Self-excitations of Train-Bridge Coupling Vibration System

2017 ◽  
pp. 149-190 ◽  
Author(s):  
He Xia ◽  
Nan Zhang ◽  
Weiwei Guo
Keyword(s):  
Vibration System ◽  
Coupling Vibration

Numerical Computation for the Inertial Coupling Vibration System Using PL Method

2019 ◽  
Vol 7 (2) ◽  
pp. 139-148
Author(s):  
Pan Fang ◽  
Liming Dai ◽  
Yongjun Hou ◽  
Mingjun Du ◽  
Luoyao Wang ◽  
...  
Keyword(s):  
Numerical Computation ◽  
Vibration System ◽  
Coupling Vibration ◽  
Inertial Coupling

scholarly journals Synchronization of Two Homodromy Rotors Installed on a Double Vibro-Body in a Coupling Vibration System

PLoS ONE ◽  
2015 ◽  
Vol 10 (5) ◽  
pp. e0126069 ◽  
Author(s):  
Pan Fang ◽  
Yongjun Hou ◽  
Yanghai Nan
Keyword(s):  
Vibration System ◽  
Coupling Vibration

scholarly journals Vertical–Horizontal Coupling Vibration of Hot Rolling Mill Rolls under Multi-Piecewise Nonlinear Constraints

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 170
Author(s):  
Rongrong Peng ◽  
Xingzhong Zhang ◽  
Peiming Shi
Keyword(s):  
Hot Rolling ◽  
Rolling Mill ◽  
Hydraulic Cylinder ◽  
Nonlinear Constraints ◽  
Nonlinear Friction ◽  
Vibration System ◽  
Coupled Vibration ◽  
Coupling Vibration ◽  
Spring Force ◽  
Hot Rolling Mill

This study establishes a vertical–horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints considering the piecewise nonlinear spring force and piecewise nonlinear friction force constraints of the hydraulic cylinder in the vertical direction of the rolls, the piecewise stiffness constraints in the horizontal direction, and the influence of the nonlinear dynamic rolling force in the rolling process. Using the average method to solve the amplitude–frequency response equation of the coupled vibration system and taking the actual parameters of a 1780 mm hot rolling mill (Chengde Steel Co., Ltd., Chengde, China) as an example, we study the amplitude–frequency characteristics of the mill rolls under different parameter settings. The results show that the amplitude and resonance region can be reduced by appropriately reducing the external disturbance force and the nonlinear spring force of the hydraulic cylinder, appropriately increasing the nonlinear friction force, and eliminating the gap between the bearing seat and the mill housing, to avoid the amplitude jump phenomenon due to piecewise variation. Furthermore, using the singularity theory to study the static bifurcation characteristics of the coupled vibration system, we establish a relationship between the vibration parameters and the topological bifurcation solution of the coupled system. The transition sets and their corresponding bifurcation topological structure in three cases are given, and the steady and unsteady process parameter regions of the rolls are obtained. The dynamic behavior of the coupled vibration system can be controlled by varying the bifurcation parameter. This study provides a theoretical basis for restraining the vibration of hot rolling mill rolls and optimizing the process parameters.

Analysis Coupling Vibration Characteristic of HVAS Droplets Based on Wave-Like Disturbance

2011 ◽  
Vol 71-78 ◽  
pp. 5068-5073
Author(s):  
Bin Chen ◽  
Ge Liu ◽  
Xian Ming Zhang ◽  
Lang Huang
Keyword(s):  
Molten Metal ◽  
Liquid Droplet ◽  
Wave Number ◽  
System Of Equations ◽  
Liquid Droplets ◽  
Vibration System ◽  
Gas Velocity ◽  
Coupling Vibration ◽  
Theoretical Evidence ◽  
Sprayed Coating

Characteristics of vibration molten metal droplets are decisive importance to performance of high velocity arc sprayed coating, it is hardly that detected the dynamic action of liquid droplets owing to the limitation of experimental technique. The gas fluid-liquid droplet coupling vibration system of equations were established based on wave-like disturbance, the governing equation for fastest-growing wave number is derived. The agreement of predicted fastest-growing wave number and data of Bradley, which has the deviation within the±2% limits,indicares that the gas fluid-liquid droplet coupling vibration system of equations is effective. By the use of the coupling vibration system of equations, the effects of gas velocity, gas type and molten metal type to vibration characteristics of HVAS droplets is researched. The results show that selected N2gas sprayed and increasing the gas velocity would be raise adhesive strength of the spraying coating, and provides theoretical evidence for choice of spraying materials and control in HVAS.

Vibration Analysis and Optimal Design in Hydraulic Leveling System

2012 ◽  
Vol 566 ◽  
pp. 637-640 ◽  
Author(s):  
Qiang Gao ◽  
Meng Zhang
Keyword(s):  
Transfer Function ◽  
Vibration Analysis ◽  
Hydraulic System ◽  
Impact Force ◽  
Actual Situation ◽  
Vibration System ◽  
Response Curves ◽  
Coupling Vibration ◽  
Coupling Relationship ◽  
Vibration Model

In the process of launching, some launch bearing platforms will bear large impact force, thus causing severe vibration of the platform. There exists coupling relationship between this kind of vibration and the hydraulic system. In this paper, we established the vibration model according to the coupling vibration system in bearing platform and hydraulic system, and realized decoupling. Then we derived the vibration controlling equation and transfer function of coupling vibration between bearing platform and hydraulic system. Further more, we simulate the actual situation in software Simulink, and it gave vibration response curves under different parameters. In this way, it provides basis for reducing platform vibration.

Preloading effects on clearance problem in rotor-coupling vibration system: experimentation and simulation

2002 ◽  
Vol 14 (9) ◽  
pp. 1371-1378 ◽  
Author(s):  
Md.Zahid Hossain ◽  
Kazuki Mizutani ◽  
Hideki Sawai ◽  
Mitsuhiro Kato
Keyword(s):  
Vibration System ◽  
Coupling Vibration

Research on Vehicle-Bridge Coupling Vibration of Road Train

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Hao Zhang ◽  
Yue Li ◽  
Cheng-Qiang Zong ◽  
Chuan-Jin Ou ◽  
Bing-Tao Li
Keyword(s):  
Coupling Vibration

The scientific bases of autocontrol with vibration phase for a resonance beating-vibration system with two degrees of freedom driven by debalances

1996 ◽  
Vol 18 (2) ◽  
pp. 43-48
Author(s):  
Tran Van Tuan ◽  
Do Sanh ◽  
Luu Duc Thach
Keyword(s):  
Degrees Of Freedom ◽  
Regulation System ◽  
Vibration System ◽  
Two Degrees Of Freedom ◽  
System Operating

In the paper it is introduced a method for studying dynamics of beating-vibrators by means of digital calculation with the help of the machine in accordance with the needs by the helps of an available auto regulation system operating with high reability.

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