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Floquet scattering resonances in two dimensions

Physical Review A 2025年第2期111卷 023328-023328页

作者： Cai-Xia Zhang Shi-Guo Peng Guo-Qing Zhang Hui Yan Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter School of Physics South China Normal University Guangzhou Guangdong 510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for Physics South China Normal University Guangzhou Guangdong 510006 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan Hubei 430071 China Center for Cold Atom Physics Chinese Academy of Sciences Wuhan Hubei 430071 China Research Center for Quantum Physics Huzhou University Huzhou Zhejiang 313000 China

In this work we establish a general scattering theory for two-dimensional quantum systems with periodically modulated interactions. We show that scattering quantities, such as the scattering cross section, effective scattering length, and effective-range parameter, can be defined in a manner analogous to conventional scattering theory, even in the presence of modulation. Unlike systems with static interactions, the incident wave in our setup can be scattered inelastically into different Floquet channels, absorbing or emitting quanta from the modulation field. A family of Floquet resonances is identified, at which universal recurrence relations are derived for the Floquet scattering amplitudes. These relations are equivalent to a discrete Schrödinger equation describing a pointlike source trapped by an effective potential. The resonance mechanism is explained as the coincidence of the point source's energy with the bound states of the effective potential. We discuss the scattering properties both at and near the resonances, finding that the resonance width and the ratio of the inelastic to elastic cross sections can be effectively controlled through the modulation of the interaction. Our results provide a pathway to precisely manipulate many-body interactions in periodically driven quantum systems.

关键词： Schrodinger equation

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DAMAGE DETECTION BASED ON OPTIMIZED INCOMPLETE MODE SHAPE AND FREQUENCY

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Acta Mechanica Solida Sinica 2015年第1期28卷 74-82页

作者： Wei Chen Wenguang Zhao Huizhen Yang Xuquan Chen Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

For the purpose of structural health monitoring, a damage detection method combined with optimum sensor placement is proposed in this paper. The back sequential sensor placement （BSSP） algorithm is introduced to optimize the sensor locations with the aim of maximizing the 2-norm of information matrix, since the EI method is not suitable for optimum sensor placement based on eigenvector sensitivity analysis. Structural damage detection is carried out based on the respective advantages of mode shape and frequency. The optimized incomplete mode shapes yielded from the optimal sensor locations are used to localize structural damage. After the potential damage elements have been preliminarily identified, an iteration scheme is adopted to estimate the damage extent of the potential damage elements based on the changes in the frequency. The effectiveness of this method is demonstrated using a numerical example of a 31-bar truss structure.

关键词： structural damage detection optimum sensor placement sensitivity analysis information matrix

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Weatherability Studies on External Insulation Thermal System of Expanded Polystyrene Board,Polystyrene Granule and Polyurethane Foam

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Journal of Wuhan University of Technology(Materials Science) 2010年第6期25卷 1027-1032页

作者：尹秀琴 Hubei Key Laboratory of Control Structure School of Civil Engineering and MechanicsHuazhong University of Science and Technology

Atmospheric exposure tests including two experimental stages of high temperature-spraying water cycle and heating-refrigeration cycle were carried out on three currently used ETIS of expanded polystyrene（EPS） board,polystyrene granule mortar and polyurethane foam in order to study the weatherablility of external thermal insulation system（ETIS）.The change rules of adhesive strength were hereby studied at different time period of atmospheric exposure *** experimental results show that the adhesive strength of three kinds of ETIS changes a little during high temperature-spraying water cycle,but the adhesive strength of ETIS with EPS board decreases significantly after heating-refrigeration *** lowering rate of adhesive strength with painting finishes is obviously faster than that of tile finishes for ETIS of EPS board during heating-refrigeration *** weatherability of ETIS with EPS board is worse than the other two,and ETIS of polystyrene granule mortar and polyurethane foam are more suitable than ETIS of EPS board in cold area.

关键词： external thermal insulation system EPS board polystyrene granule atmospheric exposure tests adhesive strength

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Optimal arrangement of viscoelastic dampers for seismic control of adjacent shear-type structures

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第1期14卷 47-60页

作者： Xiao HUANG Hong-ping ZHU School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

The optimal arrangement of viscoelastic dampers (VEDs) used to link two adjacent shear-type structures under seismic excitation was investigated. A two-step optimal design method is proposed. First, optimal parameter expressions of the Kelvin model are used to calculate the optimal stiffness and damping coefficient of the VEDs. Then, using the two-step optimal design method, taking the quadratic performance index as the optimization objective, the optimal arrangement of the dampers is determined. General rules about the optimal arrangement of the VEDs were obtained. The results show that the placement of only one damper between two adjacent shear-type structures should be avoided; if more than one damper is used, they should be distributed on the top and lower floors of the structures. Optimization of the number of dampers had little effect on response reduction. The most important factor was the optimization of the placement of the dampers. Through comparative study, for buildings of equal and unequal heights, the optimal parameters of dampers from parametric studies were shown to match the theoretical results for different numbers and placements of dampers. The level of response reduction was shown to be sensitive to the damping coefficient of the dampers.

