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Boussinesq Modelling of Waves and Currents in the Presence of Submerged Detached/Discontinuous Breakwaters 存在水下分离/不连续防波堤时波浪和水流的Boussinesq模型
Q3 Engineering Pub Date : 2020-12-14 DOI: 10.31534/engmod.2020.3-4.ri.03a
Mohammad Barzegar, M. Ketabdari, Kourosh Kayhan, D. Palaniappan
SUMMARY The effect of beach configurations with the main focus on the detached submerged breakwater on shoreline currents is investigated numerically. The Boussinesq equations are used to model the beach with a constant slope, continuous submerged breakwater, and discontinuous/detached submerged breakwater. Our numerical simulation results show that the transient rip currents are generated near the shoreline at the beach with constant slope while the continuous submerged breakwater structure creates a calm beach area along the shoreline. The presence of the gap in submerged breakwater changes the currents along the shoreline by generating rip currents with two pairs of vortices. One pair of vorticities, located around the gap, damage the breakwater by transmitting sediments along the breakwater foundation and eroding its surface. The second pair, created near the shoreline, erodes the shoreline due to sediment transportation and leads to a dangerous and unsafe situation for swimmers. The rip current creates five main critical areas with the maximum velocity towards the shoreline and offshore. The first set of three areas (numbered 1, 2, 3) has an approximately average velocity of 1-1.25 m/s towards the shoreline. One of these areas (numbered 2) is located close to the shoreline and the other two (numbered 1 and 3) are found breakwater and the return velocity decreases for this structure. For smaller heights (d = 3.7 and 3.2) damping is nearly the same and the returning flow varies depending on the available space through the gap. Specifically, the return velocity for d = 3.7 is higher than that for d = 3.2. The numerical results presented herein suggest that aggressive rip currents are generated in the case of detached submerged breakwater beach configurations.
摘要对以独立式水下防波堤为主要焦点的海滩形态对海岸线水流的影响进行了数值研究。Boussinesq方程用于对具有恒定坡度、连续水下防波堤和不连续/分离式水下防波堤的海滩进行建模。我们的数值模拟结果表明,恒定坡度的海滩在海岸线附近产生瞬态激流,而连续的水下防波堤结构沿着海岸线形成了平静的海滩区域。水下防波堤缺口的存在通过产生具有两对涡流的激流来改变沿海岸线的水流。位于缺口周围的一对涡流通过沿防波堤基础传输沉积物并侵蚀其表面来破坏防波堤。第二对是在海岸线附近形成的,由于沉积物的输送,侵蚀了海岸线,给游泳者带来了危险和不安全的情况。激流形成了五个主要的关键区域,其最大速度朝向海岸线和近海。第一组三个区域(编号1、2、3)朝向海岸线的平均速度约为1-1.25m/s。其中一个区域(编号2)靠近海岸线,另外两个区域(标记1和3)位于防波堤上,该结构的回流速度降低。对于较小的高度(d=3.7和3.2),阻尼几乎相同,并且回流根据通过间隙的可用空间而变化。具体而言,d=3.7的返回速度高于d=3.2的返回速度。本文给出的数值结果表明,在独立式水下防波堤海滩配置的情况下,会产生侵蚀性的激流。
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引用次数: 1
Interfacial Bond Adhesion Enhancement Mechanism Analysis of Self Stressing Alkali Activated Slag Concrete-Filled Round Steel Tube 自应力碱活化矿渣圆钢管混凝土界面粘结增强机理分析
Q3 Engineering Pub Date : 2020-12-14 DOI: 10.31534/engmod.2020.3-4.ri.07m
Yu Xiaohui, Li Yongqiang, Wang Shige
To investigate the interfacial adhesion behaviour and its enhancement mechanism of selfstressing alkali activated slag concrete-filled round steel tube, push-out samples, expansion performance test specimens, and SEM, XRD micro-test specimens were made with different dosage of calcium sulphoaluminate and calcium oxide expansive agent. The results show that the maximum interfacial adhesion stress is at 70-80 mm from the free end of the samples, and increases with the increase of the expansive agent dosage. The expansive agent such as calcium sulphoaluminate and calcium oxide can effectively reduce the drying shrinkage performance of the core concrete, and then improve the interaction between steel tube and core concrete. Microtest analysis results show that the main expansive source providing expansive power in the AASC system is Ca(OH).
