Effect of the Rotor/Stator Interface Condition Including Contact Type, Geometry, and Material on the Performance of Ultrasonic Motor

1994 ◽  
Vol 116 (4) ◽  
pp. 726-732 ◽  
Author(s):  
Takashi Maeno ◽  
David B. Bogy
Keyword(s):  
Motor Performance ◽  
Three Dimensional ◽  
Dynamic Contact ◽  
Ultrasonic Motor ◽  
Interface Condition ◽  
Contact Interface ◽  
Element Analysis ◽  
Contact Type ◽  
Ultrasonic Motors ◽  
Rotor Model

The purpose of this paper is to show the dynamic contact characteristics and the motor performance of several types of ultrasonic motors. First, we compare the performance of “intermittent” and “traveling” contact type ultrasonic motors by using the locally deforming rotor model. We show that the motor performances are the same when the shape of the stator’s amplitude, and the rotor’s interpenetration are the same. Then, we show that the performance of these two types of motors are different according to the effects of inertia and actual three dimensional displacement by using the FE (finite element) analysis. Finally, the effects of the teeth and a surface layer at the contact interface on the performance of the ultrasonic motor, including T-N (torque-speed) characteristics and friction loss, are analyzed.

Effects of Ultrasonic Motor Stator Teeth Height on Start Reliability

2015 ◽  
Vol 0 (0) ◽  
Author(s):  
Wei Zheng ◽  
Jing-Liang Zhou ◽  
Yu-Zhen Ruan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Traveling Wave ◽  
Ultrasonic Motor ◽  
Wave Type ◽  
Element Analysis ◽  
Factors Affecting ◽  
Ultrasonic Motors ◽  
Wide Range ◽  
New Type

AbstractAs a new type of motor, the traveling wave type rotary ultrasonic motors (TRUM) have a wide range of applications. However, the friction between stator and rotor leads to its poor start reliability, which retards the progress of application of ultrasonic motors. Sometimes TRUMs which are widely used cannot start after storage. Height of tooth of the ultrasonic motor’s stator is one of the factors affecting TRUM’s start stabilizing. In this paper, combined with the ultrasonic motor running mechanism, the factors that affect TRUM’s start reliability are studied. Model of ultrasonic motor stator tooth height is analyzed by finite element analysis (FEA). Five TRUMs with different tooth heights are fabricated and measured. A TRUM with 1.85 mm tooth height can start properly in humidity 90%, but ultrasonic motors with 1.8–1.9 mm tooth height cannot start properly under the same conditions.

Contact Between Elastic Bodies With an Elliptic Contact Interface in Torsion

1997 ◽  
Vol 64 (1) ◽  
pp. 144-148 ◽  
Author(s):  
J. F. Cuttino ◽  
T. A. Dow
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
The Other ◽  
Contact Interface ◽  
Element Analysis ◽  
Elastic Bodies ◽  
Torque Generation ◽  
Elliptical Contact ◽  
Elliptic Contact

When two elastic three-dimensional bodies of specified radii come into contact, Hertzian forces at the interface result in the formation of an elliptical contact area. The rotation of one body relative to the other about an axis normal to the contact induces a nonlinear torque due to the progression of sliding in the contact interface. Using finite element analysis, a relationship describing torsional compliance with slip is presented for two elastic bodies with an elliptic contact interface under pure twist. The effect of changing material and geometric parameters is studied, and the relationships between torque generation and angle are defined with respect to these nondimensionalized parameters.

scholarly journals Response of piles to inclined uplift loads

2007 ◽  
pp. 419-435
Author(s):  
Hussein Mroueh ◽  
Isam Shahrour
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Interface Condition ◽  
Critical Depth ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Axial Response ◽  
Three Dimensional Finite Element

This paper presents a three-dimensional finite element analysis of the response of piles to inclined uplift loads. It deals with the influence of the soil-pile interface on this response. Calculations are carried out for several load’s inclinations and different conditions at the soil-pile interface. The concept of the “critical depth” at the soil-pile interface is investigated. Analyses show that the lateral behaviour of the pile is independent from both the load’s inclination and the interface condition, while both the load’s inclination and the soil-pile interface largely affect the axial response of piles.

scholarly journals Modal Analysis for a Rod-Fastened Rotor considering Contact Effect Based on Double Fractal Model

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yang Liu ◽  
Qi Yuan ◽  
Pu Li ◽  
Guangyu Zhu
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
Fractal Dimensions ◽  
Fractal Model ◽  
Structural Function ◽  
Flexural Stiffness ◽  
Contact Interface ◽  
Element Analysis ◽  
Fractal Roughness ◽  
Three Dimensional Finite Element

The rod-fastened rotor is the core component of the gas turbine. It comprises several discs and tie rods. The flexural stiffness of the contact interface is the key factor for rotordynamic analysis. The contact interfaces of the discs are usually manufactured by grinding. The measured contour curve of the contact interfaces of an experimental rod-fastened rotor is analyzed by the structural function method, which shows that the contact interfaces can be well described by the double fractal model with fractal dimensions D1 and D2 and the fractal roughness parameters G1 and G2. The Hertz model is used to analyze the contact of the single asperity on the contact interface. On this basis, the flexural stiffness of the contact interface considering the pretightening force and the bending moment is derived. Modal frequencies of the experimental rod-fastened rotor under different pretightening forces and the bending moment (caused by gravity) are obtained by three-dimensional finite element analysis and experimental modal tests. It is observed that the modal frequencies increase with the nominal pressure of the contact interface, and the experimental results are consistent with the calculated results.

