ME Seminar 18. jaanuar 2006 Lembit Roosimölder Aksioomidest lähtuv projekteerimine Axiomatic Design

ME Seminar 18. jaanuar 2006 Aksioomidel põhinev konstrueerimine (MIT)

ME Seminar 18. jaanuar 2006 General Axiomatic Design Concepts Understand their customers' needs Define the problem they must solve to satisfy these needs Create and select a solution Analyze and optimize the proposed solution Check the resulting design against the customers' needs

ME Seminar 18. jaanuar 2006 Axiomatic Design Axiomatic Design recognizes four domains : (valdkonda) The needs of the customer are identified in customer domain and are stated in the form of required functionality of a product in functional domain. (Funktsionaalsuse valdkond) Design parameters that satisfy the functional requirements are defined in physical domain(reaalse konstr valdkond), and, in process domain (tootmine/valmistamise). Manufacturing variables define how the product will be produced. Solution alternatives are created by mapping the requirements specified in one domain to a set of characteristic parameters in an adjacent domain. The mapping between the customer and functional domains is defined as concept design; (Toote idee) The mapping between functional and physical domains is product design (toote konstrueerimine); The mapping between the physical and process domains corresponds to process design. (Tootmise kavandamine)

ME Seminar 18. jaanuar 2006 Axiomatic Design IdeedKonstrueerimine Tootmise kavad Variandid Vasakpoolne valdkond “Mida tahame saavutada?” Parempoolne “Kuidas kavatseme seda saada?”

ME Seminar 18. jaanuar 2006 Axiomatic Design Customer DomainThe benefits customers seek Functional DomainFunctional requirements of the design solution Physical DomainDesign parameters of the design solution Process DomainProcess variables Functional requirement Functional requirements (FRs) are a minimum set of independent requirements that completely characterize the functional needs of the design solution in the functional domain. ConstraintConstraints (Cs) are bounds on acceptable solutions. Design ParameterDesign parameters (DPs) are the elements of the design solution in the physical domain that are chosen to satisfy the specified FRs. Process variableProcess variables (PVs) are the elements in the process domain that characterize the process that satisfies the specified DPs.

ME Seminar 18. jaanuar 2006 Axiomatic Design

ME Seminar 18. jaanuar 2006 Axiomatic Design The output of each domain evolves from abstract concepts to detailed information in a top-down or hierarchical manner Valdkondade väljundid arenevad abstraktsetest ideedest kuni üksikasjaliste kirjeldusteni Two design axioms provide a rational basis for evaluation of proposed solution alternatives and the subsequent selection of the best alternative Kaks järgnevat konstrueerimise aktsioomi on ratsionaalseks aluseks lahendusvariantide hindamiseks ja valikuks The first axiom is the independent axiom, and it states that a good design maintains the independence of the functional requirements Esimene, sõltumatuse aktsioom ütleb, et lahend on hea vaid siis, kui on tagatud funktsionaalsusnõuete sõltumatus The second axiom is the information axiom and it establishes information content as a relative measure for evaluating and comparing alternative solutions that satisfy the independence axiom Teine, informatsiooni aktsioom ütleb, et info sisu peab tagama selliste lahendusvariantide võrdlemise ja hindamise, mis vastavad esimesele aktsioomile.

ME Seminar 18. jaanuar 2006 Axiomatic Design With QFD (Quality Function Deployment, "the voice of the customer"), designers gather information from customers about their requirements and the relative importance of each. This information helps the designer to choose which FRs must be present and which may be safely ignored. When a designer has selected an FR and wants to identify alternative DPs to achieve it, TRIZ (the theory of inventive problem solving) can be helpful in generating alternatives. After choosing a DP to satisfy an FR, the designer uses robust design to optimize the design of this particular DP, which helps to reduce the information content of the design. The designer follows the axiomatic design process and uses the various techniques when appropriate. Axiomatic design helps the designer avoid mistakes such as unknowingly attempting to optimize a coupled design.