关键词： Adjacent shear-type structures Viscoelastic damper (VED) Optimal arrangement Seismic response

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Comparative Analysis of Engineering Elements in Five Chinese Junior High School Physics Textbooks

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Science and Education 2025年 1-28页

作者： Zhang, Xue Xiao, Yang Bao, Lei Zhang, Jing Yang, Lan Xiong, Jianwen Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter National Demonstration Center for Experimental Physics Education School of Physics South China Normal University Guangdong Guangzhou 510006 China Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education) South China Normal University Guangdong Guangzhou 510006 China National Research Center for Educational Materials (Elementary and Middle School Physics Materials Research) South China Normal University Guangdong Guangzhou 510006 China Department of Physics The Ohio State University Columbus 43210 OH United States School of Physics and Optoelectronic Engineering Yangtze University Hubei Jingzhou 434023 China

Recent reforms in science education advocate for the integration of engineering practices into K–12 curricula, prompting a need for this integration in each disciplinary science curriculum. This study aims to identify the current status and future directions of incorporating engineering elements in Chinese junior high school physics textbooks, as well as their distribution and representation approaches across different content areas. Utilizing the Framework for Quality K–12 Engineering Education, which encompasses 12 key elements, this study analyzes five junior high school physics textbooks endorsed by the Chinese Ministry of Education. The analysis revealed three areas of features including: (i) The textbooks meet at least half of the 12 engineering elements, yet exhibit variations in the coverage and quantity of engineering-related content;(ii) the distribution of the 12 engineering elements is unbalanced, with two elements being appreciated and four rarely mentioned across nearly all content themes;(iii) regarding the approaches used to address engineering aspects, the implicit approach is dominant (more than 90%). The limited explicit approaches are primarily concentrated on content themes on Acoustic Phenomena and Phase Change, corresponding to only three aspects of engineering elements. The implications for future textbook revisions and teacher professional development are discussed. © This is a U.S. Government work and not under copyright protection in the US;foreign copyright protection may apply 2025.

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Optimal sensor placement for structural response estimation

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Journal of Central South University 2014年第10期21卷 3993-4001页

作者：陈玮赵文光朱宏平陈骏锋 School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

A methodology, termed estimation error minimization(EEM) method, was proposed to determine the optimal number and locations of sensors so as to better estimate the vibration response of the entire structure. Utilizing the limited sensor measurements, the entire structure response can be estimated based on the system equivalent reduction-expansion process(SEREP) method. In order to compare the capability of capturing the structural vibration response with other optimal sensor placement(OSP) methods, the effective independence(EI) method, modal kinetic energy(MKE) method and modal assurance criterion(MAC) method, were also investigated. A statistical criterion, root mean square error(RMSE), was employed to assess the magnitude of the estimation error between the real response and the estimated response. For investigating the effectiveness and accuracy of the above OSP methods, a 31-bar truss structure is introduced as a simulation example. The analysis results show that both the maximum and mean of the RMSE value obtained from the EEM method are smaller than those from other OSP methods, which indicates that the optimal sensor configuration obtained from the EEM method can provide a more accurate estimation of the entire structure response compared with the EI, MKE and MAC methods.

关键词： estimation error minimization(EEM) system equivalent reduction-expansion process(SEREP) optimal sensor placement(OSP) root mean square error(RMSE)

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Performance of viscous fluid dampers coupling adjacent inelastic structures under near-fault earthquakes

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Journal of Central South University 2010年第6期17卷 1336-1343页

作者：阁东东朱宏平张俊兵陈晓强 School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Provincial Key Laboratory of Control Structure Huazhong University of Science and Technology

The behavior of viscous fluid damper applied in coupling structures subjected to near-fault earthquake was *** structural nonlinearity was characterized by Bouc-Wen model and several near-fault ground motions were simulated by the combination of a recorded earthquake(background ground motion) with equivalent velocity pulses that possess near-fault *** parametric studies were carried out to find the appropriate damping *** of viscous fluid dampers were demonstrated by the relationship between the force and displacement,the maximal damper force and *** control performances were demonstrated in terms of the response reductions of adjacent *** results show that the dynamic responses of adjacent structures are mitigated *** damping coefficients of connecting fluid dampers have a small difference,while adjacent structures under different near-fault ground motions with the same peak *** maximum force of damper is about 0.8 MN,and the maximum damper stroke is about ±550 *** viscous fluid dampers can be produced according to the current manufacturing skills.

