Study on the Dynamic Characteristics of Ultrahigh Speed Grinding Spindle Based on Squeeze Film Damping Technology

2009 ◽  
Vol 416 ◽  
pp. 123-126
Author(s):  
Tian Biao Yu ◽  
Ya Dong Gong ◽  
Hu Li ◽  
Wan Shan Wang
Keyword(s):  
Design Method ◽  
New Technology ◽  
Equations Of Motion ◽  
Squeeze Film ◽  
Design Parameters ◽  
Grinding Wheel ◽  
Squeeze Film Damper ◽  
Squeeze Film Damping ◽  
Working Principle ◽  
Set Up

For improving grinding quality of ultrahigh speed grinding a new design method for ultrahigh speed grinding spindle is put forwarded based on squeeze film damping technology. Working principle of squeeze film damper of ultrahigh speed grinding spindle is study and differential equations of motion of the ultrahigh speed grinding wheel spindle with a squeeze film damper are set up according to d'Alembert principle. Effects of design parameters of the damper on the motion section of the spindle are studied by the way of simulation based on it. Research works show that the dynamic characteristic of ultrahigh speed grinding spindle can be improved well through adding a squeeze film damper. Research works provides a new technology for the design of the ultrahigh speed grinding spindle system.

Experimental Study of the Ultrahigh Speed Grinding Spindle System with a Squeeze Film Damper

2008 ◽  
Vol 375-376 ◽  
pp. 658-662
Author(s):  
Tian Biao Yu ◽  
Ya Dong Gong ◽  
Shuang Liang ◽  
Guang Qi Cai ◽  
Wan Shan Wang
Keyword(s):  
Experimental Study ◽  
New Technology ◽  
Squeeze Film ◽  
Grinding Wheel ◽  
Spindle System ◽  
Squeeze Film Damper ◽  
Squeeze Film Damping ◽  
Study Results ◽  
Series Of Experiments

In order to improve the attenuation ability of grinding wheel spindle and manufacturing quality of workpiece, an ultrahigh speed grinding spindle system with a SFD was designed based on the theory of squeeze film damping, and a series of experiments were done. The study results show that the application of SFD technology can effectively restrain vibration which is caused by the imbalance quality when the grinding wheel spindle turning at ultrahigh speed. And the speed of the grinding spindle is higher and the effect of attenuation of SFD to grinding spindle is better. Research works provides a new technology for the design of the ultrahigh speed grinding spindle system.

Deep Hole Honing Based on Squeeze Film Damping Technology

2009 ◽  
Vol 76-78 ◽  
pp. 252-257
Author(s):  
Tian Biao Yu ◽  
Ya Dong Gong ◽  
Wan Shan Wang
Keyword(s):  
Differential Equation ◽  
Experimental Result ◽  
Squeeze Film ◽  
Design Parameters ◽  
Improve Quality ◽  
Deep Hole ◽  
Squeeze Film Damper ◽  
Squeeze Film Damping ◽  
Hole Machining

In order to improve quality of deep hole machining, a new method of deep hole honing based on squeeze film damping technology is put forward. For analysis effect on damper parameters on honing quality, motion differential equation of honing spindle with a squeeze film damper (SFD) is established according to D' Alembert principle and according simulations are studied. Spindle of deep hole honing with a SFD is designed based on the result of simulations and experiments are carried on. Experimental result shows that SFD with reasonable design parameters has excellent damping function to honing spindle, and it can make the vibration of honing spindle reduced 20%～30% and the quality of deep hole machining improved 10%～20%.

Study on the Ultrahigh Speed Grinding of Superhard Materials with Squeeze Film Damping Technology

2010 ◽  
Vol 638-642 ◽  
pp. 2369-2374
Author(s):  
Tian Biao Yu ◽  
Hu Li ◽  
Jian Yu Yang ◽  
Wan Shan Wang
Keyword(s):  
Pressure Distribution ◽  
Experimental Result ◽  
Squeeze Film ◽  
Grinding Wheel ◽  
Superhard Materials ◽  
Squeeze Film Damper ◽  
Machining Quality ◽  
Squeeze Film Damping ◽  
Theory Research

In order to further improve machining quality of superhard materials, it was presented that adds a squeeze film damper on the wheel spindle of ultrahigh speed grinder as a assistant elastic sustain to attenuate the vibration of the wheel spindle. Work principle of squeeze film damper was analyzed; the squeeze film pressure distribution was researched through simulation and damper parameters effect on damping coefficient was studied. Base on the theory research the damper was designed and experiments was done. Experimental result shows the amplitude of the grinding wheel spindle can be reduced 20% and machining quality of superhard materials can be improved 10%～20%. Research works provides a new method for superhard materials machining.

