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A Numerical Study for Novel Thin-Walled Compound Structures Made of PPR Material Reinforced with AL Shells 用 AL 外壳增强 PPR 材料制成的新型薄壁复合结构的数值研究
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188573
A. Mahuof, Mohammed H. Mahmood, Arz Qwam Alden, Akram S. Mahmood, Osama A. Mohsen
Thin-walled compound structures are usually utilized as improved impact energy-absorbing members in the structures of aircraft and automobiles because of their high energy absorption capacity via progressive plastic deformation. Although these thin structures have outstanding impact performance, high manufacturing costs are a big issue that has the potential to increase vehicle prices. High quality and lightweight are also important fundamentals in the manufacture of absorber devices. Hence, in this numerical and experimental study, novel thin-walled compound structures made of polypropylene random copolymer (PPR) and aluminum alloy (AL 6082 T6) were proposed to provide a reasonable solution for these issues as possible. Static Structural Analysis in ANSYS Workbench was utilized to simulate three types of thin-walled structure models made of these suggested materials under static axial loads and full plastic conditions, namely PPR, AL, and the novel PPR-AL-PPR. The purpose of that is to compare crashworthiness properties among each model and investigate the mechanical behavior of a failure, crush force efficiency and energy absorption capacity for each model. The results observed that the novel model (PPR-AL-PPR) is the optimal type in terms of improvements in crashworthiness properties in comparison to other traditional models, where the crush force efficiency and energy absorption capacity increased numerically by approximately 26% and 107%, respectively. The data have been validated with experimental results, and most of these findings were rather compatible. In conclusion, the PPR material reinforced by AL shells can significantly improve the crush force efficiency and the energy absorption capacity of thin-walled structures. Hence, the novel model suggested could be applied to vehicles and aircraft structures as a good absorber device
薄壁复合结构通常被用作飞机和汽车结构中的改进型冲击能量吸收构件,因为它们通过渐进塑性变形具有很高的能量吸收能力。虽然这些薄结构具有出色的抗冲击性能,但制造成本高是一个大问题,有可能导致汽车价格上涨。高质量和轻量化也是制造吸收装置的重要基础。因此,在这项数值和实验研究中,提出了由聚丙烯无规共聚物(PPR)和铝合金(AL 6082 T6)制成的新型薄壁复合结构,以尽可能合理地解决这些问题。利用 ANSYS Workbench 中的静态结构分析功能,模拟了在静态轴向载荷和全塑性条件下由这些建议材料制成的三种薄壁结构模型,即 PPR、AL 和新型 PPR-AL-PPR。其目的是比较每种模型的耐撞性,并研究每种模型失效时的力学行为、挤压力效率和能量吸收能力。结果表明,与其他传统模型相比,新型模型(PPR-AL-PPR)在提高耐撞性能方面是最佳类型,其挤压力效率和能量吸收能力在数值上分别提高了约 26% 和 107%。这些数据已与实验结果进行了验证,大多数结果都相当吻合。总之,由 AL 壳体增强的 PPR 材料可以显著提高薄壁结构的压溃力效率和能量吸收能力。因此,所建议的新型模型可作为一种良好的吸收装置应用于车辆和飞机结构中。
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引用次数: 0
The Effect of Intertextuality on the Semantic Level of Architectural Form 互文性对建筑形式语义层面的影响
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188561
Aya Shukri Mohammed, Zhiman Ismael, K. Khalil
All creative fields, but especially architecture, are affected by intertextuality. To know how the notion of "intertextuality" affects the semantic sense of form in architecture, this study initially examines how it applies to literacy and then architecture. The objective is to determine how intertextuality affects architecture and how it could transmit a form's senses. The problem with intertextuality as an approach is that it doesn't provide designers with a clear path to follow. As a consequence, based on the idea of intertextuality in literacy, six steps are found from the theoretical framework to be steps of the intertextuality process in architecture. Case studies and a questionnaire are used for applying these steps. The study's results show that intertextuality has a significant impact and that each step of the intertextuality process intensely shows that the form's meaning might be changed from semantic to syntactic by the architect by including an intertextual idea in its design.
