Scientia Iranica最新文献_第8页

Python programming predictions of Thermal Behavioral Aspects of Orange Peel and Coconut-Coir Reinforced Epoxy Composites 橙皮和椰壳增强环氧复合材料热行为方面的Python编程预测

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.60206.6665

S. Pujari, Alekya Pilla, S. Subramonian, Daniel Mandrumaka

{"title":"Python programming predictions of Thermal Behavioral Aspects of Orange Peel and Coconut-Coir Reinforced Epoxy Composites","authors":"S. Pujari, Alekya Pilla, S. Subramonian, Daniel Mandrumaka","doi":"10.24200/sci.2023.60206.6665","DOIUrl":"https://doi.org/10.24200/sci.2023.60206.6665","url":null,"abstract":"Using a hand lay-up approach, both orange peel and coconut coir fibres are used in particulate form with an epoxy matrix to create partly green biodegradable composites. The findings indicate great opportunities for employing these natural fibres. The thermal conductivity of orange peel and coconut-coir epoxy composites was measured experimentally for various volume fractions of particulate fibres. The experimental findings show that as fibre concentration increases, thermal conductivity decreases. Experimental data are compared to theoretical models to determine the change in thermal conductivity with fibre amount fraction. There was a clear correlation between the hypotheses and the actual results. Regression analysis using Python programming is also done for the prediction of the thermal properties of particulate orange peel and coconut-coir fibre composites. It is observed that coir fibre composites outperformed the orange peel, indicating that the coir fibre composite is a proper thermal insulator that can be used in many industries, like the automotive industry, buildings, and steam pipes, to reduce heat transfer and thereby save a lot of energy.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"17 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81861847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation and multi-objective optimization of FDM process parameters for mechanical strength, dimensional accuracy, and cost using a hybrid algorithm 基于混合算法的FDM工艺参数机械强度、尺寸精度和成本多目标优化实验研究

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.60960.7090

Mohammad Ali Zonoobi, Hamid Haghshenas Gorgani, Dorin Javaherneshan

{"title":"Experimental investigation and multi-objective optimization of FDM process parameters for mechanical strength, dimensional accuracy, and cost using a hybrid algorithm","authors":"Mohammad Ali Zonoobi, Hamid Haghshenas Gorgani, Dorin Javaherneshan","doi":"10.24200/sci.2023.60960.7090","DOIUrl":"https://doi.org/10.24200/sci.2023.60960.7090","url":null,"abstract":"Considering many advantages of 3D printing of polymers using Fused Deposition Modeling (FDM) technique and its service nature, achieving maximum customer satisfaction is very important. The satisfaction of each particular customer may be obtained by providing one or more different outputs of this process, which may not have the same weights. This paper concentrates on multi-objective optimization of three response variables, including tensile strength, dimensional accuracy, and production cost. Eight FDM process parameters containing orientation, layer thickness, infill density, nozzle temperature, print speed, number of shells, infill pattern, and print position have been selected. For carrying out experimental studies, specimens were designed based on Taguchi L27 and manufactured according to ASTM D368-( Ⅰ ) using Polylactic Acid (PLA). Then the signal-to-noise ratio is calculated, and the mathematical regression model of all outputs is obtained. Finally, an intuitive optimal Pareto front is presented to the customer rather than a single point. By repeating the proposed algorithm for eight other customers, the average satisfaction number of 88.56% indicates the efficiency of this method.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"150 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77422463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel stretching and folding characterization method based on geometrical and physiological traits of chaotic and intermittent tracking signals 一种基于混沌和间歇跟踪信号几何和生理特征的拉伸和折叠表征方法

