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VOC emission caps constrained by air quality targets based on response surface model:A case study in the Pearl River Delta Region,China

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Journal of Environmental Sciences 2023年第1期123卷 430-445页

作者： Ya’nan Hu Bowen Shi Xin Yuan Chuanzeng Zheng Qing’e Sha Yufan Yu Zhijiong Huang Junyu zheng Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511436China Guangdong Polytechnic of Environmental Protection Engineering Guangzhou 528216China

Because of the recent growth in ground-level ozone and increased emission of volatile organic compounds(VOCs),VOC emission control has become a major concern in China.In response,emission caps to control VOC have been stipulated in recent policies,but few of them were constrained by the co-control target of PM_(2.5)and ozone,and discussed the factor that influence the emission cap formulation.Herein,we proposed a framework for quantification of VOC emission caps constrained by targets for PM_(2.5)and ozone via a new response surface modeling(RSM)technique,achieving 50%computational cost savings of the quantification.In the Pearl River Delta(PRD)region,the VOC emission caps constrained by air quality targets varied greatly with the NOxemission reduction level.If control measures in the surrounding areas of the PRD region were not considered,there could be two feasible strategies for VOC emission caps to meet air quality targets(160μg/m^(3)for the maximum 8-hr-average 90th-percentile(MDA8-90%)ozone and 25μg/m^(3)for the annual average of PM_(2.5)):a moderate VOC emission cap with60%NOxemission reductions.If the ozone concentration target were reduced to 155μg/m^(3),deep NOxemission reductions is the only feasible ozone control measure in PRD.Optimization of seasonal VOC emission caps based on the Monte Carlo simulation could allow us to gain higher ozone benefits or greater VOC emission reductions.If VOC emissions were further reduced in autumn,MDA8-90%ozone could be lowered by 0.3-1.5μg/m^(3),equaling the ozone benefits of 10%VOC emission reduction measures.The method for VOC emission cap quantification and optimization proposed in this study could provide scientific guidance for coordinated control of regional PM_(2.5)and O_(3)pollution in China.

关键词： Volatile organic compounds Emission caps Air quality targets Response surface model Monte Carlo(MC)simulations

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A meteorologically adjusted ensemble Kalman filter approach for inversing daily emissions:A case study in the Pearl River Delta,China

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Journal of Environmental Sciences 2022年第4期34卷 233-248页

作者： Guanglin Jia Zhijiong Huang Xiao Tang Jiamin Ou Menghua Lu Yuanqian Xu Zhuangmin Zhong Qing’e Sha Huangjian Wu Chuanzeng Zheng Tao Deng Duohong Chen Min He Junyu zheng School of Environment and Energy South China University of TechnologyUniversity Town CampusGuangzhou 510006China Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511486China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Faculty of Social and Behavioural Sciences Utrecht UniversityUtrechtCH 3584the Netherlands Guangzhou Institute of Tropical and Marine Meteorology China Meteorological AdministrationGuangzhou 510640China State Environmental Protection Key Laboratory of Regional Air Quality Monitoring Guangdong Environmental Monitoring CenterGuangzhou 510308China Department of Environmental Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China

The conventional Ensemble Kalman filter(EnKF),which is now widely used to calibrate emission inventories and to improve air quality simulations,is susceptible to simulation errors of meteorological inputs,making accurate updates of high temporal-resolution emission inventories challenging.In this study,we developed a novel meteorologically adjusted inversion method(MAEInv)based on the EnKF to improve daily emission estimations.The new method combines sensitivity analysis and bias correction to alleviate the inversion biases caused by errors of meteorological inputs.For demonstration,we used the MAEInv to inverse daily carbon monoxide(CO)emissions in the Pearl River Delta(PRD)region,China.In the case study,60%of the total CO simulation biases were associated with sensitive meteorological inputs,which would lead to the overestimation of daily variations of posterior emissions.Using the new inversion method,daily variations of emissions shrank dramatically,with the percentage change decreased by 30%.Also,the total amount of posterior CO emissions estimated by the MAEInv decreased by 14%,indicating that posterior CO emissions might be overestimated using the conventional EnKF.Model evaluations using independent observations revealed that daily CO emissions estimated by MAEInv better reproduce the magnitude and temporal patterns of ambient CO concentration,with a higher correlation coefficient(R,+37.0%)and lower normalized mean bias(NMB,-17.9%).Since errors of meteorological inputs are major sources of simulation biases for both low-reactive and reactive pollutants,the MAEInv is also applicable to improve the daily emission inversions of reactive pollutants.

