1,721,081 research outputs found
Application of Fuzzy logic in design phase of car-platform for an electrical rear-wheel drive vehicle
No full textA study on the influence of mass distribution on thin walled beam for vehicle use (made by tailored-welded-blanks) in crash performance at high and medium velocity
No full textOptimization and solution approximation of design problems formulated by axiomatic design and paracomplete logic
No full textOf primary importance in Axiomatic Design (AD) theory is Suh‘s first axiom, stating that the independence of functional requirements should be maintained throughout the design process. Para-complete logics, such as fuzzy logic, can be used to express the relationship between functional requirements (FRs) and design parameters (DPs) in AD. This is especially true in cases where this relationship can only be codified using linguistic variables. In fact, para-complete logics violate the principle of the excluded third party, allowing for the effects of changes in DP within the same FR to be considered partially independent of each other. Recently, a paper was published investigating changes in the concept of decoupled design when para-complete logics are applied to FRs-DPs link definition. Using an example case, this paper evaluated the impact of a designer‘s decoupling capability using composition rules for FRs, in order to make the design matrix diagonal or lower triangular by decoupling the effects of several DPs on different FRs using fuzzy formulation. -cut is a powerful instrument used to modify membership functions in order to approximate a non- optimized solution to an optimized one, by simply modifying the membership values. In this paper, we attempt to elaborate a simple optimization method based on a controlled approximation given by several values applied to different membership functions. We then introduce a new method to control and evaluate the amount of that approximation
Virtual Comfort Evaluation as a New Paradigm of Health and Safety in Industrial Engineering
No full textA New Method for Measuring Solution Approximation using α-cut in Industrial Design Problems formulated by Axiomatic Framework and Para-Complete Logic
No full textAxiomatic design of a concept of car-platform for an electrical rear-wheel drive vehicle: a comparison with a fuzzy approach
No full textAXIOMATIC FRAMEWORK APPLIED TO INDUSTRIAL DESIGN PROBLEM FORMULATED BY PARA-COMPLETE LOGICS APPROACH: THE POWER OF DECOUPLING ON OPTIMIZATION-PROBLEM SOLVING
Full text linkA primary “must” of axiomatic design theory is the first axiom, stating that independence of
functional requirements should be maintained throughout the design process.
Para-complete logics, such as Fuzzy logic, give us a powerful instrument to express
“mathematical/functional” interaction between FRs and DPs, especially when this interaction
cannot be expressed by a precise “mathematical function (i.e. the case in which we want to express
several data from VOC (Voice of Customer) investigation, building an FR for a defined design
performance), and so can be codified only using “Linguistic variables”.
Para-complete logics, among which the Fuzzy logic is, for us, the most powerful, violate the
principle of the excluded third party, so that the effects of DPs’ changes on the same FR can be
considered partially independent each other.
Recent paper investigated changes in Decoupled Design’s concept when para-complete logics are
applied in FRs-DPs link definition and evaluated, using an example, the impact of decoupling
capability of designer using composition rules on FRs, in order to make the design matrix diagonal
or lower triangular by decoupling effects of several DPs on different FRs using Fuzzy formulation.
In this paper that kind of approach is extended to optimization method; in this paper we want
demonstrate how is possible, using Fuzzy formulation and respecting the first Suh’s Axiom, to
elaborate a simple optimization routine based on variation and bounding of DPs values in given
ranges.
Using that method, Defuzzyfication of DPs for Design optimization will became very simple. A
new practical application will be explained
Axiomatic Design of a car bonnet: a new decoupling method based on Fuzzy Logic application
No full textIn Axiomatic Design Approach, the first axiom, states that independence of functional requirements should be maintained throughout the design process. Para-complete logics, such as Fuzzy logic, represents a powerful instrument to express “mathematical/functional” interaction between Functional Requirements (FRs) and Design Parameters (DPs). Para-complete logics violate the principle of the excluded third party, so that the effects of DPs’ changes on the same FR can be considered partially independent each other. Our paper investigates the changes in Decoupled Design’s concept when para-complete logics are applied in FRs-DPs matrix definition. Paper evaluates the impact of decoupling capability of designer using composition rules on FRs, in order to make the design matrix diagonal or lower triangular by decoupling effects of several DPs on different FRs using Fuzzy formulatio
New Child/Adult Head impactor modelling for Pedestrian Test simulation, according to EEVC WG17 protocol - rel. 2002, using FEM explicit codes
No full textAdditive manufacturing for industrial benchmarking: An application to vehicle's under-hood design
No full textAll over the world, and mainly in United States, since 1977 to 1991 the research centers of automotive companies have processed several statistical data on real accidents between vehicles and pedestrians taking care, obviously, to pedestrians' injury. In latest years, a research group of EEVC (European Enhanced Vehicle-Safety Committee) had realized some documents about "pedestrian test" procedures. In reference papers of period 1977 - 1997 and in EEVC documents, the scientists describe a proposed homologating test for child-head impact; it is represented by the impact of some standardized impactors on car bonnet, in order to evaluate the child-head injury as deceleration of its gravity center. Injury evaluation criteria is an energy criterion and is quantified by the HPC index (see below) calculated by acceleration resultant vector, measured by an accelerometer mounted in the head- impactor. Our research wants to propose a new potential-injury evaluation method based on virtual reconstruction of the surface that envelope all the deformation surfaces in internal part of the bonnet and on its rapid prototyping. This surface is so processed and rapid prototyped as a puzzle of shells with their support. This prototyped surface is super-imposed on the real under-bonnet layout of a car and allows to evaluate easily where and how much our deformed bonnet could hit the hard-parts of the engine layout. This paper shows the results of this research project
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