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General expression for linear and nonlinear time series models
Ren HUANG, Feiyun XU, Ruwen CHEN
《机械工程前沿(英文)》 2009年 第4卷 第1期 页码 15-24 doi: 10.1007/s11465-009-0015-z
关键词: linear and nonlinear autoregressive model system identification time series analysis
Linear and nonlinear elastic analysis of closely spaced strip foundations using Pasternak model
Priyanka GHOSH, S. RAJESH, J. SAI CHAND
《结构与土木工程前沿(英文)》 2017年 第11卷 第2期 页码 228-243 doi: 10.1007/s11709-016-0370-x
关键词: bearing capacity linear and non-linear elasticity foundation interaction effect numerical modeling Pasternak model
Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD
《能源前沿(英文)》 2015年 第9卷 第4期 页码 413-425 doi: 10.1007/s11708-015-0379-1
关键词: Takagi-Sugeno (T-S) fuzzy systems sector nonlinearity nonlinear controller linear matrix inequality (LMI) approach differential mean value theorem (DMVT) field oriented control (FOC) linear parameter varying (LPV)
刘人怀
《中国工程科学》 2000年 第2卷 第11期 页码 60-67
板壳分析是现代固体力学的一个重要分支。这门学科几乎与一切工程设计都有关联,对航天、航空、航海、机械、石化、建筑、水利、动力、仪表、交通等工程设计,尤其具有指导意义。现今,经典的薄板壳线性理论已较成熟,并在各种工程设计中起着指导作用。然而,在薄板壳非线性领域和厚板壳线性领域,还有许多问题未被解决。文章在介绍这门学科发展历史的基础上,概述了作者近四十年结合工程实际对波纹板壳、单层板壳、双层金属旋转扁壳、网格扁壳、夹层板壳和复合材料层合板壳等六类薄板壳的非线性弯曲、稳定和振动问题以及厚、薄板壳弯曲问题进行理论探索的情况。
Non linear modeling of three-dimensional reinforced and fiber concrete structures
Fatiha IGUETOULENE, Youcef BOUAFIA, Mohand Said KACHI
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 439-453 doi: 10.1007/s11709-017-0433-7
关键词: numerical modeling column and beam nonlinear analysis fibers pious reinforcement 3D formulation response load-deflection
采用线性和非线性拟合方法进行指数模型参数估计 Article
Ping YANG,Chao-peng WU,Yi-lu GUO,Hong-bo LIU,Hui HUANG,Hang-zhou WANG,Shu-yue ZHAN,Bang-yi TAO,Quan-quan MU,Qiang WANG,Hong SONG
《信息与电子工程前沿(英文)》 2017年 第18卷 第3期 页码 434-444 doi: 10.1631/FITEE.1601683
Pedro A. Castillo Castillo Pedro M. Castro,Vladimir Mahalec
《工程(英文)》 2017年 第3卷 第2期 页码 188-201 doi: 10.1016/J.ENG.2017.02.005
汽油调合调度是炼油工业中的一个重要问题。一方面,该问题具有调度问题本身所具有的组合优化特性;另一方面,由于调合各种具有不同品质特性的物料,导致该优化问题的非凸性。本文提出一种新型的全局优化算法,用于求解基于连续时间汽油调合调度模型的混合整数非线性规划问题。该模型包含调合配方优化、分配问题及若干操作特性和约束;算法上采用分段McCormick 松弛(PMCR) 和规范多参数解聚(NMDT),计算全局最优解的估计值,其松弛技术将双线性项中的一个变量值域进行分割,进而在每一个分段上产生凸松弛;通过增加分段数和缩减变量的值域,提高对全局最优解的估计。本文利用该算法求解四个案例,并与两个商业全局优化求解器和两个启发式算法进行比较,结果表明,本文提出的全局优化算法与商业求解器具有同等水平,但是在计算速度上稍逊于启发式算法。
许斌,贺佳
《中国工程科学》 2011年 第13卷 第9期 页码 76-82
提出一种完全基于激励和结构响应实测数据的结构动力系统非线性恢复力识别方法,并通过在一个4层钢结构模型中引入具有非线性特性的磁流变阻尼器(MR)模拟非线性恢复力,基于此模型结构在不同的激励方式下的动力响应测量数据,验证了该方法的有效性。对于结构的各自由度均受到激励的情况,运用最小二乘拟合算法识别出等效线性系统的物理参数(质量、刚度和阻尼矩阵),进而得到模型结构振动过程中MR阻尼力随时间变化情况并与实验实测结果进行了比较。针对结构仅在有限自由度上受到激励的情况,对以上方法进行了改进,提出了一种非线性系统恢复力的非参数化识别方法,利用结构中弹性恢复力的对称关系,分步确定了结构各层间恢复力模型,从而得到MR恢复力的大小并与实测结果进行了比较。结果表明,基于时域实测信号的非线性系统恢复力识别法在完整激励和非完整激励下均能有效地识别结构的非线性恢复力特性。文章所述方法可以运用于工程结构在动力荷载作用下的损伤发生发展过程的监测与识别。
M. R. AKBARI,M. NIMAFAR,D. D. GANJI,M. M. AKBARZADE
《机械工程前沿(英文)》 2014年 第9卷 第4期 页码 402-408 doi: 10.1007/s11465-014-0316-8
