Structural Dynamic Topology Optimization of the Transmission Housing

2011 ◽  
Vol 308-310 ◽  
pp. 368-372
Author(s):  
Shou Wen Yao ◽  
Jian Li Lv ◽  
Qing Dong Peng
Keyword(s):  
Topology Optimization ◽  
Dynamic Performance ◽  
Cad Model ◽  
Mass Reduction ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Design Variables ◽  
The Finite Element Analysis ◽  
Dynamic Topology ◽  
Topology Model

Dynamic performance is one of the most important factors in the product’s life. Transmission housing is one of the important components in vehicle, which has direct influence on the vehicle’s powertrain performance. Dynamic topology optimization can improve the product’s performance. The dynamic topology model is built, in which the density of elements are the design variables, the displacement of frequency response and volume are the constraints, and the objective is to maximize the first natural frequency of the housing. According to the result of optimization, the CAD model of housing is rebuilt and the finite element analysis of the new housing is done.The results show that both the static and dynamic performance are improved besides the mass reduction, namely, dynamic topology optimization can significantly improve the product’s performance.

The Finite Element Analysis and the Multi-Objective Optimization Design of Spindle Systems of CNC Gantry Machine Tools

2016 ◽  
Vol 693 ◽  
pp. 243-250
Author(s):  
Zhi Zhong Guo ◽  
Yun Shun Zhang ◽  
Shi Hao Liu
Keyword(s):  
Machine Tools ◽  
Optimization Design ◽  
Multi Objective Optimization ◽  
Element Analysis ◽  
Multi Objective ◽  
Vibration Resistance ◽  
Design Variables ◽  
Force Coupling ◽  
The Finite Element Analysis ◽  
Spindle Structure

It is discovered that the vibration resistance of spindle systems needs to be improved based on the statics analysis, modal analysis and heating-force coupling analysis of spindle systems of CNC gantry machine tools. The design variables of optimization are set according to sensitivity analysis, multi-objective and dynamic optimization design is realized and its designing scheme is gained for spindle structure. The research results show that vibration resistance can be improved without change of the quality and static property of spindle systems of CNC gantry machine tools.

Optimization design of titanium alloy connecting rod based on structural topology optimization

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Bin Zheng ◽  
Yi Cai ◽  
Kelun Tang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Optimization Design ◽  
Equivalent Stress ◽  
Connecting Rod ◽  
Element Analysis ◽  
Content Type ◽  
The Finite Element Analysis ◽  
Maximum Equivalent Stress

Purpose The purpose of this paper is to realize the lightweight of connecting rod and meet the requirements of low energy consumption and vibration. Based on the structural design of the original connecting rod, the finite element analysis was conducted to reduce the weight and increase the natural frequencies, so as to reduce materials consumption and improve the energy efficiency of internal combustion engine. Design/methodology/approach The finite element analysis, structural optimization design and topology optimization of the connecting rod are applied. Efficient hybrid method is deployed: static and modal analysis; and structure re-design of the connecting rod based on topology optimization. Findings After the optimization of the connecting rod, the weight is reduced from 1.7907 to 1.4875 kg, with a reduction of 16.93%. The maximum equivalent stress of the optimized connecting rod is 183.97 MPa and that of the original structure is 217.18 MPa, with the reduction of 15.62%. The first, second and third natural frequencies of the optimized connecting rod are increased by 8.89%, 8.85% and 11.09%, respectively. Through the finite element analysis and based on the lightweight, the maximum equivalent stress is reduced and the low-order natural frequency is increased. Originality/value This paper presents an optimization method on the connecting rod structure. Based on the statics and modal analysis of the connecting rod and combined with the topology optimization, the size of the connecting rod is improved, and the static and dynamic characteristics of the optimized connecting rod are improved.

Development and Analysis for a New Compliant XY Micropositioning Stage Applied for Nanoindentation Tester System

2019 ◽  
Vol 894 ◽  
pp. 60-71
Author(s):  
Minh Phung Dang ◽  
Thanh Phong Dao ◽  
Hieu Giang Le ◽  
Ngoc Thoai Tran
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Taguchi Method ◽  
Optimization Problems ◽  
High Reliability ◽  
Hybrid Approach ◽  
Element Analysis ◽  
Amplification Ratio ◽  
Design Variables ◽  
The Finite Element Analysis

