Centrifugal force induced dynamics of a motorized high-speed spindle

2005 ◽  
Vol 30 (1-2) ◽  
pp. 10-19 ◽  
Author(s):  
Jenq-Shyong Chen ◽  
Yii-Wen Hwang
Keyword(s):  
Centrifugal Force ◽  
High Speed

Design and Strength Analysis of Ultra-High Speed Permanent Magnet DC Rotor

2011 ◽  
Vol 188 ◽  
pp. 481-486 ◽  
Author(s):  
J.C. Xiao ◽  
S.H. Xiao ◽  
H. Wu
Keyword(s):  
Finite Element ◽  
Centrifugal Force ◽  
High Speed ◽  
Rotational Velocity ◽  
Contact Theory ◽  
Strength Analysis ◽  
Interference Fit ◽  
Rotating Speed ◽  
Shrink Fitting ◽  
Nonmagnetic Steel

The sintered neodymium-iron-boron (Nd-Fe-B) material is used in most of PM machines. The kind of PM materials has small tensile strength and cannot withstand large centrifugal force due to high rotational velocity. A nonmagnetic steel enclosure is needed to cover the PM material. The tensile stress of the PM can reduced by pre-pressure applied to the outer surface of the PM through shrink-fitting into the enclosure. Based on the elasticity theory and the elastic-plastic contact theory, in soft ANSYS it is feasibility to establish a finite element mechanical model of interference fit between the enclosure and motor rotor PM at high rotating speed. This paper simulates the effects of the temperature and rotating speed (centrifugal force) on the displacement and the contact pressure on the interference-fitting surfaces .By finite element non-linear contact model analysis, if setting up right fit clearance, this paper could ensure the security of the PM rotor under rotational velocity up to 300,000 r/min high and temperature up to 150°C.

Chatter Stability of Micro-Milling by Considering the Centrifugal Force and Gyroscopic Effect of the Spindle

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Xiaohong Lu ◽  
Zhenyuan Jia ◽  
Shengqian Liu ◽  
Kun Yang ◽  
Yixuan Feng ◽  
...  
Keyword(s):  
Centrifugal Force ◽  
High Speed ◽  
Beam Theory ◽  
Milling Process ◽  
System Structure ◽  
Micro Milling ◽  
Gyroscopic Effect ◽  
Good Surface ◽  
Receptance Coupling ◽  
Milling Tool

Abstract In the micro-milling process, the minimization of tool chatter is critical for good surface finish quality. The analysis of chatter requires an understanding of the milling tool as well as the dynamics of milling system structure. Frequency response function (FRF) at the micro-milling tool point reflects dynamic behavior of the whole micro-milling machine–spindle–tool system. However, the tool point FRF of micro-milling cannot be obtained directly through the hammering test. To solve the problem, the authors get the FRF of the spindle system based on the rotating Timoshenko beam theory and the receptance coupling substructure analysis (RCSA), and the bearing characteristics are added into the spindle model through structural modification. Then, the centrifugal force and gyroscopic effect caused by the high-speed rotation of the micro-milling spindle are considered to better simulate the real scenario and increase the accuracy of modal parameters. The method has general usage and can be applied to all the micro-milling tools under which only the spindle dimension, bearing characteristics, and contact parameters need to be changed.

scholarly journals A HIGH SPEED VACUUM CENTRIFUGE SUITABLE FOR THE STUDY OF FILTERABLE VIRUSES

1936 ◽  
Vol 64 (4) ◽  
pp. 503-528 ◽  
Author(s):  
Johannes H. Bauer ◽  
Edward G. Pickels
Keyword(s):  
Centrifugal Force ◽  
Yellow Fever ◽  
High Speed ◽  
Yellow Fever Virus ◽  
High Vacuum ◽  
Fever Virus ◽  
Compressed Air ◽  
Frictional Heat ◽  
High Speeds ◽  
Very High

1. A high speed centrifuge is described in which the speed is limited only by the strength of the material of which the rotor is made. It carries sixteen tubes, each of which conveniently accommodates 7 cc. of fluid. 2. The centrifuge operates in a very high vacuum and therefore requires only a small amount of driving energy. The arrangement has been found to eliminate the possibility of producing injurious frictional heat. 3. The rotating parts are supported by anair-bearing and are driven by compressed air. 4. The centrifuge has been successfully operated at a speed of 30,000 revolutions per minute, representing a maximum centrifugal force in the fluid of 95,000 times gravity. 5 Celluloid tubes used for centrifugation of fluid at high speeds are described. 6. Experiments are described in which good sedimentation of the yellow fever virus was obtained.

scholarly journals The Influence of Centrifugal Force on the Interference Fit of High-Speed Electric Spindle

2020 ◽  
Vol 08 (04) ◽  
pp. 792-799
Author(s):  
Chao Ding ◽  
Xiangyang Qi ◽  
Zhen Gao ◽  
Lei Chang
Keyword(s):  
Centrifugal Force ◽  
High Speed ◽  
Interference Fit

Modal Comparison of Crankshaft under Multi-Speed

2014 ◽  
Vol 533 ◽  
pp. 48-51
Author(s):  
Ran Ran Wang ◽  
Xian Bin Teng ◽  
Yan Ming Xu ◽  
Tao Ge
Keyword(s):  
Centrifugal Force ◽  
Vibration Frequency ◽  
Rotational Speed ◽  
High Speed ◽  
Vibration Mode ◽  
Large Deviation ◽  
Frequency Change ◽  
Low Speed ◽  
The Impact

Considering the effect of centrifugal force generated by the rotation to the crankshaft frequency and vibration mode, the frequency and vibration mode of multi-speed cases are calculated. The results showed that the impact of the centrifugal force on the crankshaft vibration increases with the increase of rotational speed, especially in the high speed region, this phenomenon is more obvious. From low speed to high speed, the vibration frequency has a large deviation, which shows that in this case, it is necessary to consider the frequency change caused by pre-stress.

Contouring the Tire Sidewall with Moire

1974 ◽  
Vol 2 (1) ◽  
pp. 18-39 ◽  
Author(s):  
A. L. Browne
Keyword(s):  
Experimental Method ◽  
Centrifugal Force ◽  
Static Loading ◽  
High Speed ◽  
Standing Waves ◽  
Operating Conditions ◽  
Pneumatic Tire ◽  
Normal Operating ◽  
Applied Forces ◽  
Centrifugal Loading

Abstract Knowledge of the tire sidewall deformation is necessary for accurate modeling of the response of a pneumatic tire to applied forces. An experimental method, the moire fringe technique, is described which permits the contouring of the tire surface under all normal operating conditions. Results are presented for a series of tests which were conducted to determine the tire sidewall deformation due to static loading, centrifugal force, combined vertical and centrifugal loading, and high speed operation (during which standing waves are present in the tire sidewall).

Optimum Design of Radial-Flow Impellers

1989 ◽  
Vol 203 (4) ◽  
pp. 229-232
Author(s):  
G S Ray ◽  
B K Sinha ◽  
S Majumdar
Keyword(s):  
Optimum Design ◽  
Centrifugal Force ◽  
Computer Aided Design ◽  
High Speed ◽  
Radial Flow ◽  
Design Stage ◽  
Early Design ◽  
Early Design Stage ◽  
Computer Aided ◽  
Aided Design

The paper presents a procedure of computer aided design of high-speed impellers. The configurations are obtained using programs for the strength under the influence of centrifugal force within given constraints. The method provides a tool for optimizing stresses at an early design stage.

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