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Self-adaptive one-dimensional nonlinear finite element method based on element energy projection method 被引量:16
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作者 袁驷 杜炎 +1 位作者 邢沁妍 叶康生 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2014年第10期1223-1232,共10页
The element energy projection (EEP) method for computation of super- convergent resulting in a one-dimensional finite element method (FEM) is successfully used to self-adaptive FEM analysis of various linear probl... The element energy projection (EEP) method for computation of super- convergent resulting in a one-dimensional finite element method (FEM) is successfully used to self-adaptive FEM analysis of various linear problems, based on which this paper presents a substantial extension of the whole set of technology to nonlinear problems. The main idea behind the technology transfer from linear analysis to nonlinear analysis is to use Newton's method to linearize nonlinear problems into a series of linear problems so that the EEP formulation and the corresponding adaptive strategy can be directly used without the need for specific super-convergence formulation for nonlinear FEM. As a re- sult, a unified and general self-adaptive algorithm for nonlinear FEM analysis is formed. The proposed algorithm is found to be able to produce satisfactory finite element results with accuracy satisfying the user-preset error tolerances by maximum norm anywhere on the mesh. Taking the nonlinear ordinary differential equation (ODE) of second-order as the model problem, this paper describes the related fundamental idea, the imple- mentation strategy, and the computational algorithm. Representative numerical exam- ples are given to show the efficiency, stability, versatility, and reliability of the proposed approach. 展开更多
关键词 NONLINEARITY finite element method (FEM) self-adaptive analysis super-convergence element energy projection (EEP)~ ordinary differential equation(ODE)
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Analysis of the Comprehensive Physical Field for a New Flywheel Energy Storage Motor/Generator on Ships 被引量:1
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作者 Yali Yu Yuanxi Wang +1 位作者 Guosheng Zhang Feng Sun 《Journal of Marine Science and Application》 2012年第1期134-142,共9页
A novel flywheel energy storage (FES) motor/generator (M/G) was proposed for marine systems. The purpose was to improve the power quality of a marine power system (MPS) and strengthen the energy recycle. Two str... A novel flywheel energy storage (FES) motor/generator (M/G) was proposed for marine systems. The purpose was to improve the power quality of a marine power system (MPS) and strengthen the energy recycle. Two structures including the magnetic or non-magnetic inner-rotor were contrasted in the magnetostatic field by using finite element analysis (FEA). By optimally designing the size parameters, the average speed of FEA results of was 17 200 r/m, and the current was controlled between 62 and 68 A in the transient field. The electrical machine electromagnetism design was further optimized by the FEA in the temperature field, to find the local overheating point under the normal operation condition and provide guidance for the cooling system. Finally, it can be concluded from the comprehensive physical field analysis that the novel redundant structure M/G can improve the efficiency of the M/G and maintain the stability of the MPS. 展开更多
关键词 marine power system flywheel energy storage Halbach array magnet structure comprehensivephysical field motor/generator finite element analysis
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Energy density response prediction of structures with uncertainty using interval analysis method
