Efficiency-Driven Design Methodology of Gerotor Hydraulic Units

2019 ◽  
Vol 142 (6) ◽  
Author(s):  
Federico Tessari ◽  
Renato Galluzzi ◽  
Nicola Amati
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Aspect Ratio ◽  
Design Methodology ◽  
High Efficiency ◽  
Design Method ◽  
Hydraulic Devices ◽  
Dynamics Models ◽  
Internal Gear

Abstract Gerotor machines are internal gear hydraulic devices that present numerous performance benefits with respect to other topologies. For this reason, they find their application in high-efficiency mechatronic devices, such as electro-hydrostatic actuators. When designing gerotor machines either as a motor or pump, there are numerous parameters to choose, with different influences on the mechanical and volumetric efficiency behavior. Some of these aspects have been addressed in previous research works, while other important features like the tooth aspect ratio have been partially or completely neglected. Hence, it is the goal of this paper to present a methodology, as linear and generic as possible, to tackle the design of gerotor units. The proposed design method is numerically validated through a case study, where dedicated computational fluid dynamics models are used to assess the performance of the prototype.

Conceptual design methodology of a box wing aircraft: A novel commercial airliner

2018 ◽  
Vol 232 (14) ◽  
pp. 2651-2662 ◽  
Author(s):  
Pavlos Kaparos ◽  
Charalampos Papadopoulos ◽  
Kyros Yakinthos
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Aspect Ratio ◽  
Conceptual Design ◽  
Design Methodology ◽  
Aerodynamic Performance ◽  
Design Parameters ◽  
Sweep Angle ◽  
Continuous Surface ◽  
Wing Tips

In this work, the development of a conceptual design methodology of an innovative aircraft configuration, known as box wing, is presented. A box wing aircraft is based on a continuous-surface nonplanar wing formation with no wing-tips. The A320 medium range conventional cantilever wing aircraft is used as both the reference aircraft and the main competitor of the box wing aircraft. Based on the A320 characteristics and dimensions, a complete aerodynamic analysis of the box wing configuration is made by means of layout design and computational fluid dynamics studies, highlighting the aerodynamic and operating advantages of the box wing configuration compared to the A320 aircraft. The aspect ratio and the Oswald factor of a box wing aircraft differ significantly from the corresponding ones of A320 and provide increased aerodynamic performance. The increased aerodynamic performance leads by consequence, to lower fuel consumption, thus allowing longer range for the same payload or greater payload for the same range, contributing to the efforts for greener environment. In this work, the design methodology begins by estimating the critical initial design parameters, such as aspect ratio, dihedral angle, sweep angle, and taper ratio, which are continuously refined via an iterative process based on a conceptual design study. Various flying scenarios are studied using computational fluid dynamics and analytical calculations, in order to compare the performance of the box wing and the conventional A320, having always the same mission and payload conditions. The conceptual results show that the novel box wing configuration has considerable aerodynamic performance advantages compared to the conventional A320 aircraft.

A Study on the Performance of Stratified Air Conditioning Design in Assembly Halls – A Case Study at the Dazhi Cultural Center in Taiwan

2013 ◽  
Vol 368-370 ◽  
pp. 599-602 ◽  
Author(s):  
Ian Hung ◽  
Hsien Te Lin ◽  
Yu Chung Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Indoor Temperature ◽  
Cultural Center ◽  
Computational Fluid Dynamics Cfd

This study focuses on the performance of air conditioning design at the Dazhi Cultural Center and uses a computational fluid dynamics (CFD) simulation to discuss the differences in wind velocity and ambient indoor temperature between all-zone air conditioning design and stratified air conditioning design. The results have strong implications for air conditioning design and can improve the indoor air quality of assembly halls.

scholarly journals Designing in Architecture: Behavioral Approach Methodology

2018 ◽  
Vol 7 (3.27) ◽  
pp. 142
Author(s):  
Sri Astuti Indriyati ◽  
. .
Keyword(s):  
Human Behavior ◽  
Architectural Design ◽  
Design Methodology ◽  
Design Method ◽  
Coping Behavior ◽  
Behavioral Approach ◽  
Employee Productivity ◽  
Specific Design ◽  
New Guidelines

