scholarly journals A dynamic multi-level optimal design method with embedded finite-element modeling for power transformers

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056610 ◽  
Author(s):  
Yunpeng Zhang ◽  
Siu-lau Ho ◽  
Weinong Fu
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Finite Element Modeling ◽  
Design Method ◽  
Power Transformers ◽  
Element Modeling ◽  
Multi Level ◽  
Optimal Design Method

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.

Finite Element Modeling for Optimizing Hermetic Package Reliability

1989 ◽  
Vol 111 (4) ◽  
pp. 255-260 ◽  
Author(s):  
J. H. Lau ◽  
L. B. Lian-Mueller
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimal Design ◽  
Thermal Behavior ◽  
Finite Element Modeling ◽  
Thermal Stresses ◽  
Finite Element Models ◽  
The Finite Element Method ◽  
Element Modeling ◽  
Package Reliability

The thermal stresses in microwave packages are studied by the finite element method. Emphasis is placed on the effects of material construction and design on the reliability of very small hermetic packages. Three different microwave packages have been designed and six finite element models (two for each design) have been analyzed. To verify the validity of the finite element results, some leak tests have been performed and the results agree with the analytical conclusions. The results presented herein should provide a better understanding of the thermal behavior of hermetic packages and should be useful for their optimal design.

Optimal Profile Design for the Resonator Beam of an Ultrasonic Motor via Finite Element Modeling and Taguchi Methodology

2004 ◽  
Vol 126 (4) ◽  
pp. 465-475 ◽  
Author(s):  
Paul C.-P. Chao ◽  
Jeng-Sheng Huang ◽  
Chi-Wei Chiu
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Output Power ◽  
Design Method ◽  
Ultrasonic Motor ◽  
Beam Profile ◽  
Taguchi Experimental Design ◽  
Element Modeling ◽  
Experimental Design Method ◽  
Profile Design

This study presents the optimal design for the resonator beam profile of a bimodal ultrasonic motor via finite element modeling and Taguchi experimental design method. General design goals of an ultrasonic motor are to maximize the output power while restraining the contact force in order to extend component lives. To achieve the aforementioned goals, based on recent studies, beam profile design could play an important role because geometric variants of profile lead to substantial changes in the output power of the motor and simultaneously affect the contact force significantly. To investigate the effect of various profiles on the performance of the ultrasonic motor, the dynamic equations of motion are first formulated by utilizing an extended Hamilton’s principle and the method of the Lagrange multiplier. The method of finite element modeling is meanwhile used to approximate the governing partial differential equations by a discrete, finite degree-of-freedom system. With the beam outer profile parametrized by cubic splines in terms of locations of two intercepts, the Taguchi experimental design method is finally applied based on the simulated dynamics of the derived finite system to distill generic design guidelines for beam profile of the ultrasonic motor. It is found that a general paraboliclike profile for beam outer shape is best suited for maximizing output power, while a vaselike profile leads to the worst performance.

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.

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