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Multiple Tuned Mass Dampers and Double Tuned Mass Dampers for Soft Story Structures: A Comparative Study 软层结构中多重调谐质量阻尼器与双调谐质量阻尼器的比较研究
Q4 Earth and Planetary Sciences Pub Date : 2023-11-14 DOI: 10.37394/232025.2023.5.19
Farah Alnayhoum, Ibrahima Kalil Camara, Si̇nan Meli̇h Ni̇gdeli̇, Gebrai̇l Bekdaş
Recent seismic events have highlighted the vulnerability of reinforced concrete buildings, especially soft-story structures, to damage and collapse during strong earthquakes due to the ground's vibrational response. This study aims to mitigate these adverse vibrations using passive control mechanisms, particularly tuned mass dampers (TMDs). Conventional TMDs require a substantial mass to effectively influence the structure's lateral reactions. The research explores the use of multi-tuned mass dampers (MTMDs) and double-tuned mass dampers (DTMDs) in a soft-story building. The study uses MATLAB to estimate TMD parameters and subject the models to seismic loading. The comparative assessment of these models reveals the potential benefits of using MTMD and DTMD systems to enhance the seismic resilience of soft-story structures.
最近的地震事件凸显了钢筋混凝土建筑的脆弱性,特别是软层结构,由于地面的振动反应,在强震期间容易损坏和倒塌。本研究旨在利用被动控制机制,特别是调谐质量阻尼器(TMDs)来减轻这些不利的振动。传统的tmd需要相当大的质量来有效地影响结构的侧向反应。研究了多调谐质量阻尼器(MTMDs)和双调谐质量阻尼器(DTMDs)在软层建筑中的应用。利用MATLAB对TMD参数进行估计,并对模型进行地震荷载作用。通过对两种模型的对比分析,揭示了MTMD和DTMD系统在提高软层结构抗震性能方面的潜在优势。
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引用次数: 0
Random Furrowing for a Stochastic Unit Commitment Solution 随机单元承诺解的随机犁沟
Q4 Earth and Planetary Sciences Pub Date : 2023-11-06 DOI: 10.37394/232025.2023.5.14
P. C. Thomas, Shinosh Mathew, Bobin K Mathew
The Unit Commitment Problem involves the inherent difficulty of obtaining optimal combinatorial power generation schedules over a future short term period. The formulation of the generalized Unit Commitment Schedule formulation involves the specific combination of generation units at several de-rated capacities during each hour of the planning horizon, the load demand profile, load indeterminateness and several other operating constraints. This largely deterministic schedule continues to find favor with several plant operators, keeping in mind the close operating time-periods involved. However, the deterministic nature of the load profile is sought to be phased out by a stochastic pattern that is realistic and mirrors real-life situations, owing to modern trends in Demand side management. This shift is in tune with the ongoing power restructuring activities of electricity power reforms. The stochastic profile is obtained by a suitably tuned 2-parameter Weibull distribution that uses appropriate shape and scale parameters. The resulting band of generated load profiles are used to evaluate net power and penal costs associated with a set of pervasive randomized probability indices. The exact UCS comprises of a specific unit absolute state corresponding to a certain time period within the planning horizon. Subsequently, regression analysis is applied to establish the correlation between the absolute states and the cumulative randomized load demand against the intervals within the planning horizon. This method is analogous to random furrowing of probabilistic demand profile.
机组承诺问题涉及到在未来短期内获得最优组合发电计划的内在困难。广义机组承诺计划的制定涉及到在规划视界内每小时几个降级容量的发电机组的具体组合、负荷需求概况、负荷不确定性和其他几个运行约束。这种很大程度上确定的计划继续受到一些核电站运营商的青睐,因为它们要考虑到所涉及的近段运行时间。然而,由于需求方面管理的现代趋势,负荷概况的确定性性质被一种现实的、反映现实情况的随机模式所逐步消除。这种转变与正在进行的电力改革的电力结构调整活动是一致的。随机轮廓是由一个适当调整的2参数威布尔分布,使用适当的形状和尺度参数。产生的负荷分布的结果带被用来评估与一组普遍随机概率指数相关的净功率和惩罚性成本。精确的UCS包括与规划范围内的特定时间段相对应的特定单元绝对状态。随后,运用回归分析方法建立了绝对状态与累计随机负荷需求在规划区间内的相关性。这种方法类似于概率需求曲线的随机翻沟。
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引用次数: 0
Application of Analytical Hierarchy Process (AHP) in the Selection of a Flexible Production System 层次分析法在柔性生产系统选择中的应用
Q4 Earth and Planetary Sciences Pub Date : 2023-11-06 DOI: 10.37394/232025.2023.5.15
Sara Srebrenkoska, Aleksandra Apostolova, Misko Dzidrov, Dejan Krstev
The Analytic Hierarchy Process (AHP) is a structured technique for organizing and analyzing complex decisions, based on mathematics and psychology. It has application in group decision-making and is used worldwide in a wide variety of decision-making situations. Rather than prescribing a ""correct"" decision, AHP helps decision-makers choose the decision that best fits their goal and their understanding of the problem. The technique provides a comprehensive and rational framework for structuring a decision problem, representing and quantifying its elements, relating those elements to general objectives, and evaluating alternative solutions. Given each specific situation, making the right decisions is probably one of the most difficult challenges for managers. The obtained results allow the manager to evaluate the employees in an objective way and make an objective decision for their promotion. This tool not only supports and qualifies decisions, but also allows managers to justify their choices as well as simulate possible outcomes.
