scholarly journals Main Problems Using DEM Modeling to Evaluate the Loose Soil Collection by Conceptual Machine as a Background for Future Extraterrestrial Regolith Harvesting DEM Models

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1404
Author(s):  
Przemysław Młynarczyk ◽  
Damian Brewczyński
Keyword(s):  
3D Printing ◽  
Product Development ◽  
Rapid Development ◽  
Subsequent Development ◽  
Integrated Approach ◽  
Mining Machine ◽  
Dem Simulation ◽  
Loose Soil ◽  
Rapid Product Development ◽  
Key Factor

Nowadays, rapid product development is a key factor influencing a company’s success. In the Space 4.0. era, an integrated approach with the use of 3D printing and DEM modeling can be particularly effective in the development of technologies related to space mining. Unfortunately, both 3D printing and DEM modeling are not without flaws. This article shows the possibilities and problems resulting from the use of DEM simulation and 3D printing simultaneously in the rapid development of a hypothetical mining machine. For the subsequent development of the regolith harvesting model, loose soil harvesting simulations were performed and the underlying problems were defined and discussed. The results show that it is possible to use both technologies simultaneously to be able to effectively and accurately model the behavior of this type of machine in various gravitational conditions in the future.

scholarly journals Challenges and Enablers for Rapid Product Development

2018 ◽  
Vol 5 (1) ◽  
pp. 25-49
Author(s):  
Jordan Verrollot ◽  
Arto Tolonen ◽  
Janne Harkonen ◽  
Harri J. O. Haapasalo
Keyword(s):  
Product Development ◽  
New Product Development ◽  
Business Processes ◽  
Rapid Development ◽  
New Product ◽  
Product Data Management ◽  
Timely Manner ◽  
Rapid Product Development ◽  
Business Opportunities ◽  
Strong Market Position

This article describes how new product development (NPD) is critical to maintaining a strong market position. However, full-scale NPD may consume too much time and resources when necessary to react quickly to customer needs or emerging business opportunities. Rapid development (RaDe) is a type of incremental product development complementing the organizations' existing NPD process. In RaDe, new sales items are created by redesigning or upgrading existing products inexpensively, and in a timely manner. This article aims at clarifying the challenges and enablers relating to RaDe implementation in four case companies and by the means of reviewing literature. The identified challenges include the difficulty of differentiating between product developments models, the lack of clear definition for RaDe and issues in product data management. The enablers include structuring and managing projects differently compared to NPD, the utilization of existing supply-chain capabilities and the designed products fitting the current business processes to enable rapid product ramp-ups.

scholarly journals Designing of an innovative extrusion system for metallic parts made by desktop 3D printing method

2018 ◽  
Vol 178 ◽  
pp. 02009
Author(s):  
Razvan Pacurar ◽  
Ancuta Pacurar ◽  
Serban Pop
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Product Development ◽  
Industrial Companies ◽  
Rapid Product Development ◽  
Innovative Solution ◽  
Technical University ◽  
Metallic Parts ◽  
Metal Extrusion ◽  
Printing Method

Desktop 3D Printing for metallic parts is a new direction and represents one of the latest trends within the Additive Manufacturing domain, being given and defined mainly by the requirements of the industrial companies in terms of materials and products that needs to be rapidly delivered on the market. The article presents an innovative solution that was developed at the Technical University of Cluj-Napoca in this domain, for the Rapid Product Development of Parts made by metal extrusion.

Education in Management of Data Created by New Technologies for Rapid Product Development in SMEs

2003 ◽  
Vol 17 (6) ◽  
pp. 423-429
Author(s):  
Andrew Shaw ◽  
David Aitchison
Keyword(s):  
Product Development ◽  
Undergraduate Students ◽  
New Technologies ◽  
Rapid Development ◽  
Research Programme ◽  
Industrial Sector ◽  
Product Data Management ◽  
Management Systems ◽  
Rapid Product Development ◽  
Information Management Systems

This paper presents outcomes from a research programme aimed at developing new tools and methodologies to assist small and medium-sized enterprises (SMEs) in rapid product development (RPD). The authors suggest that current education strategies for the teaching of RPD tools and methodologies may be of limited value unless those strategies also involve consideration of the data and information management systems in which the knowledge is to be used. The research identified knowledge of product data management systems, particular to the discrete product development industries in New Zealand, which we believe needed to be transferred to the industrial sector to assist in the rapid development of products. These findings have led to iterative modifications to a Computer-Aided Product Development (CAPD) course for final-year undergraduate students, so that they can be better equipped in the management of data associated with RPD tools and methodologies. The paper builds on previously published work by the authors and describes the mechanisms by which students' awareness of the associated technologies, methods and data is increased.