为研究自应力碱活化矿渣圆钢管混凝土的界面粘附行为及其增强机理,分别用不同掺量的硫铝酸钙和氧化钙膨胀剂制作了推出试样、膨胀性能试样以及SEM、XRD微观试样。结果表明:界面黏附应力在试样自由端70 ~ 80 mm处最大,且随膨胀剂用量的增加而增大;硫铝酸钙、氧化钙等膨胀剂可有效降低核心混凝土的干燥收缩性能,进而改善钢管与核心混凝土的相互作用。微测试分析结果表明,在AASC系统中提供膨胀功率的主要膨胀源是Ca(OH)。
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引用次数: 0
Method for assessing Maintenance and maintainability in residential buildings - one of the basic categories of the social aspect of sustainable construction 住宅建筑的维护和可维护性评估方法——可持续建筑社会方面的基本类别之一
Q3 Engineering Pub Date : 2020-12-14 DOI: 10.31534/engmod.2020.3-4.ri.06m
A. Radziejowska
The article presents a proposal for a method of evaluation of one of the six main categories describing the social aspect of sustainable construction, category K5 maintenance and maintainability. The selection of proper criteria for the category assessment is based, among others, on standard EN 16309+A1:2014-12. The article presents ways of assessing different characteristics by describing the category of maintenance and maintainability. Literature studies and numerous surveys are carried out in order to determine threshold values as well as the importance of the features characterizing the examined category. Then the way of obtaining an aggregated assessment of the examined category is presented. The obtained result is then compared with an identical reference object, enabling so to determine the degree of fulfilment of the social properties contained in the analysed category. Ultimately, an analogous assessment for each of the six categories describing the social aspect of sustainable construction will make it possible to determine the social quality of residential buildings and to classify them according to the characteristics studied.
本文提出了一种评价可持续建设社会方面的六个主要类别之一的方法,即K5类别的可维护性和可维护性。类别评估的适当标准的选择是基于标准EN 16309+A1:2014-12。本文通过描述维护和可维护性的范畴,提出了评估不同特性的方法。为了确定阈值以及表征被检查类别的特征的重要性,进行了文献研究和大量调查。然后给出了对所审查的类别进行综合评估的方法。然后将获得的结果与相同的参考对象进行比较,从而确定所分析的类别中包含的社会属性的实现程度。最后,对描述可持续建筑的社会方面的六个类别中的每一个进行类似的评估,将有可能确定住宅建筑的社会质量,并根据所研究的特征对它们进行分类。
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引用次数: 0
Structural integrity of diesel generator set subjected to dynamic loads 动力载荷作用下柴油发电机组的结构完整性
Q3 Engineering Pub Date : 2020-12-14 DOI: 10.31534/engmod.2020.3-4.ri.01f
I. Senjanović, N. Vladimir, D. Čakmak
The integrity of the diesel generator set (genset) in the emergency power plant of a Nuclear Power Plant is considered. The genset consists of the diesel engine, the generator, and the common base frame on elastic spring-damper elements clamped to foundations. The genset is exposed to the seismic load, the short circuit impulse, and the synchronization failure load. The problem is solved via the finite element method (FEM). In the FE model, the diesel engine and the generator are represented with two lumped masses rigidly connected to the base frame with sets of massless bars. Strength criteria are specified according to the Russian Federal Codes and Standards in the Area of Atomic Energy Applications. The necessary number of spring-damper elements for preserving the integrity of the genset is determined.
考虑了核电站应急发电机组中柴油发电机组的完整性问题。发电机组由柴油发动机、发电机和固定在基础上的弹性弹簧阻尼器元件组成。发电机组承受地震负荷、短路冲击和同步故障负荷。采用有限元法对该问题进行了求解。在有限元模型中,柴油机和发电机用两组无质量杆与基础架刚性连接的集中质量来表示。强度标准是根据原子能应用领域的俄罗斯联邦法规和标准规定的。确定了保持发电机组完整性所需的弹簧阻尼器元件的数量。
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引用次数: 1
Automatic Reassembly Method of 3D Thin-wall Fragments Based on Derivative Dynamic Time Warping 基于导数动态时间翘曲的三维薄壁破片自动装配方法
Q3 Engineering Pub Date : 2020-07-16 DOI: 10.31534/engmod.2020.1-2.ri.03f
Siyong Fu, Lushen Wu, Qiuxiang Tao, Ying Shen
SUMMARY In order to address the automatic virtual reassembling of 3D thin-wall fragments, this paper proposes a 3D fragment reassembly method based on derivative dynamic time warping. Firstly, a calculation method of discrete curvature and torsion is designed to solve the difficulty of calculating curvature and torsion of discrete data points and eliminate effectively the noise interferences in the calculation process. Then, it takes curvature and torsion as the feature descriptors of the curve, searches the candidate matching line segments by the derivative dynamic time warping (DDTW) method with the feature descriptors, and records the positions of the starting and ending points of each candidate matching segment. After that, it designs a voting mechanism with the geometric invariant as the constraint information to select further the optimal matching line segments. Finally, it adopts the least squares method to estimate the rotation and transformation matrices and uses the iterative closest point (ICP) method to complete the reassembly of fragments. The experimental results show that the reassembly error is less than 1mm and that the reassembly effect is good. The method can solve the 3D curve matching in case there are partial feature defects, and can achieve the virtual restoration of the broken thin-wall fragment model quickly and effectively.
