On the Coupling of Designer Experience and Modularity in the Aerothermal Design of Turbomachinery

2008 ◽  
Author(s):  
Jerome P. Jarrett ◽  
Tiziano Ghisu ◽  
Geoffrey T. Parks
Keyword(s):  
Exchange Rates ◽  
System Design ◽  
Design Process ◽  
System Performance ◽  
Preliminary Design ◽  
Aerodynamic Design ◽  
Potential Cost ◽  
Final Performance ◽  
Design Variables ◽  
Rules Of Thumb

The turbomachinery aerodynamic design process is characterized both by its complexity and the reliance on designer experience for success. Complexity has led to the design being decomposed into modules; the specification of their interfaces is a key outcome of preliminary design and locks-in much of the final performance of the machine. Yet preliminary design is often heavily influenced by previous experience. While modularity makes the design tractable, it complicates the appropriate specification of the module interfaces to maximize whole-system performance: coupling of modularity and designer experience may reduce performance. This paper sets out to examine how such a deficit might occur and to quantify its cost in terms of efficiency. Two disincentives for challenging decomposition decisions are discussed. The first is where tried-and-tested engineering “rules of thumb” accord between modules: the rational engineer will find alluring a situation where each module can be specified in a way that maximizes its efficiency in isolation. The second is where there is discontinuity in modeling fidelity, and hence difficulty in accurately assessing performance exchange rates, between modules. In order to both quantify and reduce the potential cost of this coupling we have recast the design problem in such a way that what were previously module interface constraints become key system design variables. An example application of our method to the design of a generic turbofan core compression system is introduced. It is shown that nearly 1 percentage point equivalent compressor adiabatic efficiency can be saved.

On the Coupling of Designer Experience and Modularity in the Aerothermal Design of Turbomachinery

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Jerome P. Jarrett ◽  
Tiziano Ghisu ◽  
Geoffrey T. Parks
Keyword(s):  
Exchange Rates ◽  
System Design ◽  
Design Process ◽  
System Performance ◽  
Preliminary Design ◽  
Aerodynamic Design ◽  
Potential Cost ◽  
Final Performance ◽  
Design Variables ◽  
Rules Of Thumb

The turbomachinery aerodynamic design process is characterized both by its complexity and the reliance on designer experience for success. Complexity has led to the design being decomposed into modules; the specification of their interfaces is a key outcome of preliminary design and locks-in much of the final performance of the machine. Yet preliminary design is often heavily influenced by previous experience. While modularity makes the design tractable, it complicates the appropriate specification of the module interfaces to maximize whole-system performance: coupling of modularity and designer experience may reduce performance. This paper sets out to examine how such a deficit might occur and to quantify its cost in terms of efficiency. Two disincentives for challenging decomposition decisions are discussed. The first is where tried-and-tested engineering “rules of thumb” accord between modules: the rational engineer will find alluring a situation where each module can be specified in a way that maximizes its efficiency in isolation. The second is where there is discontinuity in modeling fidelity, and hence difficulty in accurately assessing performance exchange rates between modules. In order to both quantify and reduce the potential cost of this coupling, we have recast the design problem in such a way that what were previously module interface constraints become key system design variables. An example application of our method to the design of a generic turbofan core compression system is introduced. It is shown that nearly one percentage point of the equivalent compressor adiabatic efficiency can be saved.

Building an expert system for the preliminary design of ships

1987 ◽  
Vol 1 (3) ◽  
pp. 191-205 ◽  
Author(s):  
Shinsuke Akagi ◽  
Kikuo Fujita
Keyword(s):  
Expert System ◽  
Design Process ◽  
Network Model ◽  
Design Parameters ◽  
Design Knowledge ◽  
Preliminary Design ◽  
Knowledge Representations ◽  
Design Variables ◽  
Effective Diagnosis

