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| 1 | ERA modal identification method for hydraulic structures based on order determination and noise reduction of singular entropy显示文摘Modal parameter has been considered as one of the indices in assessing the working state of hydraulic structures. The method for obtaining the modal parameter indices is crucial for health monitoring of hydraulic structures. Traditionally, model parameters are measured from the prototype dynamic test under the excitation of special equipment. The preparation is time-consuming and the method is difficult to carry out. We propose a method in this paper to denoise, reconstruct, determine the order and identify modal parameters based on singular entropy (SE) of eigenmatrix. It can be used to solve the problem of system eigenmatrix order determination, and to identify the modal order and the characteristics of structures under the working state. Finally, this method is applied to identify the operational modal parameters of Ertan arch dam under different flood discharging states and vibration frequencies of the powerhouse with a two-row placed unit in Lijiaxia hydropower station during the unit halting process. This new method provides a simple way to identify the modal parameters of large-scale hydraulic structures under ambient excitation. | LIAN JiJian LI HuoKun ZHANG JianWei | 2009 | Science China(Technological Sciences)2009，52，2： | 16 |
| 2 | Safety evaluation and the static-dynamic coupling analysis of counter-arched slab in plunge pool显示文摘The stability of plunge pool slab of drainage structure is crucial to energy dissipation,but the working conditions of counter-arched slab are very complex and its stress procedure is considerably nonlinear and coupling.Therefore,a nonlinear static and dynamic coupling method to analyze the counter-arched slab configuration is put forward,which can reflect the coupling of dynamic loads,slab,anchor bars,groundwork and abutment as well as the dynamic procedure of instability.Various nonlinear factors and static-dynamic coupling are taken into consideration,and the working conditions,stress mechanism,dynamic instability procedure and influential instability factors are revealed.The proposed method thus provides a comprehensive safety evaluation method of plunge pool,which further pro-vides an important theoretical basis for engineering design of counter-arched slab in plunge pool. | LIAN JiJian LIU XiZhu MA Bin | 2009 | Science China(Technological Sciences)2009，52，5： | 4 |
| 3 | Similarity law of fluctuating pressure spectrum beneath hydraulic jump显示文摘Similarity law is the conversion rule between model and prototype, on which a lot of research works have been done, with no agreement reached referring to the similarity law of fluctuating pressure fre- quency spectrum. Experimental data of peak frequency and dominant frequency range of fluctuating pressure spectrum beneath hydraulic jump obtained from serial models of scales 1:1, 1:2 and 1:5 are compared. As a result, similarity law of fluctuating pressure spectrum in the strongly rolling area agrees with the gravity law. As peak frequency and dominant frequencies of fluctuating pressures in hydraulic jump, toe and tail are rather low, and the similarity is often misunderstood to be λf = 1. However, the normalized spectrums of fluctuating pressures show that the similarity nearly agrees with the gravity law. | LIAN JiJian WANG JiMin GU JinDe | 2008 | Chinese Science Bulletin2008，53，14： | 3 |
| 4 | Probabilistic analysis for the response of nonlinear base isolation system under the ground excitation induced by high dam flood discharge显示文摘According to theoretical analysis,a general characteristic of the ground vibration induced by high dam flood discharge is that the dominant frequency ranges over several narrow frequency bands,which is verified by observations from the Xiangjiaba Hydropower Station.Nonlinear base isolation is used to reduce the structure vibration under ground excitation and the advantage of the isolation application is that the low-frequency resonance problem does not need to be considered due to its excitation characteristics,which significantly facilitate the isolation design.In order to obtain the response probabilistic distribution of a nonlinear system,the state space split technique is