摘要为了解决三维薄壁碎片的自动虚拟重组问题,提出了一种基于导数动态时间规整的三维碎片重组方法。首先,设计了离散曲率和扭转的计算方法,解决了离散数据点曲率和扭转的计算困难,有效地消除了计算过程中的噪声干扰。然后,以曲率和扭转作为曲线的特征描述符,利用特征描述符对候选匹配线段进行导数动态时间规整(DDTW)方法搜索,并记录每个候选匹配线段的起始点和结束点的位置;然后,设计了以几何不变量为约束信息的投票机制,进一步选择最优匹配线段。最后,采用最小二乘法估计旋转矩阵和变换矩阵,并采用迭代最近点(ICP)法完成碎片的重组。实验结果表明,重组误差小于1mm,重组效果良好。该方法能够解决存在局部特征缺陷时的三维曲线匹配问题,能够快速有效地实现破碎薄壁碎片模型的虚拟修复。
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引用次数: 0
Roger Owen – Eminent Scientist and Extraordinary Friend 罗杰欧文-杰出的科学家和非凡的朋友
Q3 Engineering Pub Date : 2020-07-16 DOI: 10.31534/engmod.2020.1-2.ri.01p
P. Marović, M. Galić
With profound sadness we heard that Professor Roger Owen passed away on Monday 13th January 2020. He was eminent scientist, researcher, lecturer, teacher, mentor, engineer, and above all beloved husband and father, good man and reliable, altruistic, genial and extraordinary friend. With this review we want to describe, after conventional curriculum vitae, his connections with researchers and professors from the University of Split, Faculty of Civil Engineering, Architecture and Geodesy, as well as some common projects.
我们怀着深切的悲痛得知罗杰·欧文教授于2020年1月13日星期一去世。他是杰出的科学家、研究员、讲师、教师、导师、工程师,最重要的是他深爱的丈夫和父亲,是一个可靠、无私、和蔼和非凡的朋友。在这篇综述中,我们想在传统的简历之后,描述他与斯普利特大学土木工程、建筑和大地测量学院的研究人员和教授的关系,以及一些常见的项目。
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引用次数: 1
Natural vibration analysis of pressurised and rotating toroidal shell segment by Rayleigh-Ritz method 用瑞利-里兹法分析受压旋转环面壳段的自振
Q3 Engineering Pub Date : 2020-02-25 DOI: 10.31534/engmod.2019.2-4.ri.01f
I. Senjanovi, Neven Alujevi, Ivan, atipovi, Damjan, Akmak, Nikola, Vladimir, D. Cho
ENGINEERING MODELLING 32 (2019) 2-4, 57-81 57 Natural vibration analysis of pressurised and rotating toroidal shell segment by Rayleigh-Ritz method Ivo Senjanović(1), Neven Alujević(1), Ivan Ćatipović(1), Damjan Čakmak(1), Nikola Vladimir(1), Dae-Seung Cho(2) (1) University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, CROATIA e-mail: ivo.senjanovic@fsb.hr (2) Pusan National University, Department of Naval Architecture and Ocean Engineering, 63 beon-gil 2, Busandaehak-ro, Geumjeong-gu, Busan, 46239, KOREA
工程建模32(2019)2-4,57-81 57通过瑞利-里兹方法对加压和旋转环面壳体段进行自然振动分析Ivo Senjanović(1),Neven Alujevićivo.senjanovic@fsb.hr(2)釜山国立大学海军建筑与海洋工程系,韩国釜山广域市Busandaehak-ro beon gil 2 63号,46239
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引用次数: 1
Mathematical modelling for multiproduct EPQ problem featuring delayed differentiation, expedited rate, and scrap 多产品EPQ问题的延迟微分、加速速率和报废的数学建模
Q3 Engineering Pub Date : 2020-01-01 DOI: 10.31534/engmod.2020.3-4.ri.05v
S. Chiu, Jianwei Lin, Yunsen Wang, Hong-Dar Lin
The client requirements of present-day markets emphasize product quality, variety, and rapid response. To gain competitive advantages in marketplaces and meet customer needs, manufacturers today seek the most economical and fastest fabrication schemes and strategies to produce their various goods, especially when commonality exists within these multiple end products. Inspired by the above viewpoints, this study uses a mathematical modelling approach for solving a multiproduct economic production quantity (EPQ) problem featuring scrap, delayed differentiation, and expedited rate on the fabrication of the common part. We build a two-stage multiproduct fabrication scheme. Stage one uses an accelerated rate to produce all necessary common parts for multi-item to shorten its uptime, while stage two fabricates finished products sequentially using a rotation cycle rule. Inevitable random scraps produced in both stages are identified and removed to achieve the anticipated quality. We determined the optimal cost-minimization operating cycle length and used a numerical example to show our model’s capability and to explore collective and individual impacts of scrap, expedited-rate, and postponement strategies on various performances of the studied problem (such as uptime of common part, utilization, rotation cycle time, total system cost, and individual cost contributor, etc.) Our model can offer an optimization solution and in-depth managerial insights for fabrication and operations planning in a wide variety of present-day industries, such as household goods, clothing, etc.
