Conceptual Design of Mechanical System for Recovery of Seabed-Deposited Hazardous and Noxious Substances Based on Performance Requirements

2020 ◽  
Vol 26 (6) ◽  
pp. 689-697
Author(s):  
Ho-Jin Hwang ◽  
Keyword(s):  
Mechanical System ◽  
Conceptual Design ◽  
Performance Requirements ◽  
Noxious Substances

Innovative Multiple Matching Charts approach to support the conceptual design of hypersonic vehicles

2020 ◽  
Vol 234 (12) ◽  
pp. 1893-1912
Author(s):  
Davide Ferretto ◽  
Roberta Fusaro ◽  
Nicole Viola
Keyword(s):  
Conceptual Design ◽  
High Speed ◽  
Graphical Representation ◽  
Weight Ratio ◽  
Transportation Systems ◽  
Flight Vehicles ◽  
Performance Requirements ◽  
Reference Vehicle ◽  
Vehicle Configuration ◽  
Definition Of

Several well-established best practices and reliable tools have been developed along the years to support aircraft conceptual and preliminary design. In this context, one of the most widely used tool is the Matching Chart (MC), a graphical representation of the different performance requirements (curves representing the thrust-to-weight ratio (T/W) requirement as function of the wing loading (W/S)) for each mission phase. The exploitation of this tool allows the identification of a feasible design space as well as the definition of a reference vehicle configuration in terms of maximum thrust, maximum take-off weight, and wing surface since the very beginning of the design process. Although the tool was originally developed for conventional aircraft, several extensions and updates of the mathematical models have been proposed over the years to widen its application to innovative configurations. Following this trend, this paper presents a further evolution of the MC model to support the conceptual design of high-speed transportation systems, encompassing supersonic and hypersonic flight vehicles. At this purpose, this paper reports and discusses the updates of the methodology laying behind the generation of the MC for high-speed transportation. Eventually, the results of the validation of the updated methodology and tool are reported, using as case study, the STRATOFLY MR3 vehicle configuration, a Mach 8 antipodal civil transportation system, currently under development within the H2020 STRATOFLY project.

Dynamic System Synthesis With a Bond Graph Approach: Part II—Conceptual Design of an Inertial Velocity Indicator

1993 ◽  
Vol 115 (3) ◽  
pp. 364-369 ◽  
Author(s):  
R. C. Redfield
Keyword(s):  
Conceptual Design ◽  
Vibration Isolation ◽  
Synthesis Method ◽  
Design Procedure ◽  
Systems Design ◽  
Design Problems ◽  
Performance Requirements ◽  
Output Performance ◽  
Response Performance ◽  
Dissipation Elements

This work develops the conceptual design of an inertial velocity sensor drawing upon the impedance synthesis method in Part I of this paper. Specifications are frequency based impedances and resulting designs are configurations of dynamic energy storing and dissipation elements. The design procedure can be extended to a class of systems design problems where frequency response performance is of primary importance. A key to this work is that the method designs systems from scratch; initial configurations are unknown. As a theme example to demonstrate the utility of the method for conceptual design, constrained and unconstrained inertial velocity sensors are configured based on input-output performance requirements. Such sensors find application in many motion control problems including mechanism and manipulator control, and vibration isolation control. The design methodology generates a number of different sensors that can measure absolute velocity for some or all ranges of frequency.

QUINT: A Problem-Solving Strategy for Mechanical System Conceptual Design: Part I — Environment, Function, Structure, and Parameter

1990 ◽  
Author(s):  
Wang Qun ◽  
Yang Haibin ◽  
Zhou Ji ◽  
Yu Jun
Keyword(s):  
Expert System ◽  
Problem Solving ◽  
System Design ◽  
Mechanical System ◽  
Conceptual Design ◽  
General Scheme ◽  
Scheme Design ◽  
Design Expert ◽  
Problem Solving Strategy ◽  
Solving Strategy

