The Analyse on Stiffness Model of 3-PPSR Flexible Parallel Robot

2014 ◽  
Vol 716-717 ◽  
pp. 1643-1647
Author(s):  
Yu Liang Luan ◽  
Wei Bin Rong ◽  
Li Ning Sun
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Parallel Robot ◽  
Force Balance ◽  
Element Analysis ◽  
Flexible Hinge ◽  
Stiffness Model ◽  
The Finite Element Analysis ◽  
The Mathematical Model

In order to achieve greater workspace motion, it’s designed a high aspect ratio 3-PPSR flexible parallel robot, driven by a piezoelectric motor, connected by flexible hinges, which has the advantages of simple structure, non singular, seamless, high motion precision. Because of the stiffness of the system directly affecting the motion accuracy, load bearing performance, according to the characteristics of high aspect ratio flexible hinge, It’s established the mathematical model of flexible hinge through finite element method. Using method of integral stiffness, conbined coordination equation with force balance equation, the flexible stiffness model of system is obtained. Finally, through using Ansys, it’s confirmed the validity of the theoretical model by comparing of the theoretical stiffness model results with the finite element analysis of the model results, to provide a reliable guarantee for optimization and analysis of kinematics and dynamics of flexible parallel robot.

Study on a Fast Tool Servo (FTS) Driven by Piezoelectric Ceramic

2014 ◽  
Vol 635-637 ◽  
pp. 1335-1340 ◽  
Author(s):  
Ke Tian Li ◽  
Xin Chen ◽  
Xin Du Chen ◽  
Qiang Liu ◽  
Huan Wei Zhou
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pressure Sensor ◽  
Piezoelectric Ceramic ◽  
Laser Interferometer ◽  
Driving Voltage ◽  
Fast Tool Servo ◽  
Element Analysis ◽  
Flexible Hinge ◽  
Stiffness Model

It is designed a Fast Tool Servo (FTS) device which based on piezoelectric ceramic and jointed by flexible hinge. The flexible hinge has been analyzed and optimized both by the theoretical calculation and finite element analysis; and it has been physically manufactured and tested by means of pressure sensor and laser interferometer. The stiffness model was established. The driving voltage and displacement relationship has been revealed. The results indicate that this FTS system can reach a travel range for 60μm,the frequency response precedes 150Hz within 39μm travel range.

The Finite Element Analysis and Structure Optimizing of the 42MN Flatting Mill’s Higher Beam

2010 ◽  
Vol 145 ◽  
pp. 317-320
Author(s):  
Chun Ming Zhang ◽  
Run Yuan Hao
Keyword(s):  
Mathematical Model ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Design ◽  
Structural Parameters ◽  
Element Model ◽  
Optimum Structure ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Mathematical Model

This text is on the basis of the investigation of the 42MN flatting mill’s higher beam, establishing the flatting mill’s higher beam’s finite element model and the mathematical model which has optimum structure. According to the results of their structure finite element analysis, weaved the relevant procedures and optimized them, obtained ideal structural parameters, this text provide better ideas and ways for the structural design of the flatting mill’s higher beam.

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.

Parametric study of buckling and post-buckling behavior for an aluminum hull structure of a high-aspect-ratio twin hull vessel

2019 ◽  
Vol 234 (1) ◽  
pp. 15-25
Author(s):  
Ebrahim Soleimani ◽  
Mohammad Reza Tabeshpour ◽  
Mohammad Saeed Seif
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Maximum Stress ◽  
Linear Analysis ◽  
Element Analysis ◽  
Axial Forces ◽  
Buckling Behavior ◽  
Hull Structure

Metal plates are essential parts of structures such as ship hulls and offshore oil platforms. These plates are typically under compressive axial forces. Hence, one of the main mechanisms for failure and collapse of such structures is buckling of plates. Thus, for safe and secure design, buckling strength of plates should be evaluated. Finite element analysis techniques are perfect tools for this purpose because of the accuracy and flexibility for performing simulations with different variables. In this study, the strength of aluminum plates has been studied using finite element analysis software and it was tried to study the influence of variables such as initial imperfections, plate thickness and aspect ratio on plate strength. It was found that increase in the imperfection magnitude leads to a decrease in the strength of the plate. This is mostly noticed in thin plates because of the plate’s stiffness reduction. Although the plate’s aspect ratio has a slight effect on strength, it has a considerable impact on the failure mechanism. In order to study a combination of plates and stiffeners buckling behavior, part of a high-aspect-ratio twin hull vessel hull structure is assessed under bending moment. It is observed that longitudinal stiffeners at the bottom of the hull in linear analysis undergo the maximum stress, while in non-linear analysis, the maximum stress is spread along with the structure of the deck and bottom, and neutral axis tolerates the minimum stress.

Investigation of Simple Beam Stiffness Amended Model Based on Finite Element Analysis Results

2011 ◽  
Vol 418-420 ◽  
pp. 143-146
Author(s):  
Yan Cong Li ◽  
Sheng Mou Wan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Orthogonal Test ◽  
Test Method ◽  
Test Program ◽  
Element Analysis ◽  
Single Cylinder ◽  
Stiffness Model ◽  
The Finite Element Analysis ◽  
Orthogonal Test Method

This paper gives an amended stiffness model of simple beam. Single-cylinder hydraulic machine upper beam as an example, amended stiffness model is established. Using orthogonal test method to determine the test program and carrying out finite element analysis to each test program. For the purpose of constructing the amended simply beam stiffness model, the overdetermined equations is established. By solving the overdetermined equation, the amended simply beam stiffness model is obtained. The error between the amended stiffness model results and the finite element analysis is less than 20%, so the amended model has certain validity.

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