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Best operation strategies for piezoelectric vibration energy harvesters. I. Theory 压电振动能量收集器的最佳运行策略。I. 理论
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.171
V. Badescu
This paper is the first part of a three-part series. A general scheme of controlling the operation of piezoelectric vibration energy harvesters is proposed. It covers schemes proposed in literature as particular cases. The focus is on base-excited vibration energy harvesters.
本文是三部分系列论文的第一部分。本文提出了控制压电振动能量收集器运行的一般方案。它涵盖了文献中作为特例提出的方案。重点是基激振动能量收集器。
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引用次数: 0
The most important source of inspiration for artificial gripping systems are natural gripping systems 人工抓取系统最重要的灵感来源是自然抓取系统
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.139
I. Starețu
The main role of a gripping biosystem is to grasp-grip a body-object, which can then be transferred from one place to another. Gripping biosystems can be very simple, like two areas of soft biological tissue that can grasp a body nearby, such as the extremities of the elephant's trunk, but also very complex as the human hand, considered the best gripping biosystem. Some gripping biosystems are adaptated to increase the safety of the grip such as the octopus arm which is provided with suction cups to compensate for the reduced friction in the aquatic environment. The paper first classifies biogrippers according to the grasp-grip method through which we distinguish gripping: by grasp, shellfish-like claws, beak, claws, jaws and fingers. Suggestive examples are given for each case, and in some cases even artificial variants that were more or less inspired by natural biogrippers considered as models. The few details of the mathematical modeling of the human hand grip can be extrapolated to all existing biogrippers that can be identified. The paper tries for the first time an exhaustive presentation of biogrippers in order to stimulate their in-depth study and to use as many of the natural gripping solutions and some of their features to optimize the artificial grippers used especially in robots.
抓取生物系统的主要作用是抓取物体,然后将其从一个地方转移到另一个地方。抓取生物系统可以非常简单,如大象躯干的四肢等两个可以抓取附近物体的软生物组织区域,也可以非常复杂,如被认为是最佳抓取生物系统的人手。有些抓取生物系统经过调整,以提高抓取的安全性,例如章鱼的手臂上有吸盘,以补偿水生环境中摩擦力的降低。本文首先根据抓取-抓取方法对生物抓取器进行了分类,通过这种方法我们可以区分抓取方式:抓取、贝类爪、喙、爪、颚和手指。每种情况下都给出了建议性的例子,在某些情况下,甚至还给出了或多或少受到天然生物抓取器启发的人工变体作为模型。人类手部抓握数学模型的一些细节可以推断出所有可以识别的现有生物抓握器。本文首次对生物抓手进行了详尽的介绍,以促进对生物抓手的深入研究,并尽可能多地利用自然抓手的解决方案及其部分特征来优化人工抓手,尤其是在机器人中使用的人工抓手。
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引用次数: 0
Analysis of truck braking using multiple simulations 利用多重模拟分析卡车制动
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.207
M. Popa, Nicolae Burnete, D. Capătă, B. Jurchiş
In the field of road vehicles, the merging of mechanical assemblies and electronic computing architecture has become indispensable. In the present paper, a thorough study of the braking performance of heavy goods vehicles is presented. Operating conditions and other influencing factors during use create multiple combinations that influence the behavior and performance of braking systems in different ways. However, for such a speed of development, the dedicated means of research become insufficient, thus new study methods are needed to guarantee complex results with a minimum of consumed resources. Such a variant of the study is also addressed in this paper, where the results are obtained based on multiple simulations, carried out simultaneously, but in a much shorter time than in the experimental cases and with a large volume of data.
