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工程承包联营体的柔性分析与评价

赵振宇,殷音

《中国工程科学》 2008年 第10卷 第9期   页码 84-87

摘要:

讨论了工程承包联营体环境动荡性评价指标和工程承包联营体柔性评价指标以及相应的评价方法。通过柔性分析,可以判断出工程承包联营体各方面的柔性程度能否与其相应的环境和内外部因素相适应,并为制订调整联营体柔性度的措施提供帮助,进而提高联营体的管理水平和竞争力。

关键词: 工程项目     承包商     联营体     柔性管理    

Response in piled raft foundation of tall chimneys under along-wind load incorporating flexibility of

B. R. JAYALEKSHMI,S.V. JISHA,R. SHIVASHANKAR

《结构与土木工程前沿(英文)》 2015年 第9卷 第3期   页码 307-322 doi: 10.1007/s11709-015-0288-8

摘要: The present paper deals with the numerical analysis of tall reinforced concrete chimneys with piled raft foundation subjected to along-wind loads considering the flexibility of soil. The analysis was carried out using finite element method on the basis of direct method of soil-structure interaction (SSI). The linear elastic material behavior was assumed for chimney, piled raft and soil. Four different material properties of soil stratum were selected in order to study the effect of SSI. The chimney elevation and the thickness of raft of piled raft foundation were also varied for the parametric study. The chimneys were assumed to be located in terrain category 2 and subjected to a maximum wind speed of 50 m/s as per IS:875 (Part 3)-1987. The along-wind loads were computed according to IS:4998 (Part 1)-1992. The base moments of chimney evaluated from the SSI analysis were compared with those obtained as per IS:4998 (Part 1)-1992. The tangential and radial bending moments of raft of piled raft foundation were evaluated through SSI analysis and compared with those obtained from conventional analysis as per IS:11089-1984, assuming rigidity at the base of the raft foundation. The settlements of raft of piled raft foundation, deflection of pile and moments of the pile due to interaction with different soil stratum were also evaluated. From the analysis, considerable reduction in the base moment of chimney due to the effect of SSI is observed. Higher radial moments and lower tangential moments were obtained for lower elevation chimneys with piled raft resting on loose sand when compared with conventional analysis results. The effect of SSI in the response of the pile is more significant when the structure-foundation system interacts with loose sand.

关键词: finite element method     piled raft     tall chimney     soil-structure interaction     along-wind load    

Review of

Yang YU, Jiafu TANG

《工程管理前沿(英文)》 2019年 第6卷 第2期   页码 183-192 doi: 10.1007/s42524-019-0028-1

摘要: production is regarded as a new production mode and derived from the production site of Japanese electronics industry. This production mode is proposed to overcome the low flexibility of the assembly line. production has been successfully implemented in Japanese electronics industry, such as Canon and Sony. Benefits from production include rapid response, good flexibility, and high productivity. production has received extensive attention in academic research and production practice. This study reviews the background, characteristics, types, and operation of production. The advantages and applicable scenes of production are summarized from the perspective of business practice. We compare production and famous production modes, i.e., assembly line, cellular manufacturing, and Toyota Production System. The literature on production is surveyed and classified. Furthermore, future research directions are provided.

关键词: seru production     production mode     flexibility     literature review    

Design of a novel side-mounted leg mechanism with high flexibility for a multi-mission quadruped earth

《机械工程前沿(英文)》 2023年 第18卷 第2期 doi: 10.1007/s11465-022-0740-0

摘要: Earth rover is a class of emerging wheeled-leg robots for nature exploration. At present, few methods for these robots’ leg design utilize a side-mounted spatial parallel mechanism. Thus, this paper presents a complete design process of a novel 5-degree-of-freedom (5-DOF) hybrid leg mechanism for our quadruped earth rover BJTUBOT. First, a general approach is proposed for constructing the novel leg mechanism. Subsequently, by evaluating the basic locomotion task (LT) of the rover based on screw theory, we determine the desired motion characteristic of the side-mounted leg and carry out its two feasible configurations. With regard to the synthesis method of the parallel mechanism, a family of concise hybrid leg mechanisms using the 6-DOF limbs and an L1F1C limb (which can provide a constraint force and a couple) is designed. In verifying the motion characteristics of this kind of leg, we select a typical (3-UPRU&RRRR)&R mechanism and then analyze its kinematic model, singularities, velocity mapping, workspace, dexterity, statics, and kinetostatic performance. Furthermore, the virtual quadruped rover equipped with this innovative leg mechanism is built. Various basic and specific LTs of the rover are demonstrated by simulation, which indicates that the flexibility of the legs can help the rover achieve multitasking.

