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Effect of different types of waste materials used between double glazing box to isolate fatigue test machine noise 采用不同类型的废材对双层玻璃箱之间的效果进行隔声疲劳试验机
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/ER.1407
S. Almuradi
This study examines air, recycled plastic grains, fibers from rubber shreds and sawdust fibers as sound insulation materials to attenuate sound produced from continuous working lab fatigue test machine. These waste materials are filled in between a double glazed-aluminum framed box. The sound attenuation is tested at three studied 0.5, 1.0 and 1.5 m distances. Since the sound wave is propagated in three dimensions, the experimental work is employed in four upper, fronts, motor and sample fixture side directions. Moreover, the study is extended to examine temperature increase due to enclosing. Tests of sound level are carried out with closed and opened inlet and outlet designed slotting according to a box size. Gradual sound attenuation reaches 18, 20, 22 and 25% for air, plastic grains, rubber and sawdust fibers, respectively. The present work proves that waste materials are efficient in noise removal from sound sources. Also, they help the environment cleanliness from synthetic disposable bottles and tires as well as bio-wood wastes and assist the sustainability of earth.
本研究考察了空气、再生塑料颗粒、橡胶碎片纤维和锯末纤维作为隔声材料来衰减实验室连续工作疲劳试验机产生的声音。这些废料被填在一个双层玻璃铝框盒子之间。在0.5米、1.0米和1.5米的距离上测试了声衰减。由于声波是三维传播的,因此实验工作在上、前、电机和试样夹具侧四个方向进行。此外,研究还扩展到研究封闭引起的温度升高。声级试验采用按箱体尺寸设计的进出口开闭开槽进行。空气、塑料颗粒、橡胶和木屑纤维的逐渐声衰减分别达到18%、20%、22%和25%。本研究证明了废弃物对声源噪声的去除是有效的。此外,他们帮助环境清洁从合成一次性瓶子和轮胎以及生物木材废料,并协助地球的可持续发展。
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引用次数: 0
Computer simulation of deformation and fracture conditions during the detail rolling with a flange with inclined rolls 斜辊凸缘细轧变形及断裂条件的计算机模拟
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/er.1483
S. Ignatiev, P. Kononov, D. Levashov, E. K. Muratbakeev, Konstantin O. Glazunov
An adequate computer model of the process of rolling flange details with inclined rolls has been built in the software package DEFORM-3D. The analysis of the stress-strain state of a detail with a flange was performed. The rheological properties of the alloy L63 (62-65% Cu, 34.5-38% Zn) were experimentally studied. Value limits of the Cockcroft-Latham fracture criterion for the alloy L63 are determined.
在DEFORM-3D软件中建立了斜辊轧制法兰细部过程的计算机模型。对带法兰的细部进行了应力-应变状态分析。对L63 (62-65% Cu, 34.5-38% Zn)合金的流变特性进行了实验研究。确定了L63合金的Cockcroft-Latham断裂准则的极限值。
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引用次数: 0
Research, processing and analysis of exploitation reliability results of high-speed radial diesel engine 高速径向柴油机开发可靠性结果的研究、处理与分析
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/ER.1580
Luka Mihanović, Hrvoje Karna, D. Matika
This paper presents the research on reliability of high-speed radial marine diesel engine Zvijezda M 504 B2 based on experimental data of malfunctions on the engine and time required for repair. Exploitation reliability and failure intensity were calculated from operational data collected from the engine log book. Results were tested by computer program to determine the relevance of the obtained results. Mathematically calculated reliability model of high-speed radial marine diesel engine Zvijezda M 504 B2 showed continuous increasing function of the intensity of failure and the fact that the reliability of the engine can be reliably approximated by Weibull distribution. Based on the obtained results it has been shown that this distribution, regardless of its complexity, should be used in practice when calculating reliability of engines with similar constant and growing malfunction’s intensity. The conclusion is that proposed distribution enables a better depiction of the observed technical system and the impact of aging of components on the system reliability.
