The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Quantian Luo - One of the best experts on this subject based on the ideXlab platform.
-
Optimal design of multi-cellular cores for sandwich panels under Harmonic Excitation
Composite Structures, 2020Co-Authors: Mahmoud Alfouneh, Quantian LuoAbstract:Abstract Sandwich panels with cellular cores are increasingly used in engineering due to their superb dynamic performance. In this type of structure, core design significantly affects its mechanical property. This article is to study optimal design of a multi-cellular core to minimize dynamic response of the sandwich panel under Harmonic Excitation by use of topology optimization. In this study, structural dynamic responses to Harmonic Excitation are discussed and formulations of the dynamic response in terms of strain and kinetic energy densities are derived. Topology optimization with multi-fractional volume constraint is conducted for multi-cellular core design to minimize the dynamic response of the sandwich panel under Harmonic Excitation. The optimization to minimize or maximize the dynamic responses are discussed in optimal core designs of sandwich panels. A multi-objective optimisation problem is also considered to optimally suppress Harmonic vibrations with a range of several frequencies. Numerical examples are presented to validate the derived formulations and to optimally design multi-cellular cores for sandwich panels to achieve better dynamic performance.
Julio Cesar De Moraes Fernandes - One of the best experts on this subject based on the ideXlab platform.
-
effects of asymmetrical damping on a 2 dof quarter car model under Harmonic Excitation
Communications in Nonlinear Science and Numerical Simulation, 2017Co-Authors: Marcos Silveira, Pankaj Wahi, Julio Cesar De Moraes FernandesAbstract:Abstract The objective of this work is to study the dynamical behavior of vehicle suspension systems employing asymmetrical viscous damping, with a focus on improving passenger comfort. Previous studies have shown that the use of asymmetrical dampers in these types of systems can be advantageous with regard to comfort of the passengers. The modeling and the behavior of a quarter-car model with asymmetrical viscous damping under Harmonic Excitation is presented. The response is obtained with an analytical approximation via the method of Harmonic Balance. The choice of the asymmetry ratio diminishes the effects that the uneven road causes on the displacement and acceleration of the sprung mass. Although current systems usually adopt larger damping during the expansion phase, it is shown in this work that, for lower frequencies, smaller damping in this phase results in better comfort.
Mahmoud Alfouneh - One of the best experts on this subject based on the ideXlab platform.
-
Optimal design of multi-cellular cores for sandwich panels under Harmonic Excitation
Composite Structures, 2020Co-Authors: Mahmoud Alfouneh, Quantian LuoAbstract:Abstract Sandwich panels with cellular cores are increasingly used in engineering due to their superb dynamic performance. In this type of structure, core design significantly affects its mechanical property. This article is to study optimal design of a multi-cellular core to minimize dynamic response of the sandwich panel under Harmonic Excitation by use of topology optimization. In this study, structural dynamic responses to Harmonic Excitation are discussed and formulations of the dynamic response in terms of strain and kinetic energy densities are derived. Topology optimization with multi-fractional volume constraint is conducted for multi-cellular core design to minimize the dynamic response of the sandwich panel under Harmonic Excitation. The optimization to minimize or maximize the dynamic responses are discussed in optimal core designs of sandwich panels. A multi-objective optimisation problem is also considered to optimally suppress Harmonic vibrations with a range of several frequencies. Numerical examples are presented to validate the derived formulations and to optimally design multi-cellular cores for sandwich panels to achieve better dynamic performance.
Marcos Silveira - One of the best experts on this subject based on the ideXlab platform.
-
effects of asymmetrical damping on a 2 dof quarter car model under Harmonic Excitation
Communications in Nonlinear Science and Numerical Simulation, 2017Co-Authors: Marcos Silveira, Pankaj Wahi, Julio Cesar De Moraes FernandesAbstract:Abstract The objective of this work is to study the dynamical behavior of vehicle suspension systems employing asymmetrical viscous damping, with a focus on improving passenger comfort. Previous studies have shown that the use of asymmetrical dampers in these types of systems can be advantageous with regard to comfort of the passengers. The modeling and the behavior of a quarter-car model with asymmetrical viscous damping under Harmonic Excitation is presented. The response is obtained with an analytical approximation via the method of Harmonic Balance. The choice of the asymmetry ratio diminishes the effects that the uneven road causes on the displacement and acceleration of the sprung mass. Although current systems usually adopt larger damping during the expansion phase, it is shown in this work that, for lower frequencies, smaller damping in this phase results in better comfort.
Wang Hao - One of the best experts on this subject based on the ideXlab platform.
-
Structural dynamic response topology optimization under basic Harmonic Excitation
Computer-Aided Engineering, 2012Co-Authors: Wang HaoAbstract:As to the facts that there are few studies on structural dynamic response topology optimization and it can not be achieved by the topology optimization modules of finite element analysis software,the dynamic response topology optimization of continuum structure under basic Harmonic Excitation is studied by variable density method.To control the response under basic Harmonic Excitation,an optimization model is established with an aim for minimization response amplitude of concern points under volume constraint;the response amplitude sensitivity equation of certain points is derived for structure with damp under basic Harmonic Excitation;then the optimization problem is solved by variable density method.The affiliated effect of SIMP(Solid Isotropic Microstructure with Penalization) model is solved by polynomial penalty model;a gray filtration method is used to solve the low convergence rate of gray elements in the optimization using classical variable density method,and the optimization iteration steps of variable density method are decreased and the optimization result becomes clearer.a plane cantilever plate is optimized,and the result indicates that the method can improve the optimization on the response amplitude of concern points and the gray filtration function can decrease optimization steps.