关键词: design synthesis     parallel mechanism     hybrid leg mechanism     screw theory     quadruped robot    

住宅建筑需求侧柔性——定义、柔性负荷及量化方法 Review

罗正意, 彭晋卿, 曹静宇, 殷荣欣, 邹斌, 谭羽桐, 严晋跃

《工程(英文)》 2022年 第16卷 第9期   页码 123-140 doi: 10.1016/j.eng.2022.01.010

摘要:

本文综述了近年来关于住宅建筑需求侧柔性的定义、柔性负荷及柔性量化方法方面的研究。首先,针对建筑需求侧柔性、运行柔性和能源柔性等不同的术语,进行了系统的比较和区分;其次,对住宅建筑主要柔性负荷的运行特性和柔性能力进行了总结和比较;再次,对柔性负荷的建模方法和柔性量化指标也进行了详细的综述和总结。最后,提出了当前建筑需求侧柔性领域存在的一些亟待解决的问题。研究结果表明当前针对住宅建筑需求侧柔性的研究主要以中央空调、储水式电热水器、湿电器、冰箱和照明为主,分别占现有研究的36.7%、25.7%、14.7%、9.2%和8.3%。这些柔性负荷在运行特性、使用频率和柔性能力
方面存在较大的差异,而对于它们实际的响应特性有待进一步研究。此外,本文给出了用于柔性负荷建模的白箱、灰箱和黑箱模型在不同应用场合下适用性的建议;对于柔性量化指标,现有研究主要从功率、时间、能量、效率、经济性和环保性等维度提出了大量的指标,但是缺少统一的柔性量化体系。本文能够帮助读者更好地理解建筑需求侧柔性、区分与柔性相关的不同的术语、了解住宅建筑不同柔性负荷的运行特性和柔性能力,同时也能为柔性负荷的建模和柔性量化的相关研究提供指导。

关键词: 住宅建筑     需求侧柔性     柔性负荷     建模方法     量化指标    

Meshing stiffness property and meshing status simulation of harmonic drive under transmission loading

《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0674-6

摘要: The multitooth meshing state of harmonic drive (HD) is an important basic characteristic of its high transformation precision and high bearing capacity. Meshing force distribution affects the load sharing of the tooth during meshing, and theoretical research remains insufficient at present. To calculate the spatial distributed meshing forces and loading backlashes along the axial direction, an iterative algorithm and finite element model (FEM) is proposed to investigate the meshing state under varied transmission loading. The displacement formulae of meshing point under tangential force are derived according to the torsion of the flexspline cylinder and the bending of the tooth. Based on the relationship of meshing forces and circumferential displacements, meshing forces and loading backlashes in three cross-sections are calculated with the algorithm under gradually increased rotation angles of circular spline, and the results are compared with FEM. Owing to the taper deformation of the cup-shaped flexspline, the smallest initial backlash and the earliest meshing point appear in the front cross-section far from the cup bottom, and then the teeth in the middle cross-section of the tooth rim enter the meshing and carry most of the loading. Theoretical and numerical research show that the flexibility is quite different for varied meshing points and tangential force amplitude because of the change of contact status between the flexspline and the wave generator. The meshing forces and torsional stiffness of the HD are nonlinear with the torsional angle.