本文根据Zvijezda m504b2型船用高速径向柴油机的故障试验数据和维修时间,对该柴油机的可靠性进行了研究。利用从发动机日志中收集的运行数据,计算了开发可靠性和故障强度。用计算机程序对所得结果进行检验,以确定所得结果的相关性。对Zvijezda m504b2型船用高速径向柴油机的可靠性模型进行了数学计算,结果表明,该发动机的可靠性随故障强度呈连续递增的函数,可以用威布尔分布可靠地逼近。结果表明,该分布无论多么复杂,在实际工作中,在计算具有相似常数且故障强度不断增大的发动机的可靠性时,都应采用该分布。结论是,所提出的分布能够更好地描述所观察到的技术系统以及部件老化对系统可靠性的影响。
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引用次数: 1
Effect of radial impeller size in the presence and absence of baffles on the copper exchange on zeolite NaX 有无挡板时径向叶轮尺寸对NaX沸石上铜交换的影响
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/er.1574
Sandra Svilović, M. Ćosić, Anita Bašić
Effect of hydrodynamics on ion exchange in a batch reactor is still not appropriately studied even though proper mixing parameters may considerably affect the process of solid suspension and its costs. In this work, hydrodynamic conditions generated by straight blade turbine (SBT) impellers on suspension in the batch reactor with and without baffles were investigated. The aim of this work was to analyze influence of impeller diameter and zeolite mass on just suspended impeller speed, (NJS) power consumption, maximum amount of copper exchanged onto zeolite NaX and copper exchange kinetics as well. All experiments were conducted at the same temperature, initial concentration of the copper solution and zeolite particle size. The obtained results showed that just suspended impeller speed decreases as impeller diameter increases in the reactor with and without baffles but this trend is considerably more pronounced in the reactor with baffles. The increase in zeolite mass causes a slight increase of NJS in the both reactor. In the reactor with the baffles this increment became noticeably higher as impeller diameter decrease. Power consumption, at the state of complete zeolite suspension, decreases as impeller diameter increases and its values in the reactor without baffles are considerably lower as well. Kinetics results indicated that the amount of copper ion increases significantly in the initial stage and then gradually until the equilibrium is reached for all hydrodynamics conditions and mass of zeolite examined.
流体力学对间歇反应器中离子交换的影响尚未得到适当的研究,尽管适当的混合参数对固体悬浮过程及其成本有很大的影响。本文研究了带挡板和不带挡板的间歇式反应器中直叶涡轮(SBT)叶轮悬浮时的水动力条件。分析了叶轮直径和沸石质量对刚悬浮叶轮转速、(NJS)功耗、铜在沸石NaX上的最大交换量和铜交换动力学的影响。所有实验均在相同温度、铜溶液初始浓度和沸石粒径下进行。结果表明,在有挡板和不加挡板的反应器中,刚悬浮叶轮转速随叶轮直径的增大而减小,但在有挡板的反应器中这种趋势更为明显。沸石质量的增加导致两个反应器中NJS的轻微增加。在有挡板的反应器中,随着叶轮直径的减小,该增量明显增大。沸石完全悬浮状态下的能耗随着叶轮直径的增大而减小,无挡板反应器的能耗值也明显降低。动力学结果表明,在所有流体力学条件和沸石质量条件下,铜离子的量在初始阶段显著增加,然后逐渐增加,直到达到平衡。
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引用次数: 3
A comprehensive study of diagnosis faults techniques occurring in photovoltaic generators 光伏发电机组故障诊断技术的综合研究
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/ER.1714
S. T. Kebir, N. Cheggaga, M. S. A. Cheikh, M. Haddadi, H. Rahmani
Recently, many focuses have been done in the field of renewable energies, especially in solar photovoltaic energy. Photovoltaic generator, considered as the heart of any photovoltaic installation, exhibits sometimes malfunctions which involve degradations on the overall photovoltaic plant. Therefore, diagnosis techniques are required to ensure failures detection. They avoid dangerous risks, prevent damages, allow protection, and extend their healthy life. For these purposes, many recent studies have given focuses on this field. This paper summarizes a large number of such interesting works. It presents a survey of photovoltaic generator degradations kinds, several types of faults, and their major diagnosis techniques. Comparative studies and some critical analyses are given. Other trending diagnosis solutions are also discussed. A proposed neural networks-based technique is developed to clarify the main process of diagnosis techniques, using artificial intelligence. This method shows good results for modelling and diagnosing the healthy and faulty (shaded) photovoltaic array.