An expert system for the preliminary design of ships developed. The design process is understood as determining design variables and the relationships among design parameters. The relationships among the elements of design knowledge are represented by a network model. The object-oriented knowledge representations are introduced in the computer system to manipulate design variables such as the principle particulars of a ship in the network model. The expert system based on the above concept provides the following functions: (1) flexibility for building a model and easy modification of the model; (2) effective diagnosis of the design process by using rule-based knowledge representations; (3) hybrid function with both symbolic treatment of the design knowledge and numerical computations by coupling the systems programmed in LISP and FORTRAN and (4) a supporting method for determination of the design variables.Finally the system's validity and effectiveness is ascertained by applying it to the preliminary design of a bulk carrier ship.

scholarly journals Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis

2021 ◽  
Vol 22 ◽  
pp. 39
Author(s):  
Karim Abu Salem ◽  
Palaia Giuseppe ◽  
Cipolla Vittorio ◽  
Binante Vincenzo ◽  
Zanetti Davide ◽  
...  
Keyword(s):  
Design Process ◽  
Statistical Data ◽  
Aerodynamic Design ◽  
High Lift ◽  
Induced Drag ◽  
Design Variables ◽  
Loading Ratio ◽  
Feasible Space ◽  
Lifting System ◽  
Control Surfaces

A way to face the challenge of moving towards a new greener aviation is to exploit disruptive aircraft architectures; one of the most promising concept is the PrandtlPlane, a box-wing aircraft based on the Prandtl's studies on multiplane lifting systems. A box-wing designed accordingly the Prandtl “best wing system” minimizes the induced drag for given lift and span, and thus it has the potential to reduce fuel consumption and noxious emissions. For disruptive aerodynamic concepts, physic-based aerodynamic design is needed from the very early stages of the design process, because of the lack of available statistical data; this paper describes two different in-house developed aerodynamic design tools for the PrandtlPlane conceptual aerodynamic design: AEROSTATE, for the design of the box-wing lifting system in cruise condition, and THeLMA, aiming to define the layout of control surfaces and high lift devices. These two tools have been extensively used to explore the feasible space for the aerodynamic design of the box-wing architecture, aiming to define preliminary correlations between performance and design variables, and guidelines to properly initialize the design process. As a result, relevant correlations have been identified between the rear-front wing loading ratio and the performance in cruise condition, and for the rear-front flap deflections and the aeromechanic characteristics in low speed condition.

scholarly journals Toward Modeling the Concurrent Design of Aircraft Engine Turbines

1993 ◽  
Author(s):  
Hauhua Lee ◽  
Sanjay Goel ◽  
Siu S. Tong ◽  
Brent Gregory ◽  
Scott Hunter
Keyword(s):  
Design Process ◽  
Mechanical Design ◽  
Aircraft Engine ◽  
Design System ◽  
Concurrent Design ◽  
Preliminary Design ◽  
Design Practice ◽  
Aerodynamic Design ◽  
Computer Aided ◽  
Four Levels

This paper describes our approach and experiences in constructing the Turbine Auto–Designer (TAD), an automated concurrent design system for aircraft engine turbines. In TAD, the design process is modeled based on the computer programs of a representative design system. It integrates three domains of the manual design process: preliminary design, detailed aerodynamic design, and detailed mechanical design. The manual design of turbines is an iterative redesign process involving the use of many sets of Computer Aided–Engineering (CAE) programs. The entire design process is modeled at four levels: analysis, automation, optimization, and concurrency. TAD is implemented with Engineous, a generic software shell for engineering design. Parts of TAD are already in use in day–to–day design practice for low–pressure turbines. In many cases of preliminary design, TAD can obtain better results quicker than the optimum obtained manually. Results also show that, for detailed aerodynamic analysis, the system can reduce the cycle time from days to hours.

Cyberphysical Design Automation Framework for Knowledge-based Engineering

2013 ◽  
Vol 1 (1) ◽  
pp. 158-178
Author(s):  
Urcun John Tanik
Keyword(s):  
System Design ◽  
Design Process ◽  
Design Automation ◽  
Design Theory ◽  
Knowledge Bases ◽  
Knowledge Based ◽  
Knowledge Based Engineering ◽  
Cyberphysical System ◽  
Automation Framework

Cyberphysical system design automation utilizing knowledge based engineering techniques with globally networked knowledge bases can tremendously improve the design process for emerging systems. Our goal is to develop a comprehensive architectural framework to improve the design process for cyberphysical systems (CPS) and implement a case study with Axiomatic Design Solutions Inc. to develop next generation toolsets utilizing knowledge-based engineering (KBE) systems adapted to multiple domains in the field of CPS design automation. The Cyberphysical System Design Automation Framework (CPSDAF) will be based on advances in CPS design theory based on current research and knowledge collected from global sources automatically via Semantic Web Services. A case study utilizing STEM students is discussed.

