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.

Experimental Study on the Performance of Constrained Damped Rail Vibration Reduction

2011 ◽  
Vol 42 (10) ◽  
pp. 9-14
Author(s):  
L.Y. Liu ◽  
J.Y. Li ◽  
X.J. Yin
Keyword(s):  
Experimental Study ◽  
Time Domain ◽  
Vibration Amplitude ◽  
Impact Load ◽  
Vibration Reduction ◽  
Time Domain Analysis ◽  
Experimental Basis ◽  
Vibration Acceleration ◽  
The Time Domain ◽  
Vibration Performance

To study the vibration reduction performance of damped rail, we take the standard rail and labyrinth constrained damped rail as the study target. By testing the vibration performance of both standard rail and labyrinth constrained damped rail in an anechoic room, we use the time-domain analysis to study the vibration changes with time passing. The results showed that: the labyrinth constrained damped rail vibration can effectively reduce the vibration amplitude and duration. Under the radial impact load, compared to the standard rail, vibration acceleration attenuation of the labyrinth constrained damped rail is 5% −19%, time of vibration and attenuation greater than 94%; under the axial impact load, compared to the standard rail, vibration acceleration attenuation of the labyrinth constrained damped rail is 9% −21%, time of vibration and attenuation greater than 92%. The results have provided an experimental basis for the design of new constrained damped rail.

The Computer Aided Passive Reduction of Vibration to Desired Vibration Amplitude

2013 ◽  
Vol 430 ◽  
pp. 342-350 ◽  
Author(s):  
Andrzej Dymarek ◽  
Tomasz Dzitkowski
Keyword(s):  
Vibration Amplitude ◽  
Vibration Reduction ◽  
Synthesis Method ◽  
Mechanical Systems ◽  
Synthesis Methods ◽  
Discrete Mechanical Systems ◽  
Computer Aided

The paper presents the problem of vibration reduction in designed discrete mechanical systems. The passive vibration reduction based on the synthesis method by using the Synteza application. The presented application has been developed by performing the algorithmization of formulated and formalized synthesis methods provided by the authors.

scholarly journals THE RESULTS OF STUDIES OF THE DEPENDENCE OF THE PERFORMANCE OF THE VIBRATING TWO-SHAFT CENTRIFUGAL MODULE ON THE MODE AND DESIGN PARAMETERS

2019 ◽  
pp. 5-10
Author(s):  
Vladimir Naduty ◽  
Anastasia Loginova ◽  
Vitaliy Sukharev
Keyword(s):  
Rock Mass ◽  
Vibration Amplitude ◽  
Experimental Studies ◽  
Design Parameters ◽  
Crushed Rock ◽  
Experimental Sample ◽  
Elastic Supports ◽  
Loaded Rock ◽  
The Given

The article presents a new design of a vibrating twin-shaft centrifugal module designed for grinding and classification of rock mass. In this design, in addition to grinding, the operation of classification or screening of the crushed mass was added, which does not allow its regrinding and increases the productivity of the device. This is achieved by installing in the bottom of the chamber grinding mesh with cells in accordance with the required class size. At the same time, the classification process is intensified by the presence of vibration from vibration exciters fixed on the camera body and the installation of the camera on elastic supports. The reciprocating horizontal vibrations of the chamber with a given amplitude and frequency contribute to the segregation of the crushed rock mass in the bed by size, which positively affects the efficiency of classification and grinding. The presence of vibration helps to unload the oversize product from the grinding chamber. Also, the article considers experimental studies performed on a vibrational two-shaft centrifugal module to determine the dependence of the performance of a given design on five variable factors: rotor shaft revolutions (n, rpm), size of the loaded rock mass (Δ, mm), rock mass strength (σ, kg/mm2), camera vibration frequency (ω, rpm) and its vibration amplitude (A, mm). Studies have shown the efficiency and increased productivity of the new design in relation to a centrifugal disintegrator without a classification grid and vibration. The results of the work allow us to recommend the design under study for the manufacture of an experimental sample according to the given initial requirements, and the established dependences (Q = f (n, Δ, σ, ω, A) make it possible to develop a mathematical model of the grinding process in this setup to calculate the required parameters.