所有创意领域,尤其是建筑领域,都会受到互文性的影响。为了了解 "互文性 "这一概念如何影响建筑中的形式语义,本研究首先探讨了它如何适用于扫盲,然后是建筑。目的是确定互文性如何影响建筑,以及如何传递形式的感觉。作为一种方法,互文性的问题在于它没有为设计师提供一条清晰的路径。因此,根据识字中的互文性思想,从理论框架中找到了建筑中互文性过程的六个步骤。在应用这些步骤时,使用了案例研究和问卷调查。研究结果表明,互文性具有重要影响,互文性过程的每个步骤都强烈表明,建筑师通过在设计中加入互文性理念,可以将形式的意义从语义转变为句法。
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引用次数: 0
Design a Robust Optimal Proportional-Integral-Derivative Controller for CE152 Magnetic Levitation System Using Bee Colony Algorithm 利用蜂群算法为 CE152 磁悬浮系统设计稳健的最优比例-积分-微分控制器
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188572
Hassan S. Al-Nahhal, Moayed Almobaied
One of the most popular methods for giving feedback to the control loop in industrial control systems is the proportional-integral-derivative (PID) controller. The tuning of the PID controller, however, is currently being researched by engineers. In this research, a robust PID controller is proposed for the CE152 magnetic levitation system. Magnetic levitation, commonly referred to as maglev, is a technology that uses magnetic fields to levitate an object, such as a vehicle or train, above a track. By using magnetic forces to counteract gravitational and inertial forces, maglev systems can achieve frictionless movement and potentially higher speeds compared to conventional wheeled transportation. In this research, the robust PID controller is involved by computing all stabilized PID controller gains for the affine linear characteristic polynomial in the presence of uncertain parameters using the parameter space approach and the edge theorem. The results of the parameter space approach are ranges of PID gains (𝐾 𝑃 , 𝐾 𝐷 , 𝐾 𝐼 ) . Here, the optimal PID gains were chosen by the Artificial Bee Colony optimization algorithm to get optimal performance for CE152 magnetic levitation. The research defines a specific performance index function that quantifies the system's time-domain step response criteria (small overshoot percentage with significant minimization of both settling and rising times). This index function is inversely proportional to the desired performance criteria, aiming to optimize the system's performance. MATLAB simulations are used to validate and demonstrate the efficiency of the proposed graphical method for enhancing stability in the maglev system.
在工业控制系统中,向控制回路提供反馈的最常用方法之一是比例-积分-派生(PID)控制器。然而,工程师们目前正在研究如何调整 PID 控制器。本研究为 CE152 磁悬浮系统提出了一种稳健的 PID 控制器。磁悬浮通常被称为磁悬浮,是一种利用磁场将汽车或火车等物体悬浮在轨道上的技术。通过利用磁力抵消重力和惯性力,磁悬浮系统可以实现无摩擦运动,与传统的轮式运输相比,速度可能更高。本研究采用参数空间法和边缘定理,在参数不确定的情况下计算仿射线性特征多项式的所有稳定 PID 控制器增益,从而实现鲁棒 PID 控制器。参数空间法的结果是 PID 增益的范围(参数 𝑃 ,参数 𝐷 ,参数 𝐼 )。在此,通过人工蜂群优化算法选择最佳 PID 增益,以获得 CE152 磁悬浮的最佳性能。该研究定义了一个特定的性能指标函数,用于量化系统的时域阶跃响应标准(过冲百分比小,沉降和上升时间显著最小化)。该指数函数与所需的性能标准成反比,旨在优化系统性能。MATLAB 仿真验证并证明了所提出的图形方法在增强磁悬浮系统稳定性方面的效率。
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引用次数: 0
Scheduling the Laterals of Shattulhilla River by Utilizing the Genetic Algorithm as Water Sustainability Technique 利用遗传算法作为水资源可持续性技术安排沙图勒希拉河的输水线路
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188483
A. Hommadi, Alaa A. Abass, A. Al-fawzy, F. Al-Mohammed, N. A. Al-ansari, Hatem H. Hussien
Open channels are very important to deliver water from main sources to laterals especially for developing countries. Production is subjective by the way that the water is scheduled, and this scheduling is subject to several irrigation constraints. In open channel projects, for instance, maximum discharge of the laterals and main channels, depending on the size of their dimensions and the water requirements for fields. The current paper shows how efficient water scheduling, regarding the delivering water from the main channel to laterals in consequent time slots, can be done by utilizing a genetic algorithm optimisation technique. This research is intended to be applied for scheduling the Shattulhilla River in Babylon City and has broad applications for open channel projects in Iraq. The obtained results clarify how the genetic algorithm optimisation modelling is a sophisticated tool which operators of irrigation projects could now utilize to timetable open channels of irrigation systems.
