http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Yudong Bao (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
-
Research on surface image acquisition system of train bearing cylindrical roller
Yudong Bao,Linkai Wu,Ye Dai,Yanling Zhao,Siming Wei 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9
The acquisition of high-quality surface images is an important step in the surface damage detection of bearing rollers. In order to improve the quality of image acquisition and take into account the acquisition efficiency, an image acquisition system is designed in this paper. Through the dynamic analysis method, it is proved that the amplitude of the roller itself has little effect on the image in the acquisition process. Subsequently, the response surface method is used to analyze the interactive effect of the light source intensity, incident angle and roller speed on the image quality, and the optimal acquisition parameter setting value suitable for this acquisition system is found. Finally, the image of the bearing cylindrical roller with surface defects is collected to obtain a clear surface image. This paper can provide reference for the design of high level image acquisition system.
-
Study on the interventional path planning method of bronchoscope catheter
Yudong Bao,Xu LI,Wen Wei,Hejun Liu,Shengqian Qu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
This paper presents a scientific approach to catheter intervention path planning. Firstly, it gives a three-dimensional reconstruction of bronchi using Mimics software based on CT image data. It also measures and analyzes geometric morphological data of the 3D model, which includes diameter, cross-sectional area, node spacing, and curvature at different locations. Secondly, starting from the bending structure of the catheter, Adams simulation experiments and with and without constraints of the serpentine bending structure were conducted. Comparison and analysis of the experimental results of the above three experiments to obtain the quantitative relationship of the bending angle. This study established a simple control device for interventional examination, verified the effect of the method on linear motion of the device, and provided some theoretical basis for future research to realize an automatic machine for human tracheal intervention.
-
Analysis of mechanical contact behavior between the catheter and trachea tissue during bronchoscopy
Yudong Bao,Shengqian Qu,Dongbo Qi,Wen Wei,Yang Zhan,Hejun Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
As for the contact mechanics between the catheter and trachea tissue during bronchoscopy, the anterior and curved part of the catheter were selected for analysis. The material parameters of each sample were obtained by uniaxial tensile experiments. And this paper verified the stress changes during the contact process using ABAQUS software from three aspects: different material property parameters, contact angle, and catheter bending angle. The results show that: when the characteristic parameter is 90°, the force on the trachea is minimal. And the force changes in a small range when the contact angle is kept at 45°-75°. When the catheter enters the next level of the trachea, the bending part is in contact with the trachea wall. At this time, keeping the bending angle at 15°-30° helps to reduce the contact force. This study could provide a theoretical basis for surgical instruments' interventional therapy.
-
Yudong Bao,Zhentao Zhou,Siming Wei,Jingzhong Xiang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.9
Aiming at the detection of surface defects of train bearing rollers, a set of surface defect detection systems for bearing cylindrical rollers based on machine vision is designed in this paper, and the vibration response of the roller during the rolling process is simulated and analyzed. The surface image of the cylindrical roller is obtained by using the area scan camera, and the region of interest is extracted by using edge extraction and template matching algorithm to obtain the cylindrical roller image without background interference. The roller cylinder images are spliced by feature matching and regional fusion methods, and the roller surface defects are extracted by OTSU threshold segmentation, Canny operator edge detection and morphological processing, so as to mark the defects for distinction and identification. The method achieves the purpose of quickly identifying the roller surface defects and rejecting the cylindrical rollers with defective surfaces in train bearings. It provides a theoretical basis for the automation and intelligence of the cylindrical rollers of train bearings in the process of maintenance and repair.
-
Zhou Yudong,Gao Xueguan,Wang Jie,Bao Yulong,Min Cheol Lee 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In this paper, we propose a new method based on signal compression method (SCM) to identify the system that contains dynamic parameters including the capacitive storage, energy dissipator, inductive storage terms. A typical DC motor system is set up and utilized to describe this method. Based on this method, sliding mode control with sliding perturbation observer (SMCSPO) is applied to design controllers. A simulation is performed to express the significance of thorough estimation of the system for the performance of the controller, and this research also experimentally demonstrates that the controller designed based on the dynamics estimated by the method of this paper can have great output tracking performance in a real physical system.
-
Discrete theory of rolling elements for a cageless ball bearing
Yanling Zhao,Qiyu Wang,Mingzhu Wang,Chengyi Pan,Yudong Bao 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4
For the case of magnetic levitation loss, the rotor of an active magnetic bearing is forced by gravity to drop onto stator laminations, and cageless touchdown bearings with high rigidity and load-bearing capacity ensure back-up support. However, the contact collision of rolling elements in a cageless bearing will lead to deterioration of bearing performance and instability of the rotor system. For this purpose, a method based on noncontact between adjacent rolling elements in cageless bearings is proposed in this paper. First, combined with space geometry, the contact process and the change in radius of rotation when a rolling element passes through a discrete groove are analysed, and a clearance between the adjacent rolling elements is generated by changing the rotation speed. Based on this, a design principle for setting a discrete groove on an outer ring raceway is proposed, and the equation for the circumferential discrete clearance for the rolling element based on bearing kinematics is given. Combined with the characteristics of discrete groove structures, a differential equation for the discrete dynamics of rolling elements with variable stiffness coefficients is proposed. We then determine the influence of the discrete groove structure on the discrete motion of the rolling element and bearing dynamic characteristics. Third, the dynamics simulation is combined with a vibration characteristics experiment and discrete motion experiment for a rolling element in a cageless bearing. Our research results show that a discrete groove design for the raceway can be used to realize stable discrete motion of the rolling element, and that such a discrete groove structure will not adversely affect the vibration characteristics of the bearing. The feasibility of the discrete design of cageless bearings with rolling element is verified, and theoretical guidance for the development and application of cageless bearings is provided.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