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.

scholarly journals The New “p–n Junction”: Plasmonics Enables Photonic Access to the Nanoworld

MRS Bulletin ◽  
2005 ◽  
Vol 30 (5) ◽  
pp. 385-389 ◽  
Author(s):  
Harry A. Atwater ◽  
Stefan Maier ◽  
Albert Polman ◽  
Jennifer A. Dionne ◽  
Luke Sweatlock
Keyword(s):  
Self Assembly ◽  
Energy Transport ◽  
Imaging Spectroscopy ◽  
Scaling Limit ◽  
Experimental Studies ◽  
Building Blocks ◽  
Electromagnetic Energy ◽  
Performance Criteria ◽  
Optical Device ◽  
Light Material

AbstractSince the development of the light microscope in the 16th century, optical device size and performance have been limited by diffraction. Optoelectronic devices of today are much bigger than the smallest electronic devices for this reason. Achieving control of light—material interactions for photonic device applications at the nanoscale requires structures that guide electromagnetic energy with subwavelength-scale mode confinement. By converting the optical mode into nonradiating surface plasmons, electromagnetic energy can be guided in structures with lateral dimensions of less than 10% of the free-space wavelength. A variety of methods—including electron-beam lithography and self-assembly—have been used to construct both particle and planar plasmon waveguides. Recent experimental studies have confirmed the strongly coupled collective plasmonic modes of metallic nanostructures. In plasmon waveguides consisting of closely spaced silver rods, electromagnetic energy transport over distances of 0.5 m has been observed. Moreover, numerical simulations suggest the possibility of multi-centimeter plasmon propagation in thin metallic stripes. Thus, there appears to be no fundamental scaling limit to the size and density of photonic devices, and ongoing work is aimed at identifying important device performance criteria in the subwavelength size regime. Ultimately, it may be possible to design an entire class of subwavelength-scale optoelectronic components (waveguides, sources, detectors, modulators) that could form the building blocks of an optical device technology—a technology scalable to molecular dimensions, with potential imaging, spectroscopy, and interconnection applications in computing, communications, and chemical/biological detection.

Residual Vibration Reduction Using Vector Diagrams to Generate Shaped Inputs

1994 ◽  
Vol 116 (2) ◽  
pp. 654-659 ◽  
Author(s):  
W. Singhose ◽  
W. Seering ◽  
N. Singer
Keyword(s):  
Natural Frequency ◽  
Upper Bound ◽  
Vibration Amplitude ◽  
Damping Ratio ◽  
Vibration Reduction ◽  
System Model ◽  
Input Shaping ◽  
Flexible Systems ◽  
Residual Vibration ◽  
Performance Predictions

This paper describes a method for limiting vibration in flexible systems by shaping the input to the system. Unlike most previous input shaping strategies, this method does not require a precise system model or lengthy numerical computation; only estimates of the system natural frequency and damping ratio are required. The effectiveness of this method when there are errors in the system model is explored and quantified. Next, an algorithm is presented, which, given an upper bound on acceptable residual vibration amplitude, determines a shaping strategy that is insensitive to errors in the estimate of the natural frequency. Finally, performance predictions are compared to hardware experiments.

scholarly journals Numerical and experimental studies of excitation force approximation for wave energy conversion

2018 ◽  
Vol 125 ◽  
pp. 877-889 ◽  
Author(s):  
Bingyong Guo ◽  
Ron J. Patton ◽  
Siya Jin ◽  
Jianglin Lan
Keyword(s):  
Energy Conversion ◽  
Wave Energy ◽  
Experimental Studies ◽  
Wave Energy Conversion ◽  
Excitation Force

Influence of parameters of PM controller on vibration performance of liquid hydrostatic guide-way system

2018 ◽  
Vol 49 (4) ◽  
pp. 140-146 ◽  
Author(s):  
Liwen Chen ◽  
Bingyan Cui ◽  
Jianhua Zhao ◽  
Dianrong Gao
Keyword(s):  
Vibration Amplitude ◽  
Force Balance ◽  
Practical Application ◽  
Working Process ◽  
Vibration Model ◽  
Inherent Frequency ◽  
Active Vibration ◽  
Film Stiffness ◽  
Vibration Performance ◽  
Force Balance Equation

