A5023905967- Tribology and Lubrication Engineering
- Gear and Bearing Dynamics Analysis
- Hydraulic and Pneumatic Systems
- Magnetic Bearings and Levitation Dynamics
- Adhesion, Friction, and Surface Interactions
- Control Systems in Engineering
- Advanced Surface Polishing Techniques
- Electric Vehicles and Infrastructure
- Advanced Measurement and Metrology Techniques
- Iterative Learning Control Systems
- Sensorless Control of Electric Motors
- Lubricants and Their Additives
- Advanced machining processes and optimization
- Laser Material Processing Techniques
- Oil and Gas Production Techniques
- Laser and Thermal Forming Techniques
- Surface Modification and Superhydrophobicity
- Welding Techniques and Residual Stresses
Huazhong University of Science and Technology
2016-2021
China Academy of Engineering Physics
2020
In this paper, a detailed model of motion stage driven by iron-less permanent magnet linear synchronous motor (PMLSM) and supported rolling guides are presented. This is prototype the feeding system for precise turning machine tool. model, there two categories disturbances including slow-varying ones mainly produced thrust ripple PMLSM abrupt-changing caused nonlinear friction guide. To overcome these disturbances, simple, effective practical servo control method based on general-purpose...
Abstract In this study, we observe that there are two threshold speeds (stability speed and second speed) for the long journal bearing, which is different short bearing. When rotating below stability speed, boundary nearly coincides with clearance circle, center gradually returns to equilibrium point after being released at an initial point. If between point, converges a contour containing situation, higher corresponding also larger. exceeds moves towards bearing surface
An investigation on full fluid film lubrication assuming non-Gaussian-distributed surface roughness has been conducted. A typical slider bearing is chosen as the research object. Edgeworth expansion containing skewness and kurtosis introduced to approximate density function. Using Christensen's stochastic model, effects of direction non-Gaussian distribution properties working performance bearings have quantitatively analyzed. The results show that variation range caused by up 9.82%. Effects...
In the previous studies on hydrostatic thrust bearing, differences between theoretical results and experimental are obvious when inertia parameter S ratio of supply hole radius to bearing r 0 / R become large enough. To explain differences, in this study, effect region is considered discussing static characteristics then new expressions pressure, load capacity, flow rate given. For continuous parallel study agree well with experiments, thus there no need for extra modified theory. step a...
Influence of dissimilar radial clearances the two end bearings on performance hydrodynamic rotor-bearing systems is investigated in present paper. The rotor misalignment effects are considered. A parameter ξ introduced to measure level and three typical applied points ( Case Left, Center, Right) external load also during analysis. Finite difference method adopted solve Reynolds-type equation verification solution technique conducted by comparison with previous work. equilibrium postures...
A high-performance and finite-length bearing system requires that the shaft can be stabilized even under a strong perturbation. The linear stability theory neglects effects of nonlinear forces initial point shaft. Therefore, is largely determined by rotating speed In present numerical investigation, are accounted for to obtain boundary. objective this study extended orifice-compensated hole-entry hybrid journal bearings with finite length. critical center trajectory acquired solving Reynolds...
Abstract In this study, the influence of inlet pocket size on static performance non-Newtonian lubricated hole-entry hybrid journal bearings is theoretically analyzed. The oil film bearing discretized into a nonuniform mesh containing geometric characteristics pocket, and treated as micro-oil recess. Reynolds equation solved by finite element method based Galerkin's techniques, new solution strategy to solve recess/pocket pressure proposed. power-law model used introduce effect. results show...
Abstract The purpose of this paper is to establish a 3D virtual grinding wheel illustrate the high-speed cylindrical process difficult-to-machine materials under various parameters. Based on Monte Carlo method, abrasive grain modeled cutting spherical solid with random planes, and distribution grains obtained based grid method. Then topography trimmed adjust protrusion height grains. simulations different conditions are carried out considering thermomechanical coupling effect workpiece....
The purpose of this paper is to show the results parametric experiments about thermohydrodynamic performance steady-state loaded hole-entry hybrid bearing. Because there are many available theoretical in that respect have been studied, it become an urgent need do related experimental researches. In present study, internal pressure and temperature distribution, flow rate shaft center position under different supply pressures were measured. At same time, a series tests load speed conditions...