American Journal of Engineering and Applied Sciences最新文献_第2页

Improvement of Rooftop Solar Panels Efficiency using Maximum Power Point Tracking Based on an Adaptive Neural Network Fuzzy Inference System 基于自适应神经网络模糊推理系统的最大功率点跟踪提高屋顶太阳能板效率

American Journal of Engineering and Applied Sciences Pub Date : 2023-01-01 DOI: 10.3844/ajeassp.2023.1.11

I. Made, Ari Nrartha, I. M. Ginarsa, A. B. Muljono, Sultan, Ida Ayu, Sri Adnyani, M. Bilad, M. Abid

引用次数: 0

The Study of the Dynamics of a Basic DoF Robot 基本自由度机器人的动力学研究

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.302.314

Relly Victoria Virgil Petrescu

引用次数: 0

Data Analytics for the Cyber Security of an Information System Based on a Markov Decision Process Model 基于马尔可夫决策过程模型的信息系统网络安全数据分析

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.288.294

Lidong Wang, Randy Jones, T. Falls

引用次数: 0

A Secure Unicast/Multicast Authentication and Key Distribution Protocols for Smart Grid 一种安全的智能电网单播/组播认证和密钥分发协议

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.331.343

Samah Mohamed Sayed, H. Aslan, Ayman M. Hassan

引用次数: 0

Low Reynolds Number Wing Design for Unmanned Aerial Vehicle: A Case Study 无人机低雷诺数机翼设计:一个案例研究

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.264.273

M. El-Adawy, Alhassan H. Farid, Mohamed Ahmed Hassan, M. Abady, Donia Medhat, Habiba Abdullatif, Omar Hassan, Salaheldin Mohamed Thabet

引用次数: 0

Universal Singular Optimal Control: Affine Systems 通用奇异最优控制:仿射系统

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.294.301

Andrés Gabriel García, Juan Andr'es Roteta Lannes

{"title":"Universal Singular Optimal Control: Affine Systems","authors":"Andrés Gabriel García, Juan Andr'es Roteta Lannes","doi":"10.3844/ajeassp.2022.294.301","DOIUrl":"https://doi.org/10.3844/ajeassp.2022.294.301","url":null,"abstract":": In this study, the problem of finding an optimal controller for nonlinear systems with one input and a reference tracking signal is approached. With the problem's formulation, any desired signal can be tracked instantly with a closed-loop controller without the need for integral terms. Presentation lies at the heart of optimal control. This study, however, does not consider the integral term, allowing tracking and stability to occur naturally. It has a broad scope with a wide range of applications, namely when dealing with affine nonlinear systems, which provide geometric control unification with asymptotic stability in some cases. A common scenario that comes from optimal control involves the minimization of integral cost functionals. Issues like asymptotic stability or even tracking to the desired reference signal have always been the main limitations. In this study, the main theorem allows the solution of optimal control problems with no-integral terms, in other words tracking problems with input/state constraints, providing closed-loop controllers. A DC motor with a pendulum in upright position is an example of an application for which singular optimal control is tested in this study. The results confirm both asymptotic stability and optimal tracking with an accuracy of 95%. The main contributions of this study include an optimal closed-loop controller with no mixed initial/final conditions, input/state constraints, asymptotic stability guarantee, a strong connection with geometric tools and finally the possibility to generalize to systems with multiple inputs. As a conclusion, general nonlinear control systems can be included in the optimal control methodology presented in this study including input/state constraints. Due to the lack of integral terms, the problem can be solved in closed form by using an optimal closed-loop controller .","PeriodicalId":7425,"journal":{"name":"American Journal of Engineering and Applied Sciences","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86154098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bio-Inspired Materials: Exhibited Characteristics and Integration Degree in Bio-Printing Operations 仿生材料:在生物打印操作中表现出的特性和集成程度

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.255.263

Antreas Kantaros

{"title":"Bio-Inspired Materials: Exhibited Characteristics and Integration Degree in Bio-Printing Operations","authors":"Antreas Kantaros","doi":"10.3844/ajeassp.2022.255.263","DOIUrl":"https://doi.org/10.3844/ajeassp.2022.255.263","url":null,"abstract":": In the last decade, additive manufacturing techniques, commonly known under the term \"3d printing\" have seen constantly increasing use in various scientific fields. The nature of these fabrication techniques that operate under a layer-by-layer material deposition principle features several de facto advantages, compared to traditional manufacturing techniques. These advantages range from the precise attribution of pre-designed complex shapes to the use of a variety of materials as raw materials in the process. However, its major strong point is the ability to fabricate custom shapes with interconnected lattices, and porous interiors that traditional manufacturing techniques cannot properly attribute. This potential is being largely exploited in the biomedical field in sectors like bio-printing, where such structures are being used for direct implantation into the human body. To meet the strict requirements that such procedures dictate, the fabricated items need to be made out of biomaterials exhibiting properties like biocompatibility, bioresorbability, biodegradability, and appropriate mechanical properties. This review aims not only to list the most important biomaterials used in these techniques but also to bring up their pros and cons in meeting the aforementioned characteristics that are vital in their use.","PeriodicalId":7425,"journal":{"name":"American Journal of Engineering and Applied Sciences","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72777471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

The Study of the Dynamics of a Cebâşev Manipulator ceb<s:1> <e:1> ev机械臂动力学研究

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.239.254

R. Petrescu

引用次数: 0

Uncrewed Ground Vehicles (UGVs) and Nature-Inspired Designed Robot DIGIT and SPOT: A Review 无人驾驶地面车辆(ugv)与自然启发设计的机器人DIGIT和SPOT:综述

American Journal of Engineering and Applied Sciences Pub Date : 2022-04-01 DOI: 10.3844/ajeassp.2022.274.287

M. Muktadir, Sun Yi, S. Hamoush, Selorm Garfo, Sai Charan Dekkata, Xingguang Li, Amanuel Abrdo Tereda, Richard McKee, Kamar Brown, Normal Klawah

引用次数: 1

Singularity Analysis of a Hybrid Serial-Cable Driven Planar Robot 串行-电缆混合驱动平面机器人奇异性分析

American Journal of Engineering and Applied Sciences Pub Date : 2022-03-01 DOI: 10.3844/ajeassp.2022.197.208

S. Lahouar, L. Romdhane

{"title":"Singularity Analysis of a Hybrid Serial-Cable Driven Planar Robot","authors":"S. Lahouar, L. Romdhane","doi":"10.3844/ajeassp.2022.197.208","DOIUrl":"https://doi.org/10.3844/ajeassp.2022.197.208","url":null,"abstract":": In this study, we address the problem of singularities of a hybrid serial-cable driven planar robot. Based on an analytical kinetostatic analysis three types of singularities are determined, i.e., serial, parallel, and combined singularities. In addition, cable tensions should be positive, otherwise, the robot will be uncontrollable. The serial singularity corresponds to positions where the serial port of the robot is fully extended or fully folded. The parallel singularity corresponds to aligned cables and combined singularities correspond to both cases. Cable tensions distribution, within the workspace, is determined, which allowed the identification of regions where the cable tensions exceed an allowable value. The influence of physical parameters on the workspace of the robot and its singular configurations is also studied. An example of a gait rehabilitation system using this type of robot is shown. Based on the kinetostatic analysis, multi-objective optimization of the dexterity and the cable tensions is performed, which yielded solutions represented by a Pareto front. The results have been extended to the case of 3 degrees of freedom hybrid robot.","PeriodicalId":7425,"journal":{"name":"American Journal of Engineering and Applied Sciences","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87914069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0