关键词： Emission inversion Daily emissions Meteorological adjustment Ensemble Kalman filter

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RBF collocation method and stability analysis for phononic crystals

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Applied Mathematics and Mechanics(English Edition) 2016年第5期37卷 627-638页

作者： Chunqiu WEI Zhizhong YAN Hui zheng chuanzeng ZHANG School of Mathematics and Statistics Beijing Institute of Technology Beijing Key Laboratory on MCAACI Beijing Institute of Technology Department of Civil Engineering University of Siegen

The mesh-free radial basis function （RBF） collocation method is explored to calculate band structures of periodic composite structures. The inverse multi-quadric （MQ）, Gaussian, and MQ RBFs are used to test the stability of the RBF collocation method in periodic structures. Much useful information is obtained. Due to the merits of the RBF collocation method, the general form in this paper can easily be applied in the high dimensional problems analysis. The stability is fully discussed with different RBFs. The choice of the shape parameter and the effects of the knot number are presented.

关键词： radial basis function （RBF） phononic crystal （PC） stability

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ANALYSIS OF A CRACK IN A FUNCTIONALLY GRADED STRIP WITH A POWER FORM SHEAR MODULUS

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Acta Mechanica Solida Sinica 2009年第5期22卷 465-473页

作者： Jinju Ma zheng Zhong chuanzeng Zhang School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai 200092 China Department of Civil Engineering University of Siegen D-57068 Siegen Germany

The plane strain problem of a crack in a functionally graded strip with a power form shear modulus is studied. The governing equation in terms of Airy＇s stress function is solved exactly by means of Fourier transform. The mixed boundary problem is then reduced to a system of singular integral equations and is solved numerically to obtain the stress intensity factor at crack-tip. The maximum circumferential stress criterion and the strain energy density criterion are both employed to predict the direction of crack initiation. Numerical examples are given to show the influence of the material gradation models and the crack sizes on the mode-I and mode-II stress intensity factors. The dependence of the critical kink-angle on the crack size is examined and it is found that the crack kink-angle decreases with the increase of the normalized crack length, indicating that a longer crack tends to follow the original crack-line while it is much easier for a shorter crack to deviate from the original crack-line.

关键词： functionally graded material crack stress intensity factors fracture criterion

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Tunable Fluid-Type Metasurface for Wide-Angle and Multifrequency Water-Air Acoustic Transmission

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Research 2021年第1期2021卷 661-674页

作者： Zhandong Huang Shengdong Zhao Yiyuan Zhang Zheren Cai zheng Li Junfeng Xiao Meng Su Qiuquan Guo chuanzeng Zhang Yaozong Pan Xiaobing Cai Yanlin Song Jun Yang Department of Mechanical and Materials Engineering The University of Western OntarioLondonOntarioCanada N6A 5B9 School of Mathematics and Statistics Qingdao UniversityQingdao 266071China Institute of Mechanics for Multifunctional Materials and Structures Qingdao UniversityQingdao 266071China Key Laboratory of Green Printing Institute of ChemistryChinese Academy of Sciences(ICCAS)Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyBeijing National Laboratory for Molecular Sciences(BNLMS)Beijing 100190China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000China Department of Civil Engineering University of SiegenD-57068 SiegenGermany Qingdao Branch of Institute of Acoustics Chinese Academy of SciencesQingdao 266114China

