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.

Identification Method of Dynamic Characteristics of Joints in Jointed Structures

2013 ◽  
Vol 7 (2) ◽  
pp. 221-227
Author(s):  
Shinji Shimizu ◽  
◽  
Yoshiaki Kabaya ◽  
Haruhisa Sakamoto ◽  
Kenichi Yamashita ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Transfer Function ◽  
Dynamic Characteristic ◽  
Dynamic Characteristics ◽  
Vibration Mode ◽  
Joint Model ◽  
Characteristic Parameters ◽  
Element Analysis ◽  
Spring Element

In this paper, we propose a method of identifying the dynamic characteristics of joints in jointed structures. We first consider a joint model for finite element analysis. We then propose, based on the consideration, a method of identifying dynamic characteristic parameters of the joint, such as the spring stiffness and damping coefficient, with the joint model. As a result, we obtain a joint model with the spring and damping elements in vertical and tangential directions between a pair of nodes with changeable numbers and locations. The number and location of these elements can be determined so that the vibration mode and the inertance transfer function of the jointed structure obtained from finite element analysis with infinite stiffness of the spring element agree with those of the structure without joints. In addition, we identify the dynamic characteristic parameters of the joint so the experimental inertance transfer function and vibration mode agree with those obtained from the finite element analysis.

scholarly journals A novel fixable cylindrical ultrasonic motor

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401982998 ◽  
Author(s):  
Dong Sun ◽  
Yu-juan Tang ◽  
Jiong Wang ◽  
Xin-jie Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Vibration Mode ◽  
Ultrasonic Motor ◽  
Maximal Velocity ◽  
Element Analysis ◽  
Inner Radius ◽  
The Finite Element Analysis ◽  
Working Principle ◽  
Output Characteristics

A novel cylindrical ultrasonic motor easy to be fixed is proposed in this article. There are threaded holes on the bottom of stator used for fixing, distinguishing it from other cylindrical stators. The bottom is machined as a round lug boss. Its radius is smaller than the inner radius of the stator in order not to affect the excitation of vibration mode. The finite element analysis was accomplished to verify the working principle. Based on the analysis, a prototype was fabricated and measured. The mechanical output characteristics were obtained by experiments. The maximal velocity of the proposed motor is 170 r/min at the operating frequency of 31.6 kHz.

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