The kinematic assumptions upon which the Euler-Bernoulli beam theory is founded allow it to be extended to more advanced analysis. Simple superposition allows for three-dimensional transverse loading. Using alternative constitutive equations can allow for viscoelastic or plastic beam deformation. Euler-Bernoulli beam theory can also be extended to the analysis of curved beams, beam buckling, composite beams and geometrically nonlinear beam deflection. In this study, solving the nonlinear differential equation governing the calculation of the large rotation deviation of the beam (or column) has been discussed. Previously to calculate the rotational deviation of the beam, the assumption is made that the angular deviation of the beam is small. By considering the small slope in the linearization of the governing differential equation, the solving is easy. The result of this simplification in some cases will lead to an excessive error. In this paper nonlinear differential equations governing on this system are solved analytically by Akbari-Ganji’s method (AGM). Moreover, in AGM by solving a set of algebraic equations, complicated nonlinear equations can easily be solved and without any mathematical operations such as integration solving. The solution of the problem can be obtained very simply and easily. Furthermore, to enhance the accuracy of the results, the Taylor expansion is not needed in most cases via AGM manner. Also, comparisons are made between AGM and numerical method (Runge-Kutta 4th). The results reveal that this method is very effective and simple, and can be applied for other nonlinear problems.
关键词: AGM critical load of columns large deformations of beam nonlinear differential equation
Min-Ho CHEY,J. Geoffrey CHASE,John B. MANDER,Athol J. CARR
《结构与土木工程前沿(英文)》 2015年 第9卷 第3期 页码 286-296 doi: 10.1007/s11709-015-0307-9
关键词: tuned mass damper smart building isolation resettable device non-linear statistical assessment
Design and analysis of linear oscillating motor for linear pump application-magnetic field, dynamics
Zongxia JIAO,Tianyi WANG,Liang YAN
《机械工程前沿(英文)》 2016年 第11卷 第4期 页码 351-362 doi: 10.1007/s11465-016-0407-9
A linear oscillating motor is an electromagnetic actuator that can achieve short-stroke reciprocating movement directly without auxiliary transmission mechanisms. It has been widely used in linear pump applications as the source of power and motion. However, because of the demand of high power density in a linear actuation system, the performance of linear oscillating motors has been the focus of studies and deserves further research for high power density. In this paper, a general framework of linear oscillating motor design and optimization is addressed in detail, including the electromagnetic, dynamics, and thermal aspects. First, the electromagnetic and dynamics characteristics are modeled to reveal the principle for optimization. Then, optimization and analysis on magnetic structure, resonant system, and thermal features are conducted, which provide the foundation for prototype development. Finally, experimental results are provided for validation. As a whole, this process offers complete guidance for high power density linear oscillating motors in linear pump applications.
