Browsing by Author "Ghalandari, Mohammad"

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Citation Count: Ghalandari, Mohammad...et al. (2022). "Aeroelastic Optimization of the High Aspect Ratio Wing with Aileron", CMC-Computers Materials & Continua, Vol. 70, No. 3, pp. 5569-5581.
Aeroelastic Optimization of the High Aspect Ratio Wing with Aileron
(2022) Ghalandari, Mohammad; Mahariq, Ibrahim; Ghadak, Farhad; Accouche, Oussama; Jarad, Fahd; 234808
In aircraft wings, aileron mass parameter presents a tremendous effect on the velocity and frequency of the flutter problem. For that purpose, we present the optimization of a composite design wing with an aileron, using machine-learning approach. Mass properties and its distribution have a great influence on the multi-variate optimization procedure, based on speed and frequency of flutter. First, flutter speed was obtained to estimate aileron impact. Additionally mass-equilibrated and other features were investigated. It can deduced that changing the position and mass properties of the aileron are tangible following the speed and frequency of the wing flutter. Based on the proposed optimization method, the best position of the aileron is determined for the composite wing to postpone flutter instability and decrease the existed stress. The represented coupled aero-structural model is emerged from subsonic aerodynamics model, which has been developed using the panel method in multidimensional space. The structural modeling has been conducted by finite element method, using the p-k method. The fluid -structure equations are solved and the results are extracted.
Citation Count: Ghalandari, Mohammad...et al. (2022). "Identification of composite-metal bolted structures with nonlinear contact effect", Computers, Materials and Continua, Vol. 70, No. 2, pp. 3383-3397.
Identification of composite-metal bolted structures with nonlinear contact effect
(2022) Ghalandari, Mohammad; Mahariq, Ibrahim; Pourghasem, Majid; Mulki, Hasan; Jarad, Fahd; 234808
The middle layer model has been used in recent years to better describe the connection behavior in composite structures. The influencing parameters including low pre-screw and high preload have the main effects on nonlinear behavior of the connection as well as the amplitude of the excitation force applied to the structure. Therefore, in this study, the effects of connection behavior on the general structure in two sections of increasing damping and reducing the stiffness of the structures that lead to non-linear phenomena have been investigated. Due to the fact that in composite structure we are faced to the limitation of increasing screw preload which tend to structural damage, so the investigation on the hybrid connection (metal-composite) behavior is conducted. In this research, using the two-dimensional middle layer theory, the stiffness properties of the connection are modeled by normal stiffness and the connection damping is modeled using the structural damping in the shear direction. Nonlinear frequency response diagrams have been extracted twice for two different excitation forces and then proposed by a high-order multitasking approximation according to the response range of the nonlinear finite element model for stiffness and damping of the connection. The effect of increasing the amplitude of the excitation force and decreasing the preload of the screw on the nonlinear behavior of the component has been extracted. The results show that the limited presented novel component model has been accurately verified on the model obtained from the vibration experimental test and the reduction of nonlinear model updating based on that is represented. The comparison results show good agreement with a maximum of 1.33% error. © 2022 Tech Science Press. All rights reserved.