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Fu‑an Hua,Hong‑wu Song,Tao Sun,Jian‑ping Li 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3
A model based on inter-diffusion theory was established to predict growth kinetics of the intermetallic compounds (IMCs)formed in roll bonded Al/Cu sheets during annealing process. The model can give good prediction of both IMC layers growthkinetics and element concentration distribution at the interface of roll bonded Cu/Al sheets with different thickness underdifferent annealing conditions with certain roll reduction range. It is revealed that the calculated results of the proposedmodel are depended on the inter-diffusion coefficient of each components, which could be related to the interface bondingstate, i.e., bonding methods or rolling reductions for roll bonding. And there was big difference in inter-diffusion coefficientof Al and Cu matrix under different bonding state, while the inter-diffusion coefficient of IMCs changed slightly.
A new approach to exponential stability analysis of nonlinear systems
Anhua Wan 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1-2
An effective method for analyzing the stability of nonlinear systems is developed. After introducing a novel concept named the pointwise generalized Dahlquist constant for any mapping and presenting its useful properties, we show that the point-wise generalized Dahlquist constant is sufficient for characterizing the exponential stability of nonlinear systems.
Oscillation and asymptotic stability behavior of a third order linear impulsive equation
Anhua Wan,Weihua Mao 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1-2
In this paper, the oscillation and asymptotic stability behavior of a third order linear impulsive equation are investigated. A lemma is presented to deal with the sign relation of the nonoscillatory solutions and their derived functions. By the lemma explicit sufficient conditions are obtained for all solutions either oscillating or asymptotically tending to zero. Two illustrative examples are proposed to demonstrate the effectiveness of the conditions
Anti Crosstalk Ranging Method with Multi Ultrasonic Sensor Based On Chaotic Sequence
Anhua Wang,Yunbo Shi 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.11
Ultrasonic sensor is widely used in robot, automobile, automatic production line and so on, but its detection angle is limited, therefore, multiple ultrasonic sensors are often needed to expand the detection range of distributed structures such as parallel or surround. Multiple ultrasonic probes work at the same time, and very close each other, it will cause crosstalk problems. The chaotic sequence is introduced into the detection signal in the system of ultrasonic receiving and transmitting, it can improve the reliability of detection information and efficiency, realize multi probe synchronously work without crosstalk. Simulation and experimental data show that the system can effectively detect in the range from 0.08 to 4.87 meters, the average error is less than 1.16%, which proves that this method is feasible.
OSCILLATION AND ASYMPTOTIC STABILITY BEHAVIOR OF A THIRD ORDER LINEAR IMPULSIVE EQUATION
WAN, ANHUA,MAO, WEIHUA 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1
In this paper, the oscillation and asymptotic stability behavior of a third order linear impulsive equation are investigated. A lemma is presented to deal with the sign relation of the nonoscillatory solutions and their derived functions. By the lemma explicit sufficient conditions are obtained for all solutions either oscillating or asymptotically tending to zero. Two illustrative examples are proposed to demonstrate the effectiveness of the conditions.
A NEW APPROACH TO EXPONENTIAL STABILITY ANALYSIS OF NONLINEAR SYSTEMS
WAN, ANHUA 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.19 No.1
An effective method for analyzing the stability of nonlinear systems is developed. After introducing a novel concept named the point- wise generalized Dahlquist constant for any mapping and presenting its useful properties, we show that the point-wise generalized Dahlquist constant is sufficient for characterizing the exponential stability of nonlinear systems.
Robust mixed H_2/H_∞ guaranteed cost control of uncertain stochastic neutral systems
Weihua Mao,Feiqi Deng,Anhua Wan 한국전산응용수학회 2012 Journal of applied mathematics & informatics Vol.30 No.5
In this paper, we deal with the robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed-cost control problem involving uncertain neutral stochastic distributed delay systems. More precisely, the aim of this problem is to design a robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed-cost controller such that the close-loop system is stochastic mean-square exponentially stable, and an $H_2$ performance measure upper bound is guaranteed, for a prescribed $H_{\infty}$ attenuation level $\gamma$. Therefore, the fast convergence can be fulfilled and the proposed controller is more appealing in engineering practice. Based on the Lyapunov-Krasovskii functional theory, new delay-dependent sufficient criteria are proposed to guarantee the existence of a desired robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed cost controller, which are derived in terms of linear matrix inequalities (LMIs). Furthermore, the design problem of the optimal robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed cost controller, which minimized an $H_2$ performance measure upper bound, is transformed into a convex optimization problem with LMIs constraints. Finally, two simulation examples illustrate the design procedure and verify the expected control performance.
A Study on Fracture Behavior and Impact Stability of Sintered Rare-earth Permanent Magnets
Li Wei,Li Anhua,Wang Huijie,Dong Shengzhi,Guo Yongquan 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The fracture behavior and mechanical characteristics of sintered rare-earth magnets were investigated. It shows that the fracture behavior and bending strength of the magnets obviously exhibit anisotropy. Sm-Co magnets tend to cleavage fracture in the close-packed (0001) plane or in the (10 11 ) plane. The fracture mechanism of Nd2Fe14B magnet mainly appears to be intergranular fracture. The anisotropy of fracture behavior and mechanical strength of sintered rare-earth magnets is caused mainly by the strong crystal-structure anisotropy and the grain alignment texture. The effects of Nd content, and Pr, Dy substitution on the impact stability of Nd2Fe14B magnets were also reported.
Xiong Peng,Xiong Peng,Anhua Chen,Chao Zhao,Canlong Liu,Y. Frank Chen 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.1
The falling offs of building decorative layers (BDLs) on exterior walls are quite common, especially in Asia, which presents great concerns to human safety and properties. Presently, there is no effective technique to detect the debonding of the exterior finish because debonding are hidden defect. In this study, the debonding defect identification method of building decoration layers via UAV-thermography and deep learning is proposed. Firstly, the temperature field characteristics of debonding defects are tested and analyzed, showing that it is feasible to identify the debonding of BDLs based on UAV. Then, a debonding defect recognition and quantification method combining CenterNet (Point Network) and fuzzy clustering is proposed. Further, the actual area of debonding defect is quantified through the optical imaging principle using the real-time measured distance. Finally, a case study of the old teaching-building inspection is carried out to demonstrate the effectiveness of the proposed method, showing that the proposed model performs well with an accuracy above 90%, which is valuable to the society.