Contemporary Methods of Designing Rail Vehicle Running Systems with the Use of CAD and CAM Solutions

2020 ◽  
Vol 64 (187) ◽  
pp. 75-80
Author(s):  
Tomasz Antkowiak ◽  
Marcin Kruś
Keyword(s):  
System Design ◽  
Preliminary Design ◽  
Support Design ◽  
Detailed Design ◽  
Final Shape ◽  
Rail Vehicle ◽  
Design Engineers ◽  
Running System ◽  
Cad Cam

The article discusses the process of designing the running system of a rail vehicle using CAD and CAM tools as the solutions supporting the process. It describes the particular stages of design taking its final shape: from a preliminary design, through a detailed design, ending with the stage of production. Each stage includes a presentation of how CAD and CAM tools are used to support design engineers in their practice. Keywords: running system, design, CAD, CAM

A FRAMEWORK FOR THE SYSTEM DESIGN PROCESS

1972 ◽  
Vol 3 (1) ◽  
pp. 83-109 ◽  
Author(s):  
CHRISTOPHER E. NUGENT ◽  
THOMAS E. VOLLMANN
Keyword(s):  
System Design ◽  
Design Process

scholarly journals Example of Warehouse System Design Based on the Principle of Logistics

2021 ◽  
Vol 13 (8) ◽  
pp. 4492
Author(s):  
Janka Saderova ◽  
Andrea Rosova ◽  
Marian Sofranko ◽  
Peter Kacmary
Keyword(s):  
System Design ◽  
Design Process ◽  
System Analysis ◽  
Proper Function ◽  
Logistics Systems ◽  
Starting Point ◽  
Storage Area ◽  
Area Percentage ◽  
First In First Out ◽  
Percentage Ratio

The warehouse process, as one of many logistics processes, currently holds an irreplaceable position in logistics systems in companies and in the supply chain. The proper function of warehouse operations depends on, among other things, the type of the used technology and their utilization. The research in this article is focused on the design of a warehouse system. The selection of a suitable warehouse system is a current research topic as the warehouse system has an impact on warehouse capacity and utilization and on the speed of storage activities. The paper presents warehouse system design methodology that was designed applying the logistics principle-systematic (system) approach. The starting point for designing a warehouse system represents of the process of design logistics systems. The design process consists of several phases: project identification, design process paradigm selection, system analysis, synthesis, and project evaluation. This article’s contribution is the proposed methodology and design of the warehouse system for the specified conditions. The methodology was implemented for the design of a warehouse system in a cold box, which is a part of a distribution warehouse. The technology of pallet racking was chosen in the warehouse to store pallets. Pallets will be stored and removed by forklifts. For the specified conditions, the warehouse system was designed for two alternatives of racking assemblies, which are served by forklifts. Alternative 1—Standard pallet rack with wide aisles and Alternative 2—Pallet dynamic flow rack. The proposed systems were compared on the basis of selected indicators: Capacity—the number of pallet places in the system, Percentage ratio of storage area from the box area, Percentage ratio of handling aisles from the box area, Access to individual pallets by forklift, Investment costs for 1 pallet space in EUR. Based on the multicriteria evaluation, the Alternative 2 was chosen as the acceptable design of the warehouse system with storage capacity 720 pallet units. The system needs only two handling aisles. Loading and unloading processes are separate from each other, which means that there are no collisions with forklifts. The pallets with the goods are operated on the principle of FIFO (first in, first out), which will facilitate the control of the shelf life of batches or series of products. The methodology is a suitable tool for decision-making in selecting and designing a warehouse system.

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