当今市场的客户要求强调产品质量、品种和快速反应。为了在市场上获得竞争优势并满足客户需求,制造商今天寻求最经济,最快速的制造方案和策略来生产各种商品,特别是当这些多种终端产品存在共性时。受上述观点的启发,本研究采用数学建模的方法,求解公共零件制造过程中存在报废、延迟差异化和加速率的多产品经济生产数量问题。我们建立了一个两阶段的多产品制造方案。第一阶段使用加速速率生产多个项目所需的所有公共部件,以缩短其正常运行时间,而第二阶段使用旋转周期规则依次制造成品。在两个阶段产生的不可避免的随机废料被识别和去除,以达到预期的质量。我们确定了最优的成本最小化运行周期长度,并使用一个数值例子来展示我们的模型的能力,并探讨了报废、加速率和延迟策略对所研究问题的各种性能(如公共部件的正常运行时间、利用率、旋转周期时间、系统总成本和单个成本贡献者)的集体和个体影响。我们的模型可以提供优化解决方案和深入的管理见解,为制造和运营计划在各种各样的当今行业,如家居用品,服装等。
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引用次数: 2
Offloading Decision Algorithm Based on Distance Weighted K-Nearest Neighbor in Power Internet of Things 电力物联网中基于距离加权k近邻的卸载决策算法
Q3 Engineering Pub Date : 2020-01-01 DOI: 10.31534/engmod.2020.3-4.ri.04d
Jun Jia, Jiangtao Xu, Wenqing Cui, Fengbo Tao, Guojiang Zhang, Chengbo, Hu, Zhaohui Zhang, Ziquan Liu
ENGINEERING MODELLING 33 (2020) 3-4, 63-73 63 Offloading Decision Algorithm Based on Distance Weighted KNearest Neighbor in Power Internet of Things Jun Jia(1), Jiangtao Xu(1*), Wenqing Cui(2), Fengbo Tao(1), Guojiang Zhang(3), Chengbo Hu(1), Zhaohui Zhang(1), Ziquan Liu(1) (1) State Grid Jiangsu Electric Power Co. LTD. Research Institute, Nanjing 211103, CHINA e-mail: 136933974@qq.com (2) School of Information Science and Engineering, Southeast University, Nanjing 210096, CHINA (3) State Grid Jiangsu Electric Power Co. LTD., Nanjing 210000, CHINA
贾军(1),徐江涛(1*),崔文清(2),陶凤波(1),张国江(3),胡成波(1),张朝辉(1),刘子全(1).国网江苏电力有限公司。工程建模33 (2020),3-4,63-73(2)东南大学信息科学与工程学院,南京210096;(3)国网江苏电力有限公司,南京210000
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引用次数: 0
Effect of Environmental Conditions and Training Algorithms on the Efficiency of a NARX Based Approach to Predict PV Panel Power Output 环境条件和训练算法对基于NARX的光伏板输出预测方法效率的影响
Q3 Engineering Pub Date : 2020-01-01 DOI: 10.31534/engmod.2020.3-4.ri.02f
Toufik Sebbagh, Ridha Kelaiaia, A. Kerboua, Abderrazak Metatla, A. Zaatri
ENGINEERING MODELLING 33 (2020) 3-4, 27-44 27 Effect of Environmental Conditions and Training Algorithms on the Efficiency of a NARX Based Approach to Predict PV Panel Power Output Toufik Sebbagh(1*), Ridha Kelaiaia(1), Adlen Kerboua(1), Abderrazak Metatla(1), Abdelouahab Zaatri(2) (1) LGMM Laboratory, University of 20 Août 1955 Skikda, Po B 26, Skikda, 21000, ALGERIA e-mail: t.sebbagh@univ-skikda.dz (2) University of Constantine 1, Constantine, 25000, ALGERIA
环境条件和训练算法对基于NARX的光伏面板输出预测方法效率的影响Toufik Sebbagh(1*), Ridha Kelaiaia(1), Adlen Kerboua(1), Abderrazak Metatla(1), Abdelouahab Zaatri(2) (1) LGMM实验室,20 ao大学1955 Skikda, Po B 26, Skikda, 21000,阿尔及利亚e-邮件:t.sebbagh@univ-skikda.dz (2) Constantine大学1,Constantine, 25000,阿尔及利亚
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引用次数: 1
期刊
International Journal for Engineering Modelling
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