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H∞ Synchronization of Two Different Discrete-Time Chaotic Systems via a Unified Model
Mei-Qin Liu,Haiyang Chen,Senlin Zhang,Weihua Sheng 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.1
This paper presents some novel synchronization methods for two discrete-time chaotic systems with different time delays, which are transformed into two unified models. First, the H∞ performance of the synchronization error dynamical system between the drive unified model and the response one is analyzed using the linear matrix inequality (LMI) approach. Second, the novel state feedback controllers are established to guarantee H∞ performance for the overall system. The parameters of these controllers are determined by solving the eigenvalue problem (EVP). Most discrete-time chaotic systems with or without time delays can be converted into this unified model, and H∞ synchronization controllers are designed in a unified way. The effectiveness of the proposed design methods are demonstrated by three numerical examples.
Performance of Cone Meter for Measuring Cryogenic Fluid Considering Cavitation
Denghui He,Zhuang Chang,Bofeng Bai,Senlin Chen,Pengcheng Guo 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.1
The performance of the cone meter when measuring the cryogenic fluid was investigated by numerical simulation. The results show that the discharge coefficient and pressure loss coefficient of the cone meter are almost constant when the Reynolds number in the “stable region”. The cryogenic fluids, especially the liquid hydrogen, have wider stable Reynolds number ranges than the water. There is little effect of cavitation on the discharge coefficient and pressure loss coefficient at the initial stage of cavitation. Thus the effect of slight cavitation on the measurement error of the flow rate is small, whose relative error is less than ±0.5% in present cases. This study opens a new avenue for measuring the flow rate of the cryogenic fluid.
Yan Sina,Luo Xingqi,Feng Jianjun,Zhu Guojun,Zhang Lefu,Chen Senlin 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.1
In order to study the influence of inlet gas volume fraction (IGVF) on performance of a gas-liquid centrifugal pump, three-dimensional turbulent flow of a single-stage gas-liquid centrifugal pump has been simulated by using computational fluid dynamics (CFD). Both steady and unsteady simulations have been conducted for different inlet gas volume fraction conditions of the pump. The gas phase distribution, the internal flow field and pressure field of the pump were obtained with inhomogeneous two-fluid model. The result showed that many gas accumulation zones accompanied vortices appears in the impeller as IGVF increases, and surge would occur as IGVF reaches a certain value. The change of IGVF would change the magnitude and direction of the impeller radial force.