FME Transactions最新文献_第7页

A contact stress capacity model for cylindrical wormsets 圆柱虫集接触应力能力模型

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201001o

E. Osakue, Lucky Anetor

{"title":"A contact stress capacity model for cylindrical wormsets","authors":"E. Osakue, Lucky Anetor","doi":"10.5937/fme2201001o","DOIUrl":"https://doi.org/10.5937/fme2201001o","url":null,"abstract":"A contact stress capacity expression is derived for cylindrical worm sets by considering the worm as a helical rack mating with a helical gear. The concept of the equivalent spur gear for a helical gear defined by the instantaneous radius of curvature in the virtual plane of the helical gear is utilized in the contact stress capacity model formulation. All the basic design parameters of worm and gear are incorporated in the expression which explicitly shows the influence of the base and nominal helix angles on the contact stress. By considering the geometry of the worm and gear in engagement, active gear face width and active threaded length of the worm are defined and used to estimate load sharing among gear teeth. This allows the interaction of motion and forces in wormset meshes to be captured by a semi-empirical factor, an aspect not previously considered. The new model also accounts for multiple threaded worms which seem not to have been treated till now. The service load factor expression for cylindrical gears is modified for wormsets to take account of different worm thread profile designs and mesh friction. Four illustrative examples of contact stress computations are carried out using the new contact stress capacity model for wormset designs from different references. The contact stress estimates from the new model are compared with previous solution values. The estimated percentage variances between the previous and new model values are within the range of -4.5% to 0.3%. These variances indicate excellent to a very favorable comparison that should inspire some confidence in using the new model for preliminary design tasks of cylindrical wormsets.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"48 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89812229","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

Early environmental assessment of products using behavior models and the impact of their inaccuracy on environmental product performance 使用行为模型对产品进行早期环境评估及其不准确性对环境产品性能的影响

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2204715b

Houda Bouyarmane, Amine El, M. Sallaou

{"title":"Early environmental assessment of products using behavior models and the impact of their inaccuracy on environmental product performance","authors":"Houda Bouyarmane, Amine El, M. Sallaou","doi":"10.5937/fme2204715b","DOIUrl":"https://doi.org/10.5937/fme2204715b","url":null,"abstract":"The decisions made during the preliminary design phases considerably impact the development of a product's lifecycle, acting on its environmental performance, cost, and duration of its realization. However, the lack of relevant information during these phases does not allow for the accurate evaluation of design solutions. In addition, it generates schedule delays and overruns in the budget allocated to developing a given solution. In this perspective, the present work aims to assess the accuracy of the behavior models used for exploring solutions during the embodiment phase. This was based on two measures of different nature, namely objective accuracy, which is evaluated by referring to real prototyping of a given solution, and the subjective accuracy measure, which allows to the expression of the degradation of the first measure in relation to the reference point. This combination will lead to a measure that can be generalized on all the design space. In a second step, the current work suggests an estimation of the effect of these models' accuracy on the proposed solutions' environmental impact. To this end, a sensitivity study was carried out on the input data of the model (design parameters) in order to deduce the effect of the results obtained (performance parameters) on the mass and, consequently, the environmental impact of the solution. In order to highlight the approach adopted in the present study, it was applied to a real industrial case, ultimately leading to the most optimized solution in terms of accuracy and environmental impact.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"118 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77407082","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

Adaptation of the simulated evolution algorithm for wind farm layout optimization 模拟进化算法在风电场布局优化中的应用

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2204664k

Salman A. Khan

{"title":"Adaptation of the simulated evolution algorithm for wind farm layout optimization","authors":"Salman A. Khan","doi":"10.5937/fme2204664k","DOIUrl":"https://doi.org/10.5937/fme2204664k","url":null,"abstract":"Wind energy is a potential replacement for traditional, fossil-fuel-based power generation sources. One important factor in the process of wind energy generation is to design of the optimal layout of a wind farm to harness maximum energy. This layout optimization is a complex, NP-hard optimization problem. Due to the sheer complexity of this layout design, intelligent algorithms, such as the ones from the domain of natural computing, are required. One such effective algorithm is the simulated evolution (SE) algorithm. This paper presents a simulated evolution algorithm engineered to solve the wind farm layout design (WFLD)optimization problem. In contrast to many non-deterministic algorithms, such as genetic algorithms and particle swarm optimization which operate on a population, the SE algorithm operates on a single solution, decreasing the computational time. Furthermore, the SE algorithm has only one parameter to tune as opposed to many algorithms that require tuning multiple parameters. A preliminary empirical study is done using data collected from a potential location in the northern region of Saudi Arabia. Experiments are carried out on a 10 × 10 grid with 15 and 20 turbines while considering turbines with a rated capacity of 1.5 MW. Results indicate that a simulated evolution algorithm is a viable option for the said problem.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"44 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73788407","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

Multi-point tool condition monitoring system: A comparative study 多点刀具状态监测系统的比较研究

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201193k

K. Pradeep, V. Muralidharan, Hameed Shaul

引用次数: 1

Design of a robust controller for a gearboxconnected two-mass system based on a hybrid model 基于混合模型的齿轮箱连接双质量系统鲁棒控制器设计

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201079m

A. Mohammed, Shibly A. Al-Samarraie, Alaa Abdulhady Jaber

{"title":"Design of a robust controller for a gearboxconnected two-mass system based on a hybrid model","authors":"A. Mohammed, Shibly A. Al-Samarraie, Alaa Abdulhady Jaber","doi":"10.5937/fme2201079m","DOIUrl":"https://doi.org/10.5937/fme2201079m","url":null,"abstract":"Backlash is a common nonlinear phenomenon in mechanical systems, producing undesired behavior such as inaccuracies and oscillations. Instability thereby may limit the speed and position in industrial robots, automotive, and other applications. In this paper, a two-mass system connected by a gearbox is modeled as a hybrid system based on a two modes approach. First, the size of the backlash gap is assumed known; thus, when the motor and load are in negative or positive-contact, the system becomes an equivalent system (rigid body) and can be modeled as one degree of freedom, which is described as a second-order system, this mode is called Contact Mode. Second, when the motor reverses its direction, the system behaves as two separated subsystems so that each subsystem can be modeled as one degree of freedom; this mode is called Backlash Mode. A sliding mode controller (SMC) has been proposed for the above two modes in this work. Hence, two sliding mode controllers are designed, one for the contact mode to achieve tracking position performance, while the other is for the backlash mode to achieve stability. Finally, the two controllers are connected by designing a switching control mode based on the gap conditions and size. The proposed control system is tested considering two different desired references. The simulation result proved the ability and robustness of the designed SMC controllers to force the load position to track the desired reference position and overcome the nonlinearities and drawbacks of SMC, such as chattering.","PeriodicalId":12218,"journal":{"name":"FME Transactions","volume":"90 33 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77951301","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

Low cycle fatigue properties of extruded magnesium AZ31B 挤压AZ31B镁合金的低周疲劳性能

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2203422s

I. Sukmana, Fauzi Ibrahim, M. Badaruddin, Hadi Nur

引用次数: 0

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

Throat length effect on the flow patterns in off-design conical nozzles 喉道长度对非设计锥形喷嘴流型的影响

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201271t

San Tolentilo, Jorge Mírez

引用次数: 2

Sensorless position estimating and transition time identifying for the spool of a high speed on/off solenoid valve 高速开关电磁阀阀芯无传感器位置估计和过渡时间识别

IF 1.6

FME Transactions Pub Date : 2022-01-01 DOI: 10.5937/fme2201099a

A. Aborobaa, K. Ghamry, A. Saleh, M. Mabrouk

引用次数: 2