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Multi-type sensor placement and response reconstruction for building structures: Experimental investigations

Earthquake Engineering and Engineering Vibration 2018年第1期17卷 29-46页

作者： Rong-Pan Hu You-Lin Xu sheng zhan Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

Estimation of lateral displacement and acceleration responses is essential to assess safety and serviceability of high-rise buildings under dynamic loadings including earthquake excitations. However, the measurement information from the limited number of sensors installed in a building structure is often insufficient for the complete structural performance assessment. An integrated multi-type sensor placement and response reconstruction method has thus been proposed by the authors to tackle this problem. To validate the feasibility and effectiveness of the proposed method, an experimental investigation using a cantilever beam with multi-type sensors is performed and reported in this paper. The experimental setup is first introduced. The finite element modelling and model updating of the cantilever beam are then performed. The optimal sensor placement for the best response reconstruction is determined by the proposed method based on the updated FE model of the beam. After the sensors are installed on the physical cantilever beam, a number of experiments are carried out. The responses at key locations are reconstructed and compared with the measured ones. The reconstructed responses achieve a good match with the measured ones, manifesting the feasibility and effectiveness of the proposed method. Besides, the proposed method is also examined for the cases of different excitations and unknown excitation, and the results prove the proposed method to be robust and effective. The superiority of the optimized sensor placement scheme is finally demonstrated through comparison with two other different sensor placement schemes： the accelerometer-only scheme and non-optimal sensor placement scheme. The proposed method can be applied to high-rise buildings for seismic performance assessment.

关键词： experimental investigation multi-type sensors inclinometer response reconstruction optimal sensor placement

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General Model of Temperature-dependent Modulus and Yield Strength of Thermoplastic Polymers

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Chinese Journal of Polymer Science 2020年第4期38卷 382-393,I0007页

作者： Ping-Yuan Huang zhan-sheng Guo Jie-Min Feng Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai200072China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200072China

A general model was developed to predict the temperature-dependent modulus and yield strength of different thermoplastic *** model,which depends on only two parameters with clear and specific physical meanings,can describe the temperaturedependent modulus and yield strength of thermoplastic polymers over the full glass transition *** temperature-dependent modulus and yield strength of three thermoplastic polymers were measured by uniaxial tension tests over a temperature range of 243-383 *** predictions showed excellent agreement with the experimental *** analysis of model input parameters showed negligible effect on the present general *** universality of the present general model was further validated,showing excellent agreement with published experimental data on other thermoplastic polymers and their composites.

关键词： Thermoplastics Modulus Yield strength Modeling Glass transition

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Study on the System for Separating Sulfurfrom Flue Gas and Dust

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Journal of Systems Engineering and Electronics 2000年第4期11卷 73-79页

作者： Guo Jinji zhan sheng Chen Hai Xie Xushi Dept. of Applied Mechanics and Engineering Zhongshan UniversityGuangzhou 510275 P. R. China

This paper describes the structure of the system for separating sulfur from flue gas and dust. In the paper, the velocities of turbulent flow and laminar flow inside the tower, the total of liquid membrance, and the additional flow of rotation fogged fluid are calculated, and the separation of rotation air-solid affected by tower is analyzed. The velocity distribution in quasi free vortex area is obtained from experiment. The minimum separated particle diameter is computed. The paper also studies the chemical reactions of flue gas containing sulfide with the dynamic fogged sulfur separating agent and discusses the main factors related to the effect of separating sulfur and dust. At last, the applications of separating sulfur in industrial stove and collecting dust in environmental engineering are introduced.

关键词： Dust Flue gases Laminar flow Liquid membranes Particle size analysis Separation Turbulent flow

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Temperature effect on aerobic denitrification and nitrification

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Journal of Environmental Sciences 2003年第5期15卷 669-673页

作者： XIE Shu guang zhanG Xiao jian WANG zhan sheng Department of Environmental Science and Technology Tsinghua UniversityBeijing 100084China.