明渠对于将水从干渠输送到支渠非常重要,尤其是在发展中国家。产量取决于水量调度方式,而水量调度又受到多种灌溉限制因素的制约。例如,在明渠工程中,渠道和干渠的最大排水量取决于其尺寸大小和田间需水量。本文介绍了如何利用遗传算法优化技术进行高效的水量调度,即在相应的时间段内从主渠道向侧渠输水。这项研究旨在应用于巴比伦市 Shattulhilla 河的水量调度,并广泛应用于伊拉克的明渠工程。研究结果阐明了遗传算法优化模型是一种先进的工具,灌溉工程的运营商现在可以利用它来制定灌溉系统明渠的时间表。
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引用次数: 0
Groundwater Quality Analysis by Integrating Water Quality Index, GIS Techniques and Supervised Machine Learning: A Case Study in Duhok Province, Iraq 通过整合水质指数、地理信息系统技术和监督机器学习进行地下水质量分析:伊拉克杜胡克省案例研究
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188474
H. Nazif
This paper presents a case study focusing on the analysis of the Water Quality Index (WQI) using ArcGIS Pro and supervised machine learning (SML) techniques. The study aims to analyze the selection of physicochemical water quality indicators in water wells to determine the most effective physicochemical water quality parameters in water wells, in addition to finding the WQI of each well in Duhok province and its purpose of use. These parameters include Calcium, Magnesium, Chloride, Sodium, Potassium, Sulfate, pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Nitrate, Total Alkalinity (TA), and Total Hardness (TH). The study generated a spatial distribution map of the WQI, revealing the highest values in wells located in the Sumil district, ranging between 18.47 and 57.9, while the lowest value of 18.47 was observed in the Akre district. Supervised machine learning algorithms were employed to identify the most influential physicochemical indicators of water quality. The results highlighted EC, TA, TH, and Ca+2 as the most crucial parameters affecting WQI. The mapping analysis further indicated that wells in the Sumil district exhibited the highest values of EC, TH, Mg+2, and TA. Conversely, the Duhok district demonstrated the highest calcium levels, while the lowest pH and nitrate levels were observed in the Duhok and Amedi districts, respectively. The Zakho district showcased the highest levels of sulfate and potassium, and the Bardarash district had the highest chloride and sodium values.