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作者 赵阳 王坤 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第4期96-98,共3页
Prediction of vibration energy responses of structures with uncertainties is of interest in many fields. The energy density control equation for one-dimensional structure is provided firstly. Interval analysis method ... Prediction of vibration energy responses of structures with uncertainties is of interest in many fields. The energy density control equation for one-dimensional structure is provided firstly. Interval analysis method is applied to the control equation to obtain the range of energy density responses of structures with interval parameters. A cantilever beam with interval-valued damping coefficient is exemplified to carry out a simulation. The result shows that the mean value of energy density from the interval analysis method is the same as that from a probabilistic method which validates the interval analysis method. Besides, the response range from the interval analysis method is wider and includes that from the probabilistic method which indicates the interval analysis method is a more conservative method and is safer in realistic engineering structures. 展开更多
关键词 interval analysis method energy finite Element Method uncertain structures
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Dynamic analysis and experimental study of vibro-acoustic system with uncertainties at middle frequencies 被引量:2
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作者 焦仁强 张建润 薛飞 《Journal of Southeast University(English Edition)》 EI CAS 2017年第2期166-170,共5页
To take into account the influence of uncetainties on the dynamic response of the vibro-acousitc structure, a hybrid modeling technique combining the finite element method(FE)and the statistic energy analysis(SEA)... To take into account the influence of uncetainties on the dynamic response of the vibro-acousitc structure, a hybrid modeling technique combining the finite element method(FE)and the statistic energy analysis(SEA) is proposed to analyze vibro-acoustics responses with uncertainties at middle frequencies. The mid-frequency dynamic response of the framework-plate structure with uncertainties is studied based on the hybrid FE-SEA method and the Monte Carlo(MC)simulation is performed so as to provide a benchmark comparison with the hybrid method. The energy response of the framework-plate structure matches well with the MC simulation results, which validates the effectiveness of the hybrid FE-SEA method considering both the complexity of the vibro-acoustic structure and the uncertainties in mid-frequency vibro-acousitc analysis. Based on the hybrid method, a vibroacoustic model of a construction machinery cab with random properties is established, and the excitations of the model are measured by experiments. The responses of the sound pressure level of the cab and the vibration power spectrum density of the front windscreen are calculated and compared with those of the experiment. At middle frequencies, the results have a good consistency with the tests and the prediction error is less than 3. 5dB. 展开更多
关键词 hybrid finite element method and statistic energy analysis(FE-SEA) method dynamic analysis vibroacoustic system UNCERTAINTIES mid-frequency range
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Numerical and experimental analysis of the closed-cell aluminium foam under low velocity impact using computerized tomography technique 被引量:3
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作者 S.Talebi M.Sadighi M.M.Aghdam 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2019年第1期144-155,I0005,共13页
