A practical design method for two-phase thermosyphon loop based on approaching degree to “ideal cycle”

2021 ◽  
Vol 182 ◽  
pp. 116059
Author(s):  
Xiaorui Yang ◽  
Penglei Zhang ◽  
Yue Li ◽  
Dalin Zhang
Keyword(s):  
Design Method ◽  
Two Phase ◽  
Practical Design

scholarly journals A QFD-Based Quality and Capability Design Method for Transboundary Services

2020 ◽  
Vol 2020 ◽  
pp. 1-18 ◽  
Author(s):  
Chao Ma ◽  
Wei Dong Liu ◽  
Zhi Ying Tu ◽  
Zhong Jie Wang ◽  
Xiao Fei Xu
Keyword(s):  
Nonlinear Programming ◽  
Quality Function Deployment ◽  
Design Method ◽  
Quality Parameters ◽  
Optimal Configuration ◽  
Two Phase ◽  
Internet Service ◽  
Fuzzy Nonlinear Programming ◽  
Nonlinear Programming Methods ◽  
Multiple Domains

The “transboundary”, an emerging phenomenon in the Internet service ecosystem, is leading to the flourishing of innovative services. A transboundary service incorporates services, resources, and technologies from multiple domains into its business to create a particular competitive advantage and unique user experiences. It is difficult to comprehensively consider all the constraints from multiple domains to precisely design the nonfunctional characteristics of transboundary services, such as quality attributes and capability attributes. We propose a two-phase quality design method for transboundary services called value quality deployment-quality capability deployment (VQD-QCD) based on quality function deployment (QFD). Given the restrictions of transboundary services, VQD-QCD translates the value expectations of multiple stakeholders into an optimal configuration for global quality parameters (GQPs), local quality parameters, and capability parameters. Details of VQD are illustrated. Considering the inherent vagueness and uncertainty of relationships between value expectations and GQPs, and among GQPs, fuzzy least absolute regression and fuzzy nonlinear programming methods are incorporated into QFD to identify the quantitative relations between value indicators and GQPs, and among GQPs, and obtain an optimal configuration scheme for GQPs. Usability of the proposed method is validated through a case study on the “DiDi mobile transportation service”, which is a representative transboundary service in China. Compared with the current method, which is inaccurate and inefficient because its translation between value expectations and relevant quality and capability parameters is artificial and subjective, the proposed method integrates fuzzy least absolute regression and fuzzy nonlinear programming methods into QFD, which facilitate transboundary service designers to precisely and efficiently design the quality and capability characteristics of innovative services in the manner of semiautomatisation, which promotes the innovative design of transboundary services.

Modeling and Optimizing of Mechanically Agitated Vessels by Central Composite Rotatable Design Method

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Ramin Zadghaffari ◽  
Jafarsadegh Moghaddas ◽  
F. Fakheri ◽  
H. Razmi ◽  
H. Heidari
Keyword(s):  
Gas Flow ◽  
Design Method ◽  
Mixing Time ◽  
Central Composite Rotatable Design ◽  
Two Phase ◽  
Injection Point ◽  
Tracer Injection ◽  
Operating Variables ◽  
Central Composite ◽  
Rotatable Design

A central composite rotatable design (CCRD) methodology was used to analyze the effect of some operating variables on gas-liquid two phase mixing time in an agitated tank driven by dual 6-blade Rushton turbines. The variables chosen were the impellers rotational speed (x1), gas flow rate (x2), probe location (x3) and tracer injection point (x4). The mathematical relationship of mixing time on the four significant independent variables can be approximated by a nonlinear polynomial model. Predicted values were found to be in good agreement with the experimental values (R-sq of 95.9 percent and R-Sq (Adj) of 95.7 percent for response Y). This study has shown that central composite design could efficiently be applied for the modeling of mixing time, and it is an economical way of obtaining the maximum amount of information with the fewest number of experiments.