Surface functionalization – a new functional dimension added to 3D printing

2020 ◽  
Vol 8 (36) ◽  
pp. 12380-12411
Author(s):  
Pan Jiang ◽  
Zhongying Ji ◽  
Xiaolong Wang ◽  
Feng Zhou
Keyword(s):  
3D Printing ◽  
Surface Functionalization ◽  
Rapid Development ◽  
Functional Dimension

Various requirements for 3D printing raised by actual applications in different fields have provoked the rapid development of technologies together with various specific materials.

scholarly journals Estimation of resistance force at steady-state sinkage for cylindrical wheel-typed lunar/planetary exploration rovers with function of push–pull locomotion

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Daisuke Fujiwara ◽  
Naoki Tsujikawa ◽  
Tetsuya Oshima ◽  
Kojiro Iizuka
Keyword(s):  
Steady State ◽  
Estimation Method ◽  
Planetary Exploration ◽  
Experimental Result ◽  
Resistance Force ◽  
Estimation Model ◽  
Loose Soil ◽  
Key Factor ◽  
The Relationship ◽  
Resistance Forces

Abstract Planetary exploration rovers have required a high traveling performance to overcome obstacles such as loose soil and rocks. Push-pull locomotion rovers is a unique scheme, like an inchworm, and it has high traveling performance on loose soil. Push-pull locomotion uses the resistance force by keeping a locked-wheel related to the ground, whereas the conventional rotational traveling uses the shear force from loose soil. The locked-wheel is a key factor for traveling in the push-pull scheme. Understanding the sinking behavior and its resistance force is useful information for estimating the rover’s performance. Previous studies have reported the soil motion under the locked-wheel, the traction, and the traveling behavior of the rover. These studies were, however, limited to the investigation of the resistance force and amount of sinkage for the particular condition depending on the rover. Additionally, the locked-wheel sinks into the soil until it obtains the required force for supporting the other wheels’ motion. How the amount of sinkage and resistance forces are generated at different wheel sizes and mass of an individual wheel has remained unclear, and its estimation method hasn’t existed. This study, therefore, addresses the relationship between the sinkage and its resistance force, and we analyze and consider this relationship via the towing experiment and theoretical consideration. The results revealed that the sinkage reached a steady-state value and depended on the contact area and mass of each wheel, and the maximum resistance force also depends on this sinkage. Additionally, the estimation model did not capture the same trend as the experimental results when the wheel width changed, whereas, the model captured a relatively the same trend as the experimental result when the wheel mass and diameter changed.

scholarly journals Foundation Piles—A New Feature for Concrete 3D Printers

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2545
Author(s):  
Marcin Hoffmann ◽  
Krzysztof Żarkiewicz ◽  
Adam Zieliński ◽  
Szymon Skibicki ◽  
Łukasz Marchewka
Keyword(s):  
3D Printing ◽  
Rapid Development ◽  
Construction Materials ◽  
Shallow Foundation ◽  
Soil Reinforcement ◽  
3D Printer ◽  
Permanent Formwork ◽  
3D Printers ◽  
New Feature ◽  
The Cost

Foundation piles that are made by concrete 3D printers constitute a new alternative way of founding buildings constructed using incremental technology. We are currently observing very rapid development of incremental technology for the construction industry. The systems that are used for 3D printing with the application of construction materials make it possible to form permanent formwork for strip foundations, construct load-bearing walls and partition walls, and prefabricate elements, such as stairs, lintels, and ceilings. 3D printing systems do not offer soil reinforcement by making piles. The paper presents the possibility of making concrete foundation piles in laboratory conditions using a concrete 3D printer. The paper shows the tools and procedure for pile pumping. An experiment for measuring pile bearing capacity is described and an example of a pile deployment model under a foundation is described. The results of the tests and analytical calculations have shown that the displacement piles demonstrate less settlement when compared to the analysed shallow foundation. The authors indicate that it is possible to replace the shallow foundation with a series of piles combined with a printed wall without locally widening it. This type of foundation can be used for the foundation of low-rise buildings, such as detached houses. Estimated calculations have shown that the possibility of making foundation piles by a 3D printer will reduce the cost of making foundations by shortening the time of execution of works and reducing the consumption of construction materials.

scholarly journals Mycoplasmas and Their Antibiotic Resistance: The Problems and Prospects in Controlling Infections

Acta Naturae ◽  
2016 ◽  
Vol 8 (2) ◽  
pp. 24-34 ◽  
Author(s):  
O. A. Chernova ◽  
E. S. Medvedeva ◽  
A. A. Mouzykantov ◽  
N. B. Baranova ◽  
V. M. Chernov
Keyword(s):  
Antibiotic Resistance ◽  
Molecular Basis ◽  
Rapid Development ◽  
Integrated Approach ◽  
Stress Factors ◽  
Antimicrobial Drugs ◽  
Cellular Processes ◽  
Complex Processes ◽  
Development Of Resistance ◽  
Higher Eukaryotes

The present review discusses the problem of controlling mycoplasmas (class Mollicutes), the smallest of self-replicating prokaryotes, parasites of higher eukaryotes, and main contaminants of cell cultures and vaccines. Possible mechanisms for the rapid development of resistance to antimicrobial drugs in mycoplasmas have been analyzed. Omics technologies provide new opportunities for investigating the molecular basis of bacterial adaptation to stress factors and identifying resistomes, the total of all genes and their products contributing to antibiotic resistance in microbes. The data obtained using an integrated approach with post-genomics methods show that antibiotic resistance may be caused by more complex processes than has been believed heretofore. The development of antibiotic resistance in mycoplasmas is associated with essential changes in the genome, proteome, and secretome profiles, which involve many genes and proteins related to fundamental cellular processes and virulence.

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