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.

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 Deep Hole Honing Based on Squeeze Film Technology

2009 ◽  
Vol 407-408 ◽  
pp. 545-549
Author(s):  
Tian Biao Yu ◽  
Rui Wen ◽  
Ya Dong Gong ◽  
Wan Shan Wang
Keyword(s):  
Experimental Research ◽  
Experimental Result ◽  
Squeeze Film ◽  
Design Parameters ◽  
Improve Quality ◽  
Deep Hole ◽  
Squeeze Film Damper ◽  
Theory Research ◽  
Hole Machining

. In order to improve quality of deep hole finishing, a new method of deep hole honing based on squeeze film technology is put forward. According to fluid lubricates theory, Renault equation of deep hole honing squeeze film damper (SFD) is established, squeeze film force is solved by immense short bearing theory and the effect of the eccentricity of SFD on the damping coefficient is analyzed by MATLAB. Spindle of deep hole honing with SFD is designed based on theory research, and experimental research is carried on. Experimental result shows that SFD with reasonable design parameters has excellent damping function to honing spindle, and it can make vibration of honing spindle reduced 20%～30% and quality of deep hole machining improved 10%～20%.

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.

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%.

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 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.

Sealing Effect on the Performance of Squeeze Film Damper

2009 ◽  
Author(s):  
Changhu Xing ◽  
Minel J. Braun ◽  
Hongmin Li
Keyword(s):  
Pressure Distribution ◽  
Finite Volume ◽  
Piston Ring ◽  
Hydrodynamic Forces ◽  
Squeeze Film ◽  
Squeeze Film Damper ◽  
Damping Coefficients ◽  
End Plate ◽  
Inertia Coefficient ◽  
Ring Seal

Seals used in the squeeze film damper restrict the side leakage of the lubricant, thus providing a measure of additional damping. In this paper, the serrated piston ring and end-plate seals are studied numerically using CFD-ACE+, a commercially available finite volume based algorithm. Research shows that the damping coefficients for the piston ring seal decrease in magnitude with the increase in the number of axial grooves in the circumferential direction until they reach a fairly constant value. However, the pressure distribution and hence the hydrodynamic forces are strongly affected by the number and geometry of the axial grooves. The damping coefficients for the end plate seal increase in magnitude rapidly with the decrease of the seal clearance below the clearance of the damper, but increase slowly when the seal clearance is larger than that of the damper. The direct inertia coefficient increases with the decrease in the seal clearance but the magnitude of cross-coupled inertia coefficients increases with the decrease in the seal clearance, and then falls down towards the values for the infinitely long bearing assumption. Both the damping and inertia coefficients increase with the increase in seal length.

scholarly journals Squeeze Film Damping Effect on Different Microcantilever Probes in Tapping Mode Atomic Force Microscope

Scanning ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Yan Sun ◽  
Jing Liu ◽  
Kejian Wang ◽  
Zheng Wei
Keyword(s):  
Atomic Force Microscope ◽  
Theoretical Models ◽  
Sample Surface ◽  
Squeeze Film ◽  
Simplified Models ◽  
Tapping Mode ◽  
Damping Effect ◽  
Atomic Force ◽  
Squeeze Film Damping

During the operation of tapping mode atomic force microscope (TM-AFM), the gap between the cantilever and sample surface is very small (several nanometers to micrometers). Owing to the small gap distance and high vibration frequency, squeeze film force should be considered in TM-AFM. To explore the mechanism of squeeze film damping in TM-AFM, three theoretical microcantilever simplified models are discussed innovatively herein: tip probe, ball probe, and tipless probe. Experiments and simulations are performed to validate the theoretical models. It is of great significance to improve the image quality of atomic force microscope.

Identification of Force Coefficients in a Squeeze Film Damper With a Mechanical Seal: Large Contact Force

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Adolfo Delgado ◽  
Luis San Andrés
Keyword(s):  
Contact Force ◽  
Test Data ◽  
Dynamic Load ◽  
Unmanned Aircraft ◽  
Squeeze Film ◽  
Radial Clearance ◽  
Mechanical Seal ◽  
Squeeze Film Damper ◽  
Damping Coefficients ◽  
Squeeze Film Damping

Squeeze film dampers (SFDs) aid to reduce excessive vibration levels due to rotor imbalance and to raise stability thresholds in rotor-bearing systems. SFDs commonly include end seals to increase their damping capability with a lesser lubricant flow. Seals also aid to reduce the occurrence of air ingestion/entrapment that severely reduces the damper forced performance. However, most conventional end seals do not completely eliminate lubricant side leakage, which limits their effectiveness to prevent air ingestion. A novel end seal arrangement incorporates a spring loaded, contacting mechanical seal that effectively prevents lubricant side leakage and air ingestion. The mechanically sealed damper is intended for use in power engines for unmanned aircraft vehicles. The test damper journal is 2.54 cm in length and 12.7 cm in diameter, with a radial clearance of 0.127 mm. Prior literature reports dynamic load tests on the seal-SFD and measurements of orbital motions to characterize the mechanical parameters of both the mechanical seal and squeeze film damper section. The test data to date include damper operation for a single contact load (90 N) closing the mechanical seal. Presently, measurements of damper dynamic load performance are conducted with a larger contact force (260 N). A nonlinear parameter identification method in the frequency domain determines simultaneously the squeeze film damping and inertia coefficients and the seal dry-friction force. The test results show that the system equivalent viscous damping coefficients are twice as large as those obtained earlier with the smaller contact force. On the other hand, as expected, the squeeze film damper coefficients are nearly identical for both test configurations. Predicted squeeze film damping coefficients, from an improved model that includes the flow in the damper feed and discharge grooves, correlate well with the test data for small and moderate orbit radii. The experimental fluid added mass coefficients are in par with the actual mass of the bearing housing and accurately predicted.

Air Damping Effects of MEMS Parallel-Plate Structure Using ANSYS Thin Film Analysis

2011 ◽  
Vol 403-408 ◽  
pp. 4588-4592
Author(s):  
Xiong Xing Zhang ◽  
Shou Jun Peng ◽  
Jin Long Zou
Keyword(s):  
Thin Film ◽  
Pressure Distribution ◽  
Operating Frequency ◽  
Squeeze Film ◽  
Film Analysis ◽  
Thin Film Analysis ◽  
Squeeze Film Damping ◽  
Air Damping ◽  
Damping Effects ◽  
Accommodation Factor

ANSYS thin film analysis was adopted to simulate the effects of squeeze film damping. The relation of damping effects versus operating frequency, velocity, material accommodation factor was analyzed, and the gas squeeze film damping and pressure distribution was simulated by steady-state analysis or harmonic analysis. Moreover, pressure distribution of damping effect in plate gap both with perforated holes and without holes, were determined and compared. Simulation results show that operating frequency and the structure of microstructures are the main influencing factors to air damping and perforated holes in plate gap can control stiffness coefficients of squeezed film damping.

Sign in / Sign up

Export Citation Format

Share Document