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Machines, Volume 8, Issue 4

December 2020 - 31 articles

Cover Story: Automatic ball balancing is a technique adopted in rotordynamics to automatically reduce unknown rotor unbalance. This technique is appealing as it can ease a panoply of balancing issues considerably. The presence of stiction, however, scatters consistent qualitative balancing, which has led to limited implementation in the industry. Temporary speed reduction, a recent technique, could be used as a countermeasure for the stiction-induced scattering. This paper presents an in-depth study detailing how the technique should be implemented to guarantee effective balancing. The main findings of the study are that the adverse effects of stiction can be contained considerably using the speed reduction technique, especially in the under-excited range where a ball balancer behaves poorly when adopting a standard run-up profile. View this paper
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Articles (31)

  • Article
  • Open Access
11 Citations
3,256 Views
15 Pages

21 December 2020

Brushing with bonded abrasives is a finishing process which can be used for the surface improvement of various materials. Since the machining mechanisms of abrasive brushing processes are still largely unknown and little predating research was done o...

  • Article
  • Open Access
77 Citations
7,950 Views
15 Pages

MARMA: A Mobile Augmented Reality Maintenance Assistant for Fast-Track Repair Procedures in the Context of Industry 4.0

  • Fotios K. Konstantinidis,
  • Ioannis Kansizoglou,
  • Nicholas Santavas,
  • Spyridon G. Mouroutsos and
  • Antonios Gasteratos

20 December 2020

The integration of exponential technologies in the traditional manufacturing processes constitutes a noteworthy trend of the past two decades, aiming to reshape the industrial environment. This kind of digital transformation, which is driven by the I...

  • Article
  • Open Access
3 Citations
3,782 Views
34 Pages

18 December 2020

Environmental impact and recycling have been increasingly frequent topics in recent years. At the same time, the life cycle of products has increasingly become shorter, as the escalating competitive market requires new products in smaller pieces. Fro...

  • Article
  • Open Access
2 Citations
3,072 Views
18 Pages

17 December 2020

This paper is devoted to the development and improvement of mechanisms for the functioning of an automated system for correcting the points of the planned trajectory of the tool of a laser robotic welding complex in the pre-process. Correction of the...

  • Article
  • Open Access
8 Citations
2,766 Views
19 Pages

16 December 2020

This paper proposes a methodology for automated assessment of fatigue damage, which has been tested and validated with polycrystalline-alloy (Aℓ7075-T6) specimens on an experimental apparatus. Based on an ensemble of time series of ultrasonic test (U...

  • Article
  • Open Access
94 Citations
13,724 Views
34 Pages

12 December 2020

3D printing conquers new branches of production due to becoming a more reliable and professional method of manufacturing. The benefits of additive manufacturing such as part optimization, weight reduction, and ease of prototyping were factors acceler...

  • Article
  • Open Access
4 Citations
4,753 Views
20 Pages

Inter-Stage Dynamic Performance of an Axial Compressor of a Twin-Shaft Industrial Gas Turbine

  • Samuel Cruz-Manzo,
  • Senthil Krishnababu,
  • Vili Panov and
  • Chris Bingham

9 December 2020

In this study, the inter-stage dynamic performance of a multistage axial compressor is simulated through a semi-empirical model constructed in the Matlab Simulink environment. A semi-empirical 1-D compressor model developed in a previous study has be...

  • Article
  • Open Access
15 Citations
6,601 Views
16 Pages

Design, Simulation, and Preliminary Validation of a Four-Legged Robot

  • Stefano Rodinò,
  • Elio Matteo Curcio,
  • Antonio di Bella,
  • Mattia Persampieri,
  • Michele Funaro and
  • Giuseppe Carbone

4 December 2020

This paper outlines the design process for achieving a novel four-legged robot for exploration and rescue tasks. This application is also intended as an educational mean for masters’ students aiming at gaining skills in designing and operating...

  • Article
  • Open Access
16 Citations
6,055 Views
15 Pages

24 November 2020

Even though scientific studies of smart stents are extensive, current smart stents focus on pressure sensors. This paper presents a novel implantable biocompatible smart stent for monitoring eventual restenosis. The device is comprised of a metal mes...

  • Communication
  • Open Access
16 Citations
2,478 Views
12 Pages

20 November 2020

With the continuous optimization of energy structures, wind power generation has become the dominant new energy source. The strong random fluctuation of natural wind will bring challenges to power system dispatching, so it is necessary to predict win...

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Machines - ISSN 2075-1702