In the present work, the response of closed-cell aluminum foams under low-velocity impact has been studied numerically and experimentally. Computerized tomography is employed to access three-dimensional (3D) microstru... In the present work, the response of closed-cell aluminum foams under low-velocity impact has been studied numerically and experimentally. Computerized tomography is employed to access three-dimensional (3D) microstructure of the closed-cell aluminum foam. Effective parameters including foam density and the velocity of impactor on foam dynamic behavior are investigated. In order to show the validity and accuracy of results, some static experiments and low-velocity impact tests have been conducted. Results in dicate a remarkable agree me nt between the simulation and experimental data. Moreover, the results show that by increasing the density of foam samples, the highest difference between numerical and experimenidi results for peak stress and absorbed energy are 35.9% and 6.9%, respectively, which is related to the highest density. For impact velocities ranging from 3.1 to 4.2 m/s, the maximum discrepancy in peak stress and absorbed energy occur at an inipact velocity of 3.1 m/s in which corresponding errors are 33.3% and 6.6%, respectively. For the impact velocity of 40 m/s, the highest increase in peak stress and absorbed energy are 667.9% and 370.3% associated with the density of 0.5 and 0.3 g/cm^3, respectively. 展开更多
关键词 finite ELEMENT analysis Impact Aluminum foam Experimental analysis energy ABSORPTION
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Design and Analysis of a Magnetic Bearings with Three Degrees of Freedom 被引量:1
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作者 Ye Yuan Yukun Sun Qianwen Xiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2019年第1期142-151,共10页
The current research of supporting and transmission system in flywheel energy storage system(FESS) focuses on the low consumption design. However, friction loss is a non-negligible factor in the high-speed but lightwe... The current research of supporting and transmission system in flywheel energy storage system(FESS) focuses on the low consumption design. However, friction loss is a non-negligible factor in the high-speed but lightweight FESS energy and momentum storage with mechanical-type supporting system. In order to realize the support system without mechanical loss and to maximize the e ciency of the flywheel battery, a permanent magnet biased magnetic bearings(PMBMB) is applied to the FESS with the advantages of low loss, high critical speed, flexible controllability and compact structure. In this frame, the relevant research of three degrees of freedom(3-DOF) PMBMB for a new type FESS is carried out around the working principle, structural composition, coupling characteristics analysis, mathematical model, and structural design. In order to verify the performance of the 3-DOF PMBMB, the radial force mathematical model and the coupling determination equations of radial two DOF are calculated according to an equivalent magnetic circuit, and radial–axial coupling is analyzed through finite element analysis. Moreover, a control system is presented to solve the control problems in practical applications. The rotor returns to the balanced position in 0.05 s and maintains stable suspension. The displacement fluctuation is approximately 40 μm in the y direction and 30 μm in the x direction. Test results indicate that the dynamic rotor of the proposed flywheel energy storage system with PMBMB has excellent characteristics, such as good start-of-suspension performance and stable suspension characteristics. The proposed research provides the instruction to design and control a low loss support system for FESS. 展开更多
关键词 FLYWHEEL energy storage system Magnetic bearings DEGREES of FREEDOM Coupling finite ELEMENT analysis
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Vibration Analysis of Vehicle Floor Panel Using Hybrid Method of FEM and SEA 被引量:1
