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Machines, Volume 10, Issue 6

June 2022 - 84 articles

Cover Story: In air compressors (e.g., for fuel cell cars), the use of foil bearings provides many advantages. They have low friction, require little installation space and, due to media lubrication, do not require oils or peripheral equipment. Their full potential is shown at speeds of 100,000 rpm and more. On the downside, the frequent start–stop cycles in such applications are critical, as they can lead to higher wear and, thus, a shorter service life. With actively controllable bearings, an attempt is made to achieve better behavior in the start-up range. The cover picture shows an enhanced test rig which was used to examine the static switching states of such a bearing. The two test bearings (for each switching state) were compared in terms of lift-off speed, frictional torque, eccentricity, and stiffness. View this paper
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Articles (84)

  • Review
  • Open Access
7 Citations
3,353 Views
22 Pages

Review and Comparison of Clearance Control Strategies

  • Bingwei Gao,
  • Wei Shen,
  • Hao Guan,
  • Wei Zhang and
  • Lintao Zheng

20 June 2022

The nonlinearity of clearance has a significant influence on the performance of a system while ensuring the reliability of the variable-speed transmission, and hinders the development of the controlled object according to the predetermined trajectory...

  • Editorial
  • Open Access
1 Citations
1,793 Views
2 Pages

Advanced Autonomous Machines and Design Developments

  • Hamid Reza Karimi,
  • Kai Cheng and
  • Yanhua Zou

20 June 2022

With the rapid technological development of machines in different applications such as vehicles, robotics, and manufacturing, concerns may arise with regard to complexity, safety, performance, and maintenance costs associated with the machine operati...

  • Article
  • Open Access
4 Citations
2,246 Views
15 Pages

19 June 2022

The calculation of tooth wear under mixed elastohydrodynamic lubrication is very complex and requires consideration of many conditions such as load distribution in the tooth meshing zone, micro-convex elastoplastic deformation and tooth surface tempe...

  • Article
  • Open Access
76 Citations
7,946 Views
20 Pages

Tracking and Counting of Tomato at Different Growth Period Using an Improving YOLO-Deepsort Network for Inspection Robot

  • Yuhao Ge,
  • Sen Lin,
  • Yunhe Zhang,
  • Zuolin Li,
  • Hongtai Cheng,
  • Jing Dong,
  • Shanshan Shao,
  • Jin Zhang,
  • Xiangyu Qi and
  • Zedong Wu

17 June 2022

To realize tomato growth period monitoring and yield prediction of tomato cultivation, our study proposes a visual object tracking network called YOLO-deepsort to identify and count tomatoes in different growth periods. Based on the YOLOv5s model, ou...

  • Article
  • Open Access
6 Citations
3,350 Views
14 Pages

17 June 2022

The contact behaviour between an ellipsoid and a rigid plane is significant in research on bearing and assembly joint surfaces. However, an empirical relationship between an elastic–plastic ellipsoid and a rigid plane has not been established....

  • Article
  • Open Access
9 Citations
2,788 Views
16 Pages

DMnet: A New Few-Shot Framework for Wind Turbine Surface Defect Detection

  • Jinyun Yu,
  • Kaipei Liu,
  • Liang Qin,
  • Qiang Li,
  • Feng Zhao,
  • Qiulin Wang,
  • Haofeng Liu,
  • Boqiang Li,
  • Jing Wang and
  • Kexin Li

16 June 2022

In the field of wind turbine surface defect detection, most existing defect detection algorithms have a single solution with poor generalization to the dilemma of insufficient defect samples and have unsatisfactory precision for small and concealed d...

  • Article
  • Open Access
7 Citations
4,143 Views
22 Pages

16 June 2022

The goal of this investigation is to propose a series/parallel hybrid electric power system for ultralight aviation designed to improve safety and, possibly, reduce fuel consumption. The power system consists of a Wankel engine, two electric machines...

  • Article
  • Open Access
22 Citations
3,272 Views
18 Pages

Rolling Bearing Fault Diagnosis Based on Multiscale Permutation Entropy and SOA-SVM

  • Xi Zhang,
  • Hongju Wang,
  • Mingming Ren,
  • Mengyun He and
  • Lei Jin

16 June 2022

The service conditions of underground coal mine equipment are poor, and it is difficult to accurately extract the fault characteristics of rolling bearings. In order to better improve the accuracy of the fault identification of rolling bearings, a fa...

  • Article
  • Open Access
2 Citations
3,853 Views
15 Pages

16 June 2022

Spur shaping cutters, the most versatile gear cutting tools, are used to produce gears that are limited in general cutting cases, such as internal gears and stacked gears. The side clearance angle, which is formed by the profile shifting on the tooth...

  • Article
  • Open Access
8 Citations
3,341 Views
25 Pages

16 June 2022

Multi-lip reciprocating seals are extensively used in the subject of engineering equipment. However, the current research on the tribology of reciprocating seals mainly focused focuses on the numerical analysis of single-lip seals. In order to study...

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Machines - ISSN 2075-1702