在公路车辆领域,机械组件与电子计算机结构的融合已变得不可或缺。本文对重型货运车辆的制动性能进行了深入研究。在使用过程中,操作条件和其他影响因素会产生多种组合,以不同的方式影响制动系统的行为和性能。然而,面对如此快的发展速度,专门的研究手段已显不足,因此需要新的研究方法来保证在消耗最少资源的情况下获得复杂的结果。本文也讨论了这种研究方法的变体,其结果是基于同时进行的多次模拟得出的,但与实验情况相比,模拟时间更短,数据量更大。
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引用次数: 0
The efficiency of the horizontal directional drilling method in the rehabilitation and modernization projects of the underground infrastructure 水平定向钻探法在地下基础设施修复和现代化项目中的效率
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.219
VALENTIN-PAUL Tudorache, N. Antonescu
"The evolution of human society was and is dependent on natural resources (oil, natural gas, coal, ores, industrial water, drinking water, etc.) and, obviously, on their transportation through pipelines. The existence of resources in the earth's crust, at depths not always accessible, required the finding of methods for their exploration and exploitation. Consequently, in the last 30 years, drilling methods, techniques and technologies have been developed. Today, the Horizontal Directional Drilling method covers the entire geological spectrum, and in terms of rehabilitation and modernization projects of the underground infrastructure, it ensures high quality. Therefore, Horizontal Directional Drilling is the smart, clean and efficient solution for installing the network sections to be installed. The authors, under the auspices of the Romanian Academy of Technical Sciences (ASTR) and the General Association of Romanian Engineers (AGIR), in this paper, highlight the use and advantages of Horizontal Directional Drilling. The main objective is to install such services in Romania without using traditional trenching methods, helping to avoid any unnecessary impact on the environment and, evidently, offering extra security. "
"人类社会的发展过去和现在都依赖于自然资源(石油、天然气、煤炭、矿石、工业用水、饮用水等),显然也依赖于通过管道运输这些资源。地壳中存在的资源,其深度并不总是可以到达的,这就要求找到勘探和开采这些资源的方法。因此,在过去的 30 年中,钻探方法、技术和工艺得到了发展。如今,水平定向钻探方法覆盖了整个地质范围,在地下基础设施的修复和现代化项目中,它确保了高质量。因此,水平定向钻是安装待安装网络部分的智能、清洁和高效的解决方案。本文作者在罗马尼亚技术科学院(ASTR)和罗马尼亚工程师总协会(AGIR)的支持下,重点介绍了水平定向钻的用途和优势。主要目的是在罗马尼亚安装此类服务,而无需使用传统的开挖方法,从而有助于避免对环境造成不必要的影响,而且显然还能提供额外的安全性。"
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引用次数: 0
Experimental evaluation of the treadmill speed and incline effects on the ankle kinematics in healthy subjects 跑步机速度和坡度对健康受试者踝关节运动学影响的实验评估
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.125
Daniela Tarniță, A. Petcu, Gabriela Marinache, Dan Marghitu
This paper presents the results obtained in the experimental evaluation of flexion–extension angles of the ankle joints during 10 tests of walking on horizontal and inclined treadmill. The tests were performed at two different speeds, 5 km/h and 10 km/h, and five different incline angles: 0, 3, 7, 11 and 15 degrees by a sample of 11 healthy subjects. The medium cycles are determined and plotted for all subjects and for the sample, for all experimental tests. The medium cycle was calculated for each test, for each subject, and for the entire sample. A comparison is made between the average cycles of each test obtained for the sample. Increasing the TM inclination leads to an increase in the maximum value of the flex-ext angle. The influence of increasing the TM inclination angle on the variation of the flex-ext angle is stronger than that of increasing the walking speed.