层次分析法(AHP)是一种基于数学和心理学的结构化技术,用于组织和分析复杂的决策。它适用于群体决策,并在世界范围内广泛应用于各种决策情况。AHP不是规定一个“正确的”决策,而是帮助决策者选择最适合他们的目标和他们对问题的理解的决策。该技术为构建决策问题、表示和量化其元素、将这些元素与一般目标联系起来以及评估可选的解决方案提供了一个全面而合理的框架。考虑到每种具体情况,做出正确的决策可能是管理者面临的最困难的挑战之一。获得的结果使管理者能够客观地评价员工,并为他们的晋升做出客观的决策。这个工具不仅支持和限定决策,而且还允许管理人员证明他们的选择是正确的,并模拟可能的结果。
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引用次数: 0
Feasibility Study and Design of a Stand-alone Floating Photovoltaic Structure for Toshka Lake 托什卡湖独立式浮动光伏结构的可行性研究与设计
Q4 Earth and Planetary Sciences Pub Date : 2023-11-06 DOI: 10.37394/232025.2023.5.17
Hanaa M. Farghally, Emad A. Sweelem
A novel energy production system known as floating photovoltaic technology has captured the interest of many people due to its many advantages. The floating photovoltaic system contributes to a reduction in water evaporation and an increase in energy output. The development of floating photovoltaic power plants necessitates the study of these systems from both an electrical and mechanical structure perspective for research objectives. Numerous studies have been conducted on floating photovoltaic systems from various angles that have examined these systems. The goal of this paper is to provide a standard design procedure and performance for the construction of a floating photovoltaic energy system at the surface of Toshka lake for the generation of electricity to a household using PV Syst. software. Also it provides a logical analysis and up-todate assessment of the many characteristics and elements of floating photovoltaic systems as an energy production system. The performance ratio analysis reveals that the lowest value was obtained in the month of March is 64% and the maximum value was obtained in the month of December is 82%whereas the average value for year is 71.3%. Analysis of losses has also been done.
一种被称为浮动光伏技术的新型能源生产系统因其诸多优点而引起了许多人的兴趣。浮动光伏系统有助于减少水蒸发和增加能源输出。浮式光伏电站的发展需要从电气和机械结构两个角度对其进行研究。从不同角度对浮动光伏系统进行了大量的研究,对这些系统进行了检验。本文的目标是为Toshka湖表面浮动光伏能源系统的建设提供一个标准的设计程序和性能,该系统用于使用光伏系统为家庭发电。软件同时,对浮动光伏发电系统作为一种能源生产系统的诸多特点和要素进行了逻辑分析和最新评估。绩效比分析表明,3月份最低,为64%,12月份最高,为82%,全年平均值为71.3%。对损失也进行了分析。
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引用次数: 0
Monitoring of Manufacturing Processes Based on Econometric Computational Control 基于计量计算控制的制造过程监控
Q4 Earth and Planetary Sciences Pub Date : 2023-11-06 DOI: 10.37394/232025.2023.5.16
Daniela Ghelase, Luiza Daschievici
In order to address the present-day changes and tendencies, the industrial enterprise has advanced in its manner of approaching the manufacturing processes by performing a high integration of operations, functions and compartments. One can say that we are dealing with a single structure, with no organising levels, of the enterprise which reacts to inputs and manufactures the requested product by almost immediately adapting to the customers’ requirements or to the requirements of other interested parties.
