scholarly journals QUANTIFICATION OF RESPONSE FLUCTUATION CAUSED BY UNCERTAINTY OF FUNDAMENTAL VIBRATION CHARACTERISTICS BASED ON STATIONARY RANDOM VIBRATION RESPONSE OF SDOF SYSTEM

2013 ◽  
Vol 78 (692) ◽  
pp. 1715-1723
Author(s):  
Norio IWATA
Keyword(s):  
Random Vibration ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Fundamental Vibration ◽  
Sdof System ◽  
Response Fluctuation

Study on Flow-Induced Vibration Characteristics of Hydraulic Hoist of Large-Span Upwelling Radial Steel Gate

2011 ◽  
Vol 117-119 ◽  
pp. 241-246
Author(s):  
Zhen Hai Gao ◽  
Gen Hua Yan ◽  
Peng Liu ◽  
Fa Zhan Chen ◽  
Fei Ming Lv
Keyword(s):  
Dynamic Characteristics ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Flow Induced Vibration ◽  
Structural Dynamic ◽  
Large Span ◽  
Response Characteristics ◽  
Lever Action ◽  
Structural Dynamic Characteristics ◽  
Steel Gate

In this paper we conduct study on flow-induced vibration of large-span upwelling radial steel Gate and its hydraulic hoist. Place an emphasis on vibration response characteristics under two working conditions of diversion and drainage, which proves the safety of hydraulic hoist gate vibration caused by gate vibration. Firstly, we study on dynamic characteristics of fluid-structure interaction of association system of gate and start and stop lever, reveals the discipline of the effect fluid having on structural dynamic characteristics. On this basis, flow-induced vibration characteristics under two conditions of with and without start and stop lever action considered. The results indicate that the gate vibration response with hydraulic hoist used decreases, which explains start and stop lever has certain effect of restraining vibration on gate vibration. In addition, under the working condition of drainage the vibration magnitude of start and stop lever is smaller than that of gate body, which explains there is damping action during transference of gate vibration through start and stop lever. The results find out that on the assumption of optimized gate structure and hydraulic arrangement, it is practicable, safe and reliable to adopt hydraulic hoist. The achievement has directive significance on similar projects construction in the future

Random Vibration Response II: Simple Examples

1971 ◽  
pp. 87-95
Author(s):  
John D. Robson ◽  
Colin J. Dodds ◽  
Donald B. Macvean ◽  
Vincent R. Paling
Keyword(s):  
Random Vibration ◽  
Vibration Response

A Quantitative Method of Tailoring Input Spectra for Random Vibration Screens

1987 ◽  
Vol 30 (5) ◽  
pp. 42-49
Author(s):  
Allen Curtis ◽  
Richard McKain
Keyword(s):  
Random Vibration ◽  
Quantitative Method ◽  
Vibration Response ◽  
Rational Method ◽  
Mechanical Equipment ◽  
Precipitation Threshold

This paper presents a rational method by which an effective random vibration screen may be developed efficiently and quantitatively. In summary, a Flaw Precipitation Threshold (FPT) was derived from measurements of vibration response at known flaw locations. Responses were measured on a variety of modern electronic and electro-mechanical equipment, manufactured by five different manufacturers, during ongoing vibration screens. A vibration screen can be tailored for a piece of equipment by performing a global vibration response survey and adjusting the input spectra so that the response falls within the FPT.

A New Mistuning Form in Periodic Structure - Force Mistuning

2012 ◽  
Vol 562-564 ◽  
pp. 2092-2096 ◽  
Author(s):  
Guo Hui Yang ◽  
Ai Lun Wang ◽  
Xu Hui Cao
Keyword(s):  
Periodic Structure ◽  
Vibration Mode ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Engineering Practice ◽  
Characteristic Vibration ◽  
Natural Parameter ◽  
Mode Localization ◽  
Vibration Localization ◽  
Natural Characteristic

The mistuning of periodic structure was generally considered to be natural parameter mistuning, such as stiffness mistuning, damping mistuning and mass mistuning. However, in engineering practice, there was another kind of mistuning——force mistuning, which has not been studied yet. Based on a typical concentrated parameter model of periodic structure, the vibration characteristics, such as natural characteristic, vibration mode and vibration localization of periodic structure with different mistuning forms, were compared and analyzed. The results show that, as a new mistuning form, force mistuning won’t bring mode localization, while it could lead to vibration response localization

scholarly journals Influence of Bearing Stiffness on the Nonlinear Dynamics of a Shaft-Final Drive System

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Xu Jinli ◽  
Wan Lei ◽  
Luo Wenxin
Keyword(s):  
Coupled System ◽  
Torque Ripple ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Drive System ◽  
Lumped Mass ◽  
Driving Speed ◽  
Bearing Stiffness ◽  
Final Drive ◽  
The Given

The bearing stiffness has a considerable influence on the nonlinear coupling vibration characteristics of the shaft-final drive system. A 14-DOF nonlinear coupled vibration model was established by employing the lumped mass method so as to identify the coupling effects of the bearing stiffness to the vibration response of the shaft-final drive system. The engine’s torque ripple, the alternating load from the universal joint (U-joint), and the time-varying mesh parameters of hypoid gear of the shaft-final drive system were also considered for accurate quantitative analysis. The numerical analysis of the vibration response of the coupled system was performed and the experimental measurements were carried out for the validation test. Results show that, at the given driving speed, improving the bearing stiffness can reduce the vibration response of the given coupled system; however, when the bearing stiffness increases to a critical value, the effects of bearing stiffness on the vibration reduction become insignificant; when the driving speed changes, the resonance regions of the coupled system vary with the bearing stiffness. The results are helpful to determine the proper bearing stiffness and the optimum control strategy for the shaft-final drive system. It is hoped that the optimal shaft-final drive system can provide good vibration characteristics to achieve the energy saving and noise reduction for the vehicle application.

Damping Influence of System Vibration

2011 ◽  
Vol 71-78 ◽  
pp. 1889-1892
Author(s):  
Min Yuan Huang
Keyword(s):  
Free Vibration ◽  
Low Frequency ◽  
Harmonic Excitation ◽  
External Condition ◽  
Vibration Characteristics ◽  
Parameter Determination ◽  
Damping Factor ◽  
Fundamental Vibration ◽  
Frequency Effects ◽  
System Vibration

Regarding the system vibration as the research object, we study vibration characteristics of the system vibration under the damping action. The primary coverage is as follows: under the external condition of undamped condition, damping condition, free vibration, and harmonic excitation, etc., the fundamental vibration form possesses vibration characteristics. In the project practice, the damping factor’s role to the vibrating system, as well as parameter determination is the damping factor. Low frequency effects on the structure system along with the effective of controlling resonance. In the damping treatment, we have characteristics demand for the damping. Through thorough analysis to damping action, we will obtain the best project fitting.

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