本文介绍了在水平和倾斜跑步机上进行的 10 次步行测试中对踝关节屈伸角度的实验评估结果。测试由 11 名健康受试者以 5 公里/小时和 10 公里/小时两种不同速度和 0、3、7、11 和 15 度五种不同倾斜角度进行。在所有实验测试中,所有受试者和样本的中等周期均已确定并绘制成图。每次测试、每个受试者和整个样本的中等周期都经过计算。对样本每次测试的平均周期进行了比较。增加 TM 倾角会导致挠伸角最大值的增加。增加舵机倾角对屈伸角度变化的影响比增加行走速度的影响更大。
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引用次数: 0
Functional principles of the envelope characterized by the variable thermal resistance of the wall as a result of parietodynamic exhaust effect (PDE) 围护结构的功能原理,其特点是由于顶动力排气效应(PDE)导致墙体热阻可变
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.187
Dan Constantinescu, H. Petran, Cristian Petcu
The paper presents the opaque envelope system in the endowment of inhabited buildings characterized by the use of the heat of the air discharged from the inhabited spaces, circulated through the space adjacent to the living environment / outdoor environment in order to reduce the need for heat / sensitive cold of the inhabited spaces (PDE). It is presented mathematical modeling of the processes of heat transfer and flow of indoor / outdoor air circulated through parallel vertical channels. The dimensions of vertical channel opening and air flows are based on the solutions of the property transfer equations associated with Model 1 (forced laminar flow) and Model 2 (globally representative model of both laminar flow and turbulent flow). Model 2 includes both laminar flow (space heating in cold season and cooling spaces in summer season hours with sun) and turbulent flow (cooling living spaces in summer season, hours of night – free cooling). A case study and the interpretation of the results obtained regarding the energy performance of the living space in relation to similar results associated with the conventional envelope is presented.
本文介绍了有人居住建筑的不透明围护系统,其特点是利用居住空间排出的空气热量,通过与居住环境/室外环境相邻的空间进行循环,以减少居住空间对热量/冷量的需求(PDE)。本文介绍了通过平行垂直通道循环的室内/室外空气的传热和流动过程的数学模型。垂直通道开口和气流的尺寸是基于模型 1(强制层流)和模型 2(层流和湍流的全局代表模型)相关的属性传递方程的解决方案。模型 2 包括层流(寒冷季节的空间供暖和夏季有太阳时的空间制冷)和湍流(夏季居住空间的制冷和夜间的自由制冷)。本文介绍了一个案例研究,并对所获得的居住空间能源性能结果与传统围护结构的类似结果进行了解释。
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引用次数: 0
Modal screening of vibrating systems with local modes 具有局部模态的振动系统的模态筛选
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.113
Mircea Radeș
This paper reports experience in using several Mode Indicator Functions for structures with local higher modes and heavy damping. The failure to locate all the modes of vibration for heavily damped structures is emphasized using a 15 degrees of freedom lumped parameter system.
本文报告了对具有局部较高模态和重阻尼的结构使用几种模态指示函数的经验。文中强调了使用 15 自由度总成参数系统无法定位重阻尼结构的所有振动模式的问题。
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引用次数: 0
Coating of a lignin-based polymer with ceramic micropowders 用陶瓷微粉涂覆木质素基聚合物
Pub Date : 2023-06-26 DOI: 10.56958/jesi.2023.8.2.101
Alina Marguta, S. Mazurchevici, D. Nedelcu
This paper examines the behavior of Arboblend V2 Nature biopolymer samples coated with three distinct ceramic powders: Amdry 6420 (Cr2O3), Metco 143 (ZrO2 18TiO2 10Y2O3), and Metco 136F (Cr2O3-xSiO2-yTiO2). Atmospheric Plasma Spray (APS) method were used to deposit the coating onto the polymeric substrate, which was obtained by injection molding. Several characteristics of the coated samples, as thermal behavior, roughness, as well as structural and morphological aspects, were evaluated during the investigation. The surface analysis of the samples demonstrated a uniform deposition for the ZrO2 18TiO3 10Y2O3 layer, but a less uniform deposition for the coatings containing ceramic micro-particles of chromium (III) oxides. The thermal research revealed the material's structural resilience. Regarding Atomic Force Microscopy examination, it highlighted the roughness of the coated surfaces and also the good adhesion of the microparticles on the biopolymer substrate.
