FME Transactions最新文献_第8页

Aeroelastic analysis of straight-bladed vertical axis wind turbine blade 直叶片垂直轴风力机叶片气动弹性分析

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2203512f

A. Fadlalla, A. Sahin, H. Ouakad, H. Bahaidarah

引用次数: 0

Adaptive model Predictive control for a magnetic suspension system under initial position dispersions and voltage disturbances 初始位置色散和电压扰动下磁悬浮系统的自适应模型预测控制

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201211a

Fawaz F. Al-Bakri, Salwan Kafaji, H. Ali

{"title":"Adaptive model Predictive control for a magnetic suspension system under initial position dispersions and voltage disturbances","authors":"Fawaz F. Al-Bakri, Salwan Kafaji, H. Ali","doi":"10.5937/fme2201211a","DOIUrl":"https://doi.org/10.5937/fme2201211a","url":null,"abstract":"A nonlinear magnetic suspension system consisting of a mechanical motion and electromagnetic circuit is considered in this paper. An online algorithm that is used to stabilize the suspended mass targeting the desired ball position, ball velocity and coil current is presented. A steady-state condition, in which the ball position, the ball velocity, and the coil current were assumed constant, was used as a reference trajectory for the closed-loop simulations. An adaptive model predictive control method was employed to control the coil voltage while the discrete plant model and operating conditions were changed at each time step. The effectiveness of the proposed control law was validated in the presence of disturbances in initial ball position, steady-state ball position, suspended mass, and voltage using the Monte-Carlo simulation method. The sinusoidal, step, and impulse voltage disturbances were applied consequently to the system while imposing random dispersions of the initial ball position. Numerical results with five hundred trials illustrated that the designed algorithm can stabilize the system and track the desired reference without exceeding the state and input constraints despite the wide range of dispersions in initial ball position, steady-state ball position, suspended mass, and input voltage disturbances.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"82 10 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88037932","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: 1

Modelling the surface roughness of steel after laser hardening by using 2D visibility network, convolutional neural networks and genetic programming 利用二维可见性网络、卷积神经网络和遗传规划对激光硬化后钢材表面粗糙度进行建模

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2203393b

M. Babič, P. Wangyao, B. Ster, D. Marinković, C. Fragassa

引用次数: 0

Nonlinear free vibration analysis of non-uniform axially graded beam on variable elastic foundation 变弹性基础上非均匀轴向梯度梁的非线性自由振动分析

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2204643l

H. Lohar, A. Mitra

{"title":"Nonlinear free vibration analysis of non-uniform axially graded beam on variable elastic foundation","authors":"H. Lohar, A. Mitra","doi":"10.5937/fme2204643l","DOIUrl":"https://doi.org/10.5937/fme2204643l","url":null,"abstract":"The present work investigates the nonlinear free vibration of an axially functionally graded (AFG) beam supported on the variable foundation. The beam geometry is non-uniform, with a linear cross-section variation along the length. The beam material is graded along the axial direction following the power-law relation. A Winkler type of variable elastic foundation is taken, in which variation of stiffness is considered along the length of the foundation. Geometrical nonlinearity produced by the beam's large-amplitude deflection is also considered. To attain the desired objectives, the problem is divided into two parts. The static problem is solved first, then a subsequent free vibration analysis is executed on the statically deformed beam configuration. The governing differential equations of the system are derived using suitable energy methods. A numerical technique of direct substitution with relaxation is utilized to obtain the solution of the derived nonlinear differential equations. A suitable validation study is presented to ensure the appropriateness of the present methodology. Benchmark results are also presented by means of natural frequency, backbone curve, and mode shape plot to investigate the influences of elastic foundation, material gradation, and non-uniform geometry on nonlinear vibration.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"27 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80148328","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: 2

Quality of service management in automotive service stations 汽车服务站的服务质量管理

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201131v

D. Velimirović, C. Duboka, M. Velimirović

引用次数: 1

Application of Paris' law under variable loading 变载荷条件下帕里斯定律的应用

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201072b

S. Bulatović, V. Aleksić, L. Milović, Bojana Zečević

引用次数: 3

Design and development of robot arm system for classification and sorting using machine vision 基于机器视觉的分类分拣机械臂系统的设计与开发