Experimental Study on Precision Hole Machining with Squeeze Film Damping Technology

2007 ◽  
Vol 339 ◽  
pp. 90-94
Author(s):  
Tian Biao Yu ◽  
Ya Dong Gong ◽  
J. Liu ◽  
F. Xu ◽  
Wan Shan Wang
Keyword(s):  
Squeeze Film ◽  
Grinding Wheel ◽  
Important Research ◽  
Work Efficiency ◽  
Squeeze Film Damper ◽  
Squeeze Film Damping ◽  
Time Work ◽  
Precision Hole ◽  
Damping Theory ◽  
Hole Machining

A grinding wheel spindle with squeeze film damper—SFD is designed based on squeeze film damping theory and relevant grinding experiments have been performed. Experimental results indicate that the rationality of design for SFD can make the vibration of the grinding wheel spindle is reduced by 25%. The precision of hole machining is improved by 20%. At the same time, work efficiency of the grinder can be raised about 15%. So it has very important research value and wide application prospect in the field of machining.

Research of Ultrahigh Speed Grinding Spindle System Based on Squeeze Film Damping Technology

2008 ◽  
Vol 389-390 ◽  
pp. 67-71
Author(s):  
Tian Biao Yu ◽  
Ya Dong Gong ◽  
Hu Li ◽  
Jian Yu Yang ◽  
Wan Shan Wang
Keyword(s):  
Metal Cutting ◽  
New Technology ◽  
Squeeze Film ◽  
Grinding Wheel ◽  
Spindle System ◽  
Squeeze Film Damping ◽  
Stiffness Characteristic ◽  
Study Results ◽  
High Efficient ◽  
Film Stiffness

Ultrahigh speed grinding is a kind of high efficient metal cutting method. In order to improve ability of ultrahigh greed grinding wheel spindle to resist vibration and grinding quality, an ultrahigh speed grinding spindle system with a squeeze film damper (SFD) was designed based on the theory of squeeze film damping technology. Pressure distribution and squeeze film stiffness characteristic of SFD was study by the method of simulation. Based on theory study an ultrahigh speed spindle system with a SFD was designed and experiments were done. The study results show that application of SFD technology can effectively restrain vibration which is caused by the imbalance quality when the grinding wheel spindle turning at ultrahigh speed. And the speed of the grinding spindle is higher and the effect of attenuation of SFD to grinding spindle is better. Research works provides a new technology for the design of the ultrahigh speed grinding spindle system.

Nonlinear Dynamic Study on Effects of Rub-Impact Caused by Oil-Rupture in a Multi-Shafts Turbine With a Squeeze Film Damper

2014 ◽  
Author(s):  
T. N. Shiau ◽  
C. R. Wang ◽  
D. S. Liu ◽  
W. C. Hsu ◽  
T. H. Young
Keyword(s):  
Dynamic Behavior ◽  
Nonlinear Dynamic ◽  
Equations Of Motion ◽  
Rotor System ◽  
Squeeze Film ◽  
Speed Ratio ◽  
Frequency Spectra ◽  
Squeeze Film Damper ◽  
Assumed Mode Method ◽  
Nonlinear Dynamic Behavior

An investigation is carried out the analysis of nonlinear dynamic behavior on effects of rub-impact caused by oil-rupture in a multi-shafts turbine system with a squeeze film damper. Main components of a multi-shafts turbine system includes an outer shaft, an inner shaft, an impeller shaft, ball bearings and a squeeze film damper. In the squeeze film damper, oil forces can be derived from the short bearing approximation and cavitated film assumption. The system equations of motion are formulated by the global assumed mode method (GAMM) and Lagrange’s approach. The nonlinear behavior of a multi-shafts turbine system which includes the trajectories in time domain, frequency spectra, Poincaré maps, and bifurcation diagrams are investigated. Numerical results show that large vibration amplitude is observed in steady state at rotating speed ratio adjacent to the first natural frequency when there is no squeeze film damper. The nonlinear dynamic behavior of a multi-shafts turbine system goes in its way into aperiodic motion due to oil-rupture and it is unlike the usual way (1T = >2T = >4T = >8T etc) as compared to one shaft rotor system. The typical routes of bifurcation to aperiodic motion are observed in a multi-shafts turbine rotor system and they suddenly turn into aperiodic motion from the periodic motion without any transition. Consequently, the increasing of geometric or oil parameters such as clearance or lubricant viscosity will improve the performance of SFD bearing.

Experimental Investigation of the Development of Cavitation in a Squeeze Film Damper

2010 ◽  
Author(s):  
Changhu Xing ◽  
Frank Horvat ◽  
Stefan Moldovan ◽  
Minel J. Braun
Keyword(s):  
High Speed ◽  
Dynamic Properties ◽  
Leaf Shape ◽  
Saturation Pressure ◽  
Angular Speed ◽  
Squeeze Film ◽  
Pressure Curve ◽  
Large Area ◽  
Squeeze Film Damper ◽  
Set Up

