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Author

Xiao Yuan

Other affiliations: Tsinghua University
Bio: Xiao Yuan is an academic researcher from University of Southern California. The author has contributed to research in topics: Sulfur concrete & Rotor (electric). The author has an hindex of 7, co-authored 15 publications receiving 405 citations. Previous affiliations of Xiao Yuan include Tsinghua University.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a framework for performance-based laboratory testing of cementitious mixtures for construction-scale 3D printing is developed, where workability of a fresh "printing mixture" is studied in terms of print quality, shape stability, and printability window.

411 citations

Journal ArticleDOI
TL;DR: The high precision and responsiveness of the developed system demonstrates the great potential for computer vision as a real-time quality monitoring and control tool for robotic construction.

73 citations

Journal ArticleDOI
TL;DR: In this article, the authors report on the experiments with the Contour Crafting Automated Construction process using sulfur concrete as the choice of construction material and compare the results of simulation with the results obtained from experiments performed at centimeter and meter scales.
Abstract: Purpose This paper aims to report on the experiments with the Contour Crafting Automated Construction process using sulfur concrete as the choice of construction material. Design/methodology/approach Several experiments have been performed at centimeter and meter scales. A finite element analysis simulation model for the behavior of sulfur concrete-based structures has been developed. Experimental results were compared with the results of simulation. Findings Sulfur concrete has numerous terrestrial applications and is potentially an ideal construction material for planetary construction. Originality/value Experimental samples of sulfur concrete were fabricated using a novel mixer/extrusion system. The mechanism was proven to be durable and stable after more than 500 h of work.

72 citations

Proceedings ArticleDOI
10 Sep 2013
TL;DR: In this paper, a synergetic simulation plan is proposed for utilizing these maturing systems coupled with a unique, patented robotic fabrication technology called Contour Crafting, tailored for swift and reliable lunar infrastructure development.
Abstract: Several unique systems including the Lunar Electric Rover, the unpressurized Chariot rover, the versatile light-weight crane and Athlete cargo transporter as well as the habitat module mockups and a new generation of spacesuits are undergoing coordinated tests at NASA’s facility for Desert Research and Test Studies (D-RATS). A synergetic simulation plan is proposed for utilizing these maturing systems coupled with a unique, patented robotic fabrication technology called Contour Crafting, tailored for swift and reliable lunar infrastructure development. Landing pads, roads, shade walls and thermal and micrormeteoritic shield and other unpressurized structures that make up a majority of the initial lunar settlement infrastructure may be built using this technology, fully utilizing InSitu Resource Utilization(ISRU) strategy. The intent is to increase astronaut safety, improve buildup performance, ameliorate lunar dust interference and concerns, and reduce time-tocommission, all in an economic manner.

27 citations

Journal ArticleDOI
TL;DR: An automated layer defect detection system for construction 3D printing which is able to detect deformations in the printed concrete layers extracted from the images using the CNN model is proposed.
Abstract: In this paper, an automated layer defect detection system for construction 3D printing is proposed. Initially, a step-by-step procedure is implemented to develop a deep convolutional neural network that receives images as input and is able to distinguish concrete layers from other surrounding objects through semantic pixel-wise segmentation. Using data augmentation techniques, 1M labeled images are generated and used to train and test the CNN model. Then, a defect detection module is developed which is able to detect deformations in the printed concrete layers extracted from the images using the CNN model. The evaluation results based on metrics such as accuracy, F1 score, and miss rate verify the acceptable performance of the developed system.

27 citations


Cited by
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Journal ArticleDOI
TL;DR: A comprehensive review of the main 3D printing methods, materials and their development in trending applications was carried out in this paper, where the revolutionary applications of AM in biomedical, aerospace, buildings and protective structures were discussed.
Abstract: Freedom of design, mass customisation, waste minimisation and the ability to manufacture complex structures, as well as fast prototyping, are the main benefits of additive manufacturing (AM) or 3D printing. A comprehensive review of the main 3D printing methods, materials and their development in trending applications was carried out. In particular, the revolutionary applications of AM in biomedical, aerospace, buildings and protective structures were discussed. The current state of materials development, including metal alloys, polymer composites, ceramics and concrete, was presented. In addition, this paper discussed the main processing challenges with void formation, anisotropic behaviour, the limitation of computer design and layer-by-layer appearance. Overall, this paper gives an overview of 3D printing, including a survey on its benefits and drawbacks as a benchmark for future research and development.

4,159 citations

Journal ArticleDOI
TL;DR: In this article, a numerical model was developed to analyse the mechanical behavior of fresh, 3D printed concrete, in the range of 0 to 90 min after material deposition, based on a time-dependent Mohr-Coulomb failure criterion and linear stress-strain behaviour up to failure.

422 citations

Journal ArticleDOI
TL;DR: In this paper, a framework for performance-based laboratory testing of cementitious mixtures for construction-scale 3D printing is developed, where workability of a fresh "printing mixture" is studied in terms of print quality, shape stability, and printability window.

411 citations

Journal ArticleDOI
TL;DR: In this article, the effects of print-time interval on the inter-layer strength, along with compressive and flexural strengths of extrusion-based 3D printed concrete in different directions were investigated.

322 citations

Journal ArticleDOI
TL;DR: In this article, the main required concrete states for extrusion and deposition processes are analyzed with respect to required performances and potential admixtures, and possible side effects and incompatibilities are discussed, as well as how they could be unconventionally used for printable concrete purposes.

301 citations