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.61665.7429

F. Babazadeh, M. Ahmadi-pajouh, Seyyed MohammadReza Hashemi Golpayegani

{"title":"A novel stretching and folding characterization method based on geometrical and physiological traits of chaotic and intermittent tracking signals","authors":"F. Babazadeh, M. Ahmadi-pajouh, Seyyed MohammadReza Hashemi Golpayegani","doi":"10.24200/sci.2023.61665.7429","DOIUrl":"https://doi.org/10.24200/sci.2023.61665.7429","url":null,"abstract":"– The specification of stretching and folding properties, particularly in time series, is of substantial interest. This study is sought to perceive the relationship between stretching and folding and irregular discontinuities in hand motion trajectories during target tracking tasks. In this regard, a new method is proposed based on compiling physiological characteristics and hand motion dynamics’ geometrical traits. Thus, five tracking conditions are designed in which participants are instructed to track different target motion patterns. In these experiments, sinusoidal and trapezoidal target movements with frequencies of 0.1 and 0.3 Hz, as well as pseudo-periodic target motion created by summing two sinusoids with frequencies of 0.117 and 0.278 Hz, are used as visual targets. The results illustrate that nonuniform discontinuities are noticeable properties of the hand motion trajectory. Also, the largest Lyapunov exponent, correlation dimension, and fractal dimension corroborate that the tracking attractor is low-dimensional and chaotic. Moreover, the results are compared with the curvature-based method, and its modified version is presented by taking advantage of the proposed method. As a result, through the suggested method, stretching and folding points are well discerned regardless of discontinuities. This method can deal with the systems with intermittency in both times-and state space.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"43 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74087881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constructing a Sensitive Control Chart to Monitor Process Mean using Optimal Filter: Time-Frequency Analysis Approach 用最优滤波器构造敏感控制图监测过程均值:时频分析方法

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.61463.7321

Maryam Askari, O. Ahmadi, Younes Javid

{"title":"Constructing a Sensitive Control Chart to Monitor Process Mean using Optimal Filter: Time-Frequency Analysis Approach","authors":"Maryam Askari, O. Ahmadi, Younes Javid","doi":"10.24200/sci.2023.61463.7321","DOIUrl":"https://doi.org/10.24200/sci.2023.61463.7321","url":null,"abstract":"Control charts are one of the critical tools for process monitoring. Test statistics are computed as a function of sample means in control charts for monitoring the process mean. In this study, these functions are modeled by filters. These filters have essential properties in both time and frequency domains. In previous studies, only their properties in the time domain have been considered. Thus, the resulting filters have sub-optimal performance. This study investigates the optimal design of these filters for monitoring the process mean. The behavior of these filters is analyzed not only in the time domain but also in the frequency domain. Properties such as stability are considered in designing this filter. An optimization model is designed and solved using a Genetic Algorithm to minimize the Average Run Length. The proposed optimal filter is compared with other control charts using simulation studies. Results showed the high speed of the proposed filter in detecting shifts in the process mean. The proposed optimal filter is also used to monitor the oil price of the OPEC basket. The results showed that shifts were detected at the right time using the proposed optimal filter.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"107 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73505309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accuracy and stability of a Proposed Implicit Time Integration Method (ζ-Method) Based on a Sinusoidal Interpolation Function for Acceleration 基于正弦插值函数的隐式时间积分法(ζ-法)的精度和稳定性

