Optimization Method of Hoisting Points Schemes Using Strain Energy Criterion

2011 ◽  
Vol 88-89 ◽  
pp. 583-586
Author(s):  
Shun Guo Li ◽  
Hui Li
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Energy Criterion ◽  
Element Model ◽  
Optimization Method ◽  
Optimization Analysis ◽  
Element Analysis ◽  
Single Target ◽  
Steel Truss ◽  
Calculation Code

The optimization method of hoisting point’s schemes using strain energy criterion was studied in this paper. Firstly, the finite element model of complex steel truss hoisting was established and optimization analysis of hoisting point’s schemes for complex steel truss hoisting using strain energy criterion was accomplished. The calculation code which can make finite element analysis and optimization analysis of lifting point’s schemes based on strain energy criterion automatically. Then, lifting point’s schemes of complex steel truss hoisting were analyzed with calculation code mentioned above. The results indicate that, the optimization index using strain energy criterion is just strain energy criterion which is a more comprehensive and unidirectional index. Optimization analysis based on strain energy criterion changes optimization analysis of the lifting points schemes for complex steel truss hoisting from multi-target optimization into single-target optimization. The case study shows that this method is practicable and reliable and have good application prospect in hoisting points schemes optimization analysis with application to complex steel truss hoisting.

scholarly journals A topology optimization method of robot lightweight design based on the finite element model of assembly and its applications

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042093648
Author(s):  
Liansen Sha ◽  
Andi Lin ◽  
Xinqiao Zhao ◽  
Shaolong Kuang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Lightweight Design ◽  
Element Model ◽  
Optimization Method ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Upper Limb Exoskeleton ◽  
Topology Optimization Method

Topology optimization is a widely used lightweight design method for structural design of the collaborative robot. In this article, a topology optimization method for the robot lightweight design is proposed based on finite element analysis of the assembly so as to get the minimized weight and to avoid the stress analysis distortion phenomenon that compared the conventional topology optimization method by adding equivalent confining forces at the analyzed part’s boundary. For this method, the stress and deformation of the robot’s parts are calculated based on the finite element analysis of the assembly model. Then, the structure of the parts is redesigned with the goal of minimized mass and the constraint of maximum displacement of the robot’s end by topology optimization. The proposed method has the advantages of a better lightweight effect compared with the conventional one, which is demonstrated by a simple two-linkage robot lightweight design. Finally, the method is applied on a 5 degree of freedom upper-limb exoskeleton robot for lightweight design. Results show that there is a 10.4% reduction of the mass compared with the conventional method.

Dynamical Limit of Compliant Lever Mechanisms

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Michele Bonaldi ◽  
Mario Saraceni ◽  
Enrico Serra
Keyword(s):  
Finite Element ◽  
Multiobjective Optimization ◽  
Elastic Constants ◽  
Upper Bound ◽  
Strain Energy ◽  
Mechanical Energy ◽  
Element Model ◽  
Positive Definite ◽  
Optimization Analysis ◽  
Energy Conservation Principle

The application of the mechanical energy conservation principle sets a dynamical limit to the performances of compliant lever mechanisms endowed with a positive definite strain energy. The limit applies to every linear compliant lever and is given as an upper bound on the product between the static effective gain of the device and its bandwidth. The relevant parameters of this relation are determined only by the structures surrounding the device and not by its design. This result is obtained on the basis of a linear two-port model, with coefficients determined by the static elastic constants of the device. The model and the dynamical limit are validated by multiobjective optimization analysis interfaced with a finite element model of a practical mechanism.

scholarly journals Finite Element Analysis of Bend Test of Sandwich Structures Using Strain Energy Based Homogenization Method

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Hassan Ijaz ◽  
Waqas Saleem ◽  
Muhammad Zain-ul-Abdein ◽  
Tarek Mabrouki ◽  
Saeed Rubaiee ◽  
...  
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Effective Properties ◽  
Sandwich Structures ◽  
Sandwich Beam ◽  
Energy Criterion ◽  
Homogenization Method ◽  
Fe Analysis ◽  
Bend Test ◽  
Element Analysis

