scholarly journals Discussion: “Analysis of a Hydrodynamic Bearing Under Transverse Vibration of an Axially Moving Band” (Tan, C. A., and Mote, Jr., C. D., 1990, ASME J. Tribol., 112, pp. 514–523)

1990 ◽  
Vol 112 (3) ◽  
pp. 523-523
Author(s):  
C. Y. Wang
Keyword(s):  
Transverse Vibration ◽  
Hydrodynamic Bearing ◽  
Axially Moving ◽  
Moving Band

Analysis of a Hydrodynamic Bearing Under Transverse Vibration of an Axially Moving Band

1990 ◽  
Vol 112 (3) ◽  
pp. 514-523 ◽  
Author(s):  
C. A. Tan ◽  
C. D. Mote
Keyword(s):  
Transverse Vibration ◽  
High Frequency ◽  
Low Frequency ◽  
Fluid Inertia ◽  
Hydrodynamic Bearing ◽  
Steady State Responses ◽  
Axially Moving ◽  
Moving Band ◽  
Unsteady Fluid ◽  
Impedance Functions

This paper presents a mathematical model of the flow and pressure developed in a hydrodynamic guide bearing film under transverse vibration of a translating band. The guide bearing is commonly used in band and circular sawing systems. The perturbed pressure is derived in the frequency domain based on a linearized, incompressible fluid film model. Unsteady fluid inertia, caused by the high frequency vibration modes of the flexible band, is included in the model. The perturbed pressure is generated by two mechanisms, one caused by the band convection, and the other by the band transverse vibration. Moreover, the pressure generations are governed by fluid impedance functions, which characterize the viscous diffusion across the film. Results for both the transient and steady state responses of the film are presented and discussed. It is shown that the pressure component caused by the band convection, which has not been considered in the literature, is important at low frequency. The pressure component caused by the band transverse vibration is dominant at high frequency.

Research on the Vibration of Sheet Metal near the Zinc Pot Area in Continuous Hot-Dip Galvanizing Line

2011 ◽  
Vol 141 ◽  
pp. 471-477 ◽  
Author(s):  
Pei Min Xu ◽  
Biao Wang ◽  
Jin Jie Ye ◽  
Hai Juan Zhang ◽  
Zhi Lai Huang ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Transverse Vibration ◽  
Cooling Tower ◽  
The Other ◽  
Control Parameters ◽  
Main Factors ◽  
Axially Moving ◽  
Vibration Tests ◽  
Air Knife ◽  
Excited Resonance

Large vibration of the sheet metal near the air knife is one of the main factors controlling the accuracy of thickness of the cladding zinc in continuous hot-dip galvanizing line. Lots of vibration tests are carried out on the strip and main equipments in the zinc pot area of a galvanizing line during downtime and operation in order to diagnose causes of the large vibration of the strip near the air knife. Theoretic foundation of adjustment of control parameters to suppress the strip vibration is established. Main mechanisms of large vibration of the strip are found by the theory of the transverse vibration of axially moving continua. The first one is the resonance of forced vibration induced by support movement aroused by passive rollers’ sloshing in the zinc pot, and the other is the parametrically excited resonance of the strip induced by tension fluctuation enlarged by local structural resonances of the cooling tower.

scholarly journals Nonlinear Models for Transverse Forced Vibration of Axially Moving Viscoelastic Beams

2011 ◽  
Vol 18 (1-2) ◽  
pp. 281-287 ◽  
Author(s):  
Hu Ding ◽  
Li-Qun Chen
Keyword(s):  
Differential Equation ◽  
Partial Differential Equation ◽  
Steady State ◽  
Transverse Vibration ◽  
Nonlinear Models ◽  
Transverse Motion ◽  
Steady State Response ◽  
Partial Differential ◽  
State Response ◽  
Axially Moving

Nonlinear models of transverse vibration of axially moving viscoelastic beams subjected external transverse loads via steady-state periodical response are numerically investigated. An integro-partial-differential equation and a partial-differential equation of transverse motion can be derived respectively from a model of the coupled planar vibration for an axially moving beam. The finite difference scheme is developed to calculate steady-state response for the model of coupled planar and the two models of transverse motion under the simple support boundary. Numerical results indicate that the amplitude of the steady-state response for the model of coupled vibration and two models of transverse vibration predict qualitatively the same tendencies with the changing parameters and the integro-partial-differential equation gives results more closely to the coupled planar vibration.

Nonlinear vibration mechanism for fabrication of crimped nanofibers with bubble electrospinning and stuffer box crimping method

2016 ◽  
Vol 87 (14) ◽  
pp. 1706-1710 ◽  
Author(s):  
Ping Wang ◽  
Peng Liu ◽  
Hai-Yan Kong ◽  
Yan Zhang ◽  
Ji-Huan He
Keyword(s):  
Mechanical Properties ◽  
Finite Deformation ◽  
Transverse Vibration ◽  
Analytical Study ◽  
Viscoelastic Beam ◽  
Governing Equations ◽  
Spinning Process ◽  
Vibration Mechanism ◽  
Axially Moving ◽  
Nonlinear Transverse Vibration

This paper aims to produce nanoscale crimped fibers using stuffer box crimping and bubble electrospinning. Nanofibers are originally obtained via a ruptured bubble and then crimped with the stuffer box crimping method. During this spinning process, the governing equations for nonlinear transverse vibration of an axially moving viscoelastic beam with finite deformation are established using the Hamiltonian principle. The crimp frequency is affected by many factors, including spinning conditions and mechanical properties of fibers. The obtained governing equations can be further used for numerical or analytical study of the crimping mechanism.

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