关键词: linear oscillating motor linear pump magnetic field motor optimization
Junxiong LIN , Lan WANG ,
《环境科学与工程前沿(英文)》 2009年 第3卷 第3期 页码 320-324 doi: 10.1007/s11783-009-0030-7
关键词: adsorption pseudo-first order pseudo-second order kinetic model linear method non-linear method
杨晓华,姚卫星,段成美
《中国工程科学》 2003年 第5卷 第4期 页码 81-87
著名的Miner-Palmgren线性累积损伤理论的提出已有70余年,但由于疲劳问题的复杂性,迄今为止还没有一个模型的工程应用价值能与该理论媲美。疲劳累积损伤理论仍在发展与完善中。文章根据疲劳损伤与疲劳累积损伤理论的特点,将确定性疲劳累积损伤理论分成两大类,即线性累积损伤理论和非线性累积损伤理论,并将主要的非线性累积损伤理论分成五类:a. 基于损伤曲线法的非线性累积损伤理论;b. 基于材料物理性能退化概念的非线性累积损伤理论;c. 基于连续损伤力学概念的非线性累积损伤理论;d. 考虑载荷间相互作用效应的非线性累积损伤理论;e. 基于能量法的非线性累积损伤理论。文章分析了每一类模型中有代表性模型的物理背景,回答了模型在疲劳累积损伤理论中存在的主要问题,简要评述了模型的优缺点,讨论了确定性疲劳累积损伤理论的几个关键问题。
Dan V. BOMPA, Ahmed Y. ELGHAZOULI
《结构与土木工程前沿(英文)》 2020年 第14卷 第2期 页码 331-356 doi: 10.1007/s11709-019-0596-5
关键词: non-linear numerical modelling concrete damage plasticity RC flat slabs shear-heads punching shear
New nonlinear stiffness actuator with predefined torque‒deflection profile
《机械工程前沿(英文)》 2023年 第18卷 第1期 doi: 10.1007/s11465-022-0721-3
关键词: compliant actuator nonlinear stiffness actuator nonlinear spring predefined torque−deflection profile
标题 作者 时间 类型 操作
General expression for linear and nonlinear time series models
Ren HUANG, Feiyun XU, Ruwen CHEN
期刊论文
Linear and nonlinear elastic analysis of closely spaced strip foundations using Pasternak model
Priyanka GHOSH, S. RAJESH, J. SAI CHAND
期刊论文
Classical state feedback controller for nonlinear systems using mean value theorem: closed loop-FOC of
Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD
期刊论文
Non linear modeling of three-dimensional reinforced and fiber concrete structures
Fatiha IGUETOULENE, Youcef BOUAFIA, Mohand Said KACHI
期刊论文
采用线性和非线性拟合方法进行指数模型参数估计
Ping YANG,Chao-peng WU,Yi-lu GUO,Hong-bo LIU,Hui HUANG,Hang-zhou WANG,Shu-yue ZHAN,Bang-yi TAO,Quan-quan MU,Qiang WANG,Hong SONG
期刊论文
Scrutiny of non-linear differential equations Euler-Bernoulli beam with large rotational deviation by
M. R. AKBARI,M. NIMAFAR,D. D. GANJI,M. M. AKBARZADE
期刊论文
building isolation systems under multi-level earthquake excitations: Part I, conceptual design and nonlinear
Min-Ho CHEY,J. Geoffrey CHASE,John B. MANDER,Athol J. CARR
期刊论文
Design and analysis of linear oscillating motor for linear pump application-magnetic field, dynamics
Zongxia JIAO,Tianyi WANG,Liang YAN
期刊论文
Comparison between linear and non-linear forms of pseudo-first-order and pseudo-second-order adsorption
Junxiong LIN , Lan WANG ,
期刊论文
Nonlinear numerical simulation of punching shear behavior of reinforced concrete flat slabs with shear-heads
Dan V. BOMPA, Ahmed Y. ELGHAZOULI
期刊论文