朱宏平
博士研究生 教授
华中科技大学 土木工程与力学学院
土木工程结构数值计算方法与应用、振动分析与控制、损伤检测与健康评估等
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- 姓名:朱宏平
- 目前身份:在职研究人员
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 优秀教师/优秀教育工作者, 教育部“新世纪优秀人才支持计划”入选者
- 职称:高级-教授
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学科领域:
土木建筑结构
- 研究兴趣:土木工程结构数值计算方法与应用、振动分析与控制、损伤检测与健康评估等
朱宏平,男、1965年出生于湖北省武汉市新洲区,二级教授、博士生导师;国家杰出青年科学基金获得者、享受国务院政府特殊津贴。
1988年于华中理工大学获建筑工程专业学士学位,1992年于华中理工大学获结构工程专业硕士学位,1995年于华中理工大学获结构工程工学博士学位,1996—1997年在香港科技大学作博士后,1997—1998年在日本京都大学从事博士后研究,1998年华中理工大学土木建筑学院副院长、副教授,1999—2001年在Asian Institute of Technology任副教授,曾于2002年—2003年两次到香港理工大学作高级访问学者,2000年聘为华中科技大学教授,2001年聘为博士生导师。
现为控制结构湖北省重点实验室主任、武汉华中科大土木工程质量检测中心主任、土木工程湖北省重点学科学术带头人、硅酸盐建筑材料国家重点实验室学术委员会委员、桥梁结构安全与健康湖北省重点实验室学术委员会委员、中交集团桥隧技术重点实验室学术委员会委员、中国建筑学会结构计算理论与工程应用专业委员会副主任委员、中国振动工程学会结构抗振控制与健康监测专业委员会委员、中国土木工程学会防震减灾工程技术推广委员会委员、中国建筑学会抗震加固改造技术专委会委副主任委员、中国力学学会结构工程专委会委员、高等学校土建学科土木工程专业指导委员会委员、湖北省力学学会常务理事、湖北省建设教育协会副会长暨湖北省高等建设教育专家委员会主任委员、湖北省土木建筑工程学会结构计算分会副主任委员、武汉市建设委员会科技咨询专家、美国混凝土材料学会(ACI)会员。《土木工程与管理学报》常务副主编、及J. of Service Science and Management、《振动工程学报》、《振动与冲击》、《交通科技》编委。
长期以来从事土木工程结构振动分析与隔震控制、损伤检测与健康评估、以及雷电探测与定位等方面的研究工作,主持完成了1项国家杰出青年科学基金、5项国家自然科学基金面上项目、1项十一五国家科技支撑计划课题、1项教育部新世纪优秀人才计划项目及多项重要的关系到国家和地方经济发展的横向科研项目,现正主持1项国家973课题、1项国家自然科学基金国际合作(港澳台)基金、1项国家自然科学基金面上项目以及若干重要的工程项目等。出版专著1部、发表三大索引检索论文200余篇,其中SCI检索论文超过50篇,获得授权专利5项。作为负责人完成的项目获2014年湖北省科技进步一等奖、2010年湖北省自然科学一等奖、2006年湖北省科技进步一等奖、2007年中国高校自然科学二等奖;作为主要参加者完成的项目获2014年国家科技进步二等奖、2009年和2010湖北省科技进步一等奖各1项、2011年和1996年教育部科技进步一等奖和三等奖各1项。研究成果还曾获湖北省优秀博士论文奖(1998年)以及中国侨联第二届科技创新人才奖(2007年)等。
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朱宏平, Y.L. Xu†, Hongping Zhu‡, J. ChenS‡, †
Structural Engineering and Mechanics, Vol. 18, No.6 (2004) 709-729,-0001,():
-1年11月30日
This paper presents numerical and experimental investigations on damage detection of mono-coupled multistory buildings using natural frequency as only diagnostic parameter. Frequency equation of a mono-coupled multistory building is first derived using the transfer matrix method. Closed-form sensitivity equation is established to relate the relative change in the stiffness of each story to the relative changes in the natural frequencies of the building. Damage detection is then performed using the sensitivity equation with its special features and minimizing the norm of an objective function with an inequality constraint. Numerical and experimental investigations are finally conducted on a mono-coupled 3-story building model as an application of the proposed algorithm, in which the influence of modeling error on the degree of accuracy of damage detection is discussed. A mono-coupled 10-story building is further used to examine the capability of the proposed algorithm against measurement noise and incomplete measured natural frequencies. The results obtained demonstrate that changes in story stiffness can be satisfactorily detected, located, and quantified if all sensitive natural frequencies to damaged stories are available. The proposed damage detection algorithm is not sensitive to measurement noise and modeling error.