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作者 Kazuhito Misaji Yusuke Suzuki +2 位作者 Ayumi Takahashi Fumihiko Ide Theophane Courtois 《Journal of Mechanics Engineering and Automation》 2014年第4期305-310,共6页
In order to improve the mass efficiency of an automotive soundproof package, it is important to predict the middle to high frequency range of noise and vibration during vehicle operation. A hybrid method of experiment... In order to improve the mass efficiency of an automotive soundproof package, it is important to predict the middle to high frequency range of noise and vibration during vehicle operation. A hybrid method of experimental and analytical SEA (statistical energy analysis) has been applied for the prediction of air-borne noise. However, for predicting structure-borne noise, there are no definitive simulation methods that can address the soundproof specifications in an actual vehicle. Thus, in this paper, a FEM (finite element method)'SEA hybrid method is used. The FEM'SEA hybrid method predicts structure-borne noise in the middle to high frequency range. First, we explain the basic concept of the FEM'SEA hybrid method; Second, we describe our experiment to verify the analytical results of the FEM'SEA hybrid method; Third, we provide the details of the FEM model versus the FEM'SEA hybrid model; Finally, we verify the validity and availability of the FEM'SEA hybrid method through comparisons of the FEM analysis results, FEM-SEA analysis results and measured results. 展开更多
关键词 VIBRATION noise statistical energy analysis finite element method.
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Dynamic crushing behaviors and enhanced energy absorption of bio-inspired hierarchical honeycombs with different topologies 被引量:2
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作者 Xin-chun Zhang Nan-nan Liu +3 位作者 Chao-chao An He-xiang Wu Na Li Ke-ming Hao 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第4期99-111,共13页
In order to pursue good crushing load uniformity and enchance energy absorption efficiency of conventional honeycombs, a kind of bio-inspired hierarchical honeycomb model is proposed by mimicking the arched crab shell... In order to pursue good crushing load uniformity and enchance energy absorption efficiency of conventional honeycombs, a kind of bio-inspired hierarchical honeycomb model is proposed by mimicking the arched crab shell structures. Three bio-inspired hierarchical honeycombs(BHHs) with different topologies are designed by replacing each vertex of square honeycombs with smaller arc-shaped structures. The effects of hierarchical topologies and multi-material layout on in-plane dynamic crushings and absorbed-energy capacities of the BHHs are explored based on the explicit finite element(FE) analysis.Different deformation modes can be observed from the BHHs, which mainly depend upon hierarchical topologies and impact velocities. According to energy efficiency method and one-dimensional(1D) shock theory, calculation formulas of densification strains and plateau stresses for the BHHs are derived to characterize the dynamic bearing capacity, which is consistent well with FE results. Compared with conventional honeycombs, the crushing load efficiency and energy absorption capacity of the BHHs can be improved by changing the proper hierarchical topology and multi-material layout. These researches will provide theoretical guidance for innovative design and dynamic response performance controllability of honeycombs. 展开更多
关键词 Bio-inspired honeycombs Crushing load uniformity energy absorption Hierarchical topologies finite element analysis
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Modified characteristic finite difference fractional step method for moving boundary value problem of nonlinear percolation system
