The design of a photoionization front experiment using the Z-Machine as a driving source and estimated measurements

2021 ◽  
Vol 28 (9) ◽  
pp. 093304
Author(s):  
H. J. LeFevre ◽  
M. Springstead ◽  
K. Kelso ◽  
R. C. Mancini ◽  
G. P. Loisel ◽  
...  
Keyword(s):  
Driving Source

Analysis of Hybrid Programming Simulation Based on the Variable Stiffness Ring With Expanding Loop SMA Actuator

2017 ◽  
Author(s):  
Lei Wang ◽  
Zong-quan Deng ◽  
Hao-di Wang ◽  
Hong-hao Yue
Keyword(s):  
Thermal Stress ◽  
Elastic Modulus ◽  
Active Control ◽  
Driving Force ◽  
Structure Design ◽  
Smart Structure ◽  
Space Craft ◽  
Stiffness Variation ◽  
Sma Actuator ◽  
Driving Source

In the development of space craft design index, the requirements of hypersonic space craft control accuracy has been increasingly rigorous. Thin-walled structure is often employed in hypersonic craft to reduce the weight of the load and to save the room. During the flight of the craft, temperature field is produced along the surface and the dynamic properties of the craft structure are obviously changed. The decreasing elastic modulus of the structure material and the appearance of thermal stress lead to the decrease of integral rigidity and stability of the structure, then the thermal flutter appears and control difficulties increase. Shape Memory Alloy (SMA) has the advantages of the considerable driving force in the compact volume and the simple driving method. By the combination of actuator structure design and stiffness control, the smart structure is able to make active control to the thermal stiffness variation. In this paper, the apex high-temperature area is equivalent to a ring structure. Finite difference method is employed firstly to transform the governing partial differential equation into discrete finite difference equations. Then the elastic modulus change, thermal stress and tension along the circumference are considered comprehensively to propose the calculation formulas of equivalent young’s modulus. The discrete dynamic matrix model is obtained containing the control terms of SMA. To solve the big-matrix calculation and multiple iterated large data problem, hybrid program is developed with C++ and MATLAB. Finite element software is employed to make optimization analysis to design an expanding loop actuator containing SMA as driving source, variable thickness loops of spring steel as expanding units, and universal-ball pre-loading units. On the basis of that, the thermal stiffness variation active control system with smart structure is developed based on expanding loop SMA actuator. After the analysis of examples, the variation law of the needed SMA driving force is obtained. The distribution position and quantity of the driving source is optimized. This research provides reference for the Theoretical Analysis and Simulation of structure stiffness active control and adaptive control of the aircraft employing smart material. The research results have guiding significance for the smart structure design of hypersonic aircraft in the future.

scholarly journals Electron-Positron Pair Winds from Central Luminous Accretion Disk with Radiation Drag

1998 ◽  
Vol 188 ◽  
pp. 402-403
Author(s):  
Y. Tajima ◽  
J. Fukue
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Accretion Disks ◽  
Radiation Fields ◽  
Pair Plasma ◽  
Electron Positron ◽  
Driving Source ◽  
Electron Positron Pair ◽  
Intense Radiation ◽  
Astrophysical Phenomena

The accretion disks are now supposed to be the main driving source of the active astrophysical phenomena. Even the electron-positron pair plasma will be created at the surface of the sufficiently luminous disk. While the effect of radiation drag which causes in the intense radiation fields around the accretion disk is examined recently. Then, we numerically consider the radiative accelerated pair-winds, which blow off from central luminous accretion disk surrounding a black hole, taking into account radiation drag of the order of v/c.

Develop the System of Three Dimensional Parametric Design of Planetary Gear Reducer Parts Library Base on CS Structure

2014 ◽  
Vol 599-601 ◽  
pp. 560-563
Author(s):  
Guo Ji Zhang ◽  
Gui Yun Meng ◽  
Ming Wei Liu
Keyword(s):  
Parametric Design ◽  
Three Dimensional ◽  
Planetary Gear ◽  
Parametric Function ◽  
Library System ◽  
Development Platform ◽  
Cad System ◽  
Parts Library ◽  
Driving Source

the parts library system of three dimensional parametric design of planetary gear base on CS structure which use SoildWorks as the CAD development platform, which establish the base parts library, can automatically generate the required size specifications of the parts. The parts library adopts template file as the driving source, openness of strong, fast to run, convenient for management and maintenance, is a kind of ideal driven approach so far, this method is also suitable for a parametric function and the development interface of the CAD system, such as Pro/E, UG, etc.

A Design and Research on GMM Precision Flow Pump

2014 ◽  
Vol 602-605 ◽  
pp. 117-121
Author(s):  
De Hui Liu ◽  
Li Wen Liu ◽  
Gang Tang ◽  
Hong Min Wen ◽  
Quan Guo Lu
Keyword(s):  
Maximum Output ◽  
Output Pressure ◽  
Pump Flow ◽  
Magnetostrictive Materials ◽  
Giant Magnetostrictive Materials ◽  
New Type ◽  
Driving Source ◽  
Flow Pump

A new type of the precision flow pump is developed with the giant magnetostrictive materials as the driving source. Experiment has been conducted to test the performance of the pump with designed key components. The pump as the preloading mechanism, adopting an elastomer instead of a spring, not only simplifies the structure, but also improves the performance of the pump. A design is also made to some key components such as the giant magnetostrictive rod and driving coil. The result of experiment shows that the pump flow resolution records 1 ml/min~400ml/min and the maximum output pressure 0.6 MPa, which means the performance of this kind of pump is superior to ordinary diaphragm pumps.

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