The purpose of this article is to present a simplified methodology for analysis of sandwich structures using the homogenization method. This methodology is based upon the strain energy criterion. Normally, sandwich structures are composed of hexagonal core and face sheets and a complete and complex hexagonal core is modeled for finite element (FE) structural analysis. In the present work, the hexagonal core is replaced by a simple equivalent volume for FE analysis. The properties of an equivalent volume were calculated by taking a single representative cell for the entire core structure and the analysis was performed to determine the effective elastic orthotropic modulus of the equivalent volume. Since each elemental cell of the hexagonal core repeats itself within the in-plane direction, periodic boundary conditions were applied to the single cell to obtain the more realistic values of effective modulus. A sandwich beam was then modeled using determined effective properties. 3D FE analysis of Three- and Four-Point Bend Tests (3PBT and 4PBT) for sandwich structures having an equivalent polypropylene honeycomb core and Glass Fiber Reinforced Plastic (GFRP) composite face sheets are performed in the present study. The authenticity of the proposed methodology has been verified by comparing the simulation results with the experimental bend test results on hexagonal core sandwich beams.

Analysis on Spindle of 2MW Wind Generator

2011 ◽  
Vol 121-126 ◽  
pp. 2532-2536
Author(s):  
Jia Hong Zheng ◽  
Min Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Model ◽  
Optimal Model ◽  
Optimization Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Mathematical Model ◽  
The Finite Element Model ◽  
Complete Optimization

The model of the spindle was made while the related characteristics and parameters were analysising,and then it was inducted in ANSYS finite element analysis software. Through carrying the constraint on the finite element model, the spindle was completed to realize the finite element analysis. At last, the model was inducted in MATLAB to establish the optimal model, through the mathematical model ,it was realised to complete optimization analysis.

Finite Element Analysis and Topology Optimization for the Gantry Milling Machine Column Structure

2011 ◽  
Vol 80-81 ◽  
pp. 1016-1020 ◽  
Author(s):  
Wei Huang ◽  
Chang Song Ou ◽  
Hai Man Lu ◽  
Zheng Liang Xie
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Topology Optimization ◽  
Parametric Design ◽  
Design Method ◽  
Element Model ◽  
Optimization Method ◽  
Milling Machine ◽  
Element Analysis ◽  
Column Structure

According to the limit working conditions of the gantry milling machine column, this paper adopts Parametric Design Language APDL to set up finite element model and make finite element analysis. Based on the analysis, the topology optimization method of column structure is proposed, and the optimal design method is established to minimize the weight. The finite element analysis is made again to analyze the rearranged column structure. Compared with the design made through experience, optimally designed column can reduce 10% weight. And the critical displacement and maximum stress are not affected.

Finite Element Analysis and Optimal Design of Commercial Vehicle Drive Axle Housing

2013 ◽  
Vol 816-817 ◽  
pp. 782-785 ◽  
Author(s):  
Bing Bing Zhou ◽  
Hui Lin Li ◽  
Qian Liu
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Commercial Vehicle ◽  
Element Model ◽  
Optimization Method ◽  
Bench Test ◽  
Dynamics Analysis ◽  
Element Analysis ◽  
Drive Axle ◽  
Drive Axle Housing

In order to solve the heavy mass problem of the commercial vehicle drive axle housing, the structure of axle housing is optimized with finite element method. At first, the parametric finite element model of axle housing is built by using ANSYS software, and the dynamic response characteristics of axle housing are obtained with transient dynamics analysis. The dynamic analysis results show that strength and stiffness of axle housing can satisfy design criteria very well. Then the fatigue life of axle housing are predicted based on the dynamics analysis, and results show that the fatigue dangerous regions occur on the spring seats. Finally, the structure optimization of axle housing is done aimed at lightweight with goal drive optimization method, and the fatigue life of optimized axle housing are verified with FEA and bench test. The results of verification by both FEA and test show that the optimized axle housing has apparent lightweight effects with its fatigue life meeting design requirements.