damage detection, mono-coupled multistory building, natural frequency.,
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【期刊论文】DAMAGE DETECTION IN BUILDINGS USING A TWO-STAGE SENSITIVITY-BASED METHOD FROM MODAL TEST DATA*
朱宏平, Zhu Hongping, Chen Xiaozhen, Chen Chuanyao
Acta MECHANICA SOLIDA Sinica 2005. **.** (2003-258F),-0001,():
-1年11月30日
Many multi-story or highrise buildings consisting of a number of identical stories are usually considered as periodic spring-mass systems. The general expressions of natural frequencies, mode shapes, slopes and curvatures of mode shapes of periodic spring-mass system by utilizing the periodic structure theory are derived in the paper, moreover, the sensitivities of these mode parameters with respect to structural damages, which do not depend on physical parameters of the original structures, are obtained. Based on the sensitivity analysis of these mode parameters, a two-stage method is proposed to localize and quantify damages of multi-story or highrise buildings. The slopes and curvatures of mode shapes, which are highly sensitive to local damages, are used to localize the damages, subsequently, the limited measured natural frequencies, which have a better accuracy than the other mode parameters, are used to quantify the extent of damages within the potential damaged locations. The experimental results of a 3-storey experimental building demonstrate that the single or multiple damages of buildings, either slight or severe, can be correctly localized by using only the slope or curvature of mode shape in one of the lower modes, in which the change of natural frequency is the largest, and can be accurately quantified by the limited measured natural frequencies with noise pollution.
damage localization, damage quantification, sensitivity, modal test data
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【期刊论文】Structural damage identification using test static data based on the grey system theory*
朱宏平, CHEN Xiao-zhen#, ZHU Hong-ping, CHEN Chuan-yao
Chen et al./J Zhejiang Univ SCI 2004 (): 001~008,-0001,():
-1年11月30日
A new structural damage identification method using limited test static displacement based on the grey system theory is proposed in this paper. The grey relation coefficient of displacement curvature is defined and used to locate damage in the structure, and an iterative estimation scheme for solving nonlinear optimization programming problems based on the quadratic programming technique is used to identify the damage magnitude. A numerical example of a cantilever beam with single or multiple damages is used to examine the capability of the proposed grey-theory-based method to localize and identify damages. The factors of measurement noise and incomplete test data are also discussed. The numerical results showed that the damage in the structure can be localized correctly through using the grey-related coefficient of displacement curvature, and the damage magnitude can be identified with a high degree of accuracy, regardless of the number of measured displacement nodes. This proposed method only requires limited static test data, which is easily available in practice, and has wide applications in structural damage detection.
Damage identification, Grey relation coefficient, Static test data
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【期刊论文】利用振动模态测量值和神经网络方法的结构损伤识别研究
朱宏平, 千力
计算力学学报,22(2):193~196,-0001,():
-1年11月30日
提出了一种基于模态测量参数和神经网络的结构损伤检测方法,建造了两种输入方式的BP神经网络,即自振频率以及结合自振频率与振型,并讨论了不同数量的输入信息对结构损伤检测精度和计算效率的影响。证明了输入的参数越多,神经网络就越聪明,训练的收敛速度越快;以及在保证一定的测量精度的情况下,基于频率与振型的损伤识别结果要好于基于频率的检测结果。最后,通过对3层框架模型的4种损伤工况下的结构损伤检测结果的分析,认为利用模态测量参数和神经网络方法能够准确地识别结构损伤的位置,而且能较精确地识别结构损伤的大小。
结构损伤检测, 振动模态, 神经网络
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【期刊论文】Estimation of structural modal parameters by Fourier Transform with an optimal window
朱宏平, ZHU Hong-ping, WAN Xin-hua
Journal of Harbin Institute of Technology (New Series) Vol. No.2006,-0001,():
-1年11月30日
An adaptive Fourier Transform (FT) with an optimal window has been proposed for the time-frequency analysis of nonstationary time series. The adaptive optimal window length has been determined by minimizing MSE. The method allows a good estimation of both frequency and amplitude of the spectrum and can be easily applied to the general case of time-varying signals. The evaluation of the proposed approach has been performed on measured time-varying signals from a suspension bridge model and a steel frame model whose data have the typical non-stationary characteristics. The performance of the method has been evaluated by comparing the analyzed modal parameters to the ones from the classic Short-time Fourier Transform (SFT) technique and the calculated values obtained from the finite element model. The numerical results show that the proposed approach can overcome some of the difficulties encountered in the classic Fourier transform technique and can achieve higher computation accuracy.
