Analysis of vibration reduction characteristics of composite fiber curved laminated panels

2020 ◽  
Vol 233 ◽  
pp. 111396
Author(s):  
Wang Xianfeng ◽  
Wang Huaqiao ◽  
Ma Cheng ◽  
Xiao Jun ◽  
Li Liang
Keyword(s):  
Vibration Reduction ◽  
Composite Fiber ◽  
Laminated Panels ◽  
Reduction Characteristics

Analysis of vibration reduction characteristics of composite fiber curved laminated panels

2019 ◽  
Vol 227 ◽  
pp. 111231 ◽  
Author(s):  
Xianfeng Wang ◽  
Huaqiao Wang ◽  
Cheng Ma ◽  
Jun Xiao ◽  
Liang Li
Keyword(s):  
Vibration Reduction ◽  
Composite Fiber ◽  
Laminated Panels ◽  
Reduction Characteristics

Analysis on Vibration Reduction Characteristics of Ladder Track Structure on Metro Viaduct under Measured Track Irregularities

2012 ◽  
Vol 226-228 ◽  
pp. 406-410
Author(s):  
Xiao Zhou Liu ◽  
Song Liang Lian ◽  
Hong Liang Wei
Keyword(s):  
Dynamic Characteristics ◽  
Vibration Reduction ◽  
Time History ◽  
Track Structure ◽  
Vibration Level ◽  
Frequency Range ◽  
3D Fem ◽  
Vertical Accelerations ◽  
Reduction Characteristics ◽  
Track Irregularities

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.

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

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
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.

Verification of Vibration Reduction Characteristics with Soilbag Structure

2009 ◽  
pp. 603-608 ◽  
Author(s):  
Y. Nakagawa ◽  
G. L. Chen ◽  
T. Tatsui ◽  
S. Chida
Keyword(s):  
Vibration Reduction ◽  
Reduction Characteristics

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

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
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.

Transient Vibration Reduction Through the Use of Dual Absorbers

1995 ◽  
Author(s):  
Faruk H. Bursal
Keyword(s):  
Steady State ◽  
Frequency Response ◽  
Vibration Reduction ◽  
Rotating Machinery ◽  
Design Tool ◽  
Operating Frequency ◽  
Transient Vibration ◽  
Natural Period ◽  
Start Up ◽  
Reduction Characteristics

Abstract The dual absorber configuration is shown to exhibit considerable improvements with respect to transient vibration over the conventional, single-absorber design for the same amount of total absorber mass. The term transient as used in this paper refers to monotonic changes in frequency during the start-up and shut-down of rotating machinery. The use of the frequency response as a design tool for this kind of transient is motivated by a quasi-staticity argument, which presumes the change in the operating frequency to be slow relative to the natural period of the oscillations. New tuning rules for dual absorbers are presented that yield near-optimal levels of transient vibration reduction along with significant steady-state attenuation. The improvements obtainable by using dual absorbers become more pronounced when the system changes its speed of rotation more slowly. The dual absorber design appears to exhibit the best overall vibration reduction characteristics among all passive absorbers tested and can also be installed retroactively onto an existing absorber setup. Because the design shares the simplicity of construction and maintenance of other passive absorbers, it is believed to be an excellent alternative to more complicated active or semi-active absorbers in many situations.

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

2016 ◽  
Vol 16 (6) ◽  
pp. 319-324
Author(s):  
Kwonil Kim ◽  
◽  
Woojin Han ◽  
Sanghyun Choi ◽  
Minseu Kim ◽  
...  
Keyword(s):  
Vibration Reduction ◽  
Support Device ◽  
Reduction Characteristics ◽  
Friction Pendulum
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