本文研究了涂有三种不同陶瓷粉末的 Arboblend V2 Nature 生物聚合物样品的行为:Amdry 6420(Cr2O3)、Metco 143(ZrO2 18TiO2 10Y2O3)和 Metco 136F(Cr2O3-xSiO2-yTiO2)。采用大气等离子喷涂(APS)方法将涂层沉积到通过注塑成型获得的聚合物基底上。在研究过程中,对涂层样品的热行为、粗糙度以及结构和形态方面的一些特性进行了评估。样品的表面分析表明,ZrO2 18TiO3 10Y2O3 层的沉积均匀,而含有铬(III)氧化物陶瓷微粒的涂层的沉积则不太均匀。热研究显示了材料的结构弹性。原子力显微镜检查突出显示了涂层表面的粗糙度以及微颗粒在生物聚合物基底上的良好附着力。
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引用次数: 0
Fearless design on the gas leak (fire suppression and smart alert system) 天然气泄漏的无畏设计(灭火和智能警报系统)
Pub Date : 2022-12-20 DOI: 10.56958/jesi.2022.7.4.485
H. Hasbullah, L. Rachman
The purpose of this research is to design an automatic leak detection and fire extinguishing system called FEARLESS. The method used is a case study methodology and applied. From the data obtained in the field, it was found that there were 4 gas detector disturbances in 2019 and 5 times in 2020 which resulted in no detection of gas leaks when the detector was disturbed, as well as 34 gas leaks in 2019 and 42 times in 2020. From this data, it is used as a reference in designing the FEARLESS (FIRE SUPRESSION AND SMART ALERT SYSTEM) to detect gas leaks. The application of the FEARLESS system can be drawn several conclusions, including applying the FEARLESS system can reduce the failure or damage that occurs so as to minimize the occurrence of undetected gas leaks. The FEARLESS system can be combined with two or more detectors to be implemented for various needs.
本研究的目的是设计一种称为FEARLESS的自动泄漏检测和灭火系统。所使用的方法是一种案例研究方法并加以应用。根据现场获得的数据,发现2019年和2020年分别发生了4次和5次气体探测器干扰,导致探测器受到干扰时未检测到气体泄漏,2019年和2019年分别发生34次和42次气体泄漏。根据这些数据,它可作为设计无障碍(灭火和智能警报系统)检测气体泄漏的参考。无FEARLESS系统的应用可以得出几个结论,包括应用无FEARESS系统可以减少发生的故障或损坏,从而最大限度地减少未检测到的气体泄漏的发生。FEARLESS系统可以与两个或多个检测器相结合,以满足各种需要。
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引用次数: 0
Thermal rehabilitation of residential buildings or efficiency vs effectiveness in envelope of existing buildings 住宅建筑物的热修复或现有建筑物围护结构的效率与效益
Pub Date : 2022-12-20 DOI: 10.56958/jesi.2022.7.4.447
A. Dabija
"Starting from the definition of the terms, efficiency generally refers to the management of resources in order to achieve a goal, while effectiveness represents the ability / effective quantification of the achievement of a goal. In other words, efficiency is a process while effectiveness is an outcome. Having said that, the question rises (rhetorical, after all): was the process of thermal rehabilitation of the residential building stock efficient? Was it effective? Efficient it probably was: with the resources at the disposal of the town halls, with funds attracted and with the contribution of owners' associations (when the situation demanded their participation), a huge number of residential buildings were covered in thermal-insulating blankets. Was the expected result achieved? In other words, was it effective? The question may have many answers, considering the angles, the nuances and perspectives from where the intervention is evaluated, from the very basis of the approach – the hypothesis and the concept - to the architecture of the buildings and their relationship with the urban space of which they are a part. The paper proposes a critical analysis of the results of the approach to the thermal “wrapping” of residential buildings in Romania as well as in the European research and practice."
从术语的定义出发,效率一般是指为了实现目标而对资源的管理,而有效性则是指实现目标的能力/有效量化。换句话说,效率是一个过程,而效果是一个结果。话虽如此,问题来了(毕竟是修辞上的):住宅建筑存量的热修复过程是否有效?它有效吗?它可能是有效的:有了市政厅可以支配的资源,有了吸引来的资金和业主协会的贡献(当情况需要他们参与时),大量的住宅建筑被隔热毯覆盖。是否达到了预期的结果?换句话说,它是否有效?这个问题可能有很多答案,考虑到评估干预的角度、细微差别和视角,从方法的基础——假设和概念——到建筑物的结构及其与城市空间的关系。本文对罗马尼亚住宅建筑热“包裹”方法的结果以及欧洲的研究和实践进行了批判性分析。
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引用次数: 0
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Journal of Engineering Sciences and Innovation
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