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Machines, Volume 12, Issue 5

May 2024 - 71 articles

Cover Story: Even the most advanced railroad systems can be adversely affected by something as basic as fallen leaves on tracks. Leaf contamination poses a recurring challenge for railway operators, leading to decreased braking efficiency and potentially hazardous events like station overruns. By better comprehending how leaves reduce adhesion, this research aims to enhance railroad engineering practices and mitigate the adverse impact of leaves on train braking and traction. Using the high-precision Virginia Tech-Federal Railroad Administration (VT-FRA) Roller Rig, this study examines the decrease in traction and braking forces, known collectively as "adhesion," in relation to leaf volume. The results indicate that even small amounts of leaves can cause a large decrease in adhesion. View this paper
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Articles (71)

  • Article
  • Open Access
4 Citations
2,335 Views
21 Pages

Influence of Machine Tool Operating Conditions on the Resulting Circularity and Positioning Accuracy

  • Matej Sarvas,
  • Michal Holub,
  • Tomas Marek,
  • Jan Prochazka,
  • Frantisek Bradac and
  • Petr Blecha

The operating conditions of the production process significantly influence the resulting dimensional and form accuracy of the workpiece. The operating conditions include the position of the workpiece location, with internal and external heat sources...

  • Article
  • Open Access
3 Citations
1,855 Views
13 Pages

Mechanism Analysis and Optimization Design of Exoskeleton Robot with Non-Circular Gear–Pentabar Mechanism

  • Guibin Wang,
  • Maile Zhou,
  • Hao Sun,
  • Zhaoxiang Wei,
  • Herui Dong,
  • Tingbo Xu and
  • Daqing Yin

To address the complex structure of existing rod mechanism exoskeleton robots and the difficulty in solving the motion trajectory of multi−rod mechanisms, an exoskeleton knee robot with a differential non−circular gear–pentarod mech...

  • Article
  • Open Access
4 Citations
2,217 Views
26 Pages

An Advanced IBVS-Flatness Approach for Real-Time Quadrotor Navigation: A Full Control Scheme in the Image Plane

  • Ahmed Alshahir,
  • Khaled Kaaniche,
  • Mohammed Albekairi,
  • Shahr Alshahr,
  • Hassen Mekki,
  • Anis Sahbani and
  • Meshari D. Alanazi

This article presents an innovative method for planning and tracking the trajectory in the image plane for the visual control of a quadrotor. The community of researchers working on 2D control widely recognizes this challenge as complex, because a tr...

  • Article
  • Open Access
4 Citations
3,022 Views
19 Pages

Optimizing Machining Efficiency in High-Speed Milling of Super Duplex Stainless Steel with SiAlON Ceramic Inserts

  • Monica Guimarães,
  • Victor Saciotto,
  • Qianxi He,
  • Jose M. DePaiva,
  • Anselmo Diniz and
  • Stephen Veldhuis

Super duplex stainless steels (SDSSs) are widely utilized across industries owing to their remarkable mechanical properties and corrosion resistance. However, machining SDSS presents considerable challenges, particularly at high speeds. This study in...

  • Article
  • Open Access
2 Citations
1,971 Views
13 Pages

Aimed at the problem of human–machine interaction between patients and robots in the process of using rehabilitation robots for rehabilitation training, this paper proposes a human–machine interactive control method based on an independen...

  • Article
  • Open Access
4 Citations
1,666 Views
15 Pages

Ejector-cleaning devices for abrasive jet machining have various practical applications. The working nozzle is one of the device’s key elements affecting the treated surface quality. There arises the necessity for new approaches to achieving an...

  • Review
  • Open Access
5 Citations
2,638 Views
33 Pages

Analytical modelling is an effective approach to obtaining a gear dynamic response or vibration pattern for health monitoring and useful life prediction. Many researchers have modelled this response with various fault conditions commonly observed in...

  • Article
  • Open Access
2 Citations
1,920 Views
21 Pages

Despite their complex design, cycloidal gearboxes are characterized by high efficiency. Nevertheless, due to friction, some power is lost during gearbox operation. Basically, these losses occur in two structural nodes: the cycloid gearing and the out...

  • Article
  • Open Access
3 Citations
1,627 Views
17 Pages

Perception-based fidelity evaluation metrics are crucial in driving simulators, as they play a key role in the automatic tuning, assessment, and comparison of motion cueing algorithms. Nevertheless, there is presently no unified and effective evaluat...

  • Article
  • Open Access
1,462 Views
25 Pages

To address the problem of problematic spray design inside mining anchor-digging equipment, a switching seal using a permanent magnet eddy current drive is initially presented here. The layer model of the permanent magnet eddy current structure is est...

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Machines - ISSN 2075-1702Creative Common CC BY license