关键词: harmonic drive     meshing flexibility matrix     meshing force     loading backlash     flexspline     contact analysis    

Analysis of the dynamic stress of planar flexible-links parallel robots

DU Zhaocai, YU Yueqing, YANG Jianxin

《机械工程前沿(英文)》 2007年 第2卷 第2期   页码 152-158 doi: 10.1007/s11465-007-0025-7

摘要: This paper presents a method for the dynamic stress analysis of planar parallel robots with flexible links and a rigid moving platform. The finite element-based dynamic model of flexible parallel robots is proposed. The relation between elastic deformations and elastic displacements of the flexible links is investigated, considering the coupling effects of elastic motion and rigid motion. The elastic deformations of links are calculated. Considering the effects of bending-shearing strain and tensile-compression strain, the dynamic stress of the links and its position are derived by using the Kineto-Elastodynamics theory and the Timoshenko beam theory. Due to the flexibility of the links, the dynamic stresses are well illustrated through numerical simulation. Compared with the results of the finite element software SAMCEF, the numerical simulation results show the good coherence and advantages of the analysis method. The dynamic stress analysis is demonstrated to have a significant impact on the analysis, design and control of flexible parallel robots.

关键词: numerical simulation     Due     coupling     software SAMCEF     flexibility    

Effect of succinic acid deamidation-induced modification on wheat gluten

Lan LIAO, Mouming ZHAO, Haifeng ZHAO, Jiaoyan REN, Chun CUI, Xiao HU,

《化学科学与工程前沿(英文)》 2009年 第3卷 第4期   页码 386-392 doi: 10.1007/s11705-009-0250-1

摘要: The effect of succinic acid deamidation-induced modification on wheat gluten was investigated in the present study. The changes of surface hydrophobicity, functional properties, secondary structure, and sensibility of proteolysis of modified samples were determined. The solubility of deamidated proteins increased in the isoelectric region of untreated wheat gluten. The isoelectric point of succinic acid deamidated wheat gluten was shifted to a basic pH and existed in the broad pH regions. Foaming property and molecular flexibility of wheat gluten were improved after the modification. The hydrolysis degree of the hydrolysates in proteolysis with flavorzyme and pancreatin increased after succinic acid deamidation. Moreover, succinic acid deamidation-induced modification resulted in little change in molecular weight and secondary structure of the protein. Thus, succinic acid could facilitate unfolding protein conformation. In addition, it could improve protein-water interactions, surface properties, and sensibility of the proteolysis of the deamidated wheat gluten.

关键词: pH     isoelectric     conformation     deamidation-induced modification     molecular flexibility    

基于深度学习技术的集群电动汽车及家庭热水系统灵活性预测 Article

胡俊杰, 周华嫣然, 周羿宏, 张海婧, Lars Nordströmd, 杨光亚

《工程(英文)》 2021年 第7卷 第8期   页码 1101-1114 doi: 10.1016/j.eng.2021.06.008

摘要:

随着电网中间歇性可再生能源发电规模的增大,为了保证电能质量和频率的稳定性,电网对可控资源的需求也随之增加。需求响应(demand response, DR)资源的灵活性已成为解决这一问题的一个有价值的方法。然而,目前关于DR资源的灵活性预测问题尚未得到充分的研究。本研究应用一种深度学习技术,即结合时间卷积神经网络的Transformer模型(temporal convolution network-combined transformer)来预测电动汽车与家庭热水系统两种DR资源的聚合灵活性。所提出的灵活性预测方法使用了基于DR资源的历史用电数据以及为了辅助预测所提出的DR信号数据。所提方法不仅可以预测聚合灵活性的大小,还可以预测其维持时间。最后,本文通过算例仿真验证了灵活性预测结果的准确性。仿真结果表明,在不同的灵活性维持时间下,DR资源灵活性的大小会发生变化。文中所提出的DR资源灵活性预测方法展现了其在释放需求侧资源的灵活性以向电网提供备用容量方面的应用。

关键词: 负荷灵活性     电动汽车     家庭热水系统     结合时间卷积神经网络的Transformer模型     深度学习    

A new damage quantification approach for shear-wall buildings using ambient vibration data

