Fundamental Study on Contact Behavior of Ultrasonic Motor

2005 ◽  
Author(s):  
Daichi Nakajima ◽  
Tomoyuki Ozawa ◽  
Takeshi Maeda ◽  
Michio Tsukui ◽  
Kohro Takatsuka ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Energy Efficiency ◽  
Finite Element ◽  
Frictional Force ◽  
Numerical Technique ◽  
Ultrasonic Motor ◽  
The Finite Element Method ◽  
Fundamental Study ◽  
Contact Behavior ◽  
Lining Material

We discuss the contact behavior between the stator and the lining material that sticks to the rotor of an ultrasonic motor. The ultrasonic motor is powered by the vibration of the stator and operates with a frictional force between the stator and the lining material. Therefore, it is important to examine the mechanism of the contact behavior to improve the energy efficiency and durability of the ultrasonic motor. We propose a numerical technique using the finite element method to examine the contact behavior between the stator and the lining material. Then, we compare the numerical example with the theoretical solution proposed by L. A. Galin and confirm the validity of our technique. Moreover, on the basis of incremental theory, we use our technique to numerically examine the complex contact behavior of the non-contact zone, slip zone and stick zone in a non-rotating rotor.

A Fundamental Study on Dynamic Contact Behavior of an Ultrasonic Motor (Coexistence of Stick and Slip Contact Zone)

2012 ◽  
Author(s):  
Takafumi Ohnishi ◽  
Tomoaki Nakayama ◽  
Kiyotaka Yamashita ◽  
Kohro Takatsuka ◽  
Tsuneo Akuto ◽  
...  
Keyword(s):  
Contact Zone ◽  
Numerical Technique ◽  
Dynamic Contact ◽  
Ultrasonic Motor ◽  
The Finite Element Method ◽  
Fundamental Study ◽  
Contact Behavior ◽  
Static Contact ◽  
Driving Torque ◽  
Contact Mechanism

We discuss the dynamic complex contact behavior between the stator and the liner that sticks to the rotor of an ultrasonic motor. An ultrasonic motor is powered by the vibration of the stator and operated by a frictional force between them. Therefore, it is important to examine the dynamic mechanism of the contact behavior to improve the energy efficiency and durability of the ultrasonic motor. We already proposed a numerical technique using the finite element method (FEM) on the basis of incremental theory to analyze the behavior of the complex contact zone which contains non-contact zone, slip contact zone and stick contact zone in a non-rotating rotor as a static contact problem. In this paper, we expand this numerical technique from a non-rotating rotor to a rotating rotor and propose a numerical technique to analyze the dynamic behavior of this complex contact zone. Moreover, we clear the dynamic contact mechanism and the driving characteristics of the ultrasonic motor such as the dependency of driving torque on the maximum frictional co-efficient.

Finite Element Simulation of Performance Characteristics of Infinitely Wide Plane Pad Slider Bearing

2009 ◽  
Vol 62-64 ◽  
pp. 637-642 ◽  
Author(s):  
M.H. Oladeinde ◽  
John A. Akpobi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Frictional Force ◽  
Maximum Point ◽  
The Finite Element Method ◽  
Slider Bearing ◽  
Aspect Ratios ◽  
Element Simulation ◽  
Element Method

The paper describes the results of a numerical study using Galerkin’s finite element method on an infinitely wide slider bearing. The analysis is based upon the generalized Reynolds equation with the assumption that the pressure gradient in the lubricating film is negligible in the axial direction. Detailed results for bearing characteristics including pressure, load capacity, frictional force, frictional coefficient as a function of film thickness ratio (aspect ratio), and velocity of slider show that these parameters have a strong influence on the bearing behavior. Specifically, it has been shown that friction coefficient and frictional force increases with lower aspect ratios. Also, higher load carrying and maximum pressure is obtained with increased speed of the slider Point wise comparison of the results obtained using the Finite Element Method and that obtained with second order Finite Difference marching Method using base parameters show that the latter simulation has a maximum point wise error of 0.46% in comparison to 0.32% for Finite Element simulation. It has been shown that the Finite Element Method produces more accurate results. The results are in tabular and graphical forms.

New Boundary Treatment in the Finite Element Model Using the Shallow Water Equation

2012 ◽  
Vol 446-449 ◽  
pp. 2694-2698
Author(s):  
Tae Hwa Jung
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Complex Geometry ◽  
Numerical Technique ◽  
Shallow Water Equation ◽  
Element Model ◽  
The Finite Element Method ◽  
Boundary Treatment ◽  
The Finite Element Model ◽  
Element Method

Effective numerical technique for treatment of inclined boundary in the finite element method was introduced. Finite element method was frequently used to analyze hydraulic phenomena in the coastal zone because it can be applied to irregular and complex geometry. In this study, we introduced the way to treat the boundary condition over an inclined bottom.

