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Open Access Article
1 - Frequency responses analysis of clamped-free sandwich beams with porous FG face sheets
Mohsen RahmaniIn this paper, the frequency responses analysis of the sandwich beams with functionally graded face sheets and homogeneous core is investigated based on the high order sandwich beam theory. All materials are temperature dependent and the functionally graded materials pr MoreIn this paper, the frequency responses analysis of the sandwich beams with functionally graded face sheets and homogeneous core is investigated based on the high order sandwich beam theory. All materials are temperature dependent and the functionally graded materials properties are varied gradually by a power law rule which is modified by considering the even and uneven porosity distributions. The nonlinear Lagrange strain and the thermal stresses of the face sheets and in-plane strain and transverse flexibility of the core are considered. Hamilton’s principle and Galerkin method are used to obtain and solve the equations for the clamped-free boundary condition. To verify the results of this study, they compared with special cases of the literatures. Based on the numerical results, it is concluded that by increasing the temperature, power law index, length, thickness, porosity volume fraction the fundamental frequency parameter decreases and increasing the wave number causes the frequency increases. Manuscript profile -
Open Access Article
2 - Table of Contents
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Open Access Article
3 - Comparison between continuous sensitivity analysis and Taguchi method in optimization of electromechanical devices
Mohammadali TavakkoliIn this paper, the optimization of electromechanical devices by continuous sensitivity analysis and its comparison with Taguchi method is investigated. The present research can be useful for researchers in one of the important and practical issues that is the optimizati MoreIn this paper, the optimization of electromechanical devices by continuous sensitivity analysis and its comparison with Taguchi method is investigated. The present research can be useful for researchers in one of the important and practical issues that is the optimization of different systems. In practice, it will be observed that the continuous sensitivity analysis method, in addition to achieving significant results, also increases the convergence rate significantly compared with the Taguchi method. In addition to the above, this dissertation also tries to improve the method of continuous sensitivity analysis, which has been done using the help of interpolation such as Spline and Bizar. One of the advantages of the continuous sensitivity analysis method using Spline interpolation in comparison with the Taguchi method is the absence of sharp angles at the optimized border and ease of construction. This specification is of great importance in electromagnetic devices. The main purpose of this article is to compile a complete and understandable reference for use in today's industry and further studies. Manuscript profile -
Open Access Article
4 - Self-tuning consensus on directed graph in the case of time-varying nonhomogeneous input gains
Mozhgan BagherboumIn this paper, the problem of self-tuning of coupling parameters in multi-agent systems is considered. Agent dynamics are described by a discrete-time double integrator with time-varying nonhomogeneous input gain. The coupling parameters defining the strength of agents MoreIn this paper, the problem of self-tuning of coupling parameters in multi-agent systems is considered. Agent dynamics are described by a discrete-time double integrator with time-varying nonhomogeneous input gain. The coupling parameters defining the strength of agents interactions are locally self-tuning by each node based on the velocities of its neighbors. The cost function is equal to the square of the local error between the agent velocity and the weighted average of the velocities of interacting neighbors. So, the proposed algorithm is the normalized gradient algorithm which is minimized the square of the local error between the agent velocity and the one step delayed average of the velocities of its neighbors. Provided that the underlying graph is strongly connected, it is shown that the sequence of the inter-agent coupling parameters generated by the proposed algorithm is convergent. Also, assuming the suitable initial condition on coupling parameters, it is proved that the network achieves average consensus. In other words, the agent velocities converge toward the average of the initial velocities values. Furthermore, the distance among agents converges to a finite limit. Simulation results illustrate effectiveness of the proposed method. Manuscript profile -
Open Access Article
5 - Evaluation of the use of robotic surgery with remote simulation for use in the field of Medical Tourism and Pro-Tourism development