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作者 袁益让 李长峰 +1 位作者 孙同军 刘允欣 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2013年第4期417-436,共20页
A fractional step scheme with modified characteristic finite differences run- ning in a parallel arithmetic is presented to simulate a nonlinear percolation system of multilayer dynamics of fluids in a porous medium w... A fractional step scheme with modified characteristic finite differences run- ning in a parallel arithmetic is presented to simulate a nonlinear percolation system of multilayer dynamics of fluids in a porous medium with moving boundary values. With the help of theoretical techniques including the change of regions, piecewise threefold quadratic interpolation, calculus of variations, multiplicative commutation rule of differ- ence operators, multiplicative commutation rule of difference operators, decomposition of high order difference operators, induction hypothesis, and prior estimates, an optimal order in 12 norm is displayed to complete the convergence analysis of the numerical algo- rithm. Some numerical results arising in the actual simulation of migration-accumulation of oil resources by this method are listed in the last section. 展开更多
关键词 multilayer nonlinear percolation system moving boundary values modified characteristic fractional finite difference optimal order convergence analysis numerical simulation of energy source
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Crushing analysis and multiobjective crashworthiness optimization of bitubular polygonal tubes with internal walls
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作者 李健 高广军 +1 位作者 邹翔 关维元 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第11期3040-3050,共11页
In order to reduce casualties and property losses in a collision accident, thin-walled structure has been extensively used as energy absorber in crashworthiness design of train. With the help of energy absorber, colli... In order to reduce casualties and property losses in a collision accident, thin-walled structure has been extensively used as energy absorber in crashworthiness design of train. With the help of energy absorber, collision kinetic energy can be controllably dissipated by the plastic deformation of structures. A new kind of multi-cell thin-walled structure called as bitubular polygonal tubes with internal walls(BPTIW) was constructed. The crashworthiness characteristics of BPTIWs were investigated by LS-DYNA. It can be found that the BPTIW with 12 sides has the most excellent crashworthiness characteristics. Therefore, based on response surface method(RSM) and multiobjective particle optimization(MOPSO) algorithm, the BPTIW with 12 sides was selected to optimize the dimensions of cross-sectional configuration under different constraints of energy absorption(EA) and crushing peak force(CPF). The results show that the optimal designs of BPTIW12 under different constraints present excellent crashworthiness characteristics and can be used in the practical engineering. 展开更多
关键词 crashworthiness optimization thin-walled structure energy absorption response surface method finite element analysis
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Modal Analysis of Battery Box Based on ANSYS
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作者 Jianong Wang Xiaoyu Zhao 《World Journal of Engineering and Technology》 2016年第2期290-295,共6页