Harmonic Convergence Estimation Through Strain Energy Superconvergence

2016 ◽  
Vol 138 (10) ◽  
Author(s):  
Alexander A. Kaszynski ◽  
Joseph A. Beck ◽  
Jeffrey M. Brown
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Response Prediction ◽  
Element Model ◽  
Accurate Estimate ◽  
Element Analysis ◽  
Modeling Process ◽  
Harmonic Convergence ◽  
Convergence Study ◽  
Polyharmonic Splines

Grid convergence in finite element analysis (FEA), despite a wide variety of tools available to date, remains an elusive and challenging task. Due to the complex and time-consuming process of remeshing and solving the finite element model (FEM), convergence studies can be a part of the most arduous portion of the modeling process and can even be impossible with FEMs unassociated with CAD. Existing a posteriori methods, such as relative error in the energy norm, provide a near arbitrary indication of the model convergence for eigenfrequencies. This paper proposes a new approach to evaluate the harmonic convergence of an existing model without conducting a convergence study. Strain energy superconvergence (SES) takes advantage of superconvergence points within a FEM and accurately recovers the strain energy within the model using polyharmonic splines, thus providing a more accurate estimate of the system's eigenfrequencies without modification of the FEM. Accurate eigenfrequencies are critical for designing for airfoil resonance avoidance and mistuned rotor response prediction. Traditional error estimation strategies fail to capture harmonic convergence as effectively as SES, potentially leading to a less accurate airfoil resonance and rotor mistuning prediction.

Finite Element Analysis and Deformation Homogeneity Optimization of Constrained Groove Pressing

2013 ◽  
Vol 278-280 ◽  
pp. 505-513
Author(s):  
Zong Shen Wang ◽  
Yan Jin Guan ◽  
Li Bin Song ◽  
Ping Liang
Keyword(s):  
Finite Element ◽  
Signal To Noise Ratio ◽  
Element Model ◽  
Optimization Method ◽  
Processing Parameters ◽  
Equivalent Strain ◽  
Groove Width ◽  
Taguchi Optimization ◽  
Element Analysis ◽  
Deformation Homogeneity

Improvement of materials properties induced by constrained groove pressing (CGP) depends largely on deformation homogeneity. Utilizing commercial software DEFORM-3D, a finite element model of multi-pass CGP was established. The distribution and homogeneity evolution of equivalent strain ware analyzed in detail. Based on Taguchi optimization method, the influence of processing parameters (such as groove width, groove angle, friction coefficient and deformation rate) on strain homogeneity was studied numerically and systematically. Within a certain range, the optimum parameter combination is obtained by means of signal to noise ratio analysis. The inhomogeneity factor of the optimum model decreases by about 50 %. The average accumulative equivalent strain is almost twice that of the initial model. Analysis of variance shows that groove angle and groove width are the two most important parameters and effect of friction between dies and sample should not be neglected.

Harmonic Convergence Estimation Through Strain Energy Superconvergence

2015 ◽  
Author(s):  
Alexander A. Kaszynski ◽  
Joseph A. Beck ◽  
Jeffrey M. Brown
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Response Prediction ◽  
Element Model ◽  
Accurate Estimate ◽  
Element Analysis ◽  
Modeling Process ◽  
Harmonic Convergence ◽  
Convergence Study ◽  
Polyharmonic Splines

Grid convergence in finite element analysis, despite a wide variety of tools available to date, remains an elusive and challenging task. Due to the complex and time consuming process of remeshing and solving the finite element model (FEM), convergence studies can be part of the most arduous portion of the modeling process and can even be impossible with FEMs unassociated with CAD. Existing a posteriori methods, such as relative error in the energy norm, provide a near arbitrary indication of the model convergence for eigenfrequencies. This paper proposes a new approach to evaluate the harmonic convergence of an existing model without conducting a convergence study. Strain energy superconvergence takes advantage of superconvergence points within a FEM and accurately recovers the strain energy within the model using polyharmonic splines, thus providing a more accurate estimate of the system’s eigenfrequencies without modification of the FEM. Accurate eigenfrequencies are critical for designing for airfoil resonance avoidance and mistuned rotor response prediction. Traditional error estimation strategies fail to capture harmonic convergence as effectively as SES, potentially leading to a less accurate airfoil resonance and rotor mistuning prediction.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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