Nitrogen loss without organic removal in biofilter was observed and its possible reason was explained. A lower hydraulic loading could improve aerobic denitrification rate. Aerobic denitrification was seriously affected by low temperature(below 10℃). However, nitrification rate remained high when the temperature dropped from 15℃ to 5℃. It seemed the autotrophic biofilm in BAF could alleviate the adverse effect of low temperature.

关键词： aerobic denitrification nitrification biofilter temperature effect

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Pilot plant study on ozonation and biological activated carbon process for drinking water treatment

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Journal of Environmental Sciences 2006年第2期18卷 232-235页

作者： KONG Ling-yu zhanG Xiao-jian WANG zhan-sheng Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

A study on advanced drinking water treatment was conducted in a pilot scale plant taking water from conventional treatment process. Ozonation-biological activated carbon process （O3-BAC） and granular activated carbon process （GAC） were evaluated based on the following parameters： CODMn, UV254, total organic carbon （TOC）, assimilable organic carbon （AOC） and biodegradable dissolved organic carbon （BDOC）. In this test, the average removal rates of CODMn, UV254 and TOC in O3-BAC were 18.2%, 9.0% and 10.2% higher on （AOC） than in GAC, respectively. Ozonation increased 19.3-57.6 μg Acetate-C/L in AOC-P17, 45.6-130.6 μg Acetate-C/L in AOC-NOX and 0.1-0.5 mg/L in BDOC with ozone doses of 2 8 mg/L. The optimum ozone dose for maximum AOC formation was 3 mgO3/L. BAC filtration was effective process to improve biostability.

关键词： ozonation biological activated carbon CODMn UV254 TOC AOC BDOC biostability

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Multi-type sensor placement and response reconstruction for structural health monitoring of long-span suspension bridges

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Science Bulletin 2016年第4期61卷 313-329页

作者： You-Lin Xu Xiao-Hua zhang Songye Zhu sheng zhan Department of Civil and Environmental Engineering The HongKong Polytechnic UniversityHong KongChina College of Civil Engineering Fuzhou UniversityFuzhou 350108China

This study is devoted to the experimental validation of the multi-type sensor placement and response reconstruction method for structural health monitoring of long-span suspension bridges. The method for multi-type sensor placement and response reconstruction is briefly described. A test bed, comprising of a physical model and an updated finite element （P-E） model of a long-span suspension bridge is also concisely introduced. The proposed method is then applied to the test bed; the equation of motion of the test bed subject to ground motion, the objective function for sensor location optimization, the principles for mode selection and multi-type response reconstruction are established. A numerical study using the updated FE model is performed to select the sensor types, numbers, and locations. Subsequently, with the identified sensor locations and some practical considerations, fiber Bragg grating （FBG） sensors, laser displacement transducers, and accelerometers are installed on the physical bridge model. Finally, experimental investigations are conducted to validate the proposed method. The experimental results show that the reconstructed responses using the measured responses from the limited number of multitype sensors agree well with the actual bridge responses. The proposed method is validated to be feasible and effective for the monitoring of structural behavior of longspan suspension bridges.

关键词： Long-span suspension bridges Structural behavior monitoring Multi-type sensorsMulti-type responses Experimental validation

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Synthesis and mesomorphic properties of bent-shaped molecule with low bent-angle central core and long alkylthio tail

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Chinese Chemical Letters 2011年第9期22卷 1111-1114页

作者： Xiao Dong Li Mao sheng zhan Kai Wang School of Material Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China

Two homologous series of bent-shaped molecules composed of low bent-angle naphthalene central core and long alkoxy tail or alkylthio tail, N（1,7）-n-OPIMB and N（1,7）-n-SP1MB （n = 20, 22）, respectively, were synthesized. The mesomorphic properties were investigated by differential scanning calorimetry （DSC）, polarizing optical microscopy （POM） and X-ray diffraction （XRD）. Compared to the direct transition from the isotropic phase to the chiral B4 phase examined in N（1,7）-n-OPIMB, N（1,7）-n-SPIMB exhibited a rare Iso-Ncol-Colh-B4 phase sequence. The combination of the asymmetric low bent-angle 1,7-naphathalene central core and the flexible long alkylthio tail is considered to play an important role in the formation of such a novel phase sequence.

