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MODEL-BASED DESIGN OF A VARIABLE NOZZLE TURBOCHARGER CONTROLLER
H. G. ZHANG,E. H. WANG,B. Y. FAN,M. G. OUYANG,S. Z. XIA 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.2
Variable Nozzle Turbocharger (VNT) was invented to solve the problem of matching an ordinary turbocharger with an engine. VNT can harness exhaust energy more efficiently, enhance intake airflow response and reduce engine emissions, especially during transient operating conditions. The difficulty of VNT control lies in how to regulate the position of the nozzle at different engine working conditions. The control strategy designed in this study is a combination of a closedloop feedback controller and an open-loop feed-forward controller. The gain-scheduled proportional-integral-derivative (PID)controller was implemented as the feedback controller to overcome the nonlinear characteristic. As it is difficult to tune the parameters of the gain-scheduled PID controller on an engine test bench, system identification was used to identify the plant model properties at different working points for a WP10 diesel engine on the test bench. The PID controller parameters were calculated based on the identified first-order-plus–dead-time (FOPDT) plant model. The joint simulation of the controller and the plant model was performed in Matlab/Simulink. The time-domain and frequency-domain performances of the entire system were evaluated. The designed VNT control system was verified with engine tests. The results indicated that the real boosting pressure traced the target boosting pressure well at different working conditions.
Y. Q. Ouyang(어우양 위친),M. S. Lee(이민식),C. G. Kang(강충길) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
Blank temperature and blank holding force are important parameters affecting formability in deep drawing process. And heat transfer coefficient has the greatest influence to the temperature. This paper, in which use Al-Si coated boron sheet as blank samples, investigated the formability and thinning behavior according to blank holding force in hot deep drawing. A J-STAMP relative computer simulation has been performed to compare with experimental results. In numerical simulation, thermal coefficient and friction coefficient were studied. Relationship between punch load and forming depth according to blank holding force were also obtained and appropriate value of friction coefficient by varying blank holding force has been evaluated in hot deep drawing. The result shows that friction coefficient decreased as blank holding force increased. Furthermore, thinning behavior and equivalent strain were carefully investigated. It shows that when thinning value is lower than 20%, sample is in a safety state without fracture. Fracture occurs when thinning is higher than 29% under the Bf smaller than 30kN, and 26% when Bf is higher than 30kN.
China Spallation Neutron Source: Accelerator Design Iterations and R&D Status
J. Wei,C.-D. Deng,C.-H. Wang,C.-T. Shi,H. Sun,H.-F. Ouyang,H.-M. Qu,H.-Y. Dong,J. Li,J. Zhang,J.-S. Cao,J.-Y. Tang,L. Dong,L.-L. Wang,Q. Qin,Q.-B. Wang,S. Wang,S.-N. Fu,S.-X Fang,T. -G. Xu,W. Kang,Y.- 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The China Spallation Neutron Source (CSNS) is a high-power, accelerator-based project currently under preparation. The accelerator complex consists of an H$^-$ ion source, an H$^-$ linac, a rapid-cycling proton synchrotron, and the transport lines. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments was started on the prototyping of several key components.