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Xuyang Wu,Fujun Niu,Qingguo Liang,Guoyu Li 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
Tensile strength is an important but seldom noticed parameter that reveals the constitutive relations of soil. For the loess, the tensile strength can be used to explain earthwork-induced damages such as tension cracks in cut slopes and corresponding slope failures, or natural disasters such as ground fissures. The present study chose an indirect method, particularly the unconfined penetration (UP) test, to measure the tensile strength of remolded loess and undisturbed Q2 and Q3 loess obtained from different districts in China. The results indicated that the tensile strength of the undisturbed loess was primary determined by the void ratio. In addition, multiple correlations were observed between the void ratio and the degree of saturation. The tensile linear stiffness exhibited an exponential increase following an increase in the tensile strength. The mechanism of the tensile-shear coupling strength criterion was proposed. Linear relations between the mechanical parameters were deduced under the tensile-shear coupling condition and were verified by the remolded and undisturbed loess, respectively. Both the unconfined compressive strength and cohesion decreased under the tensile-shear coupling condition. Comparisons with other strength models validated the suitability of the tensile-shear coupling strength criterion for the loess. This study aims to present a more comprehensive understanding on the tensile strength of loess and offer parameter guidance for stability calculations in practical engineering.
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Integrated Design of Event-triggered Control and Mobile Non-collocated SANs for a Diffusion Process
Zhengxian Jiang,Bo Zhuang,Xuyang Lou,Wei Wu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.9
This paper is concerned with the integrated design of event-triggered control and mobile non-collocated sensor and actuator networks for a diffusion process. Firstly, an estimator is designed to estimate the states of the diffusion process and the mobile strategies of the sensors are given. Then, event-triggered control strategies are presented aiming at the benefit of saving the limited network resources. Based on the event-triggering mechanism, the value of estimation states will be sent to the controllers and the mobile actuators will move to the designated positions within the respective spatial domain. Thirdly, by using the Lyapunov functional approach, sufficient conditions are established to guarantee the boundedness of the event-triggered control system. Moreover, the existence of the lower bound of minimum inter-event time is also proved to exclude the Zeno behavior. Finally, a numerical example is presented to demonstrate the effectiveness of the proposed results.
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