Ravishhayi adadi dar Muhandisi最新文献

Simulation of Non-Isothermal Flow of Rubber in Banbury Mixer Using Computational Fluid Dynamics 用计算流体力学模拟橡胶在班伯里混合器内的非等温流动

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.9671

{"title":"Simulation of Non-Isothermal Flow of Rubber in Banbury Mixer Using Computational Fluid Dynamics","authors":"","doi":"10.47176/jcme.42.1.9671","DOIUrl":"https://doi.org/10.47176/jcme.42.1.9671","url":null,"abstract":"Mixing is one of the first and necessary steps in the industrial process of rubber production. The main purpose of mixing involves combining materials, adding energy to break the molecular bonds, and combining materials with air. Executive operation is effective in the mixing quality. The present research is on the non-isothermal simulation of mixing in a Banbury mixer. Three-dimensional numerical studies, using computational fluid dynamics, have been carried out in order to use different operational parameters. The movement of the surfaces in the calculations has been considered through the sliding mesh technique, and the fluid volume method has been used in the Eulerian approach to track the interface between the rubber phase and air. The carreau-Yasuda non-Newtonian viscosity model, along with an Arrhenius formula, has been used to determine the temperature-dependent viscosity of rubber. The results of this research show that the high viscosity of rubber becomes viscous when heated. This phenomenon is especially in the narrow area between the tip of the rotor and the wall, where there is a higher shear, and this factor affects the viscosity and flow characteristics of the rubber.","PeriodicalId":31381,"journal":{"name":"Ravishhayi adadi dar Muhandisi","volume":"375 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135686940","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

Dynamic Stability Analysis of FGM Beams Based on the Nonlinear Timoshenko Model 基于非线性Timoshenko模型的FGM梁动力稳定性分析

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.8602

{"title":"Dynamic Stability Analysis of FGM Beams Based on the Nonlinear Timoshenko Model","authors":"","doi":"10.47176/jcme.42.1.8602","DOIUrl":"https://doi.org/10.47176/jcme.42.1.8602","url":null,"abstract":"Various types of dynamic instabilities in mechanical systems are one of the most important disruptive factors in such structures. Therefore, an accurate study of dynamic instability in beams, as one of the fundamental engineering structures, is of great importance. In this paper, dynamic instability problem of beams made of Functionally Graded Materials (FGM) is investigated. For this purpose, the first-order shear deformation (or the Timoshenko) beam theory with the effects of geometric nonlinearity is considered. Thus, the proposed model has the ability to determine mechanical behavior of thin and thick beams. By considering the energy functions of the system, and implementing the Hamilton’s principle, the governing equations are obtained along with different types of common boundary conditions. The Differential Quadrature Method (DQM), as one of the best-known numerical methods, is used. The nonlinear partial differential equations are written in the form of equivalent ordinary differential equations. Then, considering the harmonic responses for the system, the differential equations are converted to a set of nonlinear algebraic equations. Finally, in order to study the important parameters, various numerical examples are provided. The obtained numerical results are compared with the literature and thus, the validity of the presented formulation and solution methodology is revealed. Also, a comparative study between linear and nonlinear kinematic models shows that the importance of geometric nonlinearity of the model is quite significant.","PeriodicalId":31381,"journal":{"name":"Ravishhayi adadi dar Muhandisi","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135686942","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

A Review on Techniques of Domain Integrals Computation in Boundary Elements Method 边界元法领域积分计算技术综述

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.3742

引用次数: 0

A New Bond-Based Peridynamic Model with the Ability to Model Elastoplastic Behavior 一种新的基于键的周动力学模型，具有模拟弹塑性行为的能力

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.1002

引用次数: 0

Study of the Free Vibration of Joined Hybrid Cylindrical-Conical Shells with the Generalized Differential Quadrature Method 用广义微分正交法研究圆柱-圆锥复合连接壳的自由振动

