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- 저자 : S. Etemadi (검색결과 3 건)
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S. Etemadi,H. Kouhi,A. Alasty,G.R. Vossoughi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper behavioral control of autonomous agents of a multi-agent system is considered. In previous paper authors presented a nonlinear approach for coordination of a group of autonomous agents by an active leader. The leader and other agents are assumed to possess limited field of view. The leader agent is able to lead the multi-agent system toward its destination only if all agents expose a quasi-static behavior. Agents as autonomous members may have higher equations of motion which can violate coordination control algorithm of the multi-agent system. To force every agent to behave as a member with quasi-static equation of motion we have designed a behavioral controller in this paper. The behavioral controller uses the local information for every agent and produces the control signal. It is based on the Sliding-mode control method so that the effect of bounded disturbances and uncertainties can be omitted as well. Once autonomous agents are equipped with the behavioral controller, the multi-agent system behaves similar to a group of agents with quasi-static behaviors and the coordination control algorithm is useable for the group.
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H. Tohidi,S.H. Hosseini-Hashemi,A. Maghsoudpour,S. Etemadi 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.62 No.5
Based on the strain gradient theory (SGT), vibration analysis of an embedded micro cylindrical shell reinforced with agglomerated carbon nanotubes (CNTs) is investigated. The elastic medium is simulated by the orthotropic Pasternak foundation. The structure is subjected to magnetic field in the axial direction. For obtaining the equivalent material properties of structure and considering agglomeration effects, the Mori-Tanaka model is applied. The motion equations are derived on the basis of Mindlin cylindrical shell theory, energy method and Hamilton’s principal. Differential quadrature method (DQM) is proposed to evaluate the frequency of system for different boundary conditions. The effects of different parameters such as CNTs volume percent, agglomeration of CNTs, elastic medium, magnetic field, boundary conditions, length to radius ratio and small scale parameter are shown on the frequency of the structure. The results indicate that the effect of CNTs agglomeration plays an important role in the frequency of system so that considering agglomeration leads to lower frequency. Furthermore, the frequency of structure increases with enhancing the small scale parameter.
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Tohidi, H.,Hosseini-Hashemi, S.H.,Maghsoudpour, A.,Etemadi, S. Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.25 No.2
This paper deals with the dynamic stability of embedded functionally graded (FG)-carbon nanotubes (CNTs)-reinforced micro cylindrical shells. The structure is subjected to harmonic non-uniform temperature distribution and 2D magnetic field. The CNT reinforcement is either uniformly distributed or FG along the thickness direction where the effective properties of nano-composite structure are estimated through Mixture low. The viscoelastic properties of structure are captured based on the Kelvin-Voigt theory. The surrounding viscoelastic medium is considered nonhomogeneous with the spring, orthotropic shear and damper constants. The material properties of cylindrical shell and the viscoelastic medium constants are assumed temperature-dependent. The first order shear deformation theory (FSDT) or Mindlin theory in conjunction with Hamilton's principle is utilized for deriving the motion equations where the size effects are considered based on Eringen's nonlocal theory. Based on differential quadrature (DQ) and Bolotin methods, the dynamic instability region (DIR) of structure is obtained for different boundary conditions. The effects of different parameters such as volume percent and distribution type of CNTs, mode number, viscoelastic medium type, temperature, boundary conditions, magnetic field, nonlocal parameter and structural damping constant are shown on the DIR of system. Numerical results indicate that the FGX distribution of CNTs is better than other considered cases. In addition, considering structural damping of system reduces the resonance frequency.
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