A fundamental premise on environmental and behavioral fields involves assumptions about the systematic interrelationships between architecture and patterns of human behavior. The case study conducted was to confirm the needs of specific design methodology in relations to the area of Perception and Human Behavior. The research focused to the extent to which Office Space Performance gives impact on Employee Productivity and Satisfaction. Following that, It was also seen how those affect the behavior of coping. The findings show that there is a significant impact of Spaces’ Performances on Space Satisfaction. Further, there is a significant impact of Space Satisfaction on Coping Behavior and also a significant impact of Spaces’ Performances against Coping behavior. Humanist architecture with architectural behavior approach is required as a Concept of Planning and Architectural Design in the Future. A New Guidelines for Planning and Architectural Design Method for Architectural Design with Behavior concerns is proposed.   

scholarly journals A cookbook method for Persuasive Game Design

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Panote Siriaraya ◽  
Valentijn Visch ◽  
Arnold Vermeeren ◽  
Michaël Bas
Keyword(s):  
Game Design ◽  
Design Methodology ◽  
Design Method ◽  
Specific Context ◽  
Persuasive Games ◽  
Persuasive Game ◽  
Research Domain ◽  
Practical Constraints ◽  
Complete Process

Despite the growing interest in persuasive game design, there have been few methods which cover the complete process of game design that designers could draw upon in their practice. In this paper, the Persuasive Game Design method(PGD) is presented as a non-directive approach for designing persuasive games including a practical hand-out. To better fit with the practical constraints encountered in game design, this method adopts a “cookbook” approach. A set of essential PGD components and tools are provided from which game designers can choose from, given their specific context and resources. Designers first consider the game design steps(“dishes”) to use in creating their game and in each step, select which components(“ingredients”) to take into account and tools(“utensils”) to use. The proposed method, based on our experience as persuasive game researchers and design practitioners, is further refined using feedback from professional game designers. The paper concludes with a case study illustrating how to put the meal into practice. Overall, the method provides a useful contribution to the existing research domain by combining knowledge from game theory, game design and design methodology to create a structured yet flexible approach which covers the complete persuasive game design process for researchers, students and practitioners. 

scholarly journals A Rapid and Computationally Inexpensive Method to Virtually Implant Current and Next-Generation Stents into Subject-Specific Computational Fluid Dynamics Models

2011 ◽  
Vol 39 (5) ◽  
pp. 1423-1437 ◽  
Author(s):  
Timothy J. Gundert ◽  
Shawn C. Shadden ◽  
Andrew R. Williams ◽  
Bon-Kwon Koo ◽  
Jeffrey A. Feinstein ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Next Generation ◽  
Inexpensive Method ◽  
Subject Specific ◽  
Dynamics Models

Performance improvement of an axial-flow pump with inlet guide vanes in the turbine mode

2019 ◽  
Vol 234 (3) ◽  
pp. 323-331
Author(s):  
Zilong Zhao ◽  
Zhiwei Guo ◽  
Zhongdong Qian ◽  
Qian Cheng
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
High Efficiency ◽  
Design Flow ◽  
Inlet Guide Vane ◽  
Flow Rates ◽  
Guide Vanes ◽  
Inlet Guide Vanes ◽  
Axial Pump ◽  
Turbine Mode

The axial pump operating in the pump-as-turbine mode is a practical and cost-saving alternative suitable for low-head pico hydropower in rural and remote areas that bypasses the need for expensive turbines. Their pump characteristics, however, indicate that efficiency is low in off-design flow rates. Using the computational fluid dynamics, the adjustable inlet guide vanes with five angles (±20°, 0°, ±10°) in front of the impeller of the axial pump have been redesigned and installed specifically to increase the operating range of high efficiency in the pump-as-turbine mode. To validate the simulation method, a prototype of the axial pump was built to measure in the pump mode the pump characteristics including head and efficiency. The results obtained show that the computational fluid dynamics calculated results are in qualitative agreement with the experimental data. In the pump-as-turbine mode, the adjustable inlet guide vanes were found to affect the performance of the axial pump. The most important aspect is that the adjustable inlet guide vanes widen the efficiency range if the inlet guide vane angle is adjusted for different flow rates. For the same situation with negative angles, the efficiency values at the BEP are higher than those with positive angles, where the efficiency around the angle − 10° is the highest. The main reason is that the direction of flow at the impeller-zone exit is guided by the adjustable inlet guide vanes to reduce the energy loss, which can be supported in the view of vector field and energy losses of different parts of pump.

Sign in / Sign up

Export Citation Format

Share Document