RESEARCH ON CONCEPTUAL DESIGN OF COMPLEX MECHANICAL PRODUCT BASED ON FUNCTIONAL REASONING MECHANISM

2003 ◽  
Vol 39 (04) ◽  
pp. 19 ◽  
Author(s):  
Guoquan Zhang
Keyword(s):  
Conceptual Design ◽  
Functional Reasoning ◽  
Reasoning Mechanism

A Mathematical Functional Decomposition Approach Through Granularity Partition Process in Quotient Space

2018 ◽  
Author(s):  
Y. T. Li ◽  
Y. X. Wang
Keyword(s):  
Conceptual Design ◽  
Quotient Space ◽  
Lower Layer ◽  
Solution Space ◽  
Decomposition Process ◽  
Decomposition Approach ◽  
Functional Decomposition ◽  
Topological Structures ◽  
Functional Reasoning ◽  
Partition Process

Over the past decades, several methodologies have coalesced around the functional decomposition and partial solution manipulation techniques. These methodologies take designers through steps that help decompose a design problem and build conceptual solutions based on the intended, product functionality. However, this kind of subjective decomposition restricts solutions of conceptual design within designers’ intended the local, rather the whole, solution space. In such cases, the ability for AI-based functional reasoning systems to obtain creative conceptual design solutions is weakened. In this paper, a functional decomposition model based on the domain decomposition theory in quotient space is proposed for carrying out functional decomposition without needing functional reasoning knowledge to support. In this model, the functional decomposition is treated as a granularity partition process in quotient space composed of three variables: the domain granularities, the attribute properties, and the topological structures. The closeness degrees and the attribute properties in fuzzy mathematics are utilized to describe the fuzzy equivalence relations between the granularities in the up-layer and in the lower-layer of the functional hierarchies. According to the order characteristics in the partially sequential quotient space, based on the homomorphism principle, the attribute properties and the topological structures corresponding to the lower-layer of the functional hierarchies are constructed then. Here, the attribute properties are expressed with membership functions pointed to the lower-layer from the up-layer of the functional hierarchies, and the topological structures are expressed with matrixes and the directed function network represent the topological connections among the subfunctions in the lower-layer of the functional hierarchies. Through refining the functional decomposition process step by step, and traversing all tree branches and leaf nodes in the functional decomposition tree, the functional hierarchies are obtained. Since the functional decomposition process not need the user to indicate or manage desired functionality, the model presented in this paper can reduce designers’ prejudices or preconceptions on the functional hierarchies, as well as extend the solution space of conceptual design.

Research on Effect Chain Model with Prolog

2011 ◽  
Vol 421 ◽  
pp. 578-581
Author(s):  
Huan Huan Su ◽  
Chang Qing Gao ◽  
Bo Yang ◽  
Bing Lv
Keyword(s):  
Life Cycle ◽  
Expert System ◽  
Problem Solving ◽  
Conceptual Design ◽  
Expert Knowledge ◽  
Design Stage ◽  
Chain Model ◽  
Innovative Design ◽  
Problem Solving Process ◽  
Reasoning Mechanism

Conceptual design is the most innovative stages in the life cycle of product development, and effect is the solving tools of TRIZ based on knowledge. The use of effects to solve the problem of conceptual design stage can improve the efficiency of Innovative design and competitiveness of enterprises. The problem-solving process of effects applied was described in this paper. In PROLOG environment, the knowledge representation was used to write the effect as expert knowledge base, and then the reasoning mechanism was used to make a simple expert system of effect. It also can be used to help designers check and resolve the design issues more conveniently.

A scheme for functional reasoning in conceptual design

2001 ◽  
Vol 22 (6) ◽  
pp. 493-517 ◽  
Author(s):  
Amaresh Chakrabarti ◽  
Thomas P Bligh
Keyword(s):  
Conceptual Design ◽  
Functional Reasoning

Improved Freeman-Newell Functional Reasoning Model for Conceptual Design of Manufacturing Process Control Strategies

2010 ◽  
Vol 102-104 ◽  
pp. 422-426
Author(s):  
Ge Qun Liu
Keyword(s):  
Process Control ◽  
Conceptual Design ◽  
Manufacturing Process ◽  
Control Strategies ◽  
Algorithm Design ◽  
Manufacturing Process Control ◽  
Functional Reasoning ◽  
Multi Level ◽  
Improved Model ◽  
Design Reasoning

An improved Freeman-Newell functional reasoning model is proposed for the conceptual design of manufacturing process control strategies. The structure in Freeman-Newell model is partitioned into determined subset and undetermined subset. Main framework of the structure is expressed by determined subset. Undetermined subset is presented to express the functions required from next design level. In this way variant design and multi level design reasoning can be supported. Based on the improved Freeman-Newell model, multi level conceptual design methodology for control strategies of manufacturing process is presented. Tracking control algorithm design for a nonlinear manufacturing process plant is provided as the example to verify the design reasoning ability of the improved model.

Innovative Conceptual Design

2001 ◽  
Author(s):  
Ehud Kroll ◽  
Sridhar S. Condoor ◽  
David G. Jansson
Keyword(s):  
Conceptual Design

ANALYSIS OF COMPETING VARIANTS OF AIR CONDITIONING SYSTEMS WITHOUT AIR EXTRACTION FROM ENGINES AT THE STAGE OF PASSENGER AIRCRAFT ONBOARD SYSTEMS CONCEPTUAL DESIGN

2019 ◽  
Vol 6 (3) ◽  
pp. 80-85
Author(s):  
Denis Igorevich Smagin ◽  
Konstantin Igorevich Starostin ◽  
Roman Sergeevich Savelyev ◽  
Anatoly Anatolyevich Satin ◽  
Anastasiya Romanovna Neveshkina ◽  
...  
Keyword(s):  
Conceptual Design ◽  
Air Conditioning ◽  
Research University ◽  
Cooling System ◽  
Fuel Efficiency ◽  
Air Cooling ◽  
Moscow Aviation Institute ◽  
Air Conditioning System ◽  
Low Efficiency ◽  
Air Conditioning Systems

One of the ways to achieve safety and comfort is to improve on-board air conditioning systems.The use of air cooling machine determines the air pressure high level at the point of selection from the aircraft engine compressor. Because of the aircraft operation in different modes and especially in the modes of small gas engines, deliberately high stages of selection have to be used for ensuring proper operation of the refrigeration machine in the modes of the aircraft small gas engines. Into force of this, most modes of aircraft operation have to throttle the pressure of the selected stage of selection, which, together with the low efficiency of the air cycle cooling system, makes the currently used air conditioning systems energy inefficient.A key feature of the architecture without air extraction from the main engines compressors is the use of electric drive compressors as a source of compressed air.A comparative analysis of competing variants of on-board air conditioning system without air extraction from engines for longrange aircraft projects was performed at the Moscow Aviation Institute (National Research University).The article deals with the main approaches to the decision-making process on the appearance of a promising aircraft on-board air conditioning system at the stage of its conceptual design and formulated the basic requirements for the structure of a complex criterion at different life cycle stages.The level of technical and technological risk, together with a larger installation weight, will require significant costs for development, testing, debugging and subsequent implementation, but at the same time on-board air conditioning system scheme without air extraction from the engines will achieve a significant increase in fuel efficiency at the level of the entire aircraft.

Conceptual Design of Geophysical Microsatellite

2014 ◽  
Vol 10 (6) ◽  
pp. 5-15
Author(s):  
S.A. Matviyenko ◽  
Keyword(s):  
Conceptual Design
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