Seung-Hun SUNG,Hyung-Jo JUNG

《结构与土木工程前沿(英文)》 2015年 第9卷 第1期   页码 17-25 doi: 10.1007/s11709-014-0278-2

摘要: This paper presents a new approach to estimate damage severity for shear-wall buildings using diagonal terms of a modal flexibility matrix estimated from dynamic properties. This study aims to provide a fundamental concept for quantifying the damage of realistic buildings by investigating an idealized shear-wall building. Numerical studies were performed on a 5-story shear-wall building model to validate the applicability of the presented approach, using two damage patterns. With the numerical simulations, the proposed approach accurately determined the damage ratio of the specimens. Experiments were also conducted on a 5-story shear-wall building model for which the system parameters were almost the same as those in numerical simulations. The estimated damage-quantification results from the experimental validations demonstrated that the performance of the presented method for shear-wall buildings was both suitable and accurate.

关键词: damage identification     modal flexibility     damage quantification     shear-wall buildings    

灵活可变的运动图像的分割算法

赵彦玲,张之超,高振,张庆超

《中国工程科学》 2006年 第8卷 第5期   页码 84-87

摘要:

运动图像的分割在基于内容的视频编码及视频检索中占有重要的地位。利用运动图像帧中的时空域信息,提出了一种分割运动对象的方法。其最大的特点是灵活性,可以根据序列的实际情况来选择算法。实验证明分割效果较好并节省了处理时间。

关键词: 时空结合     运动区域     运动对象     形态梯度算子     灵活性    

流程工业智能制造展望:过程系统工程师面临的挑战

Lockhart Bogle Ian David

《工程(英文)》 2017年 第3卷 第2期   页码 161-165 doi: 10.1016/J.ENG.2017.02.003

摘要:

本文讨论了流程工业智能制造对过程系统工程(PSE) 研究人员提出的挑战。现有的研究在实现全厂和全站点优化方面已经取得了很大进展,进行基准化测试能够增加说服力。本文进一步讨论了过程系统工程师在开发可用工具和技术时遇到的技术性挑战,包括灵活性和不确定性,响应性和敏捷性,鲁棒性和安全性,混合物性质和功能的预测,以及新的建模和数学范式。利用大数据进行智能化开发来驱动系统灵活性需要面对新的挑战,例如,如何在漫长又复杂的供应链中确保数据的一致性和机密性。建模方面也存在很多挑战,涉及如何对所有的关键技术进行恰当的建模,特别是健康、安全和环境方面,需要在特定地点对微小却关键的量进行准确预测。对环境方面的关注要求我们紧密跟踪所有的分子种类,以便于它们能被最佳地用于创造可持续的解决方案。而源自于新型个性化产品的破坏性商业模式对环境的影响则难以预测。

关键词: 智能制造     过程系统工程     不确定性     灵活性     优化     基于模型的控制    

Superhydrophobic, mechanically flexible and recyclable reduced graphene oxide wrapped sponge for highly efficient oil/water separation

Lijuan Qiu, Ruiyang Zhang, Ying Zhang, Chengjin Li, Qian Zhang, Ying Zhou

《化学科学与工程前沿(英文)》 2018年 第12卷 第3期   页码 390-399 doi: 10.1007/s11705-018-1751-6

摘要:

Water pollution has become an urgent issue for our modern society, and it is highly desirable to rapidly deal with the water pollution without secondary pollution. In this paper, we have prepared a reduced graphene oxide (RGO) wrapped sponge with superhydrophobicity and mechanically flexibility via a facile low-temperature thermal treatment method under a reducing atmosphere. The skeleton of this sponge is completely covered with RGO layers which are closely linked to the skeleton. This sponge has an abundant pore structure, high selectivity, good recyclability, low cost, and outstanding adsorption capacity for floating oil or heavy oil underwater. In addition, this sponge can maintain excellent adsorption performance for various oils and organic solvents over 50 cycles by squeezing, and exhibits extremely high separation efficiencies, up to 6 × 106 and 3.6 × 106 L·m−3·h−1 in non-turbulent and turbulent water/oil systems, respectively. This superhydrophobic adsorbent with attractive properties may find various applications, especially in large-scale removal of organic contaminants and oil spill cleanup.

