An experimental study on oil-film dynamic coefficients

Hua, Zhou; Zhao, Sanxing; Xu, Hua; Zhu, Jing

doi:10.1016/j.triboint.2003.08.002

Cited by 44 publications

(26 citation statements)

References 9 publications

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“…By means of signal processing, a series of data of the bearing gas film force variation, relative displacement, and relative velocity of the bearing are obtained. Finally, the dynamic stiffness and the equivalent damping coefficient of the bearing are obtained by the least squares method [5]. Under the microperturbation, the variation of the theoretical gas film force ΔW 1 of the bearing can be expressed as a function of the displacement Δh and velocity Δ _ h of the aerostatic bearing deviating from the steady working point, which is expressed as follows:…”

Section: Experimental Data Processing Methodmentioning

confidence: 99%

“…, (5) where Q in is the mass flow in, Q out is the mass flow out, g is the acceleration due to gravity, μ is the dynamic viscosity, p o is the outlet pressure, p s is the supply pressure, T 0 is the temperature, R g is the gas constant, k is the adiabatic index, C 0 is the flow coefficient, d is the orifice diameter, and Ψ is the flow velocity coefficient.…”

Section: Gas-solidmentioning

confidence: 99%

“…During the loading process, the air film of the aerostatic bearing is easily affected by the shock and vibration of the outside, which leads to the obvious weakening of the working stability of the aerostatic bearing [5]. erefore, the analysis and study of the dynamic characteristics of the bearing are particularly important when it is affected by the external impact.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study on Dynamic Characteristics of Aerostatic Bearing with Elastic Equalizing Pressure Groove

Zhao

Hao

Zhou

et al. 2018

Shock and Vibration

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Microvibration has an important influence on the dynamic performance of aerostatic bearings. Dynamic stiffness and equivalent damping coefficient are the main indexes to evaluate the dynamic characteristics of the aerostatic bearing. In order to study the dynamic characteristics of a new type of aerostatic bearing with the elastic equalizing pressure groove (EEPG), the dynamic characteristics of the new type of bearing are studied by theoretical calculation and experiment. First, the dynamic gas-solid coupling control equation is established.en, the steady term and the perturbation term are decomposed by the perturbation method. By solving the coupling model, the dynamic characteristics of the bearing are calculated and analyzed.e calculation results show that the perturbation frequency has a significant effect on the dynamic stiffness and equivalent damping coefficient of the aerostatic bearing with EEPG. e dynamic stiffness increases with the increase of frequency, and the equivalent damping coefficient decreases with the increase of frequency. e experimental results are basically the same with the theoretical results, which effectively verify the correctness of the theoretical analysis.

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Section: Experimental Data Processing Methodmentioning

confidence: 99%

Section: Gas-solidmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study on Dynamic Characteristics of Aerostatic Bearing with Elastic Equalizing Pressure Groove

Zhao

Hao

Zhou

et al. 2018

Shock and Vibration

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“…The flow on the edge of the oil seal can be simplified to two rectangular parallel plates with the upper and lower plate spacing h, and the lower base plate is regularly distributed with four I-shaped oil chambers. And make the following assumptions [3,4] :…”

Section: Physical Modelmentioning

confidence: 99%

Numerical Study on Dynamic Stiffness hydrostatic bearing

Wang¹,

Li²,

Wen³

2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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Abstract:The numerical simulation of the hydrostatic bearing of the fluctuating load is carried out by Ansys cfx. The variation law of the oil film thickness with the load is obtained and compared with the static formula. It reveals the influence of periodic variation of the load displacement interface table. The results show that under the fluctuating load, the oil film thickness, the bearing capacity and the dynamic stiffness are changed to some extent, which also provides the important basis for the reliability design of the hydrostatic bearing.

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“…The impact excitation method for evaluating sixteen dynamic coefficients of two asymmetric bearings from the impulse responses based on a test rig was introduced by Qiu et al [2]. Zhou [3] used sinusoidal excitation to recognize dynamic coefficients for five-pad TPJBs. All experimental tests were executed on a special test rig with a diameter of 152 mm.…”

Section: Introductionmentioning

confidence: 99%