Tolerances specify the ranges of permissible imperfections so a manufactured part will be acceptable for assembly and use. Standards exist to define classes of tolerances and to ensure proper communication among engineers. The purpose of this research is to continue creating a mathematical model of geometric tolerances. The results from our earlier work show that the proposed math model is comp...

Uncertainties caused by material variation can significantly impair the characteristics of devices. Therefore, it is important to design devices whose performance not damaged even when variations occur. Robust optimization seeks for optimal solutions that are robust fluctuations due uncertainties variation, geometrical assembly tolerances, and changes in physical properties over time real-world...

Tolerance assignment in product design and process planning (machining) affects both the quality and the cost of the overall product cycle. It is a crucial issue to determine how much the tolerance should be relaxed during the assignment process, since a tight tolerance implies a high manufacturing cost and a loose tolerance results in low manufacturing cost. Hence, during tolerance assignment,...

Abstract. The aim of this communication is to present the advantages and disadvantages a Scan-to-BIM process applied heritage building in order obtain advanced technical drawings be used analysis illustration project. whole described includes: survey planification data acquisition with Terrestrial Laser Scanner; processing cleaning point cloud; 3D mathematical modelling; proposal for semi-autom...

Abstract Many tolerancing problems on mechanical assemblies involve a functional requirement depending chain of parallel dimensions individual parts. In these one-dimensional cases, simple methods are available for the analysis and allocation dimensional tolerances. However, they difficult to extend geometric tolerances, which must be translated into equivalent tolerances; this allows but makes...

For an engineering design, tolerances in design parameters are selected so that within these tolerances, we guarantee the desired functionality. Feasible algorithms are known for solving the corresponding computational problems: the problem of finding tolerances that guarantee the given functionality, and the problem of checking whether given tolerances guarantee this functionality. In this pap...

v V variable (corresponding to entity, attribute, and functional requirement) v interval assigned for V vup upper limit of V viow lower limit of V VnOm nominal value of the variable V any value in V 1. Introduct ion Tolerance design plays an important a role in the relationship between performance and the manufacturing cost of a product. Decreasing the tolerance range will improve performance b...

Abstract To overcome a shortage of flexible and low-cost solutions for wire arc additive manufacturing (WAAM) preprocessing, this work’s objective was to develop validate an in-house computational programme in open-source environment WAAM preprocessing planning. Algorithms reading STL (stereolithography) files implementing rotation, slicing, trajectory planning, machine code generation were ela...

In this paper we deal with sensitivity analysis of combinatorial optimization problems and its fundamental term, the tolerance. For three classes of objective functions (Σ,Π,MAX) we give some basic properties on upper and lower tolerances. We show that the upper tolerance of an element is well defined, how to compute the upper tolerance of an element, and give equivalent formulations when the u...