关键词: superhydrophobicity     mechanically flexibility     water/oil separation     reduced graphene oxide wrapped sponge    

循环流化床燃烧低污染排放技术研究展望

柯希玮,蒋苓,吕俊复,岳光溪

《中国工程科学》 2021年 第23卷 第3期   页码 120-128 doi: 10.15302/J-SSCAE-2021.03.009

摘要:

在污染物排放标准日趋严格、 2060 年前实现碳中和的背景下,深度挖掘循环流化床(CFB)燃烧技术的低污染排放潜力,进一步提高 CFB 锅炉的市场竞争力,对于煤炭清洁高效利用、能源转型升级具有重要意义。本文在阐述 CFB 燃烧污染物排放特性的基础上,分析了主流 CFB 锅炉低污染排放技术及应用,结合我国能源发展战略和相关政策,提出了 CFB 燃烧在污染物排放控制技术方面的发展建议。研究认为,需大力开发炉内原始低排放 CFB 燃烧技术,在保证锅炉效率的前提下,通过流态重构、燃烧组织来突破 CFB 锅炉污染物排放极限。着眼于煤炭能源长远发展,支持与超临界 / 超超临界,智能运行,碳捕集、利用与封存,储能等技术高度结合的新一代超低排放 CFB 燃烧技术研发;加快对现存中小容量 CFB 锅炉的优化升级;发挥 CFB 燃烧燃料适应性广的优势,推广生物质燃烧发电,促进对低热值燃料、城市垃圾、各工业废弃物的低成本高效清洁消纳;挖掘 CFB 锅炉的深度调峰能力并保持低污染排放性能,提高运行灵活性及对新能源的消纳能力;加强 CFB 燃烧脱硫灰渣的综合利用,关注 N2O 排放问题。还需从全局角度合理制定污染物排放标准和相关政策,引导包括 CFB 燃烧在内的能源行业健康发展。

关键词: 煤炭清洁利用     循环流化床     污染控制     碳中和     燃料适应性     新能源消纳    

标题 作者 时间 类型 操作

工程承包联营体的柔性分析与评价

赵振宇,殷音

期刊论文

Response in piled raft foundation of tall chimneys under along-wind load incorporating flexibility of

B. R. JAYALEKSHMI,S.V. JISHA,R. SHIVASHANKAR

期刊论文

Review of

Yang YU, Jiafu TANG

期刊论文

Design of a novel side-mounted leg mechanism with high flexibility for a multi-mission quadruped earth

期刊论文

住宅建筑需求侧柔性——定义、柔性负荷及量化方法

罗正意, 彭晋卿, 曹静宇, 殷荣欣, 邹斌, 谭羽桐, 严晋跃

期刊论文

Meshing stiffness property and meshing status simulation of harmonic drive under transmission loading

期刊论文

Analysis of the dynamic stress of planar flexible-links parallel robots

DU Zhaocai, YU Yueqing, YANG Jianxin

期刊论文

Effect of succinic acid deamidation-induced modification on wheat gluten

Lan LIAO, Mouming ZHAO, Haifeng ZHAO, Jiaoyan REN, Chun CUI, Xiao HU,

期刊论文

基于深度学习技术的集群电动汽车及家庭热水系统灵活性预测

胡俊杰, 周华嫣然, 周羿宏, 张海婧, Lars Nordströmd, 杨光亚

期刊论文

A new damage quantification approach for shear-wall buildings using ambient vibration data

Seung-Hun SUNG,Hyung-Jo JUNG

期刊论文

灵活可变的运动图像的分割算法

赵彦玲,张之超,高振,张庆超

期刊论文

流程工业智能制造展望:过程系统工程师面临的挑战

Lockhart Bogle Ian David

期刊论文

Superhydrophobic, mechanically flexible and recyclable reduced graphene oxide wrapped sponge for highly efficient oil/water separation

Lijuan Qiu, Ruiyang Zhang, Ying Zhang, Chengjin Li, Qian Zhang, Ying Zhou

期刊论文

循环流化床燃烧低污染排放技术研究展望

柯希玮,蒋苓,吕俊复,岳光溪

期刊论文