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 : Baojun Lin (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Jieqiong Lin,Xian Jing,Mingming Lu,Yan Gu,Baojun Yu,Jiating Tang,Xu Zheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.3
Organically modified ceramics are used as photoresistors in the present work. The role of every ingredient played in two photon polymerization process is analyzed. A simple, compact and easy to locate experimental scheme is designed to fabricate nanorods in Ormocer. Based on the threshold theory of photon intensity, the lateral size dependences and vertical size dependences of nanorods on laser power and scanning speed are investigated, respectively. Through systematically changing processing parameters, a 136 nm Ormocer suspended nanorod which is beyond diffraction limit resolution is obtained when v = 115 µm/s, P = 58.5 mW. By this means, two photon polymerization techniques show great potential to obtain a limiting resolution of Ormocer. What is more, micro gear, micro chair, photonic crystal and micro annular lens are fabricated in two photon polymerization in order to exhibit excellent mechanical and optical property of Ormocer.
-
A Robust Subpixel-Level Celestial Edge Localization Algorithm for Optical Navigation
Qichang Qiang,Baojun Lin,Yingchun Liu,Xia Lin 한국항공우주학회 2024 International Journal of Aeronautical and Space Sc Vol.25 No.3
The precise localization of celestial edges is crucial for autonomous navigation in deep space. This study proposes a high-precision subpixel-level edge localization method based on coarse and fine detection techniques for interplanetary optical navigation systems. First, pixel-level detection is improved by integrating the 8-neighborhood edge gradient and subdividing the edge width into a single pixel. Second, an accurate subpixel detection method using Zernike moments with the ramp edge model is advanced after analyzing the celestial object’s light intensity distribution and edge intensity. Third, the Otsu algorithm is integrated into the Zernike moments’ method, effectively improving the efficiency of the threshold selection. Finally, experiments conducted on simulated and real images, in comparison with three representative algorithms, show that the proposed algorithm can accurately estimate subpixel edges of celestial bodies while maintaining good robustness.
-
Nonlinear Predictive Control of Active Four-wheel Steering Vehicles
Shuyou Yu,Wenbo Li,Baojun Lin,Yongfu Li,Hong Chen,Hongqing Chu,Jianhua Yu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10
In order to improve the handling stability of active four-wheel steering vehicles, a nonlinear model predictive controller is presented, which can guarantee that the actual sideslip angle and yaw rate can track the ideal sideslip angle and the ideal yaw rate through control of the front and rear wheel angles. A nonlinear static tyre model connected with a linear dynamic model is adopted to describe the vehicle dynamics. Furthermore, the tyre model is replaced by a map in the optimization problem of nonlinear model predictive control. The introduction of maps can reduce the online computational time by a trade-off between the computational burden of CPU and the storage burden of ROM. Simulation results in CarSim indicate that the proposed controller can follow the outputs of the ideal reference model, reduce the computational burden, and improve the handling stability of the active four-wheel steering vehicles effectively.
-
Shuqing Kou,Yan Gao,Yong Zhao,Baojun Lin 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.5
The pulsed laser pre-processing of a notch as the fracture initiation source for the splitting process is the key mechanism of an advanced fracture splitting technology for C70S6 connecting rods. This study investigated the stress field of Nd:YAG pulsed laser grooving, which affects the rapid fracture initiation at the notch root and the controlled crack extension in the critical fracture splitting quality, to improve manufacturing quality. Thermal elastic-plastic incremental theory was applied to build the finite element analysis model of the stress field of pulsed laser grooving for fracture splitting based on the Rotary-Gauss body heat source. The corresponding numerical simulation of the stress field was conducted. The changes and distributions of the stress during pulsed laser grooving were examined, the influence rule of the primary technological parameters on the residual stress was analyzed, and the analysis results were validated by the corresponding cutting experiment. Results showed that the residual stress distribution was concentrated in the Heat-affected zone (HAZ) near the fracture splitting notch, which would cause micro-cracks in the HAZ. The stress state of the notch root in the fracture initiation direction was tensile stress, which was beneficial to the fracture initiation and the crack rapid extension in the subsequent fracture splitting process. However, the uneven distribution of the stress could lead to fracture splitting defects, and thus the residual stress should be lowered to a reasonable range. Decreasing the laser pulse power, increasing the processing speed, and lowering the pulse width can lower the residual stress. Along with the actual production, the reasonable main technological parameters were obtained.
-
Hu Zhiqing,Li Jiaji,Yu Ge,Lin Baojun 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.8
Clustering balls spinning method is a new method for fabricating curved surfaces by clustering rigid balls. It is always one of options to explore forming mechanism by using numerical simulation method that is closer to the real experimental process. In this article, we have adopted a new numerical model with multi-layer rigid balls (MlRB), which is named as MlRB model and more responsive to actual experiments. The model subroutine is developed based on the ABAQUS software. Simulation procedure using MlRB model is introduced, and cross-section, thickness distribution and springback using MlRB model are analyzed and compared to the experimental results and simulated results using previous numerical model with single-layer rigid balls (SlRB), which is named as SlRB model. The results are shown that, curved surface and thickness distribution simulated by MlRB model are closed to experimental results, and springback of curved surface is much less. Furthermore, auxiliary forming region that benefits to make the sheet deformed furtherly is proposed and analyzed. It is indicated that MlRB model is successful to simulate the deformation of the sheet according to the experiment, and it lays the foundation for the optimization of the technology parameters in the future.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