本文介绍了一项案例研究,重点是利用 ArcGIS Pro 和有监督机器学习 (SML) 技术分析水质指数 (WQI)。该研究旨在分析水井理化水质指标的选择,以确定水井中最有效的理化水质参数,此外还查找杜霍克省每口水井的 WQI 及其使用目的。这些参数包括钙、镁、氯、钠、钾、硫酸盐、pH 值、电导率 (EC)、总溶解固体 (TDS)、硝酸盐、总碱度 (TA) 和总硬度 (TH)。研究绘制了水质指数空间分布图,显示苏米尔区的水井水质指数最高,介于 18.47 和 57.9 之间,而阿克雷区的水井水质指数最低,为 18.47。采用监督机器学习算法来确定最有影响力的水质理化指标。结果表明,EC、TA、TH 和 Ca+2 是影响水质指数的最关键参数。绘图分析进一步表明,苏米尔区的水井显示出最高的 EC、TH、Mg+2 和 TA 值。相反,杜霍克区的钙含量最高,而杜霍克区和阿梅迪区的 pH 值和硝酸盐含量分别最低。扎胡区的硫酸盐和钾含量最高,巴尔达拉什区的氯化物和钠含量最高。
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引用次数: 0
Optimizing Time Consumption for Smartphone-based Distributed Parallel Processing System 优化基于智能手机的分布式并行处理系统的时间消耗
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188570
Nashma Muhammed, Zryan Rashid, Subhi R. M. Zeebaree, Jihan Rasool, R. Zebari, Mohammed Sadeeq
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引用次数: 0
Reliability of Digital Image Correlation Techniques for Cementitious Composite Fracture Characterization 用于水泥基复合材料断裂表征的数字图像相关技术的可靠性
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188477
Haruna Ibrahim, George Wardeh, Hanaa Fares
Conventional devices used for measuring strain, like strain gauges and LVDTs, typically used as single-point sensors, require enhanced precision of gathered data, encompassing accuracy and consistency. However, these instruments are incapable of generating strain maps. Furthermore, it requires more time and precision during the set-up test. However, this study assesses the reliability of digital image correlation (DIC) methods as a non-destructive and helpful tool for monitoring the development of cracks in cementitious composites by comparing the DIC test and the mechanical test (Machine test) results. In the objective study, three types of mortars were prepared: Normal Strength Mortar (NSM), High Strength Mortar (HSM), and High Strength Mortar with Fly Ash (HSMFA). Steel 13 mm in length and synthetic fibres 19mm and 54 mm in length (short and long) were mixed into the composites in varied volume ratios, ranging from 0% to 1. Pre-notched 40x40x160 mm prismatic specimens were tested in three-point bending while being simultaneously filmed to track the crack's growth. The results showed that the post-cracking behaviour switches from softening to hardening for some types of mortar and certain fibre dosages. To evaluate the reliability of DIC for the characterisation of fracture properties, the vertical displacements for all specimens were analysed using GOM correlate software and compared with machine test data. The use of the DIC approach for the measurement of crack opening and the interpretation of the results in terms of Force-crack mouth opening displacement (CMOD) were made possible by the good agreement between the results regarding vertical deflection for all the employed mortars.
用于测量应变的传统设备,如应变片和 LVDT,通常用作单点传感器,需要提高收集数据的精度,包括准确性和一致性。然而,这些仪器无法生成应变图。此外,在设置测试过程中需要更多的时间和精度。不过,本研究通过比较数字图像相关性(DIC)测试和机械测试(机器测试)结果,评估了数字图像相关性(DIC)方法作为监测水泥基复合材料裂缝发展的非破坏性和有用工具的可靠性。在目标研究中,制备了三种砂浆:普通强度砂浆(NSM)、高强度砂浆(HSM)和含粉煤灰的高强度砂浆(HSMFA)。将长度为 13 毫米的钢材和长度为 19 毫米和 54 毫米的合成纤维(短纤维和长纤维)以 0% 至 1 的不同体积比混合到复合材料中。在三点弯曲试验中,对预缺口为 40x40x160 毫米的棱柱试样进行了测试,同时对裂纹的生长过程进行了跟踪拍摄。结果表明,对于某些类型的砂浆和某些纤维用量,开裂后的行为会从软化转为硬化。为了评估 DIC 用于断裂特性表征的可靠性,使用 GOM correlate 软件对所有试样的垂直位移进行了分析,并与机器测试数据进行了比较。由于所有使用的砂浆在垂直变形方面的结果都非常一致,因此可以使用 DIC 方法测量裂缝张开情况,并用力-裂缝口张开位移(CMOD)来解释结果。
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引用次数: 0
The Khabour River as the Backbone of Urban Mental Image: Examining Spatial and Social Visibility in Zakho City 作为城市心智形象支柱的哈布尔河:考察扎胡市的空间和社会能见度
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188555
Lawand Kamal Othman, Ahmed Mohammed