为了应对当今的变化和趋势,工业企业通过执行操作、功能和部门的高度集成,在接近制造过程的方式上取得了进步。可以说,我们正在处理的是企业的单一结构,没有组织层次,它对输入作出反应,并通过几乎立即适应客户的要求或其他相关方的要求来生产所要求的产品。
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引用次数: 0
Pair Programming – Cubic Prediction Model Results for Random Pairs and Individual Junior Programmers 结对编程-随机结对和个人初级程序员的立方预测模型结果
Q4 Earth and Planetary Sciences Pub Date : 2023-11-06 DOI: 10.37394/232025.2023.5.18
Mary Adebola Ajiboye, Matthew Sunday Abolarin, Johnson Adegbenga Ajiboye, Abraham Usman Usman, Sanjay Misra
Due to the rapidly evolving technology in the dynamic world, there is a growing desire among software clients for swift delivery of high-quality software. Agile software development satisfies this need and has been widely and appropriately accepted by software professionals. The maintainability of such software, however, has a significant impact on its quality. Unfortunately, existing works neglected to consider timely delivery and instead concentrated primarily on the flexibility component of maintainability. This research looked at maintainability as a function of time to rectify codes among Individual Junior and Random pair software developers. Data was acquired from an experiment performed on software developers in the agile environment and analyzed to develop the quality model metrics for maintainability which was used for prediction. One hundred programmers each received a set of agile codes created in the Python programming language, with deliberate bugs ranging from one to ten. The cubic regression model was used for predicting time spent on debugging errors above ten bugs. Results show that the random pair programmers spent an average time of 21.88 min/error while the individual programmers spent a lesser time of 16.57 min/error.
由于动态世界中技术的快速发展,软件客户对快速交付高质量软件的需求日益增长。敏捷软件开发满足了这一需求,并已被软件专业人员广泛而适当地接受。然而,此类软件的可维护性对其质量有重大影响。不幸的是,现有的工作忽略了考虑及时交付,而是主要集中在可维护性的灵活性部分。该研究将可维护性视为时间的函数,以纠正单个初级和随机配对软件开发人员之间的代码。通过对敏捷环境下的软件开发人员进行实验获取数据,并对数据进行分析,开发用于预测可维护性的质量模型度量。100名程序员每人收到了一组用Python编程语言编写的敏捷代码,其中包含从1到10不等的故意错误。三次回归模型用于预测调试10个以上错误所花费的时间。结果表明,随机结对编程人员的平均出错时间为21.88 min,而单独编程人员的平均出错时间为16.57 min。
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引用次数: 0
Facility Layout optimization through Quality Function Deployment 通过质量功能部署优化设施布局
Q4 Earth and Planetary Sciences Pub Date : 2023-10-23 DOI: 10.37394/232025.2023.5.13
Raluca Dovleac (Nicolaescu)
The paper addresses the critical concern of facility layout planning and design, driven by the imperative to maximize space utilization, enhance product flow, minimize manufacturing costs, and boost employee satisfaction. Effective facility layout design emerges as a cornerstone for achieving these objectives, contributing significantly to a company's overall success. It aligns production processes with strategic goals, optimizing spatial resources and fostering a conducive work environment. A central focus of this research is the exploration of Quality Function Deployment (QFD) as a tool for facility layout design. The author investigates its applicability across different industries, offering insights into its adaptation for specific needs. Case studies spanning sectors like healthcare, manufacturing, and education illustrate the versatility of QFD in addressing unique requirements. Ultimately, this study seeks to provide a generalized approach that can be readily tailored to meet the specific needs of any company, thereby advancing the field of facility layout planning and design.
本文从最大限度地利用空间、提高产品流动、降低制造成本和提高员工满意度的角度出发,阐述了工厂布局规划和设计的关键问题。有效的设施布局设计是实现这些目标的基石,对公司的整体成功做出了重大贡献。它使生产过程与战略目标保持一致,优化空间资源,营造有利的工作环境。本研究的一个中心焦点是探索质量功能部署(QFD)作为设施布局设计的工具。作者调查了它在不同行业的适用性,为其适应特定需求提供了见解。跨越医疗保健、制造业和教育等行业的案例研究说明了QFD在解决独特需求方面的多功能性。最终,本研究旨在提供一种通用的方法,可以很容易地定制,以满足任何公司的具体需求,从而推进设施布局规划和设计领域。
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引用次数: 0
Notes on Various Transforms Identified by Some Special Functions with Complex (or Real) Parameters and Some of Related Implications 关于复(实)参数特殊函数所识别的各种变换及其意义的注释
Q4 Earth and Planetary Sciences Pub Date : 2023-10-18 DOI: 10.37394/232025.2023.5.12
Hüseyi̇n Irmak, Tolga Han Açikgöz
The fundamental aim of this special research is first to introduce certain essential information in regards to some special functions, which are the Gamma function and the Beta function and play a big role in both (applied) mathematics and most engineering sciences, and then to present both a number of their familiar properties and several relationships between them. Afterward, various possible-undeniable effects of those special functions in the transformation theory, their special implications, and suggestions for the relevant researchers will be also considered as special information.
