A Completely Theoretical Design Method of Dielectric Image Guide Gratings in the Bragg Reflection Region

1986 ◽  
Vol 34 (4) ◽  
pp. 420-426 ◽  
Author(s):  
H. Shigesawa ◽  
M. Tsuji
Keyword(s):  
Design Method ◽  
Bragg Reflection ◽  
Image Guide ◽  
Theoretical Design

scholarly journals Robust optimization design of structures based on the specular reflection algorithm

2019 ◽  
Vol 11 (3) ◽  
pp. 168781401983413
Author(s):  
Qisong Qi ◽  
Qing Dong ◽  
Yunsheng Xin
Keyword(s):  
Robust Design ◽  
Structural Design ◽  
Optimization Design ◽  
Design Method ◽  
Specular Reflection ◽  
Design Parameters ◽  
Theoretical Design ◽  
Recent Advancement ◽  
Robust Optimization Design ◽  
Robust Design Method

The nominal values of structural design parameters are usually calculated using a traditional deterministic optimization design method. However, owing to the failure of this type of method to consider potential variations in design parameters, the theoretical design results can be far from reality. To address this problem, the specular reflection algorithm, a recent advancement in intelligence optimization, is used in conjunction with a robust design method based on sensitivity. This method not only is able to fully consider the influence of parameter uncertainty on the design results but also has strong applicability. The effectiveness of the proposed method is verified by numerical examples, and the results show that the robust design method can significantly improve the reliability of the structure.

Study on Meshing Characteristic and CAM Technology of Eccentric Involute Gears

2012 ◽  
Vol 479-481 ◽  
pp. 917-920
Author(s):  
Yong Ping Liu ◽  
Peng Fei Meng ◽  
Chi Bing Hu
Keyword(s):  
Design Method ◽  
Shape Design ◽  
Digital Manufacturing ◽  
Transmission Characteristics ◽  
Systemic Theory ◽  
Theoretical Design ◽  
Parameterized Modeling ◽  
Involute Gears ◽  
Noncircular Gears ◽  
Pitch Curve

According to the meshing principle of noncircular gears, the meshing characteristic and digital manufacturing technology of eccentric involute gears is studied. Based on analyzing the parameterized modeling of pitch curve, transmission characteristics and convex-concave property on eccentric involute gears, the transmission feasibility of this type gear is proved. Through tooth shape design, CAM calculation and processing simulation, the validity and manufacturability of theoretical design method on this type gear is proved. The research results can provide more systemic theory basis for the design, manufacture, measure and application of eccentric involute gears.

Study on the Properties of New Ultrasonic Vibration Internal Grinding System

2009 ◽  
Vol 416 ◽  
pp. 142-148 ◽  
Author(s):  
Hua Li ◽  
Zhen Yin ◽  
Zheng Li
Keyword(s):  
Ultrasonic Vibration ◽  
Laser Scanning ◽  
Design Method ◽  
Internal Grinding ◽  
Theoretical Design ◽  
Contact Transmission ◽  
Grinding System

Based on the FEM, the properties of the vibrator and the shaft in new ultrasonic vibration internal grinding system were studied in this paper. The design method of new ultrasonic vibration internal grinding (UVG) system by using rotary non-contact transmission device was proposed according to the influence of the sleeve length and thickness to ultrasonic vibration shaft. Experiments about the vibrator，the shaft and the ultrasonic vibration internal grinding system were studied by using PSV-400 Laser scanning vibrometer, and the consistency between the new ultrasonic vibration internal grinding prototype and theoretical design was confirmed.

scholarly journals Parallel Control to Fragments of a Cylindrical Structure Driven by Explosive inside

2015 ◽  
Vol 2015 ◽  
pp. 1-13
Author(s):  
Wenkai Chen ◽  
Xiangyu Li ◽  
Fangyun Lu ◽  
Zhenduo Li ◽  
Zhenyu Zhang
Keyword(s):  
Spatial Distribution ◽  
Numerical Model ◽  
Design Method ◽  
Shell Shape ◽  
Curvature Radius ◽  
Simulation Data ◽  
End Effects ◽  
Cylindrical Structure ◽  
Theoretical Design ◽  
Parallel Control

By analyzing the fragmentation distributions of a cylindrical structure and a specific structure, the necessity of parallel control to the fragments is presented. The shell shape of structures has an influence on the fragment spatial distribution. A new design method for the shell shape is proposed. To facilitate the establishment of the numerical model and the machining for relative experiments, the mathematical description of the theoretical calculated generatrix of the shell is simplified. The fragment spraying processes of the designed structures are simulated, and end effects are analyzed. Based on the theoretical design and plentiful simulation data, the relationships between the size of the parallel fragmentation structure and the optimized curvature radius of the shell are expressed by an equation. The equation is validated by numerical means and can be a reliable reference to the design of the parallel fragmentation structure.