This study examines the role of the river as the backbone of the urban mental image in Zakho City and investigates the interplay between spatial and social visibility. Focusing on the River Khabour, this research unravels the ways in which the river shapes the perception and imageability of Zakho City. The study takes into account the historical context and different historical periods to understand the river's influence on the city's spatial configuration. Through a comprehensive analysis of spatial and social visibility, the research explores how the presence of the river impacts the perception and use of public spaces in Zakho City. It employs space syntax methodology, including the analysis of axial lines and the isovist analysis, to assess the spatial visibility of key areas along the river. Additionally, land-use patterns and pedestrian observations are employed to evaluate the social visibility and user dynamics of these spaces. The findings reveal that the current distribution of the city’s elements is in a situation of de-contact with the river; landmarks and nodes are placed far from the waterfront, and no significant paths pass by the shore. The integration levels of the streets show that in the historic periods, the major generator of the pattern was the river, but as time passed, the high integration levels seemed to be in the deep structure of the city, and only the old bridges maintained their value. Even new bridges have low integration values. The study sheds light on the complex relationships that exist between natural characteristics and urban development. The research problem is that when we investigate the city of Zakho and the presence of the Khabor river, The city's physical and visible relationship to the river has deteriorated. The main issue that this study investigates is stating that fact. The research has implications for urban planning and design, highlighting how rivers may be used as amplifiers to improve a city's overall livability and image.
本研究探讨了河流作为扎胡市城市精神形象支柱的作用,并研究了空间能见度与社会能见度之间的相互作用。本研究以哈布尔河为重点,揭示了河流塑造扎胡城感知和形象的方式。研究考虑了历史背景和不同的历史时期,以了解河流对城市空间结构的影响。通过对空间和社会能见度的综合分析,研究探讨了河流的存在如何影响人们对扎霍市公共空间的感知和使用。研究采用了空间合成方法,包括轴线分析和等值线分析,以评估沿河主要区域的空间可见度。此外,还利用土地使用模式和行人观察来评估这些空间的社会能见度和用户动态。研究结果表明,目前城市元素的分布处于与河流脱节的状态;地标和节点远离滨水区,没有重要的路径经过河岸。街道的融合度表明,在历史时期,城市格局的主要形成因素是河流,但随着时间的推移,融合度高的地方似乎都在城市的深层结构中,只有老桥还保持着其价值。即使是新桥,其融合值也很低。这项研究揭示了自然特征与城市发展之间存在的复杂关系。研究的问题是,当我们调查扎霍市和哈博尔河的存在时,城市与河流的有形和无形关系已经恶化。本研究调查的主要问题就是陈述这一事实。这项研究对城市规划和设计具有重要意义,它强调了如何利用河流作为放大器来改善城市的整体宜居性和形象。
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引用次数: 0
iPARK: A Participatory Design Tool of Neighborhood Parks Using Visual Programming Language iPARK:使用可视化编程语言的街区公园参与式设计工具
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188547
Ahmed Khairadeen Ali, Awar Naaman Saleem, Haneen Hashim Mohammed Ali
Participatory design and community engagement in the neighborhood parks guide the landscape architect to create a successful and fitting park to community needs. However, the community members are limited to visual, writing, and descriptive tools to explain their vision of the neighbourhood park to the landscape designer. Therefore, this paper proposes iPARK, a platform that helps non-landscape majors visualise their ideas and vision of park design configurations, activities, materials, and needs using simplified design tools. The iPARK platform consists of two modules: iPARK-Design module utilises visual programming to automate and aid the design drawings of the neighbourhood park; the iPARK-Simulate module uses multi-agent-based simulation to fit the best parameters of the community needs and propose alternatives for the proposed design. The Case study depicted successful results and the platform delivered high-quality results and easy use. It is expected that iPARK will encourage the community to participate in the design decisions, lay out their visions, and communicate with the landscape architect more clearly.
