林家浩
结构动力学及相关领域
个性化签名
- 姓名:林家浩
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师
- 职称:-
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学科领域:
土木建筑结构
- 研究兴趣:结构动力学及相关领域
林家浩在结构动力学及相关领域的主要研究成果有:
1)创建了随机振动虚拟激励算法系列;对平稳/非平稳,完全相干/部分相干,均匀调制/非均匀调制等各种随机激励情况以全新思路对传统算法进行更新。该高效精确算法打破了束缚随机振动理论工程应用的计算效率低下瓶颈,在许多大型桥梁,水坝等国家级工程上得到应用。分析规模和难度远远超过了国外同行已达到的程度。林指导博士生孙东科与香港理工大学合作在国际上首先实现了大跨度悬索桥的三维气动弹性耦合颤振-抖振分析,并获评2002年全国百篇优秀博士论文。林近年来在三十几所国际著名大学和工程公司发表学术报告,列举大量工程实例表明中国工程师和学者在多个领域改用虚拟激励法而取得的突破性进展,令国外同行瞩目。美国CRC出版社《振动与冲击手册》(Vibration and Shock Handbook,2005)第30章重点介绍了虚拟激励法的原理和应用。
2)林早年从“避开共振”的工程普遍追求出发提出了受“频率禁区”约束的结构优化命题及其数学表达,并针对传统优化准则法收敛不稳定的缺点,研究出双因子迭代算法,在计算效率和稳定性上超过了当时在该领域最有影响的其它方法。论文于1981年在重要国际大会上宣读,并于同年应邀在斯坦福大学作了学术报告。后在国际刊物发表。上述工作在飞行器、车辆等优化设计中被同行成功应用,证明行之有效。这是钱令希领导的结构优化设计系统研究工作的一个组成部分,获国家教委科技进步一等奖和国家自然科学二等奖。
3)唐山大地震后,结构弹塑性地震反应研究引起高度重视。林在刚度退化多自由度结构弹塑性地震分析上取得突破。在1978年全国第一届地震工程会议上发表了这成果并无偿公开全部计算机源程序和详细说明,推动了相关研究。获辽宁省科技进步二等奖。八十年代初,国内开始大量兴建复杂形状高层建筑。针对日益尖锐的规范和新颖设计间的矛盾,林推导出复杂体型结构三维反应谱抗震方法,并在自主版权JIGFEX程序平台上领导编制了复杂高层结构抗震分析程序,经多个设计院及国家建研院反复考核后,被收入《建筑抗震设计手册》向全国设计部门推广。1974年起,他与程耿东、钟万勰一起参与国家《动力机器基础设计规范》的修订工作,修正了原规范中从苏联、德国规范照抄的不合理规定;并将三维动力分析方法引入我国规范。上述研究工作达到了当时国际上同类工作的先进水平,获全国科学大会奖(1978)。林代表规范组起草了与电算有关的全部规范条文;由他定稿的程序下发全国电力设计院应用,效益显著。
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成果数
12
林家浩, J. H. LIN, W. Y. CHE, Y. S. YU
CAS Vol. 15, No. 5-8,-0001,():
-1年11月30日
In this paper, a bi-factor a-β algorithm based on the Kuhn-Tucker criteria about the minimal weight design of a structure under statical and dynamical constraints, is presented. Among the constraints, that of “frequency-prohibited band” is a new formulation which requires any characteristic frequency of the structure not to fall into a certain frequency region. The desing variables may cover sizes of the elements and/or coordinates of the nodes. The upper and lower bounds of each variable are specified, and the stress constraints based on full-stress criteria may also be taken into account. Satisfactory results have been obtained over varous examples wherein the stiffness and/or mass matrices of the structure may be highly nonlinear about the design variables.
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【期刊论文】Pseudo-excitation algorithm for nonstationary random seismic responses
林家浩, Jiahao Lin, Wenshou Zhang, F. W. Williams
Nonstationary random seismic responses: J. H. Lin et al. Engng Struct. 1994, Volume 16, Number 4,-0001,():
-1年11月30日
A simple and accurate algorithm for nonstationary responses of structures subjected to evolutionary random seismic excitation is presented as an extension of the pseudo-excitation method for stationary random seismic responses. The analyses of various time-dependent auto- or cross-power spectral density (PSD) functions have simple and unified formulae. For some important envelope functions, time-dependent PSD functions can be calculated by means of simple frequency-domain analyses.
evolutionary nonstationary random vibration earthquake
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【期刊论文】A FAST CQC ALGORITHM OF PSD MATRICES FOR RANDOM SEISMIC RESPONSES
林家浩, LIN JIAHAO
,-0001,():
-1年11月30日
Under the action of stationary random ground motion any power spectral density matrix of structural responses can be produced through the multiplication of two response vectors which are easily obtained by means of a harmonic response analysis; it is a CQC algorithm with high efficiency and simple procedure. The non-orthogonal damping matrix can be dealt with conveniently and accurately. Two examples are given to help understand the procedure of the algorithm.
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林家浩, Jiahao Lin, Yan Zhao, Yahui Zhang
J. Lin et al. Comput. Methods Appl. Mech. Engrg. 191 (2001) 103-111,-0001,():
-1年11月30日
An accurate and highly efficient algorithm series for structural stationary/non-stationary random response analysis, pseudo excitation method (PEM) is presented. The algorithm series, which have been developed since early 1980s, applies to the randow vibration analyses of structuses subjected to single/multiple, stationary/non-stationary random excitations, including the very attractive issuethe solution of the response to non-uniformly modulated evolutionary random excitations. Each algorithm in this series is an accurate complete quadratic combination (CQC) method because the cross-correlation quadratic terms between the participant modes and between the excitations have both been included. Such algorithms are easy to use because structural stationary random response analysis is reuced to the analysis of structural harmonic response, while structural non-stationary random responses can be readily computed in terrms of any step-by-step integration scheme (e. g. Newmark scheme or the precise integration method).
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【期刊论文】Structural responses to non-uniformly modulated evolutionary random seismic excitations
林家浩
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-1年11月30日
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林家浩
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-1年11月30日
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【期刊论文】Propagation of non-stationary random waves along substructural chains
林家浩
,-0001,():
-1年11月30日
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林家浩
,-0001,():
-1年11月30日
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