Study on the Numerical Computation Method for Inverse Problems and Its Application in Image Processing

2015 ◽  
Author(s):  
Wang Su-Hua
Keyword(s):  
Image Processing ◽  
Inverse Problems ◽  
Numerical Computation ◽  
Computation Method

An airframe/inlet integrated full-waverider vehicle design using as upgraded aerodynamic method

2019 ◽  
Vol 123 (1266) ◽  
pp. 1135-1169 ◽  
Author(s):  
F. Ding ◽  
J. Liu ◽  
W. Huang ◽  
C. Peng ◽  
S. Chen
Keyword(s):  
Shock Wave ◽  
Numerical Computation ◽  
Flow Model ◽  
Design Method ◽  
Basic Flow ◽  
Computation Method ◽  
Aerodynamic Design ◽  
Air Breathing ◽  
Streamline Tracing ◽  
Tracing Method

ABSTRACTWith the aims of overcoming the limitations of the existing basic flow model derived from an axisymmetric generating body and extending the aerodynamic design method of the airframe/inlet integrated waverider vehicle, this study develops an upgraded basic flow model derived from an axisymmetric shock wave. It then upgrades the design method for airframe/inlet integration of an air-breathing hypersonic waverider vehicle, which is termed the ‘full-waverider vehicle’ in this study. In this paper, first, the design principle and method for the upgraded full-waverider vehicle derived from an axisymmetric basic shock wave are described in detail. Second, an upgraded basic flow model that accounts for both internal and external flows is derived from an axisymmetric basic shock wave by use of both the streamline tracing method and the method of characteristics (MOC). Third, the upgraded full-waverider vehicle is developed from the upgraded basic flow model by the streamline tracing method. Fourth, the design theories and methodologies of both the upgraded basic flow model and the upgraded full-waverider vehicle are validated by a numerical computation method. Finally, the aerodynamic performances and viscous effects of both the upgraded basic flow model and the upgraded full-waverider vehicle are analysed by numerical computation. The obtained results show that the upgraded basic flow model and aerodynamic design method are effective for the design of the airframe/inlet integration of an air-breathing hypersonic waverider vehicle.

scholarly journals Computation method of geometry die of stretch forming press

2018 ◽  
Vol 224 ◽  
pp. 04014
Author(s):  
Konstantin Bormotin ◽  
Win Aung
Keyword(s):  
Numerical Methods ◽  
Inverse Problems ◽  
Mathematical Models ◽  
Computation Method ◽  
Stretch Forming ◽  
Shell Forming ◽  
Punch Shape

Mathematical models and numerical methods for solving inverse problems of shell forming by means of stretching on a die have been developed. The algorithms implemented in MSC.Marc allow to calculate the required punch shape. The results of simulation of the stretching technology are presented.

A DETECTIVE STUDY ON PARAXIAL DIGITAL HOLOGRAPHY IN ACQUIRING THE AMPLITUDE AND PHASE SIMULTANEOUSLY

2005 ◽  
Vol 02 (02) ◽  
pp. 93-99
Author(s):  
JUN-CHANG LI ◽  
RONG-XIN GUO ◽  
MIN WANG
Keyword(s):  
Image Processing ◽  
Theoretical Model ◽  
Numerical Computation ◽  
Optical System ◽  
Digital Holography ◽  
Image Processing Techniques ◽  
Measured Object ◽  
Computer Aided ◽  
Processing Techniques

A theoretical model to actualize digital holographic detection with the help of paraxial optical system based on the inverse calculation of diffraction is introduced briefly. In addition, we proposed a method to actualize the measurement when the measured object modulates the amplitude and the phase of object light simultaneously. The simulated experimental example will be illustrated with the help of numerical computation and computer-aided image processing techniques.

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