An Optimal Design Method for Damping Structure With Constrained Viscoelastic Material

1992 ◽  
Author(s):  
Satomitsu Imai ◽  
Taichi Sato ◽  
Syouichi Setone ◽  
Tetsuo Masukawa
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Viscoelastic Material ◽  
Tensile Deformation ◽  
Design Method ◽  
Material Behavior ◽  
Accurate Analysis ◽  
Maximum Deformation ◽  
Damping Effect ◽  
Optimal Design Method

Abstract This paper describes an optimal design method for a damping structure using constrained viscoelastic material. The relationship between viscoelastic material behavior and the damping effect, is analyzed by finite element method, where viscoelastic material is modeled by discrete spring elements with the equivalent stiffness and loss factor. This finite element model is applied to the design of a head-gimbal-assembly (HGA) of a magnetic disk device and its reliability is confirmed experimentally. The analysis shows that the maximum deformation of the constrained viscoelastic material occurs at the edge area, so to optimize the damping structure, this area should be placed on the area of high strain energy. Although the damping effect by constrained viscoelastic material has been considered due to shear deformation of viscoelastic material, in this analysis, tensile deformation of the egde of viscoelastic material is strongly related to the damping effect for the bending and torsional modes of HGA. Therefore, an accurate analysis must consider tensile deformation of viscoelastic material.

Optimization Design Method of the Pre-Manufactured Hole of Flanging

2013 ◽  
Vol 395-396 ◽  
pp. 1206-1211 ◽  
Author(s):  
Yang Li ◽  
Zhong Lei Wang ◽  
Xiao Li ◽  
Gang Cheng
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Finite Element Simulation ◽  
Optimization Design ◽  
Design Method ◽  
Line Length ◽  
Theoretical Formula ◽  
Equal Area ◽  
Element Simulation ◽  
Optimal Design Method

For the difficulty of calculating the size of the Pre-Manufactured hole of flanging, the formula was derived by using the theory of equal line length and the theory of equal area. And the formula was verified by finite element simulation. Due to theoretical formula has certain error, the optimal design method based on interpolation was put forward and optimization design the size of the Pre-Manufactured hole of flanging. Engineering example shows that this optimization design method is accuracy and convergence speed, and it can quickly calculate the the size of the Pre-Manufactured hole of flanging.

scholarly journals An Optimal Design Method for Compliant Mechanisms

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Ngoc Le Chau ◽  
Ngoc Thoai Tran ◽  
Thanh-Phong Dao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimal Design ◽  
Compliant Mechanisms ◽  
Design Method ◽  
Fitness Function ◽  
Current Method ◽  
Design Parameters ◽  
Optimal Design Method ◽  
Element Method

Compliant mechanisms are crucial parts in precise engineering but modeling techniques are restricted by a high complexity of their mechanical behaviors. Therefore, this paper devotes an optimal design method for compliant mechanisms. The integration method is a hybridization of statistics, finite element method, artificial intelligence, and metaheuristics. In order to demonstrate the superiority of the method, one degree of freedom is considered as a study object. Firstly, numerical datasets are achieved by the finite element method. Subsequently, the main design parameters of the mechanism are identified via analysis of variance. Desirability of both displacement and frequency of the mechanism is determined, and then, they are embedded inside a fuzzy logic system to combine into a single fitness function. Then, the relationship between the fine design variables and the fitness function is modeled using the adaptive network-based fuzzy inference system. Next, the single fitness function is maximized via moth-flame optimization algorithm. The optimal results determined that the frequency is 79.517 Hz and displacement is 1.897 mm. In terms of determining the global optimum solution, the current method is compared with the Taguchi, desirability, and Taguchi-integrated fuzzy methods. The results showed that the current method is better than those methods. Additionally, the devoted method outperforms the other metaheuristic algorithms such as TLBO, Jaya, PSOGSA, SCA, ALO, and LAPO in terms of faster convergence. The result of this study will be considered to apply for multiple-degrees-of-freedom compliant mechanisms in future work.

Structure Optimal Design Method and Engineering Application

2011 ◽  
Vol 311-313 ◽  
pp. 2440-2443
Author(s):  
Heng Xu Qu
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Weight Reduction ◽  
Reference Data ◽  
Design Method ◽  
Engineering Application ◽  
Practical Significance ◽  
Optimal Result ◽  
Original Weight ◽  
Optimal Design Method

he paper introduces the analysis of finite element for gearbox’s intensity, then optimal design for gearbox has achieved good optimal result leading to the weight reduced 3746kg, 23.18%less than original weight with the thickness of the main board as deign variables and the stress and displacement as constraint conditions. The optimization results have practical significance on the structural optimization and the weight of the gearbox, offering reference data for weight reduction of gear box design.

scholarly journals Development of Optimal Design Method for Steel Double-Beam Floor System Considering Rotational Constraints

2021 ◽  
Vol 11 (7) ◽  
pp. 3266
Author(s):  
Insub Choi ◽  
Dongwon Kim ◽  
Junhee Kim
Keyword(s):  
Optimal Design ◽  
Design Process ◽  
Design Method ◽  
Steel Beams ◽  
High Gravity ◽  
Double Beam ◽  
Iterative Analysis ◽  
Floor Systems ◽  
Optimal Design Method ◽  
Floor System

Under high gravity loads, steel double-beam floor systems need to be reinforced by beam-end concrete panels to reduce the material quantity since rotational constraints from the concrete panel can decrease the moment demand by inducing a negative moment at the ends of the beams. However, the optimal design process for the material quantity of steel beams requires a time-consuming iterative analysis for the entire floor system while especially keeping in consideration the rotational constraints in composite connections between the concrete panel and steel beams. This study aimed to develop an optimal design method with the LM (Length-Moment) index for the steel double-beam floor system to minimize material quantity without the iterative design process. The LM index is an indicator that can select a minimum cross-section of the steel beams in consideration of the flexural strength by lateral-torsional buckling. To verify the proposed design method, the material quantities between the proposed and code-based design methods were compared at various gravity loads. The proposed design method successfully optimized the material quantity of the steel double-beam floor systems without the iterative analysis by simply choosing the LM index of the steel beams that can minimize objective function while satisfying the safety-related constraint conditions. In particular, under the high gravity loads, the proposed design method was superb at providing a quantity-optimized design option. Thus, the proposed optimal design method can be an alternative for designing the steel double-beam floor system.

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