scholarly journals Modeling of Thermodynamic Properties for Pure Refrigerants and Refrigerant Mixtures by Using the Helmholtz Equation of State and Cubic Spline Curve Fitting Method

2015 ◽  
Vol 3 (6) ◽  
pp. 229-251 ◽  
Author(s):  
Halil Atalay ◽  
M. Turhan Coban
2019 ◽  
Vol 894 ◽  
pp. 34-40
Author(s):  
Trong Linh Nguyen ◽  
Yu Ren Wu

The sealing line between two conjugated rotors is a main leakage path in the vacuum pump, however, it is unable to be adjusted before the rotor profiles are determined in the traditional rotor profile generation method. Therefore, a generation method of rotor profiles for claw-type vacuum pumps based on the sealing line is proposed in this paper. The sealing line can be firstly specified as specific segments regarding the characteristics of claw-shaped rotor profiles. By applying the enveloping theory and the cubic spline curve fitting method, the rotor profile is able to be generated from the sealing line. Moreover, the adjustment method is proposed to segmentally correct the shape of sealing line using the quadratic functions by considering the geometric limitations to avoid interference and undercutting in rotor profiles. A three-lobe claw rotors profile is carried out to demonstrate the reasonability and stability of the proposed method.


2010 ◽  
Vol 26 (6-8) ◽  
pp. 801-811 ◽  
Author(s):  
Mingxiao Hu ◽  
Jieqing Feng ◽  
Jianmin Zheng

2013 ◽  
Vol 365-366 ◽  
pp. 99-103
Author(s):  
Shi Jun Ji ◽  
Ji Zhao ◽  
Lei Zhang ◽  
Hui Juan Yu ◽  
Xiao Long Liu ◽  
...  

With the development of CAD/CAM, reverse engineering, geometric modeling, animation and computer graphics. In the past fifty years, many kinds of spline curve fitting methods have been produced. But, to authors knowledge, quality evaluation criterion about different spline curves are still not established and there is a lack of a comparing standard for analyzing different spline curves. Two spline curve fitting method comparing theorem is given and several various spline curves affecting factors are analyzed in this paper. Some comparable results are obtained by using the proposed quality evaluating theorem to different spline curves.


2003 ◽  
Author(s):  
Hong-Dun Lin ◽  
Hsiao-Ling Huang ◽  
Yuan-Yu Hsu ◽  
Chi-Chen Chen ◽  
Ing-Yi Chen ◽  
...  

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