Investigation on the traveling wave and three-dimensional trajectory of motion on the stator of rotational ultrasonic motors

2020 ◽  
Vol 64 (1-4) ◽  
pp. 631-638
Author(s):  
Hucheng Chen ◽  
Wei Han ◽  
Jinhao Qiu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Traveling Wave ◽  
Dimensional Space ◽  
Computational Cost ◽  
Three Dimensional ◽  
Element Model ◽  
Input Voltage ◽  
Ultrasonic Motors ◽  
And Performance

Better understanding of the characteristics of the traveling wave and three-dimensional trajectory related to motion on the surface of the stator is very important for the design and performance improvement of the ultrasonic motors. In this paper, an accurate finite element model of a single stator with a fully coupled piezoelectric layer was established at a moderate computational cost. The finite element model was verified by experimental test at the inverse resonance point. Based on this model, the traveling wave and three-dimensional trajectory of stator surface, including the influence of the input voltage on the phase and amplitude of the displacements in three directions, are investigated. The results show that the trajectory of particles on the stator surface is an ellipse in three-dimensional space due to the phase differences between the three components of displacement in the radial, circumferential and axial directions. The amplitude of radial displacement is about 39.5% of that in the circumferential displacement, which should not be neglected.

Experimental determination and numerical modeling of the stiffness of a fastener

2020 ◽  
Vol 62 (12) ◽  
pp. 1215-1220
Author(s):  
Ahmet Atak
Keyword(s):  
Finite Element ◽  
Numerical Modeling ◽  
Finite Element Model ◽  
Computational Cost ◽  
Three Dimensional ◽  
Sandwich Panels ◽  
High Strength ◽  
Element Model ◽  
Secondary Structures ◽  
Element Analysis

Abstract To reduce the fuel consumption and enhance the flight performance of satellites, it is desirable to employ structural components of low weight, high strength, and high stiffness. Therefore, most primary and secondary structures of satellites are built using sandwich panels. Fasteners, which constitute secondary structures, are normally used as joining parts in different types of inserts such as partially potted, fully potted, and through-thickness inserts. Finite element analysis (FEA) is valuable for predicting the behavior of such primary and secondary structures. However, to obtain more realistic results from such analysis, it is necessary to define suitable fastener stiffness values. To this end, in this study, a method for calculating the fastener stiffness of a fully potted insert for sandwich panels using a finite element model is exemplarily developed and experimentally validated. In addition, a shell modeling is established for various connection types to further save time and reduce the computational cost of the finite element model. Finally, the effects of the fastener stiffness on the numerical analysis results for satellite structural system are evaluated. The two-dimensional (2D) structure modeling method used in this study was found to be as fully sufficient as three-dimensional modeling. In addition to saving time and cost, 2D FEA numerical modeling and prediction could reduce elaborate test costs.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

Reduction of Free-Edge Stress Concentration

1985 ◽  
Vol 52 (4) ◽  
pp. 801-805 ◽  
Author(s):  
P. R. Heyliger ◽  
J. N. Reddy
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Free Edge ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Interlaminar Shear ◽  
Three Dimensional Elasticity

A quasi-three dimensional elasticity formulation and associated finite element model for the stress analysis of symmetric laminates with free-edge cap reinforcement are described. Numerical results are presented to show the effect of the reinforcement on the reduction of free-edge stresses. It is observed that the interlaminar normal stresses are reduced considerably more than the interlaminar shear stresses due to the free-edge reinforcement.

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