关键词： nonlinear viscous fluid damper adjacent structure near-fault earthquake seismic response

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Damage Identification in Beam-Type structures Using Pseudo Strain Energy Density and Grey Relation Coefficient

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Transactions of Tianjin University 2010年第2期16卷 96-103页

作者：陈晓强朱宏平张俊兵李林 School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

Based on pseudo strain energy density (PSED) and grey relation coefficient (GRC), an index is proposed to locate the damage of beam-type structures in time-domain. The genetic algorithm (GA) is utilized to identify the structural damage severity of confirmed damaged locations. Furthermore, a systematic damage identification program based on GA is developed on MATLAB platform. ANSYS is employed to conduct the finite element analysis of complicated civil engineering structures, which is embedded with interface technique. The two-step damage identification is verified by a finite element model of Xinxingtang Highway Bridge and a laboratory beam model based on polyvinylidens fluoride (PVDF). The bridge model was constructed with 57 girder segments, and simulated with 58 measurement points. The damaged segments were located accurately by GRC index regardless of damage extents and noise levels. With stiffness reduction factors of detected segments as variables, the GA program evolved for 150 generations in 6 h and identified the damage extent with the maximum errors of 1% and 3% corresponding to the noise to signal ratios of 0 and 5%, respectively. In contrast, the common GA-based method without using GRC index evolved for 600 generations in 24 h, but failed to obtain satisfactory results. In the laboratory test, PVDF patches were used as dynamic strain sensors, and the damage locations were identified due to the fact that GRC indexes of points near damaged elements were smaller than 0.6 while those of others were larger than 0.6. The GA-based damage quantification was also consistent with the value of crack depth in the beam model.

关键词： damage identification strain test data pseudo strain energy density grey relation coefficient genetic algorithm polyvinylidens fluoride

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The regulation constraint modeling and semantic inferring in construction quality checking

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Structural Survey 2013年第5期31卷 387-400页

作者： Hu, Yun Zhong Zhong, Botao Luo, Hanbin Hu, Hai Meng Hubei Key Laboratory of Control Structure Construction Project Management Research Center Huauh Huazhong University of Science and Technology Wuhan China

Purpose: The purpose of this paper is to explore the feasibility that an ontological approach can be applied to formalize the construction regulation constraint knowledge in a computer-interpretable way, for construction quality checking, during construction stage. Design/methodology/approach: The ontological and semantic web technologies are used to model the construction quality constraints knowledge into Axioms/OWL and SWRL rules. Protégé platform is selected to illustrate how the construction quality checking, based on the Axioms/OWL and SWRL rules, is achieved. Findings: The ontology and semantic web technologies can be an alternative way for modeling the construction regulation constraints in a computer-interpretable way, and can be implemented for the regulation-based construction quality checking. Research limitations/implications: The approach is illustrated only with given specific technical constraints examples, the generality and practicality of the approach need further investigation. Originality/value: The paper introduces an ontological and semantic approach to model and formalize the construction regulation constraints for construction quality checking, and proves the feasibility by the case studies. The proposed approach enables the regulations can be understood and retrieved semantically by computers, which facilitates the using of regulation codes. © Emerald Group Publishing Limited.

关键词： Ontology

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A modified Kelvin impact model for pounding simulation of base-isolated building with adjacent structures

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Earthquake Engineering and Engineering Vibration 2009年第3期8卷 433-446页

作者： Ye Kun Li Li Zhu Hongping College of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 China

Base isolation can effectively reduce the seismic forces on a superstructure, particularly in lowto medium-rise buildings. However, under strong near-fault ground motions, pounding may occur at the isolation level between the baseisolated building （BIB） and its surrounding retaining walls. To effectively investigate the behavior of the BIB pounding with adjacent structures, after assessing some commonly used impact models, a modified Kelvin impact model is proposed in this paper. Relevant parameters in the modified Kelvin model are theoretically derived and numerically verified through a simple pounding case. At the same time, inelasticity of the isolated superstructure is introduced in order to accurately evaluate the potential damage to the superstructure caused by the pounding of the BIB with adjacent structures. The reliability of the modified Kelvin impact model is validated through numerical comparisons with other impact models. However, the difference between the numerical results from the various impact analytical models is not significant. Many numerical simulations of BIBs are conducted to investigate the influence of various design parameters and conditions on the peak inter-story drifts and floor accelerations during pounding. It is shown that pounding can substantially increase floor accelerations, especially at the ground floor where impacts occur. Higher modes of vibration are excited during poundings, increasing the inter-story drifts instead of keeping a nearly rigid-body motion of the superstructure. Furthermore, higher ductility demands can be imposed on lower floors of the superstructure. Moreover, impact stiffness seems to play a significant role in the acceleration response at the isolation level and the inter-story drifts of lower floors of the superstructure. Finally, the numerical results show that excessive flexibility of the isolation system used to minimize the floor accelerations may cause the BIB to be more susceptible to pounding under

关键词： structural pounding base-isolation near-fault ground motions Kelvin impact model nonlinear damping

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