FE Analysis and LDA Measurement of the Dynamic Rotor/Stator Contact in a Ring-Type Ultrasonic Motor

1993 ◽  
Vol 115 (4) ◽  
pp. 625-631 ◽  
Author(s):  
Takashi Maeno ◽  
David B. Bogy
Keyword(s):  
Natural Frequencies ◽  
Dynamic Contact ◽  
Ultrasonic Motor ◽  
Inertial Effects ◽  
Dynamic Contact Problem ◽  
Element Analysis ◽  
Frictional Loss ◽  
Ring Type ◽  
Lda Measurement ◽  
Good Agreement

We study the dynamic contact characteristics between the rotor and stator of a ring-type ultrasonic motor by measurement and simulation. First, we measure the tangential and normal velocities and displacements of the rotor/stator interface using a LDA (laser Doppler anemometer). It is especially suitable for our measurement since it directly measures the velocity with high precision. Next, we solve the dynamic contact problem of the rotor/stator interface by use of finite element analysis taking into consideration inertial effects and replacing the ring by an equivalent straight model of the rotor/stator. The calculated tangential and normal displacements and velocities of the rotor/stator are in good agreement with the measured ones. The effect of inertia was studied by changing the density of the rotor in the calculation. When the rotor’s density is decreased to produce smaller natural frequencies, the velocity fluctuation and the frictional loss increase.

scholarly journals Efficiency Model for Traveling Wave-Type Ultrasonic Motors Based on Contact Variables and Preload

Actuators ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 158
Author(s):  
Haoyu Sun ◽  
Hao Yin ◽  
Jiang Liu ◽  
Xilong Zhang
Keyword(s):  
Present Model ◽  
Ultrasonic Motor ◽  
Operating Conditions ◽  
Contact Interface ◽  
The Real ◽  
Ultrasonic Motors ◽  
Proposed Model ◽  
On Line ◽  
The Relationship ◽  
Feedback Voltage

The contact interface variables are difficult to measure for an ultrasonic motor. When the ultrasonic motor works under different preloads, the error between the traditional efficiency model and the real output is quite large. In order to solve these two problems, we propose a novel efficiency model. It takes measured preload and the feedback voltage data as the input, which may offer better accuracy and on-line ability. Firstly, the effect of the preload on the drive characteristics is investigated, and the relationship between preload and the change in motor energy input is analyzed. Secondly, a contact model based on measured preload and feedback voltage is built, providing a more accurate description of the contact variables. Finally, an efficiency model was developed with a new composite stator structure. A preload test rig for a 60 mm ultrasonic motor is built and real operating conditions are measured. The results show that the correlation coefficient of the present model is 0.991, larger than 0.925 of the conventional model. The proposed model is more consistent with the real working conditions for the motor.

Improved understanding of geogrid response to pullout loading: insights from three-dimensional finite-element analysis

2020 ◽  
Vol 57 (2) ◽  
pp. 277-293 ◽  
Author(s):  
Mahmoud G. Hussein ◽  
Mohamed A. Meguid
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Reinforced Soil ◽  
Soil Reinforcement ◽  
Interface Condition ◽  
Element Analysis ◽  
Analysis And Design ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Soil reinforcement has rapidly become one of the most common soil improvement techniques used in geotechnical engineering. Understanding the behavior of a geogrid under pullout loading is essential for the analysis and design of reinforced soil systems. The overall behavior of reinforced soils is generally dependent on the properties of the geogrid material, the backfill soil, and the interface condition. Modeling the three-dimensional aspects of soil–geogrid interaction under pullout loading condition is numerically challenging and requires special consideration of the different modes of resistance that contribute to the pullout capacity of the geogrid reinforcement. This study describes the results of a three-dimensional finite-element analysis that has been developed to investigate the behavior of a biaxial geogrid embedded in granular backfill material and subjected to pullout loading. The modeling approach considers the noncontinuous nature of the geogrid geometry and the elastoplastic response of the geogrid material. Model validation is performed by simulating laboratory-size pullout test and comparing the experimental data with the analytical as well as numerically calculated results. The detailed behavior of the geogrid and the surrounding backfill is investigated using the proposed numerical approach. Conclusions are made to highlight the suitability of this technique for analyzing similar soil–structure interaction problems.

THREE-DIMENSIONAL SHAPE OPTIMIZATION OF FEMORAL COMPONENT OF HIP PROSTHESES WITH NONLINEAR FRICTIONAL INTERFACE

2004 ◽  
Vol 04 (02) ◽  
pp. 161-172
Author(s):  
HAMID KATOOZIAN ◽  
DWIGHT T. DAVY
Keyword(s):  
Shape Optimization ◽  
Femoral Component ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Interface Condition ◽  
Shear Stresses ◽  
Element Analysis ◽  
Dimensional Shape ◽  
Three Dimensional Shape

A numerical procedure was implemented for the three-dimensional shape optimization of femoral component of total hip replacements. An algorithm was developed for defining the component geometry in terms of longitudinal and cross-sectional shape variables. The three-dimensional design model was combined with a non-linear 3-D finite element analysis and a numerical optimization procedure. An idealized femoral geometry and a frictional contact were used for bone-implant interfaces. The design objective was to reduce the shear stresses and the relative motion between implant and the surrounding bone along the interface region. The general trend in all design optimization was to produce a somewhat bulky implant with a more rectangular cross section. The outcome was more strongly affected by interface condition than choice of objective function.

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