http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Feasibility study of ultra-low NOx Gas turbine combustor using the RML combustion concept
Tien Giap Van,Jeong Jae Hwang,Min Kuk Kim,안국영 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12
A new combustion concept, the so called RML, was investigated to validate its application as a gas turbine combustor for combustor outlet temperatures over 1973 K. The feasibility study of the RML combustor was conducted with zero dimensional combustion calculations. The emission characteristics of RQL, LEAN, EGR and RML combustors were compared. The calculation results showed that the RQL combustor has lower NOx emissions than the LEAN at high outlet temperature. NOx emissions of the RML combustor at equivalence ratio of the rich chamber of 2.0 can be reduced by 30 % compared with the EGR combustor, and lower than the RQL combustor at a combustor outlet temperature over 1973 K. However, the CO emissions of the RML combustor were higher than those of the LEAN and EGR combustors. Also, the possibility of applying the RML combustor to gas turbines was discussed considering residence time, equivalence ratio of the rich chamber and recirculation rate. Although further research to design and realize the proposed RML combustor is needed, this study verified that the RML concept can be successfully used in a gas turbine combustor.
Robust Pole Assignment in a Specified Disk
Nguyen, Van-Giap,Nguyen, Tan-Tien,Lee, Gun-You,Kim, Sang-Bong Institute of Control 2000 Transaction on control, automation and systems eng Vol.2 No.2
This paper presents a method to assign robustly the closed loop system's poles in a specified disk by a state feedback for a linear time invariant system with structured or unstructured uncertainties. THe proposed robust design procedure includes two steps. Firstly, the perturbed closed loop matrix $A_{cl p}$ = $A_{cl}$ + Δ$A_{cl}$ is rearranged such that it is a function of the nominal closed loop matrix $A_{cl}$. Hence, we can control the positions of the perturbed closed loop poles by choosing $A_{cl}$ appropriately. Secondly, the feedback control law F that assigns the closed loop poles of the perturbed system in a specified disk is determined from the equation $A_{cl}$ = A + BF. A procedure for finding F is proposed based on partitioning every matrix of the equation $A_{cl}$ = A + BF in the horizontal direction.
( Vu Van Thoi ),( Vu Van Giap ),( Nguyen Huu Uoc ),( Pham Tien Quan ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Lung transplantation has become an increasingly important mode of therapy for patients with a variety of end-stage lung diseases. However, airway complications reduced the post-transplant survival rate. The most common risk factor associated with post-lung transplantation airway complications is anastomotic ischemia and infections. Airway complications include the development of exophytic granulation tissue, bronchial stenosis, broncho malacia, airway fistula, endobronchial infection, and anastomotic dehiscence. The role of bronchoscopy in the diagnosis and management of airway complications is very important. This article reviews the risk factors, describes clinical manifestations, bronchoscopy, and efficacy treatments of airway complications following lung transplantation in Viet Nam through a few clinical successful cases.
Control of Active Suspension System by Using H$\infty$ Theory
Nguyen, Tan-Tien,Nguyen, Van-Giap,Kim, Sang-Bong Institute of Control 2000 Transaction on control, automation and systems eng Vol.2 No.1
This paper presents a control of active suspension for quarter car model with two degree of freedom by using H$\infty$ method. Absolute velocity of car body is measured for feedback. The system parameter variations are treated with multiplicative uncertainty model. Simulation results show that the H$\infty$ control provides good trade-off between ride quality, suspension packaging and road holding constraints. The experiment with a front wheel suspension system was done to verify the simulation results.
Parametric study of a high-performance ammonia-fed SOFC standalone system
Thai-Quyen Quach,Van-Tien Giap,Dong Keun Lee,Israel Torres Pineda,Kook Young Ahn 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
Ammonia-fed solid oxide fuel cell (SOFC) power generation systems are very promising owing to their high efficiency and ease of fuel storage. However, understanding the complexity of fuel cell stacks and systems supplied by ammonia remains challenging. Therefore, it is proposed to investigate the standalone SOFC system to clearly elucidate the behavior of the stack and realize facile implementation. In this study, the stack was modeled and validated using experimental data to confirm its output characteristics. The system efficiency was then calculated under various operating conditions, such as current density, fuel utilization, and stack in/out temperature. The results show that the system efficiency is approximately 54 % and is highly dependent on fuel utilization and current density but not on temperature differences. However, the system can only operate at a temperature difference of 65 °C or higher owing to the effectiveness of the heat exchanger on the fuel side.