Design method of a two-phase annular nozzle in cryogenic liquid expander

2019 ◽  
Vol 233 (6) ◽  
pp. 762-772
Author(s):  
Hongyang Li ◽  
Wen Li ◽  
Xuehui Zhang ◽  
Yangli Zhu ◽  
Zhitao Zuo ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Design Method ◽  
Cryogenic Liquid ◽  
Annular Nozzle ◽  
Critical Component ◽  
Two Phase ◽  
Step Process ◽  
Second Stage ◽  
Nonequilibrium Effects ◽  
Good Agreement

The two-phase annular nozzle is a critical component of liquid expanders. It matches the outlet of the first stage and the inlet of the second stage. A design method of two-phase annular nozzle involving a two-step process is proposed. Nonequilibrium effects are introduced by the area factor during the second process. The flashing in two-phase annular nozzle is simulated through the cavitation method and validated by the experimental results of Brookhaven National Laboratory’s nozzle and Hord’s hydrofoil. A forward flashing two-phase annular nozzle and a backward flashing two-phase nozzle are designed with different centerline angle distributions where they show a good agreement with the design. Forward flashing two-phase annular nozzle exhibits high curvature and nonuniformity. Backward flashing two-phase nozzle exhibits lower nonuniformity and a slightly higher boundary layer ratio, which shows a better performance in terms of the nonequilibrium effects.

scholarly journals An inverse mean-line design method for optimizing radial outflow two-phase turbines in geothermal systems

2021 ◽  
Vol 168 ◽  
pp. 463-490
Author(s):  
Hongyang Li ◽  
Sham Rane ◽  
Zhibin Yu ◽  
Guopeng Yu
Keyword(s):  
Design Method ◽  
Geothermal Systems ◽  
Two Phase ◽  
Radial Outflow ◽  
Line Design

Servo System Design Considering Low-Stiffness of Robot

1996 ◽  
Vol 8 (3) ◽  
pp. 252-258 ◽  
Author(s):  
Akira Shimada ◽  
Keyword(s):  
System Design ◽  
Design Method ◽  
Industrial Robot ◽  
Servo System ◽  
The Other ◽  
Special Relation ◽  
Practical Design ◽  
Single Moment ◽  
Industrial Use ◽  
Low Stiffness

This paper describes the practical design method of an advanced servo system for industrial robot manipulators, where it includes a disturbance and velocity observer. It is first assumed that the feature on frequency response of the robot is approximated to the feature of two-mass mechanism. Actually this is confirmed by some experiments. On the other hand, it is insisted that the actual servo system should be simple for industrial use. The observer is designed for the load which has the feature of single moment of inertia. Based on the assumption that there is a difference between these features, it is introduced that the servo system can be effectively used if only the qualified gains are selected considering lowstiffness. The special relation between the frequency analysis and the pole allocations are then shown, and Finally the experimental results are introduced.

Practical design method for an electromagnetic wave absorber at 9.45 GHz

1995 ◽  
Vol 31 (3) ◽  
pp. 2285-2289 ◽  
Author(s):  
Ki-Chul Han ◽  
Wang-Sup Kim ◽  
Kyung-Yong Kim
Keyword(s):  
Electromagnetic Wave ◽  
Design Method ◽  
Practical Design

A Study of Machine Design Method Based on Technological Process

2011 ◽  
Vol 697-698 ◽  
pp. 671-675
Author(s):  
D. Wang ◽  
Yu Hu Yang ◽  
Z. Shi
Keyword(s):  
Real Time ◽  
Technological Process ◽  
Design Process ◽  
Design Method ◽  
Tree Structure ◽  
Machine Design ◽  
Practical Design

This paper proposes a method of building the design tree with stratified constraints and modifications for the machine design with pre-defined technological process. The design method displays the design process in a tree structure with overall open yet local convergent characteristics. It is applied to develop an innovative, a comprehensive, and practical design through design detailing, integrative constraints and interventions, and real-time evaluations. As an example the design of the tire-building drum is given.

A Method of Cultural Creative Product Design Based on Reverse Engineering

2013 ◽  
Vol 365-366 ◽  
pp. 1247-1250
Author(s):  
Lan Yao ◽  
Chao Jiang ◽  
Sui Huai Yu
Keyword(s):  
Reverse Engineering ◽  
Product Design ◽  
Design Method ◽  
Practical Significance ◽  
Design Work ◽  
Design Problems ◽  
Cultural Elements ◽  
The Social ◽  
Practical Design ◽  
Important Design

With the improvement of the social civilization, culture connotations of design problems have become increasingly prominent. And the cultural elements must integrate into design work to get development. Since cultural and creative product design is the re-exhibition of culture, traditional culture spirit connotation and cultural nutrition should be grasped and absorbed. Reverse engineering is a very important design method which is widely used in product design. Based on reverse engineering, a rapid and high quality creative design method over cultural and creative product design is proposed. The practical design application proves that the proposed method is feasible, of practical significance and application value.

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