这项特殊研究的基本目的是首先介绍一些关于特殊函数的基本信息,这些函数是Gamma函数和Beta函数,它们在(应用)数学和大多数工程科学中都起着重要作用,然后介绍它们的一些熟悉的性质和它们之间的一些关系。之后,这些特殊功能在转化理论中可能产生的各种不可否认的影响,以及它们的特殊含义,以及对相关研究者的建议也将被视为特殊信息。
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引用次数: 0
Modern Methods for Modelling Bolted Joints at the Assembly Stage – A Systematic Review 装配阶段螺栓连接建模的现代方法-系统回顾
Q4 Earth and Planetary Sciences Pub Date : 2023-09-27 DOI: 10.37394/232025.2023.5.11
Rafał Grzejda
The main aim of the paper is to catalog ways of modeling bolted joints and introducing bolt preload using the finite element method. The paper presents models of bolted joints published in the current decade (i.e. after 1 January 2021 and up to 10 May 2023) in journals of the world's largest scientific publishers, such as: Elsevier, Springer, and MDPI, among others. Reporting of the systematic review was carried out based on PRISMA guidelines. The databases were searched with the EBSCO multi-search engine for the following keywords: bolted joint model, bolted connection model, preload, and finite element method. Additionally, the search results were narrowed down to peer-reviewed papers from the discipline of engineering and written in English. This yielded 2,712 records for further analysis. After removing duplicates from this group, screening was carried out, based on which 1,476 records were excluded from the study. For the remaining group of reports, an eligibility assessment was performed, after which a further 210 reports were excluded from the study. Finally, 86 papers were included in the review. As a result of their examination, six groups of simplified fastener models currently used in the modeling of bolted joints at the assembly stage were described.
本文的主要目的是对螺栓连接的建模方法进行分类,并用有限元法介绍螺栓预紧力。本文介绍了最近十年(即2021年1月1日之后至2023年5月10日)在世界上最大的科学出版商期刊上发表的螺栓连接模型,如:爱思唯尔,施普林格和MDPI等。系统评价的报告是根据PRISMA指南进行的。利用EBSCO多搜索引擎对数据库进行关键词检索:螺栓连接模型、螺栓连接模型、预紧力、有限元法。此外,搜索结果被缩小到来自工程学科的同行评议论文,并用英语写作。这产生了2712条记录供进一步分析。在从该组中删除重复数据后,进行筛选,在此基础上排除了1476份记录。对于剩余的一组报告,进行了合格性评估,之后又有210份报告被排除在研究之外。最终,86篇论文被纳入综述。根据他们的研究结果,描述了目前在装配阶段螺栓连接建模中使用的六组简化紧固件模型。
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引用次数: 0
Some Questions of Computational Models in Continuum Mechanics 连续介质力学中计算模型的几个问题
Q4 Earth and Planetary Sciences Pub Date : 2023-09-15 DOI: 10.37394/232025.2023.5.10
Evelina Prozorova
The aim of the work is to study some issues of establishing the generality of experimental and numerical methods, the possibilities of describing a continuous medium using discrete representations of computational mathematics, the influence of the choice of basis functions on calculation errors. The previously proposed model of continuum mechanics is discussed, including the general action of forces and distributed moments of forces, as well as the role of boundary conditions in Hamiltonian mechanics, especially in frequently used computational solutions to problems in mechanics. The Runge-Kutta difference scheme for a system of partial differential equations is analyzed. Examples are given.
本工作的目的是研究建立实验和数值方法的通用性,使用计算数学的离散表示描述连续介质的可能性,基函数的选择对计算误差的影响等问题。讨论了先前提出的连续介质力学模型,包括力的一般作用和力的分布矩,以及边界条件在哈密顿力学中的作用,特别是在力学问题的常用计算解中。分析了一类偏微分方程组的龙格-库塔差分格式。给出了实例。
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引用次数: 0
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世界地震工程
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