Pitting Corrosion Diagnosis of Bearing Based on Power Cepstrum and Histogram

2012 ◽  
Vol 512-515 ◽  
pp. 1672-1676 ◽  
Author(s):  
Shu Fang ◽  
De Liang Li ◽  
Li Tao Liu ◽  
Zhen Wei Zhang
Keyword(s):  
Pitting Corrosion ◽  
Vibration Amplitude ◽  
Radial Direction ◽  
Impact Force ◽  
Axial Direction ◽  
High Impact ◽  
New Method ◽  
Outer Ring ◽  
Heavy Load ◽  
Bearing Race

The axle assembly of fire robot need endure both heavy load and high impact force, and the pitting corrosion in the bearing race become a commom fault. In this paper, the vibration of bearing both in the inner ring and outer ring was analyzed, the characteristics of bearing with pitting corrosion were also analyzed, and based on those characteristics a new method for pitting corrosion diagnosis were proposed, in this method the power cepstrum in the axial direction and histogram of the vibration amplitude in the radial direction were used for detecting the pitting corrosion of bearing, and experiments results proved the practicability and effectiveness of this method.

Analysis of Vibration Caused by Electromagnetic Force on Stator End-Winding of Large Dry Submersible Motor

2013 ◽  
Vol 416-417 ◽  
pp. 428-432
Author(s):  
Li Shan ◽  
Xiao Wei Cheng ◽  
Yong Fang ◽  
Xiao Hua Bao
Keyword(s):  
Electromagnetic Field ◽  
Steady State ◽  
Transition State ◽  
Electromagnetic Force ◽  
Radial Displacement ◽  
Radial Direction ◽  
Axial Direction ◽  
Axial Displacement ◽  
Force Density ◽  
Submersible Motor

This paper investigates the vibration which caused by electromagnetic on the stator end-winding of the large dry submersible motor. Firstly, the electromagnetic field which included transition state and steady state is researched by 3-D FEM. Secondly, the electromagnetic force which lead to vibrations of end-winding is calculated by numerical method, it can be obtained that where endured the largest force density along the slant part of end-winding. Finally, the radial displacement and the axial displacement of the slant part which caused by vibrations is studied, the analysis results show that the axial displacement is larger than the amplitude of radial displacement. It indicates that the slant part of end-winding will be more easily damaged at axial direction than radial direction.

Study on Vibration Reduction of Finishing Lapping Machine for Bearing Race

2011 ◽  
Vol 199-200 ◽  
pp. 1496-1500
Author(s):  
Jia Man ◽  
Lian Hong Zhang ◽  
Yong Liang Chen
Keyword(s):  
Vibration Amplitude ◽  
Vibration Reduction ◽  
Experimental Studies ◽  
Machining Efficiency ◽  
Bearing Race ◽  
Excitation Force ◽  
Lapping Machine ◽  
Light Material ◽  
Vibration Performance

It is key to improve the machining efficiency of finishing lapping machine to restrain the vibration that raise with work speed. The vibration amplitude is influenced by the excitation force of unbalanced crank-rocker mechanism and the anti-vibration performance of guide. Following improving schemes as adding counterweight to crank-rocker mechanism, adopting the light material motion components and enhancing the anti-vibration performance of guide are proposed based on theoretical and experimental studies. The improving schemes are verified by the experiment.

A New Method for Identifying Recombinations of Existing Knowledge Associated with High-Impact Innovation

2015 ◽  
Vol 33 (2) ◽  
pp. 224-236 ◽  
Author(s):  
Satyam Mukherjee ◽  
Brian Uzzi ◽  
Ben Jones ◽  
Michael Stringer
Keyword(s):  
High Impact ◽  
New Method

Influence of Structure of Electrode Array on Logging. The Resistivity Logging Response through Casing of Structure of Electrode Array

2014 ◽  
Vol 1006-1007 ◽  
pp. 990-993
Author(s):  
An Ling Wang ◽  
Fu Ping Liu
Keyword(s):  
Radial Direction ◽  
Recurrence Formula ◽  
Electrode Array ◽  
Axial Direction ◽  
Formation Model ◽  
Line Equation ◽  
Metal Casing ◽  
Resistivity Logging ◽  
Important Significance ◽  
Computing Speed

