12 research outputs found
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Mobile Paving System (MPS): A New Large Scale Freeform Fabrication Method
In the last decade, significant opportunities for automation have been identified in the area of
construction. Soaring labor and material costs have driven multiple research efforts in
construction automation. In this paper, we present a novel means for construction automation
that involves the fusion of the rapid prototyping, controls and mechatronics technologies. The
resultant autonomous construction mechanism has been designed for commercial applications.
Mobile Paving System (MPS) is a new freeform fabrication process which is capable of rapidly
producing variable profiles such as curbs and sidewalks out of materials like cement and asphalt.
Path generation and guidance of the construction operation is controlled by a mobile robot. This
article presents an overview of research and development efforts that are aimed at establishing
the feasibility and the potential of the process.Mechanical Engineerin
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Optimizing the Quality of Parts Manufactured by the Automated Plasma Cutting Process Using Response Surface Methodology
Automated plasma cutting is an effective process for building complex two-dimensional metallic
parts in a short period of time. Because the plasma cutting machine has several factors or input
variables to control (e.g., current, cutting speed, torch height) and a variety of part quality
characteristics or response variables to satisfy (e.g., flatness, clean cut, bevel angle), it is very
difficult to find an overall optimum machine setting. In this research, response surface
methodology and desirability functions are used to simultaneously optimize 18 part quality
characteristics. Final results identify an optimal machine configuration that facilitates the
fabrication of parts with close-to-perfect quality for all responses considered.Mechanical Engineerin
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Analyzing the Tensile, Compressive, and Flexural Properties of 3D Printed Abs P430 Plastic Based on Printing Orientation Using Fused Deposition Modeling
To achieve the optimum functionality and mechanical properties in the AM-based parts, it is
vital to fully characterize parts under static mechanical loadings (tension, compression, and
flexure) that are built in different orientations. This research reports the results of the
compression (ASTM standard D695), 4-point flexure (ASTM D790), and tensile (ASTM D 638
Type I) tests on the ABS plastic specimens that are designed according to the ASTM standards
and are built in different orientations using the uPrint SE Plus 3D printer. This study examined
the effects that printing 3D parts in different orientations (build angles) has on the mechanical
properties of ABS P430 plastic. A total of 45 samples (15 tension, 15 compression, and 15
flexure) were printed in 5 orientations; 0 degrees in the XY plane, 45 degrees in the XY plane,
90 degrees in the XY plane, 45 degrees in the Z plane, and 90 degrees in the Z plane. The
hypothesis was that the samples printed 0 degrees in the XY plane would be the strongest in
compression and flexure, and also have the greatest modulus of elasticity. The samples printed
90 degrees in the XY plane were predicted to be the strongest in tension, having the largest
tensile strength and lowest modulus of elasticity. The findings showed that printing 90 degrees in
the XY plane resulted in the highest tensile strength compared to the other orientations, but not
by a significant margin. Printing 0 degrees in the XY plane significantly increased the
compressive and flexure strengths of the material compared to other orientations.Mechanical Engineerin