Dynamic Stresses and Displacements Around Cylindrical Cavities of Arbitrary Shape

1984 ◽  
Vol 51 (4) ◽  
pp. 798-803 ◽  
Author(s):  
S. K. Datta ◽  
K. C. Wong ◽  
A. H. Shah
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Multiple Scattering ◽  
Circular Hole ◽  
Arbitrary Shape ◽  
Numerical Technique ◽  
The Finite Element Method ◽  
Dynamic Stresses ◽  
Cylindrical Holes ◽  
Cylindrical Cavities

Dynamic stresses and displacements around cylindrical cavities of various shapes, namely, circular, triangular, and square cavities are presented in this paper. Also presented are results for a pair of circular cavities of equal radii and a pair of circular and square cavities. These results are of interest in estimating the effects of corners and multiple scattering on the distribution of dynamic displacements and stresses around cylindrical holes or openings. Since exact analytical solutios are not available in these cases (except for a single circular hole) a numerical technique combining the finite element method (FEM) and the method of eigenfunction expansions is used here.

scholarly journals Nonlinear Dynamic Analysis of Axisymmetric Solids by the Finite Element Method

1974 ◽  
Vol 96 (2) ◽  
pp. 103-112 ◽  
Author(s):  
M. Hartzman
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Technique ◽  
Nonlinear Dynamic Analysis ◽  
Plastic Behavior ◽  
The Finite Element Method ◽  
Lumped Mass ◽  
Mass System ◽  
The Impact ◽  
Element Method

A method for calculating the dynamic response of deformable axisymmetric solids, subjected to time-dependent axisymmetric loads is described. The nonlinearities considered in this analysis include material nonlinearity (elastic-plastic behavior) and geometric nonlinearity, which includes finite deformation. The finite-element method is applied to approximate the continuum by a lumped-mass system connected by axisymmetric elements. The equations of motion are solved by applying a step-by-step numerical technique. The analysis is illustrated by application to the collapse of a built-in spherical dome with varying thickness and to the impact of a cylinder against a rigid wall. Close agreement is obtained between the results from the present technique and results obtained from the literature.

Study on the Clearance of Automotive Hub-Bearings

2011 ◽  
Vol 42 (10) ◽  
pp. 28-34
Author(s):  
Yuanxin Luo ◽  
Yongqing Wang ◽  
Xingchun Yan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Analytical Method ◽  
Dynamic Performance ◽  
Assembly Process ◽  
The Finite Element Method ◽  
Fundamental Study ◽  
Rotating Speed ◽  
Initial Setting ◽  
Bearing Assembly

The hub-bearing assembly is one of the fundamental components of modern vehicles. A bad hub-bearing can cause phantom noises or ghost vibrations at sporadic points during the drive. In this paper, effects on the clearance of the bearing are investigated by both the analytical method and the Finite Element Method (FEM). It is found that the assembly process, the initial setting clearance, the rotating speed, the thermo-expansion contribute to the clearance of automotive hub bearing. The fundamental study is the basis for analyzing the dynamic performance and noise of the bearing. Also, it can be extended to optimize the assembly process.

Design of a Linear Ultrasonic Motor With the Bi-Directional Movement

2005 ◽  
Author(s):  
Yuan Mao Huang ◽  
Shih-Shun Huang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Input Signal ◽  
Ultrasonic Motor ◽  
Mode Shapes ◽  
The Finite Element Method ◽  
Resonant Frequencies ◽  
Linear Ultrasonic Motor ◽  
Directional Movement ◽  
Vibratory Analysis

This study presents a design of the linear ultrasonic motor. The major components consist of a slider and a vibrator with a piezoceramic piece. The input signal on the piezoceramic piece causes vibration of the vibrator. The development of the vibrator is based on vibratory analysis of a beam with both ends clamped. The resonant frequencies and the vibratory mode shapes of the vibrator are calculated and compared with those obtained by using the finite element method. By only changing two frequencies of the input signal on the piezoceramic piece, the vibrator is excited and the slider can achieve forward and backward bi-directional movement due to friction between the vibrator and the slider. The calculated results are compared with results obtained by Grant and using software ANSYS.

Modal Analysis on Linear Ultrasonic Motor

2015 ◽  
Vol 742 ◽  
pp. 522-524
Author(s):  
Lei Luo ◽  
Qian Luo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vibration Mode ◽  
Ultrasonic Motor ◽  
Industrial Robots ◽  
The Finite Element Method ◽  
Actual Structure ◽  
Linear Ultrasonic Motor ◽  
Inherent Frequency ◽  
High Thrust

As the expanding applications of linear ultrasonic motor, the demand for high-thrust linear ultrasonic motor in the aerospace and industrial robots is growing. Consequently, for a high-thrust linear motor, it’s stator model was established according to the actual structure of the motor stator and was also analyzed of the motor stator modal by the finite element method. The results show that the inherent frequency of vibration for the motor stator increases with the order, and corresponds with the vibration mode, by which was realized to work for the linear ultrasonic motor.

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