A Compliant XY micropositioning stage is purported for situating a material sample in nanoindentation tester process. This paper aims to develop, analyze and optimize a XY compliant micropositioning stage. The working stroke of proposed XY stage is amplified by combining the four-lever and a bridge amplification mechanism. To enhance the performances of the stage, the main geometric parameters are optimized by an integration method of Taguchi method, response surface method (RSM) and genetic algorithm (GA). Firstly, static analysis and dynamic analysis are conducted by the finite element analysis in order to predict initial performances of the XY stage. Secondly, the number of experiments and the data are retrieved by combination of the finite element analysis-integrated Taguchi method. Thirdly, the effects of main design variables on the output response sensitivity are considered. Later on, mathematical model for the amplification ratio was established by the RSM. Finally, based on the mathematical equation, the GA is adopted to define the optimal design variables. The results of numerical validations are in a good agreement with the predicted results. The results depicted that the proposed hybrid approach ensures a high reliability for engineering optimization problems.

Performance of Depressurization Devices to Dynamic Loads Generated by Arcing in Liquid Filled Transformers

2018 ◽  
Author(s):  
Ashwin Padmanaban Iyer ◽  
Anne Goj ◽  
Omar K. Ahmed
Keyword(s):  
Pressure Wave ◽  
Dynamic Performance ◽  
Sine Wave ◽  
Evaluation Methodology ◽  
Element Analysis ◽  
Loading Rates ◽  
Fea Model ◽  
The Finite Element Analysis ◽  
Rupture Disk ◽  
Dielectric Insulation

This study provides a methodology that can be used to evaluate the dynamic performance of fast depressurization devices used in liquid-filled oil transformers. Liquid-filled transformers are susceptible to explosions due to internal arcing if the dielectric insulation fails. The internal arc vaporizes a portion of the liquid and generates a sudden pressure wave. The first peak of the pressure wave has been measured to be as high as 13 bars, with time durations on the order of milliseconds [1]. Transformer tanks have a typical static withstand limit of approximately 1 bar gauge [2]. It is thus imperative that the tank be depressurized before the static pressure reaches such a threshold. One industry-accepted Fast Depressurization System [3] used to depressurize transformers after an internal arc is based on a patented rupture disk design [4]. This study compares the dynamic performance of this disk to results from a successful test campaign using a rupture disk as the depressurization device. Limiting loading rate values from the test campaign are then used to comment on the effectiveness of the design. The evaluation methodology is based on Pressure-Impulse (P-I) curves. The P-I curve was generated by running a series of Implicit Dynamic analysis using Code_Aster [5]. This iterative process first required establishing a failure mode that is consistent with actual observed failure in the field and observable in the Finite Element Analysis (FEA) model. The criteria were then used in interpreting the response of the Rupture Disk to a series of different half-sine wave pulse loading of varying amplitudes and time-periods. The generated P-I curve was then compared to loading rates observed in the test campaign [1] as well as three other higher loading rates (1.28 times, 2 times, 3.8 times, and 10.25 times the reported experimental rate) to qualitatively assess the effectiveness of the design. Results indicated that disk functions extremely effectively as a Fast Depressurization System as also corroborated by the test campaign. Although this methodology is used for the rupture disk, it is expected that this methodology can be extended to compare the dynamic performance of other depressurization devices.

Finite Element Analysis and Topology Optimization of the Clamping Unit in a Two-Platen Injection Machine

2011 ◽  
Vol 117-119 ◽  
pp. 1535-1542 ◽  
Author(s):  
Hua Wei Zhang ◽  
Wei Xia ◽  
Zhi Heng Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Element Model ◽  
Molding Machine ◽  
Element Analysis ◽  
And Topology ◽  
The Finite Element Analysis ◽  
Set Up ◽  
The Finite Element Model

In this paper, the clamping unit of a two-platen injection molding machine was modeled by Pro/ENGINEER, and was imported to Altair HyperWorks. In HyperMesh module, the finite element model was set up, ANSYS has been used in the finite element analysis of the clamping unit and the deformation and stress results were obtained. Based on the topology optimization of HyperWorks/OptiStruct, recommendations to improve the structure of the clamping mechanism are presented; the results showed that less material was used while its performance was maintained.

Displacement and Stress Constrained Topology Optimization

2013 ◽  
Author(s):  
Meisam Takalloozadeh ◽  
Krishnan Suresh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Level Set ◽  
Numerical Experiments ◽  
Optimization Method ◽  
Stress Constraints ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Topology Optimization Method

The objective of this paper is to demonstrate a topology optimization method subject to displacement and stress constraints. The method does not rely on pseudo-densities; instead it exploits the concept of topological level-set where ‘partial’ elements are avoided. Consequently: (1) the stresses are well-defined at all points within the evolving topology, and (2) the finite-element analysis is robust and efficient. Further, in the proposed method, a series of topologies of decreasing volume fractions are generated in a single optimization run. The method is illustrated through numerical experiments in 2D.