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.60165.6637

Soroosh Kamali, S. Dehghan, M. Najafgholipour, M. A. Hadianfard

{"title":"Accuracy and stability of a Proposed Implicit Time Integration Method (ζ-Method) Based on a Sinusoidal Interpolation Function for Acceleration","authors":"Soroosh Kamali, S. Dehghan, M. Najafgholipour, M. A. Hadianfard","doi":"10.24200/sci.2023.60165.6637","DOIUrl":"https://doi.org/10.24200/sci.2023.60165.6637","url":null,"abstract":"In this paper, the accuracy and stability of an implicit numerical method (ζ-method) is investigated. It is shown that ζ-method presents high accuracy and efficiency for the dynamic response analysis by assuming a sinusoidal interpolation function for acceleration between two successive time steps. Assuming a sinusoidal distribution of acceleration results in similar types of equations for velocity and displacement since the integration of a sine term contains sine and cosine terms. For this method, a parameter (denoted as ζ) is used as the frequency of the sinusoidal interpolation function which significantly affects the accuracy and stability of the method. The equations and derivations are presented in detail and the best value for ζ is obtained through multi-objective optimization procedures to minimize the errors. The accuracy and stability of the method have been investigated in terms of period elongation, amplitude decay, and spectral radius. Finally, the method has been evaluated by several numerical examples (linear and nonlinear SDOF, and linear MDOF). In some examples, it was observed that the ζ-method yielded better results than other numerical methods. Moreover, an interpolated version of the method was introduced which was more accurate in comparison with similar methods with equal execution time.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"48 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80869456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A sustainable rice supply chain planning from the farm to the table: a case study 从农场到餐桌的可持续大米供应链规划:案例研究

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.59793.6429

Seyyed Aziz Seyyed Jifroudi, E. Teimoury, F. Barzinpour

{"title":"A sustainable rice supply chain planning from the farm to the table: a case study","authors":"Seyyed Aziz Seyyed Jifroudi, E. Teimoury, F. Barzinpour","doi":"10.24200/sci.2023.59793.6429","DOIUrl":"https://doi.org/10.24200/sci.2023.59793.6429","url":null,"abstract":": Agri-food supply chains include several processes, from cropping and harvesting to distribution. Integrating these processes to reduce costs and environmental impact and providing sufficient supply are the main goals of agri-food supply chain management. Rice, a so-called staple food, makes up a significant portion of the human diet worldwide. Due to the importance of rice, this paper proposes a mixed-integer linear programming model for rice supply chain design and planning that considers economic, environmental, and social dimensions. This model determines the optimal strategic and tactical decisions in the rice supply chain, including cropping pattern, supplier selection, and the location and capacity of new milling centers with parboiling technology. The model considers different rice varieties and irrigation water requirements of crops. Also, it investigates the benefits of renting as well as offering a partnership agreement to independent farmers. A case study of Iran farmlands is employed to show the applicability and advantages of the proposed model for the rice supply chain. To solve the proposed multi-objective model, the ɛ -constraint method is applied. The results indicate that opening milling centers with parboiling technology is profitable for the supply chain. Moreover, entering a partnership agreement is much more profitable than renting farmlands.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"2 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78768292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On non-stationary response of cracked thin rectangular plates acted upon by a moving random force 运动随机力作用下裂纹矩形薄板的非平稳响应

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-20 DOI: 10.24200/sci.2023.61247.7220

A. Nikkhoo, Shirin Banihashemi, K. Kiani

{"title":"On non-stationary response of cracked thin rectangular plates acted upon by a moving random force","authors":"A. Nikkhoo, Shirin Banihashemi, K. Kiani","doi":"10.24200/sci.2023.61247.7220","DOIUrl":"https://doi.org/10.24200/sci.2023.61247.7220","url":null,"abstract":"This paper is aimed to examine the dynamics of cracked thin rectangular plates subjected to a moving non-stationary random load. A random load is considered with a constant mean value, a constant moving velocity, and five different covariance patterns namely the white noise, constant, exponential, cosine wave, and exponential cosine covariance. Accordingly, an intact plate’s orthogonal polynomials in combination with the well-known corner functions are employed to explore the mechanical behavior of the cracked plate. As the non-dimensional deflection values, the functions of the squared mean values are obtained for the damped and undamped cracked plates at different points. Then an inclusive parametric study is performed to explore effects of the inclined crack angles and the crack lengths on the non-dimensional functions of squared mean values at middle point of the undamped and damped cracked plates. Based on the obtained results, there are non-monotonous nonlinear relations between increasing the incline crack angles as well as the crack lengths and the non-dimensional functions of squared mean values. Furthermore, it is found that in the exponential covariance cases, the effects of increasing crack angles and lengths on the non-dimensional squared mean values are profounder than the other four patterned covariance cases.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90666219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Concurrent Optimization of Reliability, Maintainability and Total Cost in a Job Shop Production System with Multiple Fuzzy Parameters 多模糊参数作业车间生产系统的可靠性、维修性和总成本并行优化