short-time Fourier Transform, optimal window length, modal parameters, engineering structures
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朱宏平, H.P. Zhu a, Y.L. Xu b
Journal of Sound and Vibration 285 (2005) 365-390,-0001,():
-1年11月30日
A sensitivity-based method for localization and assessment of damage in mono-coupled periodic structures is presented in this paper, in which slopes and curvatures of mode shapes are used to localize damage, and natural frequencies are then utilized to quantify the damage. The expressions of sensitivity coefficients of mode shapes, slopes, and curvatures of a mono-coupled periodic system are first derived in terms of receptances of periodic element. A mono-coupled periodic spring-mass system with 10 degrees of freedom is used to carry out a sensitivity study to compare the sensitivities of natural frequencies, mode shapes, slopes, and curvatures to damage. The results show that the sensitivities of these modal parameters in a mono-coupled periodic structure do not depend on the structural parameters, and therefore there is no need for a prior analytical model of the structure. The study also demonstrates that among these modal parameters, curvatures of modal shapes are most sensitive but slopes of mode shapes seem to be more indicative of damage location. A 20-element mono-coupled periodic spring-mass system is adopted to demonstrate the capacity of the proposed method to localize and quantify damages in the mono-coupled periodic system. Finally, a 3-storey near mono-coupled periodic experimental building is used to verify the actual application of the proposed method in consideration of the influence of measurement noise and nonperfect periodicity of actual engineering structures. Numerical and experimental results illustrate that only using a few lower modes with or without noise pollution can accurately detect damages in a mono-coupled periodic or a near mono-coupled periodic structure, either single or multiple damage locations and slight or severe damages.
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【期刊论文】Optimum parameters of Maxwell model-defined dampers used to link adjacent structures
朱宏平, H.P. Zhu a, Y.L. Xu b, *
Journal of Sound and Vibration 279 (2005) 253-274,-0001,():
-1年11月30日
The analytical formulas for determining optimum parameters of Maxwell model-defined fluid dampers used to link two adjacent structures are derived in this paper using the principle of minimizing the averaged vibration energy of either the primary structure or the two adjacent structures under a white-noise ground excitation. Each structure is modelled as a single-degree-of-freedom system, which is connected to the other structure through a Maxwell model-defined fluid damper. The derived formulas explicitly express the optimum parameters of the fluid damper, ies the relaxation time and the damping coefficient at zero frequency, as the functions of the frequency and mass ratios of two adjacent structures. The dynamic analysis shows that the fluid damper of optimum parameters can significantly reduce the dynamic responses of most adjacent structures under the white-noise ground excitation. The fluid damper of optimum parameters is then applied to the adjacent structures subjected to either a filtered white-noise ground excitation or the El Centro 1940 NS ground excitation. The results demonstrate that the fluid damper of optimum parameters derived based on the white-noise ground excitation is also beneficial to reduce the responses of the adjacent structures under the filtered white-noise ground excitation and the El Centro ground excitation.
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【期刊论文】Damage Identification in Beam Structures Based on Mechanical Impedance Characters
朱宏平, WANG Dansheng & ZHU Hongping
,-0001,():
-1年11月30日
It is very important to analyze the vibration characters and to identify the damage of cracked structures. In this paper, the effects of a transverse surface crack on mechanical impedance of simple supported cracked beams are investigated. A method for damage identification based on mechanical impedance characters is proposed in this paper, which makes use of the driving-point mechanical impedance characteristics of the cracked beams stimulated by harmonic force. The proposed impedance method is used to characterize the local discontinuity on account of cracks, and a rotational spring model is proposed to model the crack. Subsequently, the proposed method is verified by a numerical example of a simply supported beam. Combined with the information of first resonance frequencies, the proposed method can identify the presence of the crack and localize the crack, and the disciplinarian of driving-point impedance change is investigated when the depth of cracks is varying, and the extent to the crack damage is qualitatively identified.
mechanical impedance, rotational spring model, cracked beam, damage identification.,
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朱宏平, 何波
工程力学,2003,20(3):109~114,-0001,():
-1年11月30日
介绍了一种基于敏感性分析的周期结构损伤检测方法的基本原理,首先得到了具有单一损伤的周期结构固有频率的一般表达式,并运用在不同单元出现损伤时的第一阶自振频率的近似值形成特征值敏感性矩阵:然后通过求解一组基于上述特征值敏感性矩阵的线性方程,识别出结构损伤位置和大小:针对大型结构可能出现多处损伤的特点,文章最后还介绍了一种方法,它不仅能改善计算精度,而且能提高计算效率。理论分析和数值结果表明周期结构自振频率对不同位置损伤的敏感性仅仅与结构单元数目和损伤位置有关,基于敏感性分析的方法能够准确识别出结构的损伤。
损伤检测, 周期结构, 自振频率, 敏感性分析
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朱宏平, 张源
力学学报,2003,35(1):111~116,-0001,():
-1年11月30日
描述基于人工神经网络的结构损伤检测的基本步骤以及该方法在实际5层钢框架结构损伤检测上的应用。提出了一种改进的BP神经网络方法,它能够解决传统BP神经网络在实际应用中存在的两个问题:收敛速度慢并存在局部极小。其基本思想是引入动态白适应算子加速传统BP算法的梯度下降速度,从而提高运算速度,通过自调节保证学习过程中每一时刻具有较大的sinoid函数值,从而可以避免局部极小数值仿真结果表明基于该自适应神经网络的结构损伤检测方法具有强的鲁棒性,而且与传统的BP神经网络相比,不仅提高了计算速度,并且具有很高的精度。最后,实例的应用也证明了该方法的有效性。
神经网络, 改进的BP算法, 自适应算子, 损伤检测, 鲁棒性
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