When cavitation takes place in the squeeze film damper (SFD), its types and extent affect the performance of the SFD significantly. Thus, a fundamental understanding of the incipience, formation and evolution of this phenomenon becomes important both for predicting the dynamic properties of the damper and for the practitioner designers. A test rig was set up to investigate the formation of the cavitation bubbles during the process of a steady-state operation. By adopting a crankshaft configuration, the SFD journal orbit can be fixed at a specified eccentricity. The journal position and its eccentricity are tracked by means of Bently proximity sensors. When cavitation takes place, its shape and evolution are recorded by a Photron APX-RS high speed camera. With the Dow Corning 200 lubricant, the gaseous bubbles form in a fern-leaf shape even at low whirling speed. The bubbles evolve to a miniature flattened shape and as the angular speed increases, the gaseous cavitation gives way or is joined by vaporous cavitation. With a further increase of whirling speed, the vaporous bubbles can be clearly seen to occupy a large area. The evolution of the cavitation can be explained by the Sommerfeld pressure curve as it relates to the gaseous and vaporous saturation pressure. The experimental results confirm the assumption made by these authors in the previous numerical simulations for the homogeneous cavitation models.

Study on Application of SFD for Deep Hole Machining

2006 ◽  
Vol 304-305 ◽  
pp. 450-454
Author(s):  
Tian Biao Yu ◽  
Ya Dong Gong ◽  
J. Liu ◽  
F. Xu ◽  
Wan Shan Wang
Keyword(s):  
Differential Equation ◽  
Experimental Result ◽  
Squeeze Film ◽  
Grinding Wheel ◽  
Deep Hole ◽  
Work Efficiency ◽  
Squeeze Film Damper ◽  
Machining Precision ◽  
Is Design ◽  
Hole Machining

Based on the shortcoming and deficiency of deep hole machining, a grinding wheel spindle with squeeze film damper—SFD is design based on squeeze film damped theory. The motion differential equation of SFD grinding wheel spindle is constituted according to D’ Ale mbert principle，and a lot of simulated research has been carried out about the locus of grinding wheel spindle affect by SFD. Founded on the simulated result, the SFD grinding wheel spindle of internal grinder have designed, and the grinding experiments have been performed. Experimental result indicate that the rationality of design for SFD can make the vibration of the grinding wheel spindle reduce 25% , and make machining precision of hole improve 20% , make work efficiency of the grinder raise 15%.

Reduced Order Modeling of the Squeeze Film Damping in MEMS

2006 ◽  
Author(s):  
Aurelio Soma` ◽  
Guido Spinola ◽  
Alberto Ballestra ◽  
Alessandro Pennetta
Keyword(s):  
Finite Element ◽  
Coupled Model ◽  
Reduced Order Modeling ◽  
Squeeze Film ◽  
Design Parameters ◽  
Reduced Order ◽  
Equivalent Damping ◽  
Squeeze Film Damping ◽  
Numerical Finite Element ◽  
Micro Systems

In this work the effect of the Squeeze Film Damping on MEMS structures is studied. When a device is being designed, it is very important to preview with good approximation its dynamic behavior. However, as the simulation of the micro-systems involves different physical domains, the analysis with numerical methods can turn out remarkably onerous. Moreover the Reduced Order Modeling is preferable when, due to technological reasons, the membrane is built with several holes and the geometrical FEM coupled model will be computational heavy. Therefore Reduced Order Models allow to integrate in a total mathematical model the main parameters, obtained by the numerical analysis, considering the behavior of the structure analyzed in different physical domains. In the present work the non-linear coefficients of equivalent damping and stiffness by finite element models are investigated to be exported in a reduced order model. By means of numerical finite element calculation is studied the sensitivity analysis related to design parameters such as dimension of the plate and the presence, or lack, of holes.

Investigation of Squeeze Film Damping and Associated Loads

2017 ◽  
Author(s):  
Per Johansen ◽  
Niels C. Bender ◽  
Anders H. Hansen ◽  
Lasse Schmidt
Keyword(s):  
Squeeze Film ◽  
Design Parameters ◽  
Impact Loads ◽  
Fast Switching ◽  
Damping Effect ◽  
Squeeze Film Damping ◽  
Inherent Feature ◽  
Pressure Dependency ◽  
Gap Height ◽  
The Impact

Digital hydraulics have attracted attention towards fast switching valves and the increased focus on reliable fluid power entail that the lifetime of such valves is of great concern. An inherent feature of most valves for digital hydraulics is that of a mechanical end stop. Consequently, the squeeze film damping associated with end stops of switching valves is an interesting topic. This damping effect is perceived as beneficial for high lifetime and low impact sound, as the consequence of lowering the impact velocity at the mechanical end stops. In this paper the squeeze film damping effect is reviewed with a focus on maximum surface stresses. Using the Barus relation for viscosity-pressure dependency and different film geometries, the classical lubrication theory is applied together with the equation of motion, to obtain the gap height motion equation, both for the iso-viscous and piezo-viscous case. In consequence, this enable insights concerning the influence of piezo-viscosity on this damping effect. These models are used to investigate the loads, which the approaching surfaces experiences. Based on Hertzian theory, comparisons of impact loads and the dynamic squeeze loading are performed, whereby the relation between design parameters and the relative severity of these occurrences are analyzed.

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