Esmaeil Khaksarshahmirzadi Tulen Saner Ali Attaeyan Somayeh Abdollahi Molood Mohammadi Sharif HeydariToday, using modern technology and software simulation, it is possible to help the medical tourism industry with the support of treating patients all over the world in order to treat diseases for those who are not able to migrate. Therefore, in this study we consider al MoreToday, using modern technology and software simulation, it is possible to help the medical tourism industry with the support of treating patients all over the world in order to treat diseases for those who are not able to migrate. Therefore, in this study we consider all the essential parameter to reach to the best condition for medical tourism using robotic and artificial intelligence (AI) system. Recently, information technology has penetrated in all fields and changed the face of many phenomena. In the field of medicine, engineering and tourism, the use of this technology is becoming a necessity by using advance robots. Telemedicine is a general concept used to describe various aspects of telemedicine care. The main idea of telemedicine is to transmit information via electrical signals and to automate clinical services and counseling all around the world by advance and smart system. Use of robots, AI and the creation of medical robots as assistants to physicians. The success of medical robot’s design and construction means that the realization of such ideas cannot be unexpected. Today, the use of robots in various fields of medicine, from the creation of small cavities without the need for deep incisions to complex surgeries has become possible. One of the goals of telemedicine is to improve patient care, improve access and medical care for rural areas and deprive better access to physicians for counseling. Telemedicine includes distance counseling E-learning, remote monitoring, remote surgery treatment of skin diseases telemedicine ultrasound imaging, pathology, and remote cognitive disorders treatment. The observation indicated that using progressed telemedicine and remote surgery has become possible in which skilled surgeon in one country with strong internet connections and precise technical infrastructure can perform the surgery quickly. Manuscript profile -
Open Access Article
6 - Stabilized crack-opening stresses as a function of R-ratios and stress levels
Rahi Chermahini Majid JabbariAn elastic-perfectly plastic middle crack tension aluminum 2024-T3 alloy was used under plane stress, plane strain and 3D analysis to determine stabilized crack-opening stresses for different R-ratios and stress levels. The stabilized crack-opening stresses of a 3D anal MoreAn elastic-perfectly plastic middle crack tension aluminum 2024-T3 alloy was used under plane stress, plane strain and 3D analysis to determine stabilized crack-opening stresses for different R-ratios and stress levels. The stabilized crack-opening stresses of a 3D analysis locate between those values of plane stress and plane strain conditions. Using the above strategy, one can determine crack-opening stresses for any desired thickness value using interpolating scheme. Two and three dimensional programs were developed based on small strain elasticity theory incorporating linear strain isoparametric elements. The plasticity part of the analysis uses initial stress approach. The crack was extended one element size as the applied load reached the maximum value of each load cycle. Crack opening and closure stresses of nodes on the crack surface plane after some cyclic crack extensions are demonstrated. Based on the obtained results, for the three-dimensional finite-element analysis, the calculated stabilized crack opening stresses always locate between those of plane stress and plane strain conditions. Manuscript profile -
Open Access Article
7 - Specifying the allowed remained bottom thickness after milling in CNG steel cylinders by FEM analysis and experimentation
Mojtaba Esmailian Mohsen Shahmoradi Kamran KarimzadehIn CNG steel cylinders produced by the hot spinning method from seamless tubes, homogeneity of the material in the closed-end region is a significant factor. Therefore, in the production process, the produced cups are immediately under a hot heavy press, and in addition MoreIn CNG steel cylinders produced by the hot spinning method from seamless tubes, homogeneity of the material in the closed-end region is a significant factor. Therefore, in the production process, the produced cups are immediately under a hot heavy press, and in addition to forming the bottom shape, the heterogeneous area is driven out, finally, this region is eliminated via machining. Ideally, the depth of this milled area should be to the extent that the heterogeneous region is completely removed, also according to the designing standards, the minimum bottom thickness shall be more than that of wall thickness. However, the problem is that controlling this parameter is impossible in the machining process, and in some cases, it may become more than the specified limit. In this research, the minimum allowed remained thickness after bottom milling has been obtained by analysis and also compared with real results acquired from static and fatigue tests. Deducing the results of the FEM analysis, it can be seen that the remained bottom thickness up to 6mm has no limitation for the endurance hydrostatic pressure, and that was supported by experimental burst tests. Considering this amount for the bottom thickness, the percentage of rejected products declined considerably from 4% to 2% in the factory. Manuscript profile
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