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Study on the Static and Dynamic Characteristics for the Ladder Recesses Hybrid Bearings with Capillary Throttle

Author: ZhaoZongQin
Tutor: WangYongQin
School: Chongqing University
Course: Mechanical Design and Theory
Keywords: Hybrid Bearing Staircase effect FLUENT Finite Element Method
CLC: TH133.36
Type: Master's thesis
Year: 2011
Downloads: 90
Quote: 1
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Abstract


With modern machinery to large-scale, high-performance, high-speed direction, hydrodynamic radial bearing has been widely used in a variety of rotating machinery. Hybrid bearing large carrying capacity, stable and reliable lubrication properties directly affect the reliability and life to bearing support machine running. Currently, many scholars at home and abroad are also active in the research work of the hybrid bearing, but so far, for hybrid bearing research is still in the exploratory stage, has not yet formed a relatively complete and mature theoretical methods. In order to make more effective use of the hybrid bearing, internal operation mechanism and characteristics of study hydrodynamic bearings, thereby optimizing the structural design of the hybrid bearing is necessary. This article focuses expand capillary restriction based on the static and dynamic pressure bearing characteristics, content and results of research include the following aspects: (1) analysis of pressure bearing components and working principle based on capillary throttling ladder cavity movement, and compare ladder cavity bearing than other cavity-shaped hybrid bearing and hydrodynamic bearings can form a better ladder chamber dynamic pressure effect. Establish a mathematical model of the mechanical properties of the bearing - spindle system. (2) based on MATLAB software, the pressure distribution of the pressure bearing on the ladder cavity movement using the finite element method to solve, calculate the bearing oil film pressure distribution; comparative ladder cavity Hybrid Bearing ladder cavity depth change oil film pressure distribution, and obtained with the most good ladder effect sliding bearing ladder cavity depth. ③ discusses the formation mechanism of the hydrodynamic bearing dynamic coefficients (film stiffness coefficient and oil film damping coefficient), and eight dynamic coefficients obtained using the finite difference method. Finally, according to the determined force coefficient of the bearing stability judgment. Simulate hydrodynamic ladder inside the cavity bearing the three-dimensional flow mathematical model and boundary conditions, (4) in GAMBIT and FLUENT software selection laminar flow model, separate solver bearing pressure and temperature distribution is solved. Numerical examples comparing calculated using the FLUENT pressure distribution and temperature distribution with the numerical method to calculate the results are similar, more in line with the actual operating conditions. And analysis of the impact of changes in the eccentricity of the bearing of the maximum pressure and maximum temperature rise, carrying capacity and deviation angle. Capillary restriction ladder cavity Hybrid Bearing-based research methods and research carried out for the development of a new movement, pressure bearing provides reference, research on hybrid bearing structure design and operating conditions of guiding significance.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Moving parts > Bearing > Hydrostatic bearing
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