Finite Element Analysis of Structures with Interval Parameters

2007 ◽  
Vol 23 (1) ◽  
pp. 79-85 ◽  
Author(s):  
W. Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Responses ◽  
Structural Parameters ◽  
Mean Value ◽  
Truss Structures ◽  
Element Analysis ◽  
Interval Change ◽  
Interval Parameters ◽  
Factor Method

AbstractThis paper present a new method called the interval factor method for the finite element analysis of truss structures with interval parameters. Using the interval factor method, the structural parameters and loads can be considered as interval variables, and the structural stiffness matrix can then be divided into the product of two parts corresponding to its deterministic value and the interval factors. The computational expressions for lower and upper bounds, mean value and interval change ratio of structural placement and stress responses are derived from the static governing equations by means of the interval operations. The effect of the uncertainty of the structural parameters and loads on the structural static responses is demonstrated by truss structures.

Design of a Single-Acting Constant-Force Actuator Based on Dielectric Elastomers

2008 ◽  
Author(s):  
Giovanni Berselli ◽  
Rocco Vertechy ◽  
Gabriele Vassura ◽  
Vincenzo Parenti Castelli
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compliant Mechanism ◽  
Structural Parameters ◽  
Dielectric Elastomer ◽  
Constant Force ◽  
Element Analysis ◽  
Body Model ◽  
Rigid Body Model ◽  
Supporting Frame

The interest in actuators based on dielectric elastomer films as a promising technology in robotic and mechatronic applications is increasing. The overall actuator performances are influenced by the design of both the active film and the film supporting frame. This paper presents a single-acting actuator which is capable of supplying a constant force over a given range of motion. The actuator is obtained by coupling a rectangular film of silicone dielectric elastomer with a monolithic frame designed to suitably modify the force generated by the dielectric elastomer film. The frame is a fully compliant mechanism whose main structural parameters are calculated using a pseudo-rigid-body model and then verified by finite element analysis. Simulations show promising performance of the proposed actuator.

scholarly journals Stiffness prediction for bolted moment-connections in cold-formed steel trusses

2020 ◽  
Vol 41 (1) ◽  
Author(s):  
Apai Benchaphong ◽  
Rattanasak Hongthong ◽  
Sutera Benchanukrom ◽  
Nirut Konkong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Method ◽  
Truss Structures ◽  
Rotational Stiffness ◽  
Element Analysis ◽  
Moment Connection ◽  
Rigid Connection ◽  
Cold Formed Steel ◽  
Steel Trusses

The purpose of this research was to study the behavior of cold-formed steel cantilever truss structures. A cantilever truss structure and bolt-moment connection were tested and verified by the 3D-finite element model. The verification results showed a good correlation between an experimental test and finite element analysis. An analytical method for elastic rotational stiffness of bolt-moment connection was proposed. The equation proposed in the analytical method was used to approximate the elastic rotational stiffness of the bolt group connection, and was also applied to the Richard-Abbott model for generating the nonlinear moment-rotation curve which modeled the semi-rigid connection stiffness. The 2D-finite element analysis was applied to study the behavior of the truss connection, caused by semi-rigid connection stiffness which caused a change of force to the truss elements. The results showed that the force in the structural members increased by between 13.62%-74.32% of the axial forces, and the bending moment decreased by between 33.05%-100%. These results strongly suggest that the semi-rigid connection between cold-formed steel cantilever truss structures should be considered in structural analysis to achieve optimum design, acknowledging this as the real behavior of the structure.

scholarly journals Finite-element analysis and structure optimization of X-O composite seal of cone bit

2020 ◽  
Vol 12 (5) ◽  
pp. 168781402091868
Author(s):  
Shuang Jing ◽  
Anle Mu ◽  
Yi Zhou ◽  
Ling Xie
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Parameters ◽  
Structure Optimization ◽  
Seal Ring ◽  
Test Results ◽  
Element Analysis ◽  
Root Cause ◽  
Sealing Performance ◽  
Distribution Of Stress

