Design of Variable Airship Mechanism Based on Finite Element Method

2013 ◽  
Vol 690-693 ◽  
pp. 1899-1902
Author(s):  
Zhi Yuang Xiao ◽  
Mu Qing Yang ◽  
Dong Li Ma ◽  
Zheng Neng Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Design ◽  
Safety Margin ◽  
Research Direction ◽  
The Finite Element Method ◽  
Cross Sectional ◽  
Variation Mechanism ◽  
Important Research Direction ◽  
Element Method

Variable airship is an important research direction because it can overcome the difficulties in climbing phase caused by huge volume, and can also solve the problem of insufficient strength. The requirements of variation bring significant challenges for the airship structural design. In this paper, a radial variation mechanism was proposed based on an existing airship. The mechanism can achieve a continuous variation of the cross-sectional area from 100 to 7.2 percent. The airship structure was analyzed using the finite element method to make sure the airship has a high safety margin in various conditions.

DIRECT CURRENT RESISTIVITY MODELING FOR AXIALLY SYMMETRIC BODIES USING THE FINITE ELEMENT METHOD

Geophysics ◽  
1978 ◽  
Vol 43 (3) ◽  
pp. 550-562 ◽  
Author(s):  
H. M. Bibby
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Apparent Resistivity ◽  
Vertical Axis ◽  
Geothermal Field ◽  
Axially Symmetric ◽  
The Finite Element Method ◽  
Cross Sectional ◽  
Resistivity Anisotropy ◽  
Element Method

The finite element method is used to determine numerically the apparent resistivity anomaly caused by the presence of any body with a vertical axis of symmetry embedded in a uniform half‐space. The potential for a point source of current, and hence the apparent resistivity, is determined in the form of a Fourier series. The use of the finite element method enables certain classes of resistivity anisotropy to be modeled. Several examples of bipole‐dipole apparent resistivity enable us to examine assumptions that are necessarily made when inhomogeneities are approximated by models for which explicit solutions exist for the potential. An application to the Broadlands geothermal field suggests that the horizontal cross‐sectional area of the geothermal reservoir increases with depth, consistent with a decrease in the permeability with depth.

COMPARATIVE ANALYSIS OF THE SYSTEM APM WINMACHINE AND CAE ABAQUS FOR CALCULATING THE STRENGTH OF A WELDED JOINT

2020 ◽  
Vol 5 ◽  
pp. 28-32
Author(s):  
V.V. LEONTYEV ◽  
E.V. KONDRATOVA ◽  
V.P. KOLOMIYCHENKO
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Comparative Analysis ◽  
Strain State ◽  
Safety Margin ◽  
Operating Conditions ◽  
The Finite Element Method ◽  
Stress Strain ◽  
Stress Strain State ◽  
Element Method

Traditional methods for calculating welded joints are based on approximate methods for determining the forces that occur in the joint. This leads to inaccuracies in the definition of stress. In addition, this approach does not allow obtaining a complete picture of the stress-strain state of the joint. All this leads to the need to increase the coefficient of safety margin and, as a result, to increase the cost of construction. The proposed method of calculating the connection using the finite element method allows us to determine the stresses in all the elements of the connection very accurately. This makes it possible to obtain a reliable picture of the stress-strain state of all elements of the connection. As a result, it is possible to reduce the complexity of creating a compound and its mass. The finite element method should be used for calculating critical connections with complex operating conditions. An example of calculating such a connection is considered. A comparative analysis of the results of calculating the t-joint using the arm Joint module Of the WinMachine arm system and the Abaqus finite element package is performed.

Coevolutionary and genetic algorithm based building spatial and structural design

2015 ◽  
Vol 29 (4) ◽  
pp. 351-370 ◽  
Author(s):  
Hèrm Hofmeyer ◽  
Juan Manuel Davila Delgado
Keyword(s):  
Genetic Algorithm ◽  
Finite Element Method ◽  
Finite Element ◽  
Design Process ◽  
Process Simulation ◽  
Structural Design ◽  
The Finite Element Method ◽  
Design Modification ◽  
Spatial Design ◽  
Element Method

