Vibration Reduction Characteristics of a Mechanical Piping Support Device Based on Friction Pendulum Principle

3D FEM models of ladder track and rail-bearing platform track on metro viaduct were established to analyze the vibration reduction characteristics of ladder track structure. Based on track irregularities measured by track inspection car, time-history vertical accelerations of rail, sleeper, flange and beam bottom were solved to contrast the dynamic characteristics of the two track structure. Results show that the vibration level of rail and sleeper are higher on ladder track than on rail-bearing platform track, and the vibration reducing effect of ladder track for flange and beam bottom mainly embodies in frequency range of 1~40Hz in which average vibration reduction values on flange and beam bottom are 28dB and 22dB, with maximum values 40dB and 33dB. The results can provide reference for design of ladder track as well as its application in metro line.

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Simulation study on vibration reduction characteristics of two-degree of freedom suspension system in a quarter vehicle

2017 IEEE 3rd Information Technology and Mechatronics Engineering Conference (ITOEC) ◽

10.1109/itoec.2017.8122490 ◽

2017 ◽

Author(s):

Ning Zhang ◽

Youzhen Zhang ◽

Xutao Li ◽

Zhitao Kan

Keyword(s):

Simulation Study ◽

Vibration Reduction ◽

Suspension System ◽

Degree Of Freedom ◽

Reduction Characteristics ◽

Two Degree Of Freedom

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Experimental Study on Vibration Reduction Characteristics of Gear Shafts Based on ISFD Installation Position

Shock and Vibration ◽

10.1155/2017/7246356 ◽

2017 ◽

Vol 2017 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

Kaihua Lu ◽

Lidong He ◽

Yipeng Zhang

Keyword(s):

Experimental Study ◽

Vibration Reduction ◽

First Grade ◽

Spur Gear ◽

Gear System ◽

Experimental Results ◽

Squeeze Film ◽

Squeeze Film Damper ◽

System Vibration ◽

Reduction Characteristics

A novel type of integral squeeze film damper (ISFD) is proposed to reduce and isolate vibration excitations of the gear system through bearing to the foundation. Four ISFD designs were tested experimentally with an open first-grade spur gear system. Vibration reduction characteristics were experimentally studied at different speeds for cases where ISFD elastic damping supports were simultaneously installed on the driving and driven shafts, installed on the driven shaft, or only installed on the driving shaft. Experimental results show that the ISFD elastic damping support can effectively reduce shock vibration of the gear system. Additionally, resonant modulation in gear shafts caused by meshing impact was significantly reduced. Different vibration amplitudes of gear shafts with ISFD installed only on driven or driving shafts were compared. Results indicated that vibration reduction is better when ISFD is only installed on the driven shaft than on the driving shaft.

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Verification of Vibration Reduction Characteristics with Soilbag Structure

Geosynthetics in Civil and Environmental Engineering ◽

10.1007/978-3-540-69313-0_112 ◽

2009 ◽

pp. 603-608 ◽

Cited By ~ 3

Author(s):

Y. Nakagawa ◽

G. L. Chen ◽

T. Tatsui ◽

S. Chida

Keyword(s):

Vibration Reduction ◽

Reduction Characteristics

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Study on the Nonlinear Characteristics of a Rotating Flexible Blade with Dovetail Interface Feature

Shock and Vibration ◽

10.1155/2018/4923898 ◽

2018 ◽

Vol 2018 ◽

pp. 1-13 ◽

Cited By ~ 3

Author(s):

Chaofeng Li ◽

Zengchuang Shen ◽

Bingfu Zhong ◽

Bangchun Wen

Keyword(s):

Dry Friction ◽

Piecewise Linear ◽

Vibration Reduction ◽

External Excitation ◽

Stick Slip ◽

Nonlinear Characteristics ◽

Rotating Speed ◽

Rotating Blade ◽

Reduction Characteristics ◽

Experimental Researches

A dynamic model is proposed in this paper for analyzing the nonlinear characteristics of a flexible blade. The dynamical equation of motion for a rotational flexible blade in a centrifugal force field is established based on the finite element method. A macro-stick-slip mechanical model of dry friction is established to simulate the constraint condition of the flexible blade. The combined motion of the external excitation and friction produces a piecewise linear vibration which is actually nonlinear. The numerical integration method is employed to calculate the vibration reduction characteristics of the nonlinear constrained rotating blade. The results show that the nonlinear dry friction force produced by the dovetail interface plays an important role in vibration reduction. And the effect of dry friction vibration reduction is significant when the rotating speed is slow or the friction coefficient is small. Besides, the magnitude of external excitation also has a great impact on the state of the friction. Therefore, some relevant experimental researches should be done in the future.

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