近年来,可再生能源领域,特别是太阳能光伏领域受到了广泛的关注。光伏发电机被认为是任何光伏装置的核心,有时会出现故障,这涉及到整个光伏电站的退化。因此,需要诊断技术来保证故障检测。他们避免危险的风险,防止损害,允许保护,并延长他们的健康寿命。为此,近年来许多研究都对这一领域给予了关注。本文总结了大量这类有趣的作品。介绍了光伏发电机组退化的种类、几种故障类型及其主要诊断技术。并进行了比较研究和批判性分析。还讨论了其他趋势诊断解决方案。提出了一种基于神经网络的技术,利用人工智能来阐明诊断技术的主要过程。该方法对健康和故障(阴影)光伏阵列进行建模和诊断,取得了良好的效果。
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引用次数: 0
Thermochemical conversion of plant biomass in the energotechnological complex with heat recovery 带热回收的能源技术复合体中植物生物质的热化学转化
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/er.1554
M. Zablodskiy, A. Zhyltsov, I. Radko, V. Trokhaniak, S. Pugalendhi, P. Subramanian
Basic performance principles of the energotechnological complex used for thermochemical conversion of plant biomass with the influence of a magnetic field and high recovery of spent heat carrier energy have been developed. The concurrent saturation of a spent heat carrier in a loading bunker with the steam from humid biomass aimed at using a certain part of a spent heat carrier, which is clear from oxygen and nitrogen oxide, and moisture in thermochemical recovery has been considered as an important aspect of recuperation processes. A mathematical model has been developed and the results of numerical simulation have been presented for determining the distribution of temperature, velocity and pressure fields in a loading bunker. Prospective assessment of the engineering solutions developed for heat energy recovery of a double-flow spent heat carrier has been conducted.
研究了利用磁场作用对植物生物质进行热化学转化和废热载体能量高回收率的能量技术复合物的基本性能原理。在装载舱中,废热载体与来自潮湿生物质的蒸汽同时饱和,目的是利用废热载体的某一部分,该部分从氧和氮氧化物中清除,热化学回收中的水分被认为是回收过程的一个重要方面。本文建立了装载仓内温度场、速度场和压力场分布的数学模型,并给出了数值模拟结果。对双流废热载体热能回收工程方案进行了前瞻性评价。
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引用次数: 0
Adaptive decoupling control for binary distillation column into a 3D virtual environment 二元精馏塔三维虚拟环境自适应解耦控制
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/er.1480
J. S. Useche-Castelblanco, Darío Amaya-Hurtado, O. Reyes-Ortiz
The oil refinery plants have a particularly high energy consumption in the distillation process. Several authors state that these are the systems with the highest energy consumption in the petrochemical industry. Currently, work is being done on the implementation of adaptive controllers in order to improve the efficiency of the distillation process and the quality of the product. In this work the control of a binary distillation column developed within a 3D virtual laboratory is presented. Adaptive control by reference model (MRCA) is used for the manipulation of bottom and distillate concentrations. Initially, the mathematical description of the process is obtained, together with the computer-aided design, to subsequently implement the control technique. As a result, the behavior of the controlled system in simulation is shown and compared with the response of the embedded system within the virtual environment. The main contribution of this work is the interaction that a user can have with this type of processes and the possibility of implementing modern control strategies within this type of environments as a low-cost tool to support education and training activities.
炼油厂在蒸馏过程中能耗特别高。几位作者指出,这些是石化工业中能耗最高的系统。目前,为了提高蒸馏过程的效率和产品的质量,正在进行自适应控制器的实施工作。本文介绍了在三维虚拟实验室中开发的二元精馏塔的控制。参考模型自适应控制(MRCA)用于控制底部和馏分浓度。首先,获得过程的数学描述,并结合计算机辅助设计,随后实现控制技术。结果显示了被控系统在仿真中的行为,并与嵌入式系统在虚拟环境中的响应进行了比较。这项工作的主要贡献是用户可以与这种类型的过程进行交互,以及在这种类型的环境中实现现代控制策略作为支持教育和培训活动的低成本工具的可能性。
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引用次数: 0
Simplified methodology for testing common rail piezoelectric injectors taking into account reference characteristics 考虑参考特性的共轨压电喷油器的简化测试方法
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/er.1475
T. Stoeck, Karol Franciszek Abramek, T. Osipowicz
The article presents the methodology of testing Continental/Siemens VDO piezoelectric injectors. To determine the correctness of their operation, the reference characteristics were used, which, due to the lack of guidelines from the manufacturer, constituted the only reference base for the obtained expenses and the intensity of fuel overflows. Simultaneously, the phase of the active experiment was simplified by limiting the number of measuring points, and then estimating the missing data using the Aitken iterative technique. Automation of the calculation process was obtained thanks to the proprietary numerical algorithm, whose formulas were introduced into a standard spreadsheet.