Study on Meshing Characteristic and CAM Technology of Limacon Type Gears

2011 ◽  
Vol 201-203 ◽  
pp. 167-170
Author(s):  
Jia Li Zhao ◽  
Peng Fei Meng
Keyword(s):  
Design Method ◽  
Manufacturing Technology ◽  
Shape Design ◽  
Digital Manufacturing ◽  
Transmission Characteristics ◽  
Research Results ◽  
Systemic Theory ◽  
Theoretical Design ◽  
Parameterized Modeling ◽  
Pitch Curve

According to the meshing principle of non-circular gears, the meshing characteristic and digital manufacturing technology of Limacon type gears is studied. Based on analyzing the parameterized modeling of pitch curve, transmission characteristics and convexity-concavity analysis on Limacon type gears, the transmission feasibility of this type gear is proved. Through tooth shape design, CAM calculation and analysis with example, and processing simulation, the validity and manufacturability of theoretical design method on this type gear is proved. The research results can provide more systemic theory basis for the design, manufacture, measure and application of Limacon type gears.

scholarly journals A theoretical design method for the nozzle pitch of air-flotation system to reduce large liquid crystal display glass substrate’s deformation

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Bin Huang ◽  
Teng Fu ◽  
Xiao-bo Xu ◽  
Mei-xian Chen ◽  
Yang Zhou ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Glass Substrate ◽  
Design Method ◽  
Film Theory ◽  
Distribution Model ◽  
Crystal Glass ◽  
Detection Accuracy ◽  
Theoretical Design ◽  
Air Flotation ◽  
Air Film

AbstractThe deformation of large glass substrate in air-flotation system affects detection accuracy of inspection instrument. According to the gas lubrication theory, Timoshenko’s thin film theory and the simulation figure of the pressure distribution of the air film flow field, the air load distribution model of the air film is established, and the deformation expression of the large liquid crystal glass substrate in air-flotation system is given. On this basis, a theoretical design method for designing nozzle pitch of orifice throttling air-flotation system was proposed. Combined with examples, the results of theories and simulation are compared. An experiment on the deformation of the glass substrate was carried out on an experimental prototype. The difference between the experimental results and the theoretical results does not exceed 10%.

Study on Design Method of the Microstructure for Layered and Ring-Shaped Acoustic Cloaking Based on Bimode Metamaterial

2014 ◽  
Vol 684 ◽  
pp. 219-227
Author(s):  
Qian Jin Xiao ◽  
Xiang Dong Zhang ◽  
Jia Chang Qian ◽  
Hong Chen
Keyword(s):  
Theoretical Basis ◽  
Design Method ◽  
Design Methods ◽  
Design Parameters ◽  
Physical Parameters ◽  
Theoretical Design ◽  
Microstructure Model ◽  
Analytic Expression ◽  
Layered Design ◽  
The Relationship

The paper proposes a design method for the layered and ring-shaped acoustic cloaking based on BM. According to the theory of PM cloaking, physical parameters of the ring-shaped acoustic cloaking are given by theoretical design. Further, based on the features of microstructure of BM, the relationship between the parameters of each layer of microstructure of BM and the analytic expression of the physical parameters of acoustic cloaking made of BM is determined, and the design methods for microstructure of layered and ring-shaped acoustic cloaking are discussed, namely, radial equidistant layered design and radial non-equidistant layered design (i.e. equal sectorial angle layered design). At last, according to the radial non-equidistant layered design parameters of the ring-shaped acoustic cloaking, the microstructure model of the layered and ring-shaped acoustic cloaking is designed. The results of the study can serve as theoretical basis for actual production and application of acoustic cloaking.

The Supercavitating Pump

1973 ◽  
Vol 187 (1) ◽  
pp. 649-665 ◽  
Author(s):  
I. S. Pearsall
Keyword(s):  
Design Method ◽  
Suction Side ◽  
Tip Clearance ◽  
Experimental Results ◽  
Theoretical Design ◽  
Blade Thickness ◽  
Aircraft Fuel ◽  
Blade Shape ◽  
Stagger Angle ◽  
Good Agreement

Cavitation in conventional pumps can cause loss of efficiency and erosion damage. For these reasons speeds and suction pressure are limited to avoid these effects. There are, however, applications where, for technical or economic reasons, these limitations are not acceptable. For these, the supercavitating pump has been developed. Basically it comprises an axial-type impeller with cavities forming over the suction side of the blade and collapsing downstream where they cause no damage. For duties requiring higher pressures, it can be staged in front of a conventional centrifugal pump. The complete development of the supercavitating pump, the theoretical optimization of the geometric parameters to get good or best performance and the theoretical design method based on potential flow cascade data are described. Experimental results are given for a series of impellers of different size, speed, stagger angle and blade shape. Comparison of the experimental results with the design method gives good agreement on the whole. Data are also given on the effects of secondary losses, tip clearance losses, blade thickness and blade rake. Some of the applications and uses of such pumps in the process industry, as boiler feed and aircraft fuel pumps and for water jet propulsion, are discussed.

The Supercavitating Pump

1973 ◽  
Vol 187 (1) ◽  
pp. 649-665 ◽  
Author(s):  
I. S. Pearsall
Keyword(s):  
Design Method ◽  
Suction Side ◽  
Tip Clearance ◽  
Experimental Results ◽  
Theoretical Design ◽  
Blade Thickness ◽  
Aircraft Fuel ◽  
Blade Shape ◽  
Stagger Angle ◽  
Good Agreement

Cavitation in conventional pumps can cause loss of efficiency and erosion damage. For these reasons speeds and suction pressure are limited to avoid these effects. There are, however, applications where, for technical or economic reasons, these limitations are not acceptable. For these, the supercavitating pump has been developed. Basically it comprises an axial-type impeller with cavities forming over the suction side of the blade and collapsing downstream where they cause no damage. For duties requiring higher pressures, it can be staged in front of a conventional centrifugal pump. The complete development of the supercavitating pump, the theoretical optimization of the geometric parameters to get good or best performance and the theoretical design method based on potential flow cascade data are described. Experimental results are given for a series of impellers of different size, speed, stagger angle and blade shape. Comparison of the experimental results with the design method gives good agreement on the whole. Data are also given on the effects of secondary losses, tip clearance losses, blade thickness and blade rake. Some of the applications and uses of such pumps in the process industry, as boiler feed and aircraft fuel pumps and for water jet propulsion, are discussed.

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