Abstract
Robust and Axiomatic design, a property-based approach in design, is applied and integrated into a new methodology for developing Functional Requirements (FR) or Design Parameters (DP). The reliability of the design structure and the elementary reliability of the design components are used as a functional requirement of the automotive gearbox, in relation to the service life and operation conditions, and also as a design constraint in analytical relationships. For this purpose, elementary reliability and allowable stress are defined in a specific way. The automotive gearbox, operating under varying and random operation conditions, is used as a case study. The same design structure has to operate under different operation conditions. In these circumstances, the carrying capacity as a functional requirement is related to the operation conditions and operation regime. The model presented in this paper, as well as a computer program, enable identification of this carrying capacity. This paper discusses an interdisciplinary and multi-methodological integrated approach to the presented task. Experimental data regarding the failure probability of gearbox components and the probability of operation conditions processing, the decomposition of gearbox structure, and the elementary reliability treatment as a component of design property are only some of the methods applied.
Highlights
The functional requirements of design structures, for example, the load capacity, reliability, service life, etc. are strongly related to operation conditions that are, as a rule, random and very often uncertain
This paper offers a new and specific approach based on the integration of axiomatic and robust methodology directed towards load capacity identification of the existing design structure or the design parameters definition in the design process of the new mechanical structure
The main objective of this paper is to develop a procedure that can correlate the functional requirements, random operation conditions and other limitations to the design parameters and provide a model for the design of a certain mechanical structure
Summary
The functional requirements of design structures, for example, the load capacity, reliability, service life, etc. are strongly related to operation conditions that are, as a rule, random and very often uncertain. An automotive gearbox has been taken for the case study, because it represents a design structure with very variable operation conditions. The Property-based design approach together with the system structure and functional requirements or quality indicators deduction provides possibilities for arranging specific procedures and approaches for the design parameters or the carrying capacity identification for design structures such as automotive gearboxes. Robust Design is a verified methodology, which provides good results on the first attempt It provides good design results (the relationship between functional requirements and design parameters) under variable operation conditions, and is applied for solving problems in many kinds of specific design cases. The desired elementary reliability at the end of the service life of a design component can be applied as a design constraint for the design parameters definition [5] and [6]
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