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-18 DOI: 10.24200/sci.2023.60313.6727

Ali Bonyadi Naeini, Hossein Gholizadeh

{"title":"Concurrent Optimization of Reliability, Maintainability and Total Cost in a Job Shop Production System with Multiple Fuzzy Parameters","authors":"Ali Bonyadi Naeini, Hossein Gholizadeh","doi":"10.24200/sci.2023.60313.6727","DOIUrl":"https://doi.org/10.24200/sci.2023.60313.6727","url":null,"abstract":"An integrated intelligent algorithm is proposed to optimize the reliability, maintainability, and total cost in the job shop production system. The algorithm consists of three basic modules of computer simulation. each comprising three phases of Algorithm, simulation, and Experiments/robustness validation. In the design phase, different scenarios are determined by changing parameters affecting the reliability, maintainability, and total cost. The job shop production system is simulated in the simulation phase. Then, a fuzzy simulation approach is implemented to run the simulation model for each scenario with ambiguous inputs. Accordingly, the investment cost, maintenance cost, mean time to repair (MTTR), and mean time to failure (MTTF) are obtained. Finally, the performance of different scenarios is assessed in the third module. ANN and DEA are separately used in this module and the preferred method is selected based on the robustness test and extensive sensitivity analysis. DEA and ANN are then employed to rank the design alternatives concerning the initial inputs and outputs. To show the applicability and superiority of the proposed integrated algorithm, it is applied to optimize the design of a fuzzy job shop production system consisting of five workstations.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"281 2-3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72493445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation of Anthropometric Measurements Using Optimized Machine Learning Models with Bayesian Algorithm 利用优化的机器学习模型和贝叶斯算法估计人体测量值

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-18 DOI: 10.24200/sci.2023.61224.7209

D. Güleryüz, Ö. Efe, Burak Efe

引用次数: 0

On the solutal and thermal Marangoni convection arising in the self-rewetting fluid flow under hydromagnetic consideration 磁作用下自润湿流体流动中溶质和热马兰戈尼对流的研究

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-18 DOI: 10.24200/sci.2023.60381.6774

V. Chaurasiya, R. Tripathi, Ramayan Singh

{"title":"On the solutal and thermal Marangoni convection arising in the self-rewetting fluid flow under hydromagnetic consideration","authors":"V. Chaurasiya, R. Tripathi, Ramayan Singh","doi":"10.24200/sci.2023.60381.6774","DOIUrl":"https://doi.org/10.24200/sci.2023.60381.6774","url":null,"abstract":": In the present research article, we address the magnetically controlled thermal and solutal Marangoni convection in the ﬂow of self-rewetting power-law liquid over a disk, in the existence of a space dependent heat source. The self re-wetting property of ﬂuid is modelled by considering a quadratic dependence of surface tension on temperature and species concentration. The afore-mentioned problem is modelled by simpliﬁed Navier-Stokes equations. Identifying the appropriate transform variables is essential for developing ordinary diﬀerential equations from original partial diﬀerential equations that describe the ﬂow conditions. The resulting ordinary diﬀerential equations are solved by using the bvp 4 c routine of MATLAB and numerical solutions are presented via Graphs and tables, illustrating the impact of several factors on ﬂuid velocity, temperature, and concentration. Computation of the quantities of physical interest such as Nusselt and Sherwood numbers are also done from those numerical solutions. One of the key ﬁndings of present research work is that the Marangoni convection works diﬀerently for pseudo-plastic ﬂuid and dilatant ﬂuid. On increasing thermal Marangoni convection the temperature of dilatant ﬂuid reaches a peak value much closer to the disk than temperature of pseudo plastic ﬂuid.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"87 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83519561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0