Efficient acoustic communication across the water-air interface remains a great challenge owing to the extreme acoustic impedance mismatch.Few present acoustic metamaterials can be constructed on the free air-water interface for enhancing the acoustic transmission because of the interface instability.Previous strategies overcoming this difficulty were limited in practical usage,as well as the wide-angle and multifrequency acoustic transmission.Here,we report a simple and practical way to obtain the wide-angle and multifrequency water-air acoustic transmission with a tunable fluid-type acoustic metasurface(FAM).The FAM has a transmission enhancement of acoustic energy over 200 times,with a thickness less than the wavelength in water by three orders of magnitude.The FAM can work at an almost arbitrary water-to-air incident angle,and the operating frequencies can be flexibly adjusted.Multifrequency transmissions can be obtained with multilayer FAMs.In experiments,the FAM is demonstrated to be stable enough for practical applications and has the transmission enhancement of over 20 dB for wide frequencies.The transmission enhancement of music signal across the water-air interface was performed to demonstrate the applications in acoustic communications.The FAM will benefit various applications in hydroacoustics and oceanography.

关键词： interface acoustics extreme

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Performance analysis and material distribution optimization for sound barriers using a semianalytical meshless method

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International Journal of Mechanical System Dynamics 2023年第4期3卷 331-344页

作者： Hanqing Liu Fajie Wang chuanzeng Zhang National Engineering Research Center for Intelligent Electrical Vehicle Power System College of Mechanical and Electrical EngineeringQingdao UniversityQingdaoChina Department of Civil Engineering University of SiegenSiegenGermany

With the increase in car ownership,traffic noise pollution has increased considerably and is one of the most severe types of noise pollution that affects living standards.Noise reduction by sound barriers is a common protective measure used in this country and abroad.The acoustic performance of a sound barrier is highly dependent on its shape and material.In this paper,a semianalytical meshless Burton-Miller‐type singular boundary method is proposed to analyze the acoustic performance of various shapes of sound barriers,and the distribution of sound‐absorbing materials on the surface of sound barriers is optimized by combining a solid isotropic material with a penalization method.The acoustic effect of the sound‐absorbing material is simplified as the acoustical impedance boundary condition.The objective of optimization is to minimize the sound pressure in a given reference plane.The volume of the sound‐absorbing material is used as a constraint.The density of the nodes covered with the sound‐absorbing material is used as the design variable.The method of moving asymptotes was used to update the design variables.This model completely avoids the mesh discretization process in the finite element method and requires only boundary nodes.In addition,the approach also does not require the singular integral calculation in the boundary element method.The method is illustrated and validated using numerical examples to demonstrate its accuracy and efficiency.

关键词： sound barrier acoustic analysis material distribution optimization semianalytical meshless method

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A comparative study of wave localization in locally resonant Thue–Morse, Rudin–Shapiro and Period-Doubling aperiodic structures

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Acta Mechanica Solida Sinica 2017年第3期30卷 271-284页

作者： Zhizhong Yan Yangyang Wang chuanzeng Zhang School of Mathematics and Statistics Beijing Institute of Technology Department of Civil Engineering University of Siegen

The localization characteristics of the in-plane elastic waves in locally resonant aperiodic phononic crystals are examined in this study. In particular, the phononic crystals generated according to the Thue-Morse, Rudin-Shapiro and Period-Doubling sequences are theoretically investigated by using the extended transfer matrix method. For comparison, the binary and ternary locally resonant systems are considered, and their band structures are characterized by using the localization factors. Moreover, the influences of structural arrangement, material combination, incidence angle, number of components, length ratio, and random disorder on the band structures are also discussed. Some novel and interesting phenomena are observed and discussed.