Contact Analysis and Optimization of a New Type of Propeller Shaft-Hub Connection Structure

2011 ◽  
Vol 328-330 ◽  
pp. 801-805
Author(s):  
Wen Jing Li ◽  
Hua Sun ◽  
Rui Xiang Chen
Keyword(s):  
Theoretical Basis ◽  
State Variables ◽  
Elastic Ring ◽  
Analysis Software ◽  
Element Analysis ◽  
Composite Shaft ◽  
Design Variables ◽  
The Finite Element Analysis ◽  
Nonlinear Contact ◽  
New Type

According to the characteristics of aero products, the products must be as simple and light as possible under the premise of ensuring the performance. Using the finite element analysis software ANSYS to establish a nonlinear contact model about a new type of composite shaft-hub connection structure which is used in the propeller. Based on the model to give a optimization about the elastic ring, part of the shaft-hub connection structure, which defines the semi-cone angleαand the width B of the elastic ring as the design variables, the stress of the elastic ring as the state variables. The optimization results lay the theoretical basis of designing a composite shaft-hub connection structure which meets the requirement of aero products.

scholarly journals Sensitivity Analysis of Internally Reinforced Thin-Walled Hollow-Box Beams Subjected to Uncoupled Bending and Torsion

2019 ◽  
Vol 23 (1) ◽  
pp. 1-8
Author(s):  
Hugo Miguel Silva ◽  
Jerzy Wojewoda
Keyword(s):  
Finite Element Analysis ◽  
Sensitivity Analysis ◽  
Analysis Software ◽  
Element Analysis ◽  
Design Variables ◽  
The Finite Element Analysis ◽  
Box Beams ◽  
Thin Walled ◽  
Geometric Variables ◽  
Bending Loading

Abstract In this work, novel types of internally reinforced hollow-box beams were subjected to bending loading and studied using the finite element analysis software ANSYS. A parameterization of 3 geometric variables was performed, and deflection and effective deflection results were collected from 2 points at the model. The sensitivity analysis results are then discussed, with the aim of concluding if the selected design variables are adequate for optimization purposes.

Study on Bearing Dynamic Properties of Nano-Particle Reinforced ZA27 Alloy Composite Material

2011 ◽  
Vol 328-330 ◽  
pp. 1467-1470
Author(s):  
Zhou Qin ◽  
Kun Peng Ma
Keyword(s):  
Aluminum Alloy ◽  
Dynamic Properties ◽  
Dynamic Performance ◽  
Nano Particles ◽  
Zinc Alloy ◽  
Element Analysis ◽  
Application Range ◽  
Za27 Alloy ◽  
Frictional Characteristic ◽  
The Finite Element Analysis

Although the zinc-aluminum alloy has gotten substantial increase in terms of strength and friction characteristics than the traditional zinc alloy, it has limitation in the operating temperature and speed. In order to further improve the frictional characteristic and expand its application range, we adopted the inexpensive zinc-aluminum alloy of ZA27 reinforced by TiC nano-particles to replace the traditional bronze alloys (ZQSn6-6-3) to produce bearing bush. And through its dynamic performance of the finite element analysis to prove particle reinforced ZA27 bearing bush has good dynamic performance.

Analysis on Dynamic Characteristics of HTC100 NC Lathe Bed

2011 ◽  
Vol 328-330 ◽  
pp. 700-703
Author(s):  
Mo Wu Lu ◽  
Guo Ming Zhang ◽  
Wei Qiang Zhao
Keyword(s):  
Modal Analysis ◽  
Performance Indicators ◽  
Natural Frequencies ◽  
Dynamic Performance ◽  
Analysis Method ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
3D Solid ◽  
Modal Vibration ◽  
Ansys Workbench

The processing performance is closely related with dynamic performance and the dynamic performance is one of the most important performance indicators which is affecting the performance and product quality. The machine is affected most by the dynamic performance of machine bed. The modal analysis method is used to analyze the dynamic performance of the machine. In this paper, the modal analysis of lathe bed is conducted. A 3D solid model of HTC100 NC lathe bed is built with SolidWorks. In order to facilitate the finite element analysis, the model of lathe bed is simplified. The modal analysis of lathe bed is calculated with ANSYS Workbench 12. The first six natural frequencies and corresponding modes are obtained through modal analysis of the lathe bed. According to the low-order natural frequency and modal vibration shapes, the rigidity vulnerable area of lathe bed is realized, which provides the reliable theory to improve lathe bed structure.

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