modified.As only a few degrees of freedom are subjected to the random noise,the probabilistic distribution of the response without involving stochastic excitation is represented by theδfunction.Then,the sampling property of theδfunction is employed to reduce the dimension of the Fokker-PlanckKolmogorov(FPK)equation and the low-dimensional FPK equation is solvable with existing methods.Numerical results indicate that the proposed approach is effective and accurate.Moreover,the response probabilistic distributions are more reasonable and scientific than the peak responses calculated by conventional time and frequency domain methods. | Liang Chao Zhang Jinliang Lian Jijian Liu Fang Li Xinyao | 2017 | Earthquake Engineering and Engineering Vibration2017，16，4： | 2 |
| 5 | Eff ect of Cementation on Calcium Carbonate Precipitation of Loose Sand Resulting from Microbial Treatment显示文摘Microbe-induced calcite precipitation is a sustainable improvement technique for sandy soil, which can alter the properties of sand via microbial activity. In this study, we investigated the loose-sand-consolidation eff ect by controlling the injection velocity, bacterial and cementingsolution concentrations, and hold times. The results demonstrate that, as the cyclic batch increases, the utilization rate of the bacterial fl uid increases and both the optical density(OD_(600)) of the bacteria and urease activity decrease. Moreover, it was determined that a 3-h hold time for a 0.5 mol/L cementing solution with a cementing fl uid velocity of 2 mL/min has the greatest bonding eff ect. The fi nal strength of the loose sand with an increase in calcium carbonate content was further discussed. | Yang Tang Jijian Lian Guobin Xu Yue Yan Hongyin Xu | 2017 | Transactions of Tianjin University2017，23，6： | 2 |
| 6 | Short-term optimal operation of Three-gorge and Gezhouba cascade hydropower stations in non-flood season with operation rules from data mining显示文摘 | Chao Ma Jijian Lian Junna Wang | 2013 | Energy Conversion and Management2013，，： | 1 |
| 7 | Bearing capacity and technical advantages of composite bucket foundation of offshore wind turbines显示文摘 | Lian Jijian Sun Liqiang Zhang Jinfeng | | 0，，02： | 1 |
| 8 | Soil reinforcement experiment inside large-scale bucket foundation in muddy soil显示文摘 | Ding Hongyan Li Zengzhi Lian Jijian | | 0，，03： | 1 |
| 9 | Design of large-scale prestressing bucket foundation for offshore wind turbines显示文摘 | Lian Jijian Ding Hongyan Zhang Puyang | | 0，，02： | 1 |
| 10 | Excited Mechanism of Flow-Induced Vibrations of Plate Gate 显示文摘 | YANG Ming LIAN Jijian LIN Jiyong | 1997 | Chinese Journal of Hydrodynamics1997，，4： | 1 |
| 11 | Soil rein- forcement experiment inside large-scale bucket foundationin muddy soil 显示文摘 | Ding Hongyan Li Zengzhi Lian Jijian | 2012 | Transactions of Tianfin University2012，18，3： | 1 |
| 12 | Reservoir operation rules for controlling algal blooms in a tributary to the impoundment of Three Gorges Dam显示文摘 | LIAN Jijian YAO Ye MA Chao | 2014 | Water2014，6，： | 1 |
| 13 | On the four-dimensional lattice spring model for geomechanics显示文摘Recently, a four-dimensional lattice spring model(4D-LSM) was developed to overcome the Poisson's ratio limitation of the classical LSM by introducing the fourth-dimensional spatial interaction. In this work, some aspects of the 4D-LSM on solving problems in geomechanics are investigated, such as the ability to reproduce elastic properties of geomaterials, the capability of solving heterogeneous problems,the accuracy on modelling stress wave propagation, the ability to solve dynamic fracturing and the parallel computational efficiency. Our results indicate that the 4D-LSM is promising to deal with problems in geomechanics. | Gao-Feng Zhao Xiaodong Hu Qin Li Jijian Lian Guowei Ma | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，4： | 0 |
| 14 | A nonlinear viscoelastic model for bed mud transport due to waves and currents显示文摘In estuaries and coasts, mud transport due to waves and tidal currents has an important influence on the shoaling control of harbours and waterways and pollutant dispersion. Based on the investigation of rheologic behaviour, a nonlinear viscoelastic model is proposed. | Jijian Lian Zidan Zhao Qinghe Zhang | 1999 | Chinese Science Bulletin1999，44，17： | 0 |
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