Abstract Mechanical system conceptual design, sometimes termed mechanical system scheme design or preliminary mechanical system design, is the key link of mechanical system design, and also the bottleneck of integrated CAD / CAM [1][2][3]. Therefore, it is important to automize this part of work to promote the quality of mechanical system design and the extent of product design automation. This paper will discuss in detail a problem-solving strategy for mechanical system conceptual design — QUINT. It devides the conceptual design into five stages: (1) environment ▸ function; (2) function ▸ structure; (3) structure ▸ parameters; (4) parameters ▸ analysis; (5) analysis ▸ evaluation and decision. QUINT has already been successfully applied in CDESTOOL (Conceptual Design Expert System TOOL). With this tool, three practical systems have been developed: industrial turbine general scheme design expert system (TDES), wheel loader general scheme design expert system (WLDES), and milling-boring machining center scheme design expert system (MDES). The result is fairly satisfactory.

scholarly journals Cargo Aircraft Conceptual Design Optimisation Using a Flexible Computer-Based Scaling Approach

10.14311/272 ◽  
2001 ◽  
Vol 41 (4-5) ◽  
Author(s):  
F. Schieck ◽  
D. Schmitt
Keyword(s):  
Conceptual Design ◽  
Figure Of Merit ◽  
Model Performance ◽  
Aircraft Model ◽  
Performance Requirements ◽  
Sufficient Detail ◽  
Requirement Model ◽  
Computer Based ◽  
Early Design Stages ◽  
Aircraft Conceptual Design

In the early design stages of a new aircraft, there is a strong need to broaden the knowledge base of the evolving aircraft project, allowing a profound analysis of the solution concepts and of the design driving requirements. The methodology presented in this paper provides a tool for increasing and improving in an exemplary manner the necessary information on cargo aircraft. By exchanging or adapting a few particular modules of the entire program system, the tool is applicable to a range scale of different aircraft types. In an extended requirement model, performance requirements are represented along with other operational requirements. An aircraft model is introduced in sufficient detail for conceptual design considerations. The computer-aided scaling methodology is explained, which, controlled by an optimisation module, automatically resizes the aircraft model until it optimally satisfies the requirements in terms of a selectable figure of merit. Typical results obtained at the end of the scaling are discussed together with knowledge gained during the process, and an example is given.

QUINT: A Problem-Solving Strategy for Mechanical System Conceptual Design: Part II — Analysis, Evaluation, and Example

1990 ◽  
Author(s):  
Wang Qun ◽  
Yang Haibin ◽  
Zhou Ji ◽  
Yu Jun
Keyword(s):  
Problem Solving ◽  
Mechanical System ◽  
Conceptual Design ◽  
Main Idea ◽  
Second Stage ◽  
Third Stage ◽  
Problem Solving Strategy ◽  
Two Stages ◽  
Solving Strategy

Abstract In part I, the characteristics of mechanical system conceptual design, the main idea of of QUINT and how to realize the first-stage, second-stage and third-stage reasoning were discussed. The part II will continue to study the last two stages of QUINT strategy, and give an example.

Automatic Virtual Entity Simulation of the Symbolic Schemes Generated in Conceptual Design Processes

2009 ◽  
Author(s):  
Yu-Xin Wang ◽  
Yu-Tong Li
Keyword(s):  
Mechanical System ◽  
Conceptual Design ◽  
Lead Time ◽  
Unit Cost ◽  
Competitive Advantages ◽  
Object Based ◽  
Feature Based ◽  
Space Layout ◽  
Set Up ◽  
The Cost

The developing new products of high quality, low unit cost, and shortening lead time to markets are the key elements required for enterprises to obtain competitive advantages. In order to improve the creativity and shorten lead time to markets, a methodology of automatic virtual entity simulation of conceptual design results is proposed. At the end of conceptual design, the conceptual design results are expressed in the symbolic schemes generated by the computerized approach with a higher capability to obtain the innovative conceptual design. Then, the symbolic scheme is identified into basic mechanisms and their connections. To the identified basic mechanisms, their kinematic analysis is carried out by matching basic Barranov trusses, and their virtual entities are modeled based on feature-based technique and encapsulated as one design object. Based on the structures of the basic mechanisms and their connections, a space layout to the mechanical system corresponding to the symbolic scheme is fulfilled then. With the pre-assembly approach, all parts in the mechanical system are put onto proper positions where the constraint equations are met. In this way, the virtual entity assembly model of the mechanical system corresponding to the symbolic scheme is set up. Changing the positions of the driving links continually, the virtual entity simulation of the mechanical system will be fulfilled. As a result, with the aid of this approach, we can not only obtain innovative conceptual design results with excellent performances, but also shorten the design time and the cost of product developments.

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