scholarly journals Probabilistic Sensitivity Analysis of Wear Property for MEMS Gas Bearing

2019 ◽  
Vol 9 (20) ◽  
pp. 4409 ◽  
Author(s):  
Liangliang Li ◽  
Di Zhang ◽  
Yonghui Xie
Keyword(s):  
Finite Element Method ◽  
Stochastic Process ◽  
Dynamic Performance ◽  
Correlation Coefficients ◽  
Wear Property ◽  
The Finite Element Method ◽  
Static And Dynamic Characteristics ◽  
Lubrication Equation ◽  
Influence Degree ◽  
Gas Bearing

In this study, the sensitivity of MEMS gas bearing’ performance to the wear in different axial and circumferential positions is investigated in detail. Rarefaction effect is introduced into the transient and steady lubrication equation, and then the finite element method (FEM) is employed to solve the equations. The stochastic process is adopted to simulate wear distribution and view of probability is proposed to describe the change laws of the static and dynamic performance of the bearing. Then, the static and dynamic characteristics of the bearing in 50 wear conditions are calculated for each case. Furthermore, the standard deviations and correlation coefficients of the bearing performance sample points are analyzed to demonstrate the influence degree of wear in different positions.

Design of 2-DOF Micro-Positional Stage Based on Parallel Structure Using Flexible Plate

2010 ◽  
Vol 37-38 ◽  
pp. 317-321
Author(s):  
Hua Chun ◽  
Yu Guo Cui ◽  
Yong Li ◽  
Lei Qiu
Keyword(s):  
Finite Element Method ◽  
Driving Force ◽  
Dynamic Performance ◽  
Parallel Structure ◽  
Flexible Plate ◽  
The Finite Element Method ◽  
Maximum Displacement ◽  
Compact Structure ◽  
Static And Dynamic Characteristics ◽  
Static Performance

A new prototype of 2-DOF micro-positional stage was designed based on parallel structure according to the following requirements of the stage, such as, symmetrical structures in X and Y directions, decoupling movement in X and Y directions, large operating surface, and more simple and compact structure. Using double flexible arched plate, the specified structure of the stage was designed by considering the realization of its movement. Static and dynamic characteristics of the stage have been analyzed by using the finite element method. For the static performance, there is a linear relationship between the displacement of the stage and its driving force. The maximum displacement of the stage is about 36 μm under the maximum force 650 N. For dynamic performance, the natural frequency and the response time of the stage are about 2.4 kHz and 1.4 ms, respectively.

An Experimental Investigation on the Static and Dynamic Characteristics of Journal Bearings Under the Influence of Twisting Misalignment

1997 ◽  
Vol 119 (1) ◽  
pp. 188-192 ◽  
Author(s):  
P. Arumugam ◽  
S. Swarnamani ◽  
B. S. Prabhu
Keyword(s):  
Finite Element Method ◽  
Vertical Direction ◽  
Journal Bearings ◽  
Response Functions ◽  
The Finite Element Method ◽  
Static And Dynamic Characteristics ◽  
Damping Coefficients ◽  
Stiffness And Damping ◽  
Different Levels ◽  
Bearing System

The misalignment between the journal and the bearing in a rotor-bearing system may be due to manufacturing error, elastic deflection, thermal expansion etc. In the present work, the eight linearized stiffness and damping coefficients of the cylindrical and three lobe bearings are identified at different levels of bearing misalignment (twisting misalignment) and at different speeds of the rotor. The identification method used here needs FRFs (Frequency Response Functions) obtained by the measurements and the finite element method. The twisting misalignment changes the stiffness and damping coefficients in the vertical and horizontal directions. In the case of three lobe bearings, for 0.7 degree of misalignment, the stiffness in the vertical direction is increased by about 12 percent.

Performance Analysis of Multirecess Angled-Surface Slot-Compensated Conical Hydrostatic Bearing

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Xiao-Bo Zuo ◽  
Jian-Min Wang ◽  
Zi-Qiang Yin ◽  
Sheng-Yi Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Performance ◽  
Mathematic Model ◽  
Operating Conditions ◽  
Width Ratio ◽  
The Finite Element Method ◽  
Obvious Effect ◽  
Hydrostatic Bearing ◽  
Better Than

Angled-surface slot-compensated hydrostatic bearing (ASHB) is a novel type of hydrostatic bearing which is potentially applicable in rotary tables. However, it has not been sufficiently studied in available literature. In this paper the mathematic model for ASHB was built and solved by the finite element method (FEM). The influence of semicone angle on static and dynamic performance characteristics was theoretically investigated. The simulated results have been compared with that of the traditional fixed slot-compensated hydrostatic bearing (FSHB) on the same geometric and operating conditions. Results show that the performance of ASHB is better than that of FSHB; the studied bearing with a large semicone angle is superior in power consumption; the clearance width ratio of the restricting gap to the bearing gap has an obvious effect on bearing performance.

Design of Porous Restriction Aerostatic Guideway for Form Measuring Instrument

2013 ◽  
Vol 397-400 ◽  
pp. 833-837
Author(s):  
Zhi Qiang Li ◽  
He Chun Yu ◽  
Hui Ying Zhao ◽  
Guo Qing Zhang ◽  
Huan Huan Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Design Principle ◽  
Measuring Instruments ◽  
Measuring Instrument ◽  
The Finite Element Method ◽  
Static And Dynamic Characteristics ◽  
Practical Test ◽  
Precision Measuring ◽  
Design Requirements

This paper proposes a design of aerostatic guideway with the porous restriction for the vertical guideway of form measuring instrument, and analyses the design principle of the guideway.The static and dynamic characteristics of the guideway of different structures were analyzed with the software based on the finite element method, and then the optimum design was obtained by comparing the deformation and natural frequency. Finally the design of the guideway was verified by theoretical calculation and practical test that the accuracy of its various performances fully met the design requirements. The guideway can be widely applied to the form measuring instrument and other precision measuring instruments.

Topology Optimization and Dynamic Performance of a Bike Frame With Dampers

2003 ◽  
Author(s):  
Yuan Mao Huang ◽  
Jiung-Cheng Pan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Simulated Annealing ◽  
Topology Optimization ◽  
Dynamic Performance ◽  
Structural Topology ◽  
The Finite Element Method ◽  
Design Variables ◽  
Joint Location ◽  
Annealing Algorithms

This study utilizes the topology optimization with the finite element method and the simulated annealing algorithms to optimize the structure and the dynamic performance of a bike frame with dampers. Design domains, loadings and boundary conditions of bike frames are defined. Joint locations of a damper with the front and the rear frames and the joint location of the front and the rear frames are considered as design variables. The transient response and the acceleration of a bike on a sinusoid curved road surface are analyzed. Effects of the joint locations and the stiffness of frames on the dynamic performance are studied. The structural topology of frames and joint locations of a bike are recommended to improve the dynamic performance.

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.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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