The vibration of liquid hydrostatic guide-way system during the working process makes a full impact on the machining precision of the numerically-controlled machine tool. The hydrostatic guide-way under the regulation of PM (Progressive Mengen) controller is taken as the research object. First, based on the force balance equation of hydrostatic guide-way, two kinds of vibration model of hydrostatic guide-way are established, respectively, and oil film stiffness equation and damping coefficient formula are derived. Second, the inherent frequency and amplitude of the guide-way system are derived. Third, the influence of PM controller parameters on the inherent frequency and amplitude of the guide-way system is analysed theoretically. The result indicates that the inherent frequency of the guide-way system changes with PM controller parameter and it makes a full impact on the active vibration amplitude of the hydrostatic guide-way system, but not the passive vibration amplitude. This article is provided a reference for the practical application of PM controller.

scholarly journals A Computational Study on the Damping-Amplitude Dependence and Estimation of the Limit Cycle Oscillations for Normal Triangular Arrays with One Tube Undergoing Fluidelastic Instability

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1498
Author(s):  
Beatriz de Pedro ◽  
Guillermo Laine ◽  
Luis Tufiño ◽  
Jorge Parrondo
Keyword(s):  
Flow Velocity ◽  
Limit Cycle ◽  
Vibration Amplitude ◽  
Computational Study ◽  
Experimental Studies ◽  
Amplitude Dependence ◽  
Limit Cycle Oscillations ◽  
Cfd Model ◽  
Time Step ◽  
Fluidelastic Instability

While the estimation of the critical velocity for fluidelastic instability of tube arrays has received considerable attention for decades, the studies intended to analyze the post-stable behavior have been scarce. However, the behavior of the system under instability, is also interesting in order to characterize the amount of energy transferred from fluid to structure. A computational study has been carried out for the case of one tube vibrating in a normal triangular array by means of a CFD model previously developed with Fluent by the authors. This model incorporates the motion of the vibrating tube by means of user defined functions for both forced and free oscillations, so that the tube position can be updated and the mesh rebuilt at every time step. First, predictions of limit-cycle oscillations (zero net damping) were obtained for pitch ratios P/d = 1.25 and 1.375, so that the experimental response curves (amplitude against flow velocity) measured in other experimental studies could be used for contrast purposes. After validation, the CFD model was used to investigate how the net damping of the fluid-structure system depends on the vibration amplitude for a given flow velocity, which shows the non-linear nature of the tube response. Finally, special simulation series were conducted to explore the effects of pitch ratio, Reynolds number and structural damping on the net damping of the system for constant vibration amplitude.

scholarly journals Development of a Semi-Active Electromagnetic Vibration Absorber and Its Experimental Study

2013 ◽  
Vol 135 (5) ◽  
Author(s):  
Xueguang Liu ◽  
Xiaoxiao Feng ◽  
Ye Shi ◽  
Ye Wang ◽  
Zhijun Shuai
Keyword(s):  
Simulation Analysis ◽  
Vibration Reduction ◽  
Experimental Studies ◽  
Element Model ◽  
Vibration Absorber ◽  
Structural Parameter ◽  
Control Effectiveness ◽  
Electromagnetic Vibration ◽  
Reduction Effect ◽  
Experimental Rig

In this work, a semiactive electromagnetic vibration absorber has been developed based on a proposed electromagnetic stiffness adjustable spring model, which presents a new solution for adjusting stiffness in the field of vibration absorber devices. Simulation study on the electromagnetic spring has been performed to determine the structural parameter of the semiactive vibration absorber. An experimental rig is also built up to investigate its practical vibration control effectiveness. Firstly, the finite element model of the test bench is used to analyze its vibration characteristics. Then, the vibration reduction effect is predicted through the simulation analysis, from which the optimal control positions are found. Finally, the experimental studies are also conducted, and the results show that this semiactive electromagnetic vibration absorber has a frequency adjustment range from 21 Hz to 25 Hz, in which considerable vibration reduction from 5 dB to 10 dB can be achieved.

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