本文介绍了大陆/西门子VDO压电喷射器的测试方法。为了确定其操作的正确性,使用了参考特性,由于缺乏制造商的指导方针,这构成了获得费用和燃料溢出强度的唯一参考基础。同时,通过限制测点数量来简化主动实验阶段,然后利用艾特肯迭代技术估计缺失数据。计算过程的自动化得益于专有的数值算法,其公式被引入到标准电子表格中。
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引用次数: 4
Real-time friction torque estimation on a diesel engine using the crankshaft speed fluctuation 基于曲轴转速波动的柴油机摩擦力矩实时估计
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/er.1515
S. Mohammed, Lakhdari A. Amina
Under the pressure of stricter regulations on pollutant emissions and the desire of users for lower fuel consumption and more comfortable driving, engine control based on torque has been developed. To provide an accurate estimate of effective torque, friction losses must be modeled. The details of a model that predicts the total instantaneous friction torque for compression ignition engines are described. The model is based on a combination of the dynamic model of the crankshaft and the thermodynamic model. The total instantaneous friction torque is determined using the instantaneous measurements or numerical predictions of the gas pressure in the combustion chamber, the rotational speed of the crankshaft and the load torque. The experimental data and the numerical simulation results were compared. The comparison between the different variables shows a good agreement between the simulation and the experimental results.
在污染物排放法规日益严格的压力下,以及用户对更低油耗、更舒适驾驶的渴望下,基于扭矩的发动机控制得到了发展。为了提供有效扭矩的准确估计,必须对摩擦损失进行建模。介绍了压燃式发动机总瞬时摩擦力矩预测模型的详细情况。该模型建立在曲轴动力学模型和热力学模型相结合的基础上。总瞬时摩擦扭矩是利用燃烧室内气体压力、曲轴转速和负载扭矩的瞬时测量或数值预测来确定的。对实验数据和数值模拟结果进行了比较。不同变量的比较表明,仿真结果与实验结果吻合较好。
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引用次数: 1
Roof slope effects on the aerodynamic characteristics of tall buildings 屋顶坡度对高层建筑气动特性的影响
IF 0.4 Q3 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2021-01-01 DOI: 10.30765/ER.1481
I. Boumrar, A. Becheur
Roof shape of a building placed in a wind flow has particularly significant effects on this flow, in its wake, immediately at the vicinity and far from the structure. This influence is given by an experimental study, undertaken on rectangular models of reduced scale skyscrapers (1:1000), in a subsonic wind tunnel that enabled us to measure the exerted force by wind flow on windward face of the buildings, as well as the pressure distribution according to the longitudinal and the transverse building directions. The drag force acting on the models windward face is very affected by the building slope roof; these results are available for a normal and inclined wind direction. A numerical simulation is carried out to reproduce complex flow developed around the different building models, using Fluent software. We obtain the parietal pressure distribution on the various building faces and we compare the numerical values to the experimental data obtained in the wind tunnel, both are in good agreement with those provided by the international ASCE code. The numerical simulation indicates that complex structure vortices are developed at the buildings wake and allows us a better understanding of the flow phenomena. Analysis of the numerical results reveals a distinct evolution of pressure and velocity fields, the induced downstream flow is particularly complex. The presence of a roof deforms swirling zones: the zone of recirculation in buildings wake is stretched and the flow diagram is modified, which has direct effects on the measured wind force and the pressure distribution.
处于风中的建筑物的屋顶形状对风的尾流、附近和远离建筑物的气流有特别显著的影响。在亚音速风洞中,对缩小比例的摩天大楼矩形模型(1:1000)进行了实验研究,得出了这种影响,使我们能够测量风对建筑物迎风面施加的力,以及根据建筑物纵向和横向方向的压力分布。作用在模型迎风面上的阻力受建筑物坡屋顶的影响较大;这些结果适用于正常风向和倾斜风向。利用Fluent软件进行数值模拟,再现围绕不同建筑模型开发的复杂流程。计算得到了建筑物各面顶压分布,并与风洞试验数据进行了比较,结果与国际ASCE规范的计算结果吻合较好。数值模拟结果表明,在建筑物尾迹处形成了复杂的结构涡,使我们对流动现象有了更好的认识。数值分析结果表明,压力场和速度场的演化特征明显,诱导的下游流动尤为复杂。屋顶的存在使旋流区发生变形:建筑物尾流的再循环区被拉长,流线图被修改,这对测量的风力和压力分布有直接影响。
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引用次数: 1
期刊
Engineering Review
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