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.10051

{"title":"Study of the Free Vibration of Joined Hybrid Cylindrical-Conical Shells with the Generalized Differential Quadrature Method","authors":"","doi":"10.47176/jcme.42.1.10051","DOIUrl":"https://doi.org/10.47176/jcme.42.1.10051","url":null,"abstract":"In this research, the free vibration of the joint of two hybrid cylindrical-conical shells have been studied, considering the continuity conditions in the joint of the two shells, based on the first order shear deformation shell theory. The equations of the joint of two shells have been extracted using the Hamilton’s principle, and solved by applying the generalized differential quadrature method under different boundary conditions. Also, hybrid shells are composed of composite layers in the core and two layers of aluminum metal at the top and bottom of the shells. In this study, the Carbon- Epoxy, Glass- Epoxy and Aramid-Epoxy composite materials are used. The results obtained in this research are compared with previous studies, and there is a very good agreement between the results. Also, the effects of cone angle of the conical shell, boundary conditions, volume fraction, circumferential mode, composite materials, variation of length to shell radius and variation of thickness to shell radius, on the natural frequency have been investigated. The results have shown that, with the increase of the cone angle of the conical shell, the dimensionless natural frequency of the joint of two cylindrical- conical shells increased. Also, with increase of the circumferential mode, the non-dimensional frequency of the structure of two joined hybrid shells, first decreased and then increased.","PeriodicalId":31381,"journal":{"name":"Ravishhayi adadi dar Muhandisi","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135686947","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

Design of an Optimal Cooperative Guidance Law Confronting Evaders with High Maneuver 面对高机动规避者的最优协同制导律设计

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.9081

引用次数: 0

Vibration Analysis of Thick Sandwich Plates with Saturated FG-Porous Core Using Quasi-3D Shear Deformation Theory 基于准三维剪切变形理论的饱和fg多孔芯厚夹层板振动分析

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.9621

引用次数: 0

Scaled Boundary Finite Element Method Coupled with Equilibrated Basis Functions for Heat Transfer Problems 耦合平衡基函数的尺度边界有限元法求解传热问题

Ravishhayi adadi dar Muhandisi Pub Date : 2023-09-01 DOI: 10.47176/jcme.42.1.1005

{"title":"Scaled Boundary Finite Element Method Coupled with Equilibrated Basis Functions for Heat Transfer Problems","authors":"","doi":"10.47176/jcme.42.1.1005","DOIUrl":"https://doi.org/10.47176/jcme.42.1.1005","url":null,"abstract":"The Scaled Boundary Finite Element Method (SBFEM) discretizes only the boundary by using a technique for scaling the domain response onto its boundary. In this research, heat transfer problems in two-dimensional space are solved with a new approach based on combining the scaled boundary finite element method and the equilibrated basis functions. The SBFEM develops its relations in radial and circumferential coordinate systems, but only discretizes the boundary of the problem through development of a semi-analytical solution in radial direction. So the challenges of appropriate elemental grid for the solution domain, or the need for fundamental solutions of the equation, as usual in the finite element method or the boundary element method respectively, do not appear. In this research, after scaling the boundary in the scaled boundary finite element method and extracting the related equations, the equilibrated basis functions are used to approximate the semi-analytical solution in radial direction. After estimating the radial solution by the first kind Chebyshev polynomials, the weighted residual form of the governing equation is applied for approximately satisfaction. Finally, the unknown degrees of freedom of the boundary are derived, and there will be no need for the usual eigenvalue solution of the SBFEM. It will be shown that this approach benefits good accuracy and convergence rate.","PeriodicalId":31381,"journal":{"name":"Ravishhayi adadi dar Muhandisi","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135686953","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

Analysis of Thin Isotropic and Orthotropic Plates with Element-Free Galerkin Method and Various Geometric Shapes 不同几何形状的薄各向同性和正交异性板的无单元伽辽金法分析

Ravishhayi adadi dar Muhandisi Pub Date : 2016-01-10 DOI: 10.18869/ACADPUB.JCME.34.2.143

H. Edalati, B. Soltani

引用次数: 1