Single Degree of Freedom (SDOF) and finite element analysis of steel column subjected to blast load

2016 ◽  
pp. 805-811
Author(s):  
M Abdallah ◽  
B Osman
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degree Of Freedom ◽  
Blast Load ◽  
Element Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Steel Column

scholarly journals Rocking motion of slender elastic body on rigid floor

1986 ◽  
Vol 19 (1) ◽  
pp. 18-27 ◽  
Author(s):  
T. Ichinose
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Angular Momentum ◽  
Elastic Body ◽  
Vibration Mode ◽  
Simple Relationship ◽  
Element Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Rocking Motion

A single degree of freedom (SDOF) model is presented to describe the rocking behaviour of a slender elastic body on a rigid floor. This model assumes the vibration mode to be a linear combination of flexural and rocking modes. A finite element analysis is also presented, in which following features are observed to support the assumptions of the proposed SDOF model: (1) There exists a simple relationship between the magnitudes of flexural and rocking modes, which relation can be derived from the equilibrium of moment. (2) Angular momentum is conserved at the instances of uplifting and landing.

FOLDING OF A TYPE OF DEPLOYABLE ORIGAMI STRUCTURES

2012 ◽  
Vol 12 (06) ◽  
pp. 1250054 ◽  
Author(s):  
YAO CHEN ◽  
JIAN FENG
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Jacobian Matrix ◽  
Element Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Element Simulation ◽  
Rigid Plane ◽  
Configuration Changes ◽  
Good Agreement

Some types of rigid origami possess specific geometric properties. They have a single degree of freedom, and can experience large configuration changes without cut or being stretched. This study presents a numerical analysis and finite element simulation on the folding behavior of deployable origami structures. Equivalent pin-jointed structures were established, and a Jacobian matrix was formed to constrain the internal mechanisms in each rigid plane. A nonlinear iterative algorithm was formulated for predicting the folding behavior. The augmented compatibility matrix was updated at each step for correcting the incompatible strains. Subsequently, finite element simulations on the deployable origami structures were carried out. Specifically, two types of generalized deployable origami structures combined by basic parts were studied, with some key parameters considered. It is concluded that, compared with the theoretical values, both the solutions obtained by the nonlinear algorithm and finite element analysis are in good agreement, the proposed method can well predict the folding behavior of the origami structures, and the error of the numerical results increases with the increase of the primary angle.

Study on Block Structure Optimization of Single Degree of Freedom Crankshaft Fillet Rolling Machine

2013 ◽  
Vol 655-657 ◽  
pp. 222-226
Author(s):  
Shao Jun Han ◽  
Chao Chen ◽  
Xiong Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Block Structure ◽  
Structure Optimization ◽  
Yield Limit ◽  
Analysis Software ◽  
Element Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree

Made a static analysis of the SDOF rolling arm of the crankshaft rolling mechanism by using ANSYS finite element analysis software, obtained stress distribution and deformation of the rolling arm in clamping condition, then optimized the size of the rolling arm. Achieve the purpose of reducing the weight of the rolling arm,within the yield limit of the material.

Behavior of Congruent Tessellation Stacks Under Torsional Loading

2016 ◽  
Author(s):  
Yves Klett ◽  
Fabian Muhs ◽  
Peter Middendorf
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Degree Of Freedom ◽  
Simple Solution ◽  
Torsional Loading ◽  
Element Analysis ◽  
Torsional Loads ◽  
Structural Mechanisms ◽  
Potential Use

The combination of several layers of rigidly foldable tessellations into can produce cellular material stacks with interesting properties, especially if the resulting stack preserves the mobility of its constituting layers. To achieve this, the construction of functional joining and hinging concepts need to be developed. This paper presents a simple solution to effectively joining different 1-DOF (degree of freedom) tessellation layers. The mechanical properties of the resulting structures under torsional loads are evaluated using finite element analysis, and their potential use as structural mechanisms is discussed.

Finite Element Analysis on the Blast Resistant Performance of Multibarrel Tube-Confined Concrete Column in Different Cross-Sections

2013 ◽  
Vol 721 ◽  
pp. 545-550
Author(s):  
Sai Wu ◽  
Jun Hai Zhao ◽  
Er Gang Xiong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Detonation Wave ◽  
Cross Section ◽  
Cross Sections ◽  
Failure Modes ◽  
Circular Cross Section ◽  
Blast Load ◽  
Element Analysis ◽  
The Impact

Based on the finite element analysis software ANSYS/LS-DYNA, this paper numerically analyzed the dynamic performance of MTCCCs with different cross sections under blast load, followed by the study and comparison on the differences of the detonation wave propagation and failure modes between the columns in circular cross section and square cross section. The results show: The blast resistant performance of the circular component is more superior than the square component for its better aerodynamic shape that can greatly reduce the impact of the detonation wave on the column; The main difference of the failure modes between the circular and square cross-sectional components under blast load lies in the different failure mode of the outer steel tube. The simulation results in this paper can provide some references for the blast resisting design of MTCCCs.

The Equivalence Proof of Two Methods for Foundation Excitation

2014 ◽  
Vol 638-640 ◽  
pp. 684-689
Author(s):  
Yun Ying Ma ◽  
Jin Duan ◽  
Hong Shao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Lagrange Multiplier ◽  
Present Theory ◽  
Degree Of Freedom ◽  
Multiplier Method ◽  
Element Analysis ◽  
Numerical Example ◽  
The Finite Element Analysis ◽  
Equivalence Proof

In this paper, the two methods for the finite element analysis of foundation excitation would be proved mathematically equivalent. Although the two methods, i.e. the method of degree-of-freedom transformation and the Lagrange multiplier method, are absolutely different in appearance, but their mathematical essence would be proved completely identical. In other words, although the equations derived from the two methods have different degree-of-freedoms, i.e. the latter much more than the former, while in essence they could be deduced from each other and vice versa. And finally a numerical example will be presented and discussed to demonstrate the correctness of the present theory.

Proposal of 5-phase 3-degree-of-freedom spherical actuator with auxiliary poles

2020 ◽  
pp. 1-12
Author(s):  
Kazuaki Takahara ◽  
Katsuhiro Hirata ◽  
Noboru Niguchi ◽  
Tomoya Amazutsumi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Degree Of Freedom ◽  
Phase 3 ◽  
Element Analysis ◽  
Spherical Actuator

Multi-Degree-of-Freedom (Multi-DOF) actuating systems are usually composed of several single-DOF motors, which results in large, heavy and complicated structures. In order to solve these problems, various multi-DOF spherical actuators have been actively studied. However, a large number of current phases are required in the spherical actuator. In this paper, in order to reduce the number of current phases, a 3-DOF spherical actuator with auxiliary poles which is driven using 5-phase currents is proposed. Finally, the torque characteristics of the proposed actuator are evaluated through 3-D finite element analysis.

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