Static and Dynamic Characteristics of the Aerodynamic Forces on Pitching Airfoils between 0 to 360 degrees Angle of Attack

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.

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Radiation Effects of Heavy Ions on the Static and Dynamic Characteristics of 850 nm High-Speed Vertical Cavity Surface Emitting Lasers

Journal of Luminescence ◽

10.1016/j.jlumin.2021.118136 ◽

2021 ◽

pp. 118136

Author(s):

Xiaoting Shan ◽

Bo Li ◽

Fazhan Zhao ◽

Lei Wang ◽

Yun Sun ◽

...

Keyword(s):

Dynamic Characteristics ◽

Heavy Ions ◽

High Speed ◽

Radiation Effects ◽

Cavity Surface ◽

Static And Dynamic Characteristics ◽

Surface Emitting Lasers ◽

Vertical Cavity Surface ◽

Emitting Lasers ◽

Vertical Cavity

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Modeling and Simulation of Hydromechanically Constant Power Controlled Swash Plate Pumps

Fluid Power Systems and Technology ◽

10.1115/imece2006-14470 ◽

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.

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