At present, the development of the traditional car is more and more troubled by the high cost of environmental pollution and oil prices, many countries have paid increasingly attention to the research and development ... At present, the development of the traditional car is more and more troubled by the high cost of environmental pollution and oil prices, many countries have paid increasingly attention to the research and development of electric vehicles. And vehicle battery box, as the heart of the automobile power system, and many difficulties still exist in its research and development. This paper is based on ANSYS. By using the finite element theory, it is to analyze the modal characteristics of the battery box and frequency vibration characteristics. Having a more comprehensive grasp of the dynamic performance of the battery box is the key to solve the new energy automotive research and development of issues. 展开更多
关键词 New energy Battery Box finite Element Theory Mode analysis
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An Upwind Mixed Finite Volume Element-fractional Step Method and Convergence Analysis for Three-dimensional Compressible Contamination Treatment from Nuclear Waste
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作者 Chang-feng LI Yi-rang YUAN Huai-ling SONG 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2023年第4期808-829,共22页
In this paper the authors discuss a numerical simulation problem of three-dimensional compressible contamination treatment from nuclear waste. The mathematical model, a nonlinear convection-diffusion system of four PD... In this paper the authors discuss a numerical simulation problem of three-dimensional compressible contamination treatment from nuclear waste. The mathematical model, a nonlinear convection-diffusion system of four PDEs, determines four major physical unknowns: the pressure, the concentrations of brine and radionuclide, and the temperature. The pressure is solved by a conservative mixed finite volume element method, and the computational accuracy is improved for Darcy velocity. Other unknowns are computed by a composite scheme of upwind approximation and mixed finite volume element. Numerical dispersion and nonphysical oscillation are eliminated, and the convection-dominated diffusion problems are solved well with high order computational accuracy. The mixed finite volume element is conservative locally, and get the objective functions and their adjoint vector functions simultaneously. The conservation nature is an important character in numerical simulation of underground fluid. Fractional step difference is introduced to solve the concentrations of radionuclide factors, and the computational work is shortened significantly by decomposing a three-dimensional problem into three successive one-dimensional problems. By the theory and technique of a priori estimates of differential equations, we derive an optimal order estimates in L2norm. Finally, numerical examples show the effectiveness and practicability for some actual problems. 展开更多
关键词 compressible nuclear waste contamination in porous media upwind mixed finite volume elementfractional step conservation of mass and energy convergence analysis numerical example
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焊接多腔双钢板-混凝土组合剪力墙抗震性能分析 被引量:1
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作者 丁发兴 蔡勇强 +3 位作者 王莉萍 孙浩 吕飞 黄修文 《华南理工大学学报(自然科学版)》 EI CSCD 北大核心 2024年第1期15-25,共11页
大多数双钢板-混凝土组合剪力墙采用螺栓连接或焊接肋的方式使钢板和混凝土协同工作。然而,这种连接方式可能导致整体性和塑性变形效率较低,且制作复杂,焊接多腔双钢板-混凝土组合剪力墙能够有效地避免这些问题。为了深入研究焊接多腔... 大多数双钢板-混凝土组合剪力墙采用螺栓连接或焊接肋的方式使钢板和混凝土协同工作。然而,这种连接方式可能导致整体性和塑性变形效率较低,且制作复杂,焊接多腔双钢板-混凝土组合剪力墙能够有效地避免这些问题。为了深入研究焊接多腔双钢板-混凝土组合剪力墙的抗震性能,基于约束混凝土真三轴塑性-损伤本构模型和钢材弹塑性混合强化-韧性损伤本构模型,建立了组合剪力墙的精细化三维实体-壳模型,将模拟所得的滞回曲线、骨架曲线、刚度退化曲线、弹性刚度、承载力、累积耗能、等效阻尼粘滞系数和延性系数与已有拟静力试验结果相比较,发现两者吻合较好。分析结果表明:轴压比对组合剪力墙模型算例刚度和承载力的影响较小,而随剪跨比增大,组合剪力墙模型算例的刚度和承载力呈线性降低;轴压比对组合剪力墙模型算例总塑性耗能的影响较小,而剪跨比的影响较大,剪力墙总塑性耗能随剪跨比增大而降低;轴压比和剪跨比都不会改变算例各部件的耗能分配机制,即组合剪力墙模型算例以外钢板和内隔板耗能为主。 展开更多
关键词 双钢板-混凝土组合剪力墙 抗震性能 塑性耗能 有限元分析
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轴向串联式吸能管的缓冲吸能特性