关键词： Bent-shaped Liquid crystal Alkylthio tail Mesomorphic behaviour

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Analysis of delamination in thin film electrodes under galvanostatic and potentiostatic operations with Li-ion diffusion from edge

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Acta Mechanica Sinica 2013年第3期29卷 348-356页

作者： Bo Lu Yi-Cheng Song zhan-sheng Guo Jun-Qian zhang Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Department of Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University

Progressive delamination driven by Li-ion diffusion in elastic disk-like thin film electrodes of Li-ion batteries is modeled based on the cohesive model. Axisymmetric diffusion model is considered under both galvanostatic and potentiostatic operations. The effect of edge diffusion on the delamination process is evaluated. It is found that the diffusion from edge leads to an earlier delamination initiation. The edge effect is significant for active disks with a small aspect ratio, but negligible for the case of large aspect ratio. The edge diffusion is weaker in the potentiostatic operation than in the galvanostatic operation.

关键词： Lithium-ion battery · Thin film electrode · De-lamination · Diffusion

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Geometry,kinematics and evolution of the Tongbai orogenic belt

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Science China Earth Sciences 2006年第8期49卷 828-838页

作者： HUANG Shaoying XU Bei WANG Changqiu zhan sheng DENG Rongjing The Key Laboratory of Orogenic Belts and Crustal Evolution Peking University Ministry of EducationBeijing 100871China

The Tongbai orogenic belt(TOB)is composed of six tectonic *** south to north these units are:Tongbai gneiss rise(TGR);Hongyihe-Luozhuang eclogite belt(HLE);Ma-opo-Hujiazhai igneous rock belt(MHI);Zhoujiawan flysch belt(ZFB);Yangzhuang greenschist belt(YGB);and Dongjiazhuang marble belt(DMB).The geometry and kinematic images of the TOB in-clude:the antiformal structures caused by a later uplift process,the top-to-north ductile shear struc-ture that related to a process that the ultrahigh pressure rocks are brought to surface,the top-to-south ductile shear thrust and the sinistrial shear structures related to a south-north direction compression,and the east-west direction fold structures in the upper *** the view of the multistage subduc-tion-collision orogenic belt,according to the characters of petrology and its distribution,geometry,kinematics and structural chronology in these tectonic units,tectonic evolution of the TOB can be divided into four stages:oceanic crust subduction during 400―300 Ma,continental collision during 270―250 Ma,continental deep subduction and uplift during 250―205 Ma and doming deformation during 200―185 Ma.

关键词： Tongbai geometry kinematics tectonic unit orogenic belt evolution

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Atomic Interferometric Gravitational-Wave Space Observatory(AIGSO)

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Communications in Theoretical Physics 2018年第1期69卷 37-42页

作者： Dong-Feng Gao Jin Wang Ming-sheng zhan State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences-Wuhan National Laboratory for OptoelectronicsWuhan 430071China Center for Cold Atom Physics Chinese Academy of SciencesWuhan 430071China

We propose a space-borne gravitational-wave detection scheme,called atom interferometric gravitationalwave space observatory(AIGSO).It is motivated by the progress in the atomic matter-wave interferometry,which solely utilizes the standing light waves to split,deflect and recombine the atomic *** scheme consists of three drag-free satellites orbiting the *** phase shift of AIGSO is dominated by the Sagnac effect of gravitational-waves,which is proportional to the area enclosed by the a√tom interferometer,the frequency and amplitude of *** scheme has a strain sensitivity<10^(-20)/Hz^(1/2)in the 100 mHz–10 Hz frequency range,which fills in the detection gap between space-based and ground-based laser interferometric ***,our proposed AIGSO can be a good complementary detection scheme to the space-borne laser interferometric schemes,such as *** the current status of relevant technology readiness,we expect our AIGSO to be a promising candidate for the future space-based gravitational-wave detection plan.

关键词： gravitational waves atomic Sagnac interferometer space-borne detector

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