关键词： Phononic crystals Aperiodicity Wave localization Localization factor Transfer matrix method

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Band structures of elastic SH waves in nanoscale multi-layered functionally graded phononic crystals with/without nonlocal interface imperfections by using a local RBF collocation method

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Acta Mechanica Solida Sinica 2017年第4期30卷 390-403页

作者： Zhizhong Yan Chunqiu Wei chuanzeng Zhang School of Mathematics and Statistics Beijing Institute of Technology Beijing Key Laboratory on MCAACI Beijing Institute of Technology Chair of Structural Mechanics Department of Civil EngineeringUniversity of Siegen

A meshless radial basis function （RBF） collocation method based on the Eringen nonlocal elasticity theory is developed to calculate the band structures of ternary and quaternary nanoscale multi-layered phononic crystals （PNCs） with functionally graded （FG） interlayers. Detailed calculations are performed for anti-plane transverse waves propagating in such PNCs. The influences of FG and homogeneous interlayers, component number, nonlocal interface imperfections and nanoscale size on cut-off frequency and band structures are investigated in detail. Numerical results show that these factors have significant effects on band structures at the macroscopic and microscopic scales.

关键词： Multi-layered phononic crystals Functionally graded interlayers Nanoscale Nonlocal elasticity theory Radial basis functions

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Band structures of transverse waves in nanoscale multilayered phononic crystals with nonlocal interface imperfections by using the radial basis function method

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Acta Mechanica Sinica 2017年第2期33卷 415-428页

作者： Zhizhong Yan Chunqiu Wei chuanzeng Zhang School of Mathematics and Statistics Beijing Institute of Technology Beijing 100081 China Beijing Key Laboratory on MCAACI Beijing Institute of Technology Beijing 100081 China Department of Civil Engineering University of Siegen Siegen 57068 Germany

A radial basis function collocation method based on the nonlocal elastic continuum theory is developed to compute the band structures of nanoscale multilayered phononic crystals. The effects of nonlocal imperfect interfaces on band structures of transverse waves propagating obliquely or vertically in the system are studied. The correctness of the present method is verified by comparing the numerical results with those obtained by applying the transfer matrix method in the case of nonlocal perfect interface. Furthermore, the influences of the nanoscale size, the impedance ratio and the incident angle on the cut-off frequency and band structures are investigated and discussed in detail. Numerical results show that the nonlocal interface imperfections have significant effects on the band structures in the macroscopic and microscopic scale.

关键词： Radial basis function Phononic crystal Nanoscale Band structure Nonlocal imperfect interface

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Crack nucleation and propagation simulation in brittle two-phase perforated/particulate composites by a phase field model

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Acta Mechanica Sinica 2020年第2期36卷 493-512页

作者： Xingxue Lu Yuliang Hou Ying Tie Cheng Li chuanzeng Zhang School of Mechanical Engineering Zhengzhou UniversityZhengzhou 450001China Department of Civil Engineering University of Siegen57076 SiegenGermany

Fracture is a very common failure mode of the composite materials,which seriously affects the reliability and service-life of composite materials.Therefore,the study of the fracture behavior of the composite materials is of great significance and necessity,which demands an accurate and efficient numerical tool in general cases because of the complexity of the arising boundary-value or initial-boundary value problems.In this paper,a phase field model is adopted and applied for the numerical simulation of the crack nucleation and propagation in brittle linear elastic two-phase perforated/particulate composites under a quasi-static tensile loading.The phase field model can well describe the initiation,propagation and coalescence of the cracks without assuming the existence and the geometry of the initial cracks in advance.Its numerical implementation is realized within the framework of the finite element method(FEM).The accuracy and the efficiency of the present phase field model are verified by the available reference results in literature.In the numerical examples,we first study and discuss the influences of the hole/particle size on the crack propagation trajectory and the force-displacement curve.Then,the effects of the hole/particle shape on the crack initiation and propagation are investigated.Furthermore,numerical examples are presented and discussed to show the influences of the hole/particle location on the crack initiation and propagation characteristics.It will be demonstrated that the present phase field model is an efficient tool for the numerical simulation of the crack initiation and propagation problems in brittle two-phase composite materials,and the corresponding results may play an important role in predicting and preventing possible hazardous crack initiation and propagation in engineering applications.

关键词： Brittle fracture Phase field model Perforated/particulate composites Crack nucleation and propagation Finite element method

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