Because difference of formation model affects the potential distribution on the metal casing, the resistivity logging response can be obtained through casing by measuring the potentials on the metal casing. In fact, the logging responses are the comprehension effects of complex formation and metal casing, so that in the coefficients of transmission line equation (TLE), we should consider the effects of formation model in radial-direction. In the following, for the formation taking on six-layer in axial-direction, and step in radial-direction, the resistivity logging responses through casing are researched and discussed, and given the recurrence formula to compute potential. Draw the curve of the resistivity logging response through casing of six-layer formations. The conductivity of formation is computed is very approximating to that of formation model. The computing examples also show that this method has a fast computing speed (the run time of computing example is less than 1s). For analysis the logging response of six-layers and block formations, and the design of logging instruments, the research is important significance and useful.

Fiber Bragg Grating High Impact Force Sensors With Adjustable Sensitivity and Dynamic Range

2019 ◽  
Vol 19 (14) ◽  
pp. 5670-5679
Author(s):  
Hannah A. Dinovitzer ◽  
Albane Laronche ◽  
Jacques Albert
Keyword(s):  
Fiber Bragg Grating ◽  
Dynamic Range ◽  
Impact Force ◽  
High Impact ◽  
Bragg Grating ◽  
Force Sensors

Mechanical Model of Non-Magnetic Particles Centrifugal Separation in Magnetic Fluid

2013 ◽  
Vol 820 ◽  
pp. 225-228
Author(s):  
Tong Li ◽  
Jing Tao Wei ◽  
Ji Li
Keyword(s):  
Centrifugal Force ◽  
Magnetic Fluid ◽  
Mechanical Model ◽  
Radial Direction ◽  
Magnetic Particles ◽  
Axial Direction ◽  
Separation Mechanism ◽  
Centrifugal Separation

It is difficult to sort fine non-magnetic particles only by the buoyancy of magnetic fluid. Therefore, based on the magneto hydrostatic separation, the centrifugal separation under the condition of centrifugal force would be an effective method to improve the efficiency. By establishing the mechanical model of centrifugal separation in magnetic fluid, this paper analyzes the kinematical equations of non-magnetic particles in three directionstangential direction, radial direction, and axial direction, and then theoretically explores the separation mechanism of this method.

USE OF SOLID STATE NUCLEAR TRACK DETECTORS CR-39 TO STUDY CHARGED PARTICLES EMISSION FROM A 3 kJ PLASMA FOCUS

1995 ◽  
Vol 09 (16) ◽  
pp. 1033-1037
Author(s):  
M. ZAKAULLAH ◽  
IMTIAZ AHMAD ◽  
KHAIRUR REHMAN ◽  
G. MURTAZA
Keyword(s):  
Charged Particle ◽  
Solid State ◽  
Plasma Focus ◽  
Radial Direction ◽  
Particle Flux ◽  
Charged Particles ◽  
Axial Direction ◽  
Low Energy ◽  
Nuclear Track Detectors

The CR-39 solid state nuclear track detectors are employed to investigate the fluence anisotropy of charged particles (protons, deuterons and tritons) emitted from the focus region of a low energy Mather-type plasma focus energized by a single 32 μF, 15 kV (3.6 kJ) capacitor. The charged particle flux is the highest in the axial direction, and decreases towards the radial direction. The radial charged particles flux is six times smaller than the flux in the axial direction.

A New Method for Detecting Jet Impact Force of Laser Cavity

2013 ◽  
Vol 552 ◽  
pp. 463-469 ◽  
Author(s):  
Ming Li ◽  
Rong Qing Xu
Keyword(s):  
Laser Ablation ◽  
Impact Force ◽  
Target Material ◽  
Laser Cavity ◽  
The Other ◽  
New Method ◽  
Impact Forces ◽  
Jet Impact ◽  
Variational Characteristic ◽  
Experiment Device

Based on the deflection effect resulted from deformation, a new experiment device for measuring the jet impact force of laser cavity is developed. The device has been used in experiment and the typical signal of jet impact force was obtained. The variational characteristic of the force with time was given. The result shows that during the experiment the target material sustains three forces. In order of time, the first force is the laser ablation force, and the other two forces are jet impact forces. The first jet impact force is greater than the ablation force and the second jet impact force is smaller than the first jet impact force.

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