Abstract
Reliability is a major performance index in the electromechanical product conceptual design decision process. As the function is the purpose of product design, the risk of scheme design is easy to be caused when there is a failure (i.e., function failure). However, existing reliability analysis models focus on the failure analysis of functions but ignore the quantitative risk assessment of conceptual schemes when function failures occur. In addition, design information with subjectivity and fuzziness is difficult to introduce the risk index into the early design stage for comprehensive decisions. To fill this gap, this paper proposes a conceptual scheme decision model for mechatronic products driven by the risk of function failure propagation. Firstly, the function structure model is used to construct the function fault propagation model, so as to obtain the influence degree of the subfunction failure. Secondly, the principle solution weight is calculated when the function failure is propagated, and the influence degree of the failure mode is integrated to obtain the severity of the failure mode on the product system. Thirdly, the risk value of failure mode is calculated by multiplying the severity and failure probability of failure mode, and the risk value of the scheme is obtained based on the influence relationship between failure modes. Finally, the VIKOR (Višekriterijumska Optimizacija i kompromisno Rešenje) method is used to make the optimal decision for the conceptual scheme, and then take the cutting speed regulating device scheme of shearer as an example to verify the effectiveness and feasibility of the proposed decision model.
Highlights
Conceptual design decision is a major part of new product development (NPD)
The research of reliability analysis mainly focuses on the modeling of design risk propagation models [5], and the analysis of structural system failure modes in detailed design [6], which leads to concept design failure risk not being considered effective, and effective reliability evaluation data cannot be provided in conceptual scheme (CS) decision process
With the increasing awareness of concept design decision reliability, the proposed decision method originally takes function failures into consideration in the risk quantitative calculation process of each principle solution and constructing a conceptual scheme decision model driven by the risk of function failure propagation
Summary
Conceptual design decision is a major part of new product development (NPD). It seeks the value of schemes by decision objectives, judges, and rank candidate schemes with the help of multi-objective decision models to obtain the optimal scheme. The process of scheme risk assessment in case of function failure involves subjectivity, a fuzzy logic model is necessary to be adopted to reduce the uncertainty of decision results It can be seen from the above that the traditional reliability decision model of CS does not consider the process of function failure analysis and reasoning, and ignores the risk impact of the failure of principle solution on the overall scheme value. To this end, the decision model for the mechatronic product conceptual scheme based on the function failure propagation analysis is proposed.
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