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A decoupling FEM for simulating near-field wave motion in two-phase media
Chen, S.L.,Liao, Z.P.,Chen, J. Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.25 No.2
A decoupling technique for simulating near-field wave motions in two-phase media is introduced in this paper. First, an equivalent but direct weighted residual method is presented in this paper to solve boundary value problems more explicitly. We applied the Green's theorem for integration by parts on the equivalent integral statement of the field governing equations and then introduced the Neumann conditions directly. Using this method and considering the precision requirement in wave motion simulation, a lumped-mass FEM for two-phase media with clear physical concepts and convenient implementation is derived. Then, considering the innate attenuation character of the wave in two-phase media, an attenuation parameter is introduced into Liao's Multi-Transmitting Formula (MTF) to simulate the attenuating outgoing wave in two-phase media. At last, two numerical experiments are presented and the numerical results are compared with the analytical ones demonstrating that the lumped-mass FEM and the generalized MTF introduced in this paper have good precision.
A decoupling FEM for simulating near-field wave motion in two-phase media
S. L. Chen,Z. P. Liao,J. Chen 국제구조공학회 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.25 No.2
A decoupling technique for simulating near-field wave motions in two-phase media is introduced in this paper. First, an equivalent but direct weighted residual method is presented in this paper to solve boundary value problems more explicitly. We applied the Green’s theorem for integration by parts on the equivalent integral statement of the field governing equations and then introduced the Neumann conditions directly. Using this method and considering the precision requirement in wave motion simulation, a lumped-mass FEM for two-phase media with clear physical concepts and convenient implementation is derived. Then, considering the innate attenuation character of the wave in two-phase media, an attenuation parameter is introduced into Liao’s Multi-Transmitting Formula (MTF) to simulate the attenuating outgoing wave in two-phase media. At last, two numerical experiments are presented and the numerical results are compared with the analytical ones demonstrating that the lumped-mass FEM and the generalized MTF introduced in this paper have good precision.
Blast vibration of a large-span high-speed railway tunnel based on microseismic monitoring
Li, Ao,Fang, Qian,Zhang, Dingli,Luo, Jiwei,Hong, Xuefei Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.5
Ground vibration is one of the most undesirable effects induced by blast operation in mountain tunnels, which could cause negative impacts on the residents living nearby and adjacent structures. The ground vibration effects can be well represented by peak particle velocity (PPV) and corner frequency ($f_c$) on the ground. In this research, the PPV and the corner frequency of the mountain surface above the large-span tunnel of the new Badaling tunnel are observed by using the microseismic monitoring technique. A total of 53 sets of monitoring results caused by the blast inside tunnel are recorded. It is found that the measured values of PPV are lower than the allowable value. The measured values of corner frequency are greater than the natural frequencies of the Great Wall, which will not produce resonant vibration of the Great Wall. The vibration effects of associated parameters on the PPV and corner frequency which include blast charge, rock mass condition, and distance from the blast point to mountain surface, are studied by regression analysis. Empirical formulas are proposed to predict the PPV and the corner frequency of the Great Wall and surface structures due to blast, which can be used to determine the suitable blast charge inside the tunnel.
The Identity of Counties after the Decentralization Reform in China
Liao Liao 건국대학교 아시아·디아스포라 연구소 2017 International Journal of Diaspora&Cultural Critici Vol.7 No.2
China has been considered a centralized country for a long period of time. With several reforms over the last 30 years, important powers have been gradually transferred to local levels, particularly to counties. The article analyzes this evolution based on a field study in two provinces, Zhejiang and Sichuan. The hypothesis is that the transfer of initiatives becomes a new way of steering the identities of counties in China. The analysis presented in this article is based on two perspectives: institutional perspective about the financial, administrative, and political reform in China and neo-institutional perspective to examine the identities of counties, especially the role of counties’ actors in territorial development and intergovernmental relations within the provinces.
A design method of preview controller for linear continuous-time systems with multiple input delays
Yonglong Liao,Fucheng Liao 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
This paper studies a preview control problem for a class of linear continuous-time systems with multiple input delays. Firstly, the preview problem is transformed into a regulation one via constructing an augmented error system. Secondly, a variable substitution is given to eliminate the input delays. Then, based on the solution of an algebraic Riccati equation, a controller with delay compensation and preview compensation is obtained. Furthermore, the existence conditions of the preview controller and the asymptotic tracking properties of the closed-loop system are discussed. Finally, a numerical simulation is given to illustrate the effectiveness of the design method.
Design of Preview Controller for Linear Continuous-time Systems with Input Delay
Yonglong Liao,Fucheng Liao 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.3
This paper makes it possible to design a preview controller for linear continuous-time systems with input delay, which expands the preview control theory. An augmented error system is established. And a variable substitution is used to transform the delay preview control system into a delay-free one whose preview controller uses the future value of the augmented state vector. The future value of the augmented state vector is estimated by the information of the current state vector, the control input on the past time window, and the reference signal on the future time window. Under the assumption of zero initial conditions, a simplified controller with both delay compensation and preview compensation is obtained for the original system. In addition, a preview controller with full-order observer is offered. Finally, simulation results are presented to illustrate the effectiveness and robustness of the controller.
Peng Liao,Shi-Qin Hu,Hong Zhang,Liang-Bi Xu,Jing-Zi Liu,Bin He,Shang-Gao Liao,Yong-Jun Li 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.3
In our previous studies, we have shown that thiourea compounds containing phosphate esters have potent antitumor activity and can be used as a novel strategy for the development of antitumor agents. Herein, a series of novel phosphonate thioureas 5–38 have been synthesized, which were fully characterized by 1H NMR, 13C NMR spectrum, elemental analysis. Three human cancer cell lines (Bcap-37, BGC-823, and PC-3) have been used to investigate these compounds’ antitumor activities. After the summarization of the structure–activity relationships, we found that the variation of R, R1, and R2 in these novel phosphonate thioureas contribute to the antitumor activities. All these SAR-guided efforts may lead to novel antitumor drugs in the market in the near future.
Study of Oil-Water Ratio and Flow Rate of MQL Fluid in High Speed Milling of Inconel 718
Yunn-Shiuan Liao,Chin-Hsi Liao,Hsien-Mou Lin 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.2
High speed milling of Inconel 718 by carbide tool aided by MQL of various oil-water ratios and flow rates of the fluid was investigated. Tool wear and cutting force were taken to assess the effectiveness of the fluids. The action of the fluid in machining Inconel 718 under MQL was also studied. EDX analysis of the rake face of the tool shows that the fluid has penetrated into the chiptool interface and works as the diffusion barrier as well. The results reveal that the amounts of fluid penetration and wetting area are essential for effective fluid action. Tool wear and cutting force are found to decrease with increasing flow rate of the fluid irrespective of oil-water ratio. But the improvements are negligible as compared with those resulted from the flow rates of 100 ml/ hr and 60 ml/hr. This can also be confirmed by the little difference of wetting area beyond the flow rate of 60 ml/hr. Based on this study, it is concluded that the most appropriate oil-water ratio and flow rate of the fluid used in MQL in high speed milling of Inconel 718 are 60:40 and 60 ml/hr, respectively.