The seal is the key part of the cone bit. To reduce the failure probability, a new seal was designed and studied. The sealing performance and structure optimization of the X-O composite seal was analyzed and compared by finite-element analysis. The stress and contact pressure were analyzed to establish the main structural parameters that affect sealing performance and the direction of the structural optimization. By optimizing these structural parameters, including the height, and the radial and axial arc radii, an optimized structure is obtained. The results show that (1) the X-O composite seal can meet the seal requirement, the excessive height of the X seal ring is the root cause of the uneven distribution of stress, pressure, and distortion. (2) A new seal structure is obtained, the distribution of pressure and stress is reasonable and even, and the values of stress and pressure are reduced to avoid distortion and reduce the wear. Finally, the field test results of the X-O composite seal of cone bit showed that the service life of the bit bearing increased by 16% on average and the drilling efficiency increased by 11% on average compared with the original cone bit with the O seal ring.

Finite Element Analysis of Pressure Device in Die-Cutting Based on the ANSYS Workbench

2010 ◽  
Vol 156-157 ◽  
pp. 1195-1198
Author(s):  
Shao Hua Shen ◽  
Xiang Dong Shi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Properties ◽  
Structural Parameters ◽  
Structure Type ◽  
Scientific Basis ◽  
Element Analysis ◽  
Calculated Stress ◽  
Stress And Strain Distribution ◽  
Ansys Workbench

The important component--- pressure device in die-cutting is analyzed by Solidworks and ANSYS Workbench. With analyzing the structure of the pressure device, some simplification is made, and the tool of draft mirror and feature mirror is often used in building the model in the Solidworks. Loads of the pressure device in different load conditions are analyzed and calculated. Stress and displacement of the pressure device are plotted after static finite element analysis. Its stress is analyzed by ANSYS. Stress and strain distribution is found. Which can provides mechanical simulation for the design of the pressure device, and provides scientific basis for selecting structure type, deciding structural parameters, increasing static and dynamic properties, reducing manufacture cost of the integral body of the pressure device.

Research on PET Beer Bottle Structural Parameters and it’s Strength

2013 ◽  
Vol 641-642 ◽  
pp. 488-491
Author(s):  
Wei Yuan ◽  
Li Hua Xie ◽  
Gai Mei Zhang ◽  
Da Zhi Liao ◽  
Jian Dong Lu
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Internal Pressure ◽  
Structural Parameters ◽  
Analysis Software ◽  
Element Analysis ◽  
Main Factors ◽  
Different Thickness

According to the formula of the resistance to internal pressure, the main factors of the strength of the beer bottles are analyzed. Using ANSYS finite element analysis software, PET beer bottles damaged boundary conditions are determined. PET beer bottle model is established, and have the stress analysis. The internal pressure and the bottle top pressure are applied on PET beer bottles. PET beer bottles strain is analyzed in two loads with different thickness and different bottle diameter. Thickness and bottle diameter influence of the mechanical properties of PET beer bottles are obtained. It provides a method and basis of the structure to optimize the design of PET beer bottles.

Finite Element Analysis and Structural Parameters Optimization of Piezoelectric Vibration Energy Harvester

2010 ◽  
Vol 44-47 ◽  
pp. 1465-1469
Author(s):  
Ai Min Hu ◽  
Ming Long
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Frequency ◽  
Energy Harvester ◽  
Structural Parameters ◽  
Vibration Energy ◽  
Element Analysis ◽  
Vibration Energy Harvester ◽  
Piezoelectric Vibration Energy Harvester ◽  
Piezoelectric Vibration

The working principle of piezoelectric vibration energy harvester is described. A piezoelectric cantilever and mass composite structure is proposed to harvest vibration energy in resonance mode, and the mass is added on the edge of the cantilever to decrease the natural frequency of the whole structure. The finite element analysis was carried out on the composite structure using the ANSYS software. The displacement results were obtained by structural analysis, and the first order natural frequency was also obtained by modal analysis. Finally, the influence rules among the structural parameters, such as length and width of the cantilever, length and thickness of the mass and width of the PZT, and the natural frequency, piezoelectric output voltage are discussed in detail. Finally, the optimal structure of the harvester is obtained.

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