake sediments
GENG Jinju, WANG Qiang, WANG Xiaorong, NIU Xiaojun
期刊论文
Optimum design and preliminary experiments of a novel parallel end traction apparatus for upper-limb
期刊论文
Regeneration of vernacular architecture: new rammed earth houses on the upper reaches of the Yangtze
Jiaping LIU, Rongrong HU, Liu YANG, Runshan WANG,
期刊论文
Design and preliminary evaluation of an exoskeleton for upper limb resistance training
Tzong-Ming WU, Dar-Zen CHEN
期刊论文
Classical state feedback controller for nonlinear systems using mean value theorem: closed loop-FOC of
Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD
期刊论文