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201181c

V. Cong, L. Hanh, L. Phuong, D. Duy

{"title":"Design and development of robot arm system for classification and sorting using machine vision","authors":"V. Cong, L. Hanh, L. Phuong, D. Duy","doi":"10.5937/fme2201181c","DOIUrl":"https://doi.org/10.5937/fme2201181c","url":null,"abstract":"The main focus of this paper is to design and develop a system of two robot arms for classifying and sorting objects based on shape and size using machine vision. The system uses a low-cost and high-performance hierarchical control system including one master and two slaves. Each slave is a robot controller based on a microcontroller that receives commands from the master to control the robot arm independently. The master is an embedded computer used for image processing, kinematic calculations, and communication. A simple and efficient image processing algorithm is proposed that can be implemented in real-time, helping to shorten the time of the sorting process. The proposed method uses a series of algorithms including contour finding, border extraction, centroid algorithm, and shape threshold to recognize objects and eliminate noise. The 3D coordinates of objects are estimated just by solving a linear equation system. Movements of the robot's joints are planned to follow a trapezoidal profile with the acceleration/deceleration phase, thus helping the robots move smoothly and reduce vibration. Experimental evaluation reveals the effectiveness and accuracy of the robotic vision system in the sorting process. The system can be used in the industrial process to reduce the required time to achieve the task of the production line, leading to improve the performance of the production line.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"28 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87405100","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: 11

Flutter analysis of tapered composite fins: Analysis and experiment 锥形复合翅片颤振分析:分析与实验

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2203576d

Mirko Dinulović, B. Rašuo, Ana Slavković, G. Zajic

引用次数: 4

Spatial transportation of the beam on a bifilar fastening 双线系梁的空间移动

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2203548s

Alexander N. Stadnik, Sergii Podlesny, Svitlana Kaporovych, O. Kabatskyi

引用次数: 0

Function approximation technique (FAT)-based nonlinear control strategies for smart thin plates with cubic nonlinearities 基于函数逼近技术的三次非线性智能薄板非线性控制策略

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201168a

H. Al-Shuka, Ehab N. Abbas

{"title":"Function approximation technique (FAT)-based nonlinear control strategies for smart thin plates with cubic nonlinearities","authors":"H. Al-Shuka, Ehab N. Abbas","doi":"10.5937/fme2201168a","DOIUrl":"https://doi.org/10.5937/fme2201168a","url":null,"abstract":"The current work introduces three nonlinear control solutions for the regulation of a vibrating nonlinear plate considering model uncertainty. These solutions are feedback linearization control (FBL), virtual velocity error-based control (VVEC), and backstepping control (BSC). In the FBL control, a nonlinear control law is designed with linear closed-loop dynamics such that dynamic stability is ensured. Whereas, by the VVEC (or so-called passivity-based approach in the robotics community) the limitations of the feedback linearization are overcome. On the other side, the BSC selects virtual control variables with stabilized intermediate control laws based on Lyapunov theory. Systematic modeling for the target vibrating plate with piezo patches is described. In effect, considering the nonlinear influence makes the resulted mode shapes for the vibrating structure are highly coupled and careful control design is required. Using the Galerkin approach, the partial differential equation for the smart plate is transformed into definite ordinary differential equations; the multi-input multi-output model is established. The aforementioned control strategies are evaluated and investigated in detail. In essence, they are powerful tools for dealing with nonlinear dynamic systems, however, the VVEC could be considered superior in comparison with the FBL control and the BSC since the designed control structure does not include inertia inverse matrix and modal coordinate acceleration that could make computational problems. As a result, simulation experiments were focused on the VVEC strategy, and the latter was implemented on a simply supported thin plate structure with collocated piezo-patches. The results show the validity of the proposed control architecture.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"35 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85468905","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: 1