街区公园的参与式设计和社区参与指导景观设计师成功地创建了一个符合社区需求的公 园。然而,社区成员只能通过视觉、文字和描述工具来向景观设计师解释他们对街区公园的愿景。因此,本文提出 iPARK 这一平台,帮助非景观专业人员使用简化的设计工具,将他们对公园设计配置、活动、材料和需求的想法和愿景可视化。iPARK 平台由两个模块组成:iPARK-设计模块利用可视化编程自动辅助绘制街区公园的设计图;iPARK-模拟模块利用基于多代理的模拟来适应社区需求的最佳参数,并为拟议的设计提出替代方案。案例研究取得了成功的结果,该平台提供了高质量的结果且易于使用。预计 iPARK 将鼓励社区参与设计决策,提出他们的愿景,并与景观设计师进行更清晰的沟通。
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引用次数: 0
Full P Seismic Performance Assessment of Reinforced Concrete Buildings Using Collapse Fragility Curve aper Title in Title Case Full P 使用坍塌脆弱度曲线评估钢筋混凝土建筑的抗震性能 title in title Case
Pub Date : 2024-01-01 DOI: 10.24271/psr.2024.188471
Ali Alrawas, Reem Alsehnawi
Obtaining a collapse fragility curve is essential for loss estimation and structural safety studies, especially for vital facilities such as health centres. Many methods have been presented to develop fragility curves, such as the analytical method, which involves performing a series of nonlinear dynamic analyses, and empirical methods. This paper presents a study on the seismic performance assessment against the collapse of code-compliant reinforced concrete buildings. The study was carried out at Al-Qutayfah Hospital, located in a moderate seismicity area in Rif Dimashq, Syria. This hospital is representative of many modern hospitals built after 2004. A 3D analytical model was created using CSI-PERFORM 3D. The shear wall cross-section was modelled as a fibre section and a concentrated hinge for the frames to capture the essential nonlinear behaviour of the main elements and the potential collapse mode. An incremental dynamic analysis was performed using 11 pairs of ground motion records in accordance with FEMA P-58 recommendations to derive the collapse fragility and compare it to another result that converts the static pushover curve to an incremental dynamic analysis curve using the Vamvatsikos & Cornell method known as SPO2IDA. The results showed that the building had a low and acceptable probability of collapse under the code-defined MCE intensity level and that the SPOTOIDA method provides a reliable estimate of collapse fragility, saving time and effort.
获得倒塌脆性曲线对于损失估计和结构安全研究至关重要,尤其是对于医疗中心等重要设施。目前已提出了许多绘制脆性曲线的方法,如分析方法(包括进行一系列非线性动态分析)和经验方法。本文介绍了对符合规范的钢筋混凝土建筑进行抗震性能评估的研究。研究在位于叙利亚大马士革农村省中度地震区的 Al-Qutayfah 医院进行。该医院是 2004 年后建成的许多现代化医院的代表。使用 CSI-PERFORM 3D 创建了三维分析模型。剪力墙横截面被模拟为纤维截面和框架的集中铰链,以捕捉主要构件的基本非线性行为和潜在的倒塌模式。根据 FEMA P-58 的建议,使用 11 对地面运动记录进行了增量动态分析,得出了倒塌脆性,并与使用 Vamvatsikos 和 Cornell 方法(即 SPO2IDA)将静态推移曲线转换为增量动态分析曲线的另一个结果进行了比较。结果表明,在规范定义的 MCE 强度等级下,该建筑的倒塌概率较低,可以接受,而且 SPOTOIDA 方法可以可靠地估算倒塌脆性,省时省力。
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引用次数: 0
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