AbstractIn this article, two methods to develop and optimize accompanying building spatial and structural designs are compared. The first, a coevolutionary method, applies deterministic procedures, inspired by realistic design processes, to cyclically add a suitable structural design to the input of a spatial design, evaluate and improve the structural design via the finite element method and topology optimization, adjust the spatial design according to the improved structural design, and modify the spatial design such that the initial spatial requirements are fulfilled. The second method uses a genetic algorithm that works on a population of accompanying building spatial and structural designs, using the finite element method for evaluation. If specific performance indicators and spatial requirements are used (i.e., total strain energy, spatial volume, and number of spaces), both methods provide optimized building designs; however, the coevolutionary method yields even better designs in a faster and more direct manner, whereas the genetic algorithm based method provides more design variants. Both methods show that collaborative design, for example, via design modification in one domain (here spatial) to optimize the design in another domain (here structural) can be as effective as monodisciplinary optimization; however, it may need adjustments to avoid the designs becoming progressively unrealistic. Designers are informed of the merits and disadvantages of design process simulation and design instance exploration, whereas scientists learn from a first fully operational and automated method for design process simulation, which is verified with a genetic algorithm and subject to future improvements and extensions in the community.

scholarly journals Research on the settlement of levee and the formation mechanism of pavement crack in heightening and thickening levee engineering

2021 ◽  
Vol 233 ◽  
pp. 03023
Author(s):  
Donghe Ma ◽  
Chun Tan ◽  
Xin Liu ◽  
Peng Wang ◽  
Songling Han
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Formation Mechanism ◽  
Additional Stress ◽  
The Finite Element Method ◽  
Cross Sectional ◽  
Significant Difference ◽  
The Cross ◽  
Element Method

In view of the heightening and thickening levee project which already built, the settlement and deformation on the top of the landside slope of levee and the cracks on the levee were investigated. The finite element method was used to simulated the settlement of the levee. The results show that after heightening and thickening, the thickness of the new filled soil is uneven in the cross-sectional direction of the levee, resulting in a significant difference in the distribution of additional stress and settlement. In addition, the top of the original levee has smaller deformation, while the newly filled levee has larger deformation, which causes uneven settlement on the top of the embankment. The presented results have guiding significance for the settlement and deformation prevention of levee project.

scholarly journals NUMERICAL CALCULATION OF THE STIFFNESS OF THE ELASTIC BLOCK OF THE HYDRAULIC SUPPORT SHELL BY THE FINITE ELEMENT METHOD

2021 ◽  
pp. 22-35
Author(s):  
B.A. Gordeev ◽  
S.N. Ohulkov ◽  
A.N. Osmekhin ◽  
A.S. Plekhov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Shell ◽  
Safety Margin ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Hydraulic Support ◽  
Subsequent Determination ◽  
Stiffness And Damping ◽  
Element Method

The article presents the calculation of the stiffness of the elastic shell of hydraulic supports by the finite element method. This calculation is necessary to know the safety margin of the rubber shell, since with an increase in the resulting vibration, the service life of the MR-hydraulic support decreases, leading to its destruction [1, 2]. The purpose of this study is to calculate and evaluate the maximum shear deformations of the rubber shell of the hydraulic support necessary for the subsequent determination of the stiffness and damping of the hydraulic support at resonant frequencies. The finite element method is used to estimate the maximum shear deformations of the rubber shell of the hydraulic support caused by variable loads.

scholarly journals Finite element method usage in determining pressure distribution of periodontal tissues on maxillary canine as result of orthodontic force

2011 ◽  
Vol 23 (2) ◽  
Author(s):  
E. Elih ◽  
Tono S. Hambali ◽  
Jono Salim ◽  
Endah Mardiati
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Pressure Distribution ◽  
Maximum Pressure ◽  
The Finite Element Method ◽  
Maxillary Canine ◽  
Cross Sectional ◽  
Orthodontic Force ◽  
Periodontal Tissues ◽  
Element Method

The purpose of this study is to obtain data of pressure distribution on canine periodontal tissues due to the orthodontic force generated by various types of motion using the Finite Element Method. The development of digital technology creates a numerical analysis for orthodontic treatment that can be done by performing 3-D reconstruction by scanning the maxillary canine teeth with a CT scan so that 255 cross-sectional images is obtained. 3 D model is then processed using the Finite Element Method to obtain the pressure distribution on the periodontal tissues caused by tipping movements, bodily, torque, roots, rotation, and extrusion. The analysis used was the analysis of qualitative and quantitative analysis. The results showed that the maximum pressure that occurs in the periodontal tissues caused by a variety of movements ranging from 3.3 x 10-3MPa to 2.9 x 10-2 MPa. This indicates that the force exerted on each movement produces maximum pressure that exceeds capillary pressure was 2 x 10-3 MPa.

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