scholarly journals Research on Static and Dynamic Characteristics of Gas-lubricated Microbearings for Microfluidic Devices

2020 ◽  
Vol 10 (5) ◽  
pp. 1634 ◽  
Author(s):  
Yao Wu ◽  
Lihua Yang ◽  
Wei Wu ◽  
Tengfei Xu
Keyword(s):  
Knudsen Number ◽  
Dynamic Characteristics ◽  
Microfluidic Devices ◽  
Iteration Algorithm ◽  
Static And Dynamic Characteristics ◽  
Operating Stability ◽  
Direct Stiffness ◽  
Boltzmann Model ◽  
Relaxation Iteration ◽  
Film Lubrication

Aerodynamic journal microbearings with microtribological phenomena significantly influence the operating stability of microfluidic devices. The modified Reynolds equations including different rarefaction models are derived and are solved by the partial derivative method and relaxation iteration algorithm. The effects of Knudsen number and bearing parameters on the static and dynamic characteristics of microbearings are investigated in detail. The results show that the rarefaction effect plays a crucial role in the ultra-thin gas film lubrication. The maximum film pressure of Fukui–Kaneko (FK) model is lowest and the result in Boltzmann model is largest in small Knudsen number regions. As the Knudsen number increases further, the curve of FK model is coincident with that of the Boltzmann model in the transition regime. The direct stiffness coefficients of Boltzmann model increase with the increase of eccentricity ratio and aspect ratio, whereas the effect of Knudsen number on the damping coefficients yields a relatively complicated trend.

Invited PaperTemperature dependence of SiGe HBT static and dynamic characteristics

1998 ◽  
Vol 08 (PR3) ◽  
pp. Pr3-81-Pr3-86
Author(s):  
F. Aniel ◽  
N. Zerounian ◽  
A. Gruhle ◽  
C. Mähner ◽  
G. Vernet ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Static And Dynamic Characteristics ◽  
Sige Hbt

Analysis and Optimization of the Static and Dynamic Characteristics of Head Frame

2011 ◽  
Vol 418-420 ◽  
pp. 2055-2059 ◽  
Author(s):  
Yu Lin Wang ◽  
Na Jin ◽  
Kai Liao ◽  
Rui Jin Guo ◽  
Hu Tian Feng
Keyword(s):  
Machine Tool ◽  
Dynamic Characteristics ◽  
Maximum Stress ◽  
Dynamic Performance ◽  
Mode Shapes ◽  
Cnc Machine ◽  
Static And Dynamic Characteristics ◽  
Maximum Deformation ◽  
Improvement Measures ◽  
Optimal Measure

The head frame is a key component which plays a supportive and accommodative role in the spindle system of CNC machine tool. Improving the static and dynamic characteristics has profound significance to the development of machine tool and product performance. The simplified finite element modal is established with ANSYS to carry out the static and modal analysis. The results showed that the maximum deformation of the head frame was 0.0066mm, the maximum stress was 3.94Mpa, the deformation of most region was no more than 0.0007mm, which all verified that the head frame had a good stiffness and deforming resistance; several improvement measures for dynamic performance were also proposed by analyzing the mode shapes, and the 1st order natural frequency increased 7.33% while the head frame mass only increased 1.58% applying the optimal measure, which improved the dynamic characteristics of the head frame effectively.

Modeling and Simulation of Hydromechanically Constant Power Controlled Swash Plate Pumps

2006 ◽  
Author(s):  
Saad A. Kassem ◽  
Yasser H. Anis
Keyword(s):  
Mathematical Models ◽  
Modeling And Simulation ◽  
Dynamic Characteristics ◽  
Theoretical Study ◽  
Constant Power ◽  
Static And Dynamic Characteristics ◽  
Valve Spring ◽  
Lever Arm ◽  
Swash Plate ◽  
Static Performance

This paper presents a theoretical study of the performance of constant power operated swash plate pumps equipped with hydromechanical controllers incorporating either pivoted levers or two feedback springs. Mathematical models of these controllers are derived and used to simulate the static and dynamic characteristics of a small pump of 40 cc/rev geometric volume. Results show that the controller with the pivoted lever renders better static and dynamic characteristics compared to the controllers with feedback springs. Results also show that changing the power through varying the lever arm length is preferable than varying the valve spring initial compression, when the dynamic characteristics of the pumps with controllers of pivoted levers are considered. The effect of the valve spring initial compression on the static performance of a pump incorporating a controller with two feedback springs is also investigated.

Static and Dynamic Characteristics of XPL Programs

Computer ◽  
1975 ◽  
Vol 8 (11) ◽  
pp. 41-46 ◽  
Author(s):  
W.G. Alexander ◽  
D.B. Wortman
Keyword(s):  
Dynamic Characteristics ◽  
Static And Dynamic Characteristics
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