Damping and Natural Frequency Estimation Using the Least Pth Optimization Technique

1982 ◽  
Author(s):  
Xinsen Lu ◽  
J. Kim Vandiver
Keyword(s):  
Natural Frequency ◽  
Frequency Estimation ◽  
Optimization Technique

Topology Optimization of the Inner Reinforcement for a Vehicle’s Hood Using Smoothing Scheme

2007 ◽  
Vol 353-358 ◽  
pp. 2847-2850
Author(s):  
S.H. Choi ◽  
M.S. Kim ◽  
J.S. Hwang ◽  
J.Y. Park ◽  
Seok Young Han
Keyword(s):  
Topology Optimization ◽  
Natural Frequency ◽  
Optimization Technique ◽  
Optimal Solution ◽  
Weighting Factor ◽  
Pareto Optimal Solution ◽  
Optimal Topology ◽  
Checkerboard Pattern ◽  
Static Stiffness ◽  
Evolutionary Structural Optimization

Topology optimization of the inner reinforcement for a vehicle’s hood has been performed by evolutionary structural optimization (ESO) using a smoothing scheme. The purpose of this study is to obtain optimal topology of the inner reinforcement for a vehicle’s hood considering the static stiffness of bending and torsion, and natural frequency simultaneously. To do this, the multiobjective optimization technique was implemented. Optimal topologies were obtained by the ESO method. From several combinations of weighting factors, a Pareto-optimal solution was obtained. Also, a smoothing scheme was implemented to suppress the checkerboard pattern in the procedure of topology optimization. As the weighting factor of the elastic strain efficiency goes from 1 to zero, it is found that the optimal topologies transmits from the optimal topology of static stiffness problem to that of natural frequency problem. Therefore, it is concluded that ESO method with a smoothing scheme is effectively applied to topology optimization of the inner reinforcement of a vehicle’s hood considering the static stiffness and natural frequency.

762 Natural frequency estimation of rolling tire from excitation tests at contact area

2010 ◽  
Vol 2010 (0) ◽  
pp. _762-1_-_762-6_
Author(s):  
Nobutaka TSUJIUCHI ◽  
Takayuki KOIZUMI ◽  
Fumiya NAKAMURA ◽  
Masami MATSUBARA ◽  
Koji MATSUYAMA
Keyword(s):  
Natural Frequency ◽  
Contact Area ◽  
Frequency Estimation

Structure Design of a Machining Center Bed Based on Topology Optimization Technique

2014 ◽  
Vol 490-491 ◽  
pp. 580-585 ◽  
Author(s):  
Ya Li Ma ◽  
Zhen Gong ◽  
Chao Ma
Keyword(s):  
Topology Optimization ◽  
Natural Frequency ◽  
Conceptual Design ◽  
Optimization Technique ◽  
Structure Design ◽  
Original Structure ◽  
Element Analysis ◽  
First Order ◽  
Machining Center ◽  
Design Structure

This paper applies efficiently topology optimization technique to the conceptual design of a bed structure of machining center, which achieves for sufficient rigidity and reasonable distribution of weight of the bed. Firstly, conceptual design of the bed structure is obtained by using SIMP method under the conditions of a multi-objective optimization considering both the weighted structure compliance and the first-order natural frequency on multiple load cases and volume constraints. Subsequently, size design is employed to determine the main dimensions of the supporting plates and reinforcing ribs. During this stage an exhaustion method is identified to select suitable dimensions to optimize the structure performance. Finally, The Finite Element Analysis (FEM) is utilized for comparison of optimal and original bed structure. The FEM results indicate that the optimal design structure can reduce the mass by 6.6% with the less stiffness fluctuation and the first-order natural frequency can also improve by 7.9% compared with the original structure.

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