scholarly journals Generation of Point-contact State Space between Strictly Curved Objects

2006 ◽  
Author(s):  
P. Tang ◽  
J. Xiao
Keyword(s):  
State Space ◽  
Point Contact ◽  
Contact State ◽  
Curved Objects

scholarly journals Contact analysis for dual peg-in-hole assembly of automobile alternator frame

2020 ◽  
Vol 21 (2) ◽  
pp. 209
Author(s):  
Bo Zhou ◽  
Lijun Liu ◽  
Guangyuan Chen
Keyword(s):  
Three Dimensional ◽  
Point Contact ◽  
Contact Problems ◽  
Assembly Model ◽  
Modeling And Analysis ◽  
Contact State ◽  
Force Moment ◽  
Assembly Problem ◽  
The Relationship

The modeling and analysis of the assembly contact problems in the picking and placement of the automobile alternator frame are carried out in the multi-station processing. According to the three-dimensional assembly characteristics of the actual alternator frame and the fixture, the assembly model in the drilling and milling station is simplified. The alternator frame and fixture assembly problem as a whole is simplified to a dual peg-in-hole assembly problem. All possible one-point contact states and two-point contact states during the assembly process are proposed(L-1)∼(R-10). The contact force analysis is carried out on the typical one-contact state L-1 and the typical two-point contact state L-5, and the relationship between the corresponding assembly forces Fx, Fy, Fz and the assembly moments Mx, My, Mz is obtained. According to the relationship between these assembly forces and assembly moments, the corresponding jamming diagrams are obtained. Finally, according to the three-dimensional size of the actual alternator frame, the experimental verification was carried out by using a 6-DOF force/moment sensor. The experimental results confirmed the validity of the analysis. Technical support is provided for the assembly of automobile alternator frames based on force sensing control for the follow-up work.

Analysis of Heating Performances for Ultra-High Speed Electric Spindle Bearings Based on the Energy Theory of TEHL in Point Contact State

2010 ◽  
Vol 37-38 ◽  
pp. 135-140
Author(s):  
Song Sheng Li ◽  
Zhi Hong Hu ◽  
Peng Zhou ◽  
Peng Chen ◽  
Xiao Yang Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Hydrodynamic Lubrication ◽  
Point Contact ◽  
Rolling Bearing ◽  
Total Quality ◽  
Contact State ◽  
Ultra High Speed ◽  
Air Lubrication ◽  
To Come

To analyze the lubricating state and the heating performances of the spindle bearings in ultra-high speed electric spindles, taken the characteristics of oil-air lubrication into account and based on the theories about rolling bearing dynamics and thermal elasto-hydrodynamic lubrication in point contact state, a model was built with the energy method for analyzing the heating performances the ball elements on both raceways in spindle bearings. An equation was derived for calculating the total quality of heat produced in a bearing. The influences of some basic factors such as the running speed, the axial preload, the oil viscidity, the design contact angle of bearing, and the ball materials and so on are analyzed on the heating performances in a bearing. The results show that it is easy to come into being elasto-hydrodynamic lubrication state for a bearing running in an ultra high-speed and lubricated by oil-air. It is also shown that the higher speed is, the more the quality of heat produced inside the oil films in the elasto-hydrodynamic lubrication state will be, which will bring the bearings working conditions worse.

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