Abstract Laser Powder Bed Fusion (LPBF) brings the possibility to manufacture innovative near-net-shape part designs. But unfortunately, some designed surfaces suffer from rough surface finish due characteristics of LPBF process. This paper explores trends in managing roughness and through a space industry case study, proposed process that uses Additive Manufacturing Design Artefacts (AMDAs) is...

There are situations that Decision Making Units (DMU’s) have uncertain information and their inputs and outputs cannot alter redially. To this end, this paper combines the rough set theorem (RST) and Data Envelopment Analysis (DEA) and proposes a non-redial Rough-DEA (RDEA) model so called additive rough-DEA model and illustrates the proposed model by a numerical example.  

Bed load sediment transport governed by particle saltation in supercritical open channel flows causes bedrock incision high-gradient mountain streams and hydro-abrasion at hydraulic structures. Hence, a better understanding of turbulent flow characteristics dynamics is prime importance for the prediction river landscape evolution, sustainable design To this end, we experimentally investigated s...

The paper is devoted to concern a relationship between rough set theory and universal algebra. Notions of lower and upper rough approximations on an algebraic structure induced by an ideal are introduced and some of their properties are studied. Also, notions of rough subalgebras and rough ideals with respect to an ideal of an algebraic structure, which is an extended notion of subalgebras and ...

Abstract With the creation of additive manufacturing production lines and adoption technologies, such as Laser Powder Bed Fusion, standard technologies for mass parts, many considerations arise. In particular, product quality assurance is surely a very important aspect to be considered when talking about production. powder bed fused parts are characterized by specific characteristics, quite rou...

Previous studies showed that macrorough sidewalls increase the stability of step-pool sequences in steep narrow channels due to grain-sidewall interactions (i.e., jamming) and bed shear stress reduction sidewall friction. The main goal this study was quantify for six types using physical model tests. Experiments were conducted a tilting flume with initial slopes 4%–10% fixed rough beds without ...

In this work we incorporate the effect of near-bed coherent flow structures into the entrainment of randomly configured mixed-size sediments. The fourth-order Gram–Charlier type probability density function (GC pdf) of near-bed streamwise velocity is employed to account for the higher-order correlations associated with turbulent bursting. A compilation of the published data over a wide range of...