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RISS 인기검색어
- 검색키워드
- 저자 : Yu Yannan (검색결과 4 건)
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Optimal design of main girder structure of bridge crane based on equal life concept driven by data
Yannan Yu,Zhiping Liu,Yao Lu,Peng Zhang,Hui Liu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.9
In traditional structural crane design, the fatigue strength of the structure is qualitatively evaluated, only depending on the steel type, working level and joint form, which leads to the excessive service life of some parts of the existing main girder structure, resulting in a waste of industrial resources and manufacturing costs. Based on the concept of equal life design, this paper obtained the service information of the crane in the scheduled inspection period through the rapid prediction method of "field collection+machine learning." Combined with the bearing capacity evaluation method and the fatigue life assessment method of "S-N curve+ fracture mechanics," a nonlinear mixed integer equal life optimization model of crane girder structure was established, and the multi-specular reflection optimization algorithm was used to optimize the life distribution at different positions and overall weight of the main girder. The structural design parameters of the crane main girder which meet the bearing capacity and have the characteristics of "equal life+lightweight" were obtained. The performance of the optimized main girder structure was verified by finite element simulation. The results show that this method can realize the quantitative control of the life distribution of each position of the crane main girder structure and the lightweight design of the whole structure, and provides a scientific reference for the equal life and lightweight design of large construction machinery products.
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Yannan Bi,Zhipeng Shen,Qun Wang,Haomiao Yu,Chen Guo 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.12
This article investigates the adaptive tracking control problem for the marine surface vessels (MSVs) with unknown uncertainties and multiple constraints. Firstly, a novel prescribed performance-based time-varying asystematic barrier Lyapunov function (PP-TABLF) is proposed to control the MSVs to navigate in a variable narrow waterway and to improve the transient performance of MSVs. Secondly, the predictor-based radial basis function neural networks (P-RBFNNs) are developed to approximate the system uncertainties and external disturbances. Specifically, the tracking errors of the RBFNNs are estimated in advance, and the prediction errors are utilized to update the RBFNNs and improve the estimation precision. The command filter and the idea of the recursive sliding mode are integrated with the control law to limit the amplitude of the virtual control signals and to reduce the computational burden. With the proposed control scheme, tracking errors will not override the prescribed performance ranges, and the control force will not be violated in the presence of total unknown uncertainties. Finally, the semi-global uniformly ultimate boundedness of the system is guaranteed by the proposed control scheme, and the simulation results are given to further demonstrate the effectiveness of the proposed approach.
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Improved Model Predictive Control for H-bridge Cascaded STATCOM
Xu Rong,Yu Yong,Wu Jian,Yang Rongfeng,Xu Dianguo,Chen He,Yu Yannan,Ni Ronggang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
H-bridge cascaded static synchronous compensator (STATCOM) is often used to compensate the harmonic and reactive current derived from non-linear load. In order to improve the performance of STATCOM, an improved model predictive control (MPC) method is put forward in this paper. In the proposed MPC, the difference equations which are derived from the transfer functions of controlling variables and controlled variables in STATCOM are used as the predictive control model, the error between the output of STATCOM and predictive model is used to design feedback correction controller and rolling optimization controller. Meanwhile, the introduced repetitive controller is used to eliminate the inherent steady error. The actual H-bridge cascaded STATCOM is constructed and a series of verification tests are executed. The experimental results prove that the output voltage and current of H-bridge cascaded STATCOM with the proposed MPC have smaller distortion and better sinusoidal shape than those of the traditional Proportion Integral (PI) control. Moreover, the performance of H-bridge cascaded STATCOM is great in high power experiment.
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Research on fatigue remaining life of structures for a dynamic lifting process of a bridge crane
Chenggang Li,Qisong Qi,Qing Dong,Yannan Yu,Yu Fan 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
A conventional quasi-static load method causes small stress amplitude and less stress change times when calculating the stress change of crane structures, leading to inaccurate prediction results of the structural fatigue life of the crane. Thus, by investigating the dynamic impact of the crane in the lifting process, the dynamic model of the lifting process was constructed in this study to explore the load variation of a crane structure. A fatigue life prediction method considering the lifting impact effect is proposed to analyze the fatigue life of structures. The calculation results indicate that the lifting impact process increases the number of stress cycles in structures, which has a negative impact on the structural fatigue life. Therefore, determining the dynamic response relationship between the lifting impact effect and the fatigue life of a crane structure can help improve the safety of this structure.
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