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作者 张筱 肖勇 +3 位作者 刘洪波 刘奇 杜小坤 张洋洋 《爆炸与冲击》 EI CAS CSCD 北大核心 2024年第11期102-111,共10页
针对工程技术领域的碰撞载荷削峰减载问题,采用数值模拟与试验相结合的方法研究了轴向串联式吸能管的吸能特性:首先基于材料高速拉伸试验,构建吸能管的材料Johnson-Cook动态本构参数,并对拟合参数有效性进行评估;随后通过数值模拟与高... 针对工程技术领域的碰撞载荷削峰减载问题,采用数值模拟与试验相结合的方法研究了轴向串联式吸能管的吸能特性:首先基于材料高速拉伸试验,构建吸能管的材料Johnson-Cook动态本构参数,并对拟合参数有效性进行评估;随后通过数值模拟与高速冲击试验研究高速撞击过程中吸能管的缓冲吸能特性,评估仿真与试验的一致性;最终通过数值模拟对吸能管轴向串联构型与单管构型之间的吸能评价指标开展对比分析。分析研究表明:数值模拟与冲击试验的变形模式、载荷曲线、吸能评价指标均吻合较好,材料性能参数准确,仿真预示方法有效,高速冲击试验方案合理可信;与相同结构参数的串联构型吸能管相比,单管构型吸能管在压缩过程中会出现非轴对称、不稳定的扭曲变形,单管构型的有效压缩行程减小了13%,峰值载荷提高了33.4%,撞击瞬间载荷提高了15%,平均压缩力提高了13%,载荷峰均比提高了17.7%;吸能管的串联构型是更为理想的缓冲吸能结构。 展开更多
关键词 轴向串联 吸能管 动态本构 有限元模拟 高速冲击试验
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新型桥梁“耗能-限位”一体化弧形板装置力学性能试验及参数敏感性分析
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作者 耿波 顾冉星 +3 位作者 贾俊峰 刘海明 王浩 唐光武 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第5期1143-1153,共11页
为解决强震作用下中小跨径简支梁桥的落梁问题,研发了一种经济高效、安装便捷的新型“耗能限位”梁一体化弧形板装置.首先采用拟静力试验研究了不同截面的弧形板装置滞回耗能行为和疲劳破坏机理,接着采用数值分析的手段探讨了参数对装... 为解决强震作用下中小跨径简支梁桥的落梁问题,研发了一种经济高效、安装便捷的新型“耗能限位”梁一体化弧形板装置.首先采用拟静力试验研究了不同截面的弧形板装置滞回耗能行为和疲劳破坏机理,接着采用数值分析的手段探讨了参数对装置力位移骨架曲线及等效阻尼比的影响规律,并补充了弧形板装置的防落梁行为模式与极限承载能力.结果表明:提出的新型弧形板装置具有优异的耗能能力,T形截面的弧形板结构更加合理,等效阻尼比最大能达到近40%;弧形板装置可通过分离几何参数对耗能能力、滞回强度、刚度及位移能力进行设计,增大中间截面的腹板高度h2是提高弧形板耗能能力的最有效手段,增加50%的h2能提高50.1%的最大强度与约4.7%的等效阻尼比.所提出的新型防落梁装置为桥梁中小震消能和强震柔性防落梁提供一体化装置解决方案. 展开更多
关键词 桥梁抗震 弧形钢板装置 消能阻尼器 防落梁装置 拟静力试验 有限元分析
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基于改进BESO法连续体结构拓扑优化研究
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作者 南波 王露婕 +2 位作者 梁家聪 迟远鹏 刘文合 《沈阳农业大学学报》 CAS CSCD 北大核心 2024年第5期583-593,共11页
拓扑优化与传统尺寸优化和形状优化相比,提供了更广泛的设计灵活性,其应用越来越广泛。伴随着结构拓扑优化的发展,其优化方法也在不断进步,因此,其方法的研究凸显出重要的理论及工程应用价值。由于双向渐进结构优化方法(bi-directional ... 拓扑优化与传统尺寸优化和形状优化相比,提供了更广泛的设计灵活性,其应用越来越广泛。伴随着结构拓扑优化的发展,其优化方法也在不断进步,因此,其方法的研究凸显出重要的理论及工程应用价值。由于双向渐进结构优化方法(bi-directional evolutionary structural optimization,BESO)有很强的通用性,理论和程序实现简单,优化效率高,能够得到一系列黑/白分布的拓扑构型,正日益广泛地应用于工程实际当中。但双向渐进结构优化方法和其改进的方法在对于解决应力约束下的拓扑优化问题上一直都存在着不可忽视的问题。针对连续体结构,采用ABAQUS软件和改进双向渐进结构优化方法相结合来实现结构的拓扑优化,从而能够解决应力约束拓扑优化问题,进而证明其优越性以及应用在工程实例的可行性,详细描述BESO方法及其在工程领域中的应用,分析双向渐进结构优化方法成功的根本原因,以及相较于其他拓扑优化方法的优点,然后基于约束条件优化问题,提出约束条件与拓扑变量的关系。以结构应变能最小化为目标,利用拉格朗日方法推导出以应力约束作为约束条件,对C形夹、工字钢梁结构进行拓扑优化,验证了改进双向渐进结构优化法的有效性,提高了材料利用率,从而验证了改进双向渐进结构优化法在实际工程中的可行性。 展开更多
关键词 拓扑优化 改进BESO法 有限元分析 最小应变能
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新型切口厚壁钢管耗能支撑抗震性能研究及参数分析
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作者 郑国足 韩建平 《工程力学》 EI CSCD 北大核心 2024年第9期201-213,共13页
为了解决现有金属耗能装置连接复杂或容易发生非预期破坏等问题,提出了一种新型切口厚壁钢管耗能支撑(energy-dissipation brace with notched thick-walled steel tube,EDB-NTWST)。该支撑主要依靠首次提出的切口厚壁钢管(notched thic... 为了解决现有金属耗能装置连接复杂或容易发生非预期破坏等问题,提出了一种新型切口厚壁钢管耗能支撑(energy-dissipation brace with notched thick-walled steel tube,EDB-NTWST)。该支撑主要依靠首次提出的切口厚壁钢管(notched thick-walled steel tube,NTWST)耗能,震后仅需更换NTWST即可完成修复,因而可提高结构震后修复速度。针对切口厚壁钢管的不同布置方式,给出了两种支撑的构造形式,并推导了NTWST简化力学分析方法。通过试验研究,验证了理论计算及数值模拟的准确性。采用参数化分析方法,设计了16个NTWST试件,在单调加载和循环荷载下分别对其进行了有限元分析。结果表明:EDB-NTWST的滞回曲线饱满,变形能力强,延性高,可将损伤集中于NTWST上,能够实现可重复使用的目标;简化力学分析方法与试验结果吻合较好,可用于EDB-NTWST的初步设计;NTWST的力学性能能够通过调整其设计参数进行改变,承载力的提高可通过加大耗能环厚度来实现,增加耗能环的数量可以显著提高其变形能力,增加耗能环的宽度并减小中径,是提高NTWST延性的有效方法。 展开更多
关键词 切口厚壁钢管 耗能支撑 抗震性能 试验研究 有限元分析 ABAQUS
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基于实测数据立式热水储能罐罐壁力学特性分析
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作者 李雄彦 魏金刚 薛素铎 《建筑结构》 北大核心 2024年第5期92-97,85,共7页
为掌握立式储能罐结构的受力特征,基于某30 000 m~3立式热水储能罐项目,依托远程监测技术采集了运行状态下罐壁应力和温度数据,将采集结果与考虑罐底摩擦接触约束建立的有限元模型分析结果进行比较,验证了此有限元模拟方法的合理性;依... 为掌握立式储能罐结构的受力特征,基于某30 000 m~3立式热水储能罐项目,依托远程监测技术采集了运行状态下罐壁应力和温度数据,将采集结果与考虑罐底摩擦接触约束建立的有限元模型分析结果进行比较,验证了此有限元模拟方法的合理性;依托实测温度数据,研究了立式储能罐罐壁热力耦合作用下罐壁位移以及应力分布规律。结果表明:罐壁底部和顶部为温度影响敏感区域,温度升高,使其产生压应力;对于环向应力,在底部受温度荷载影响较顶部更显著;而对于竖向应力,影响主要是罐壁底部;温度对罐壁变形影响较大,在空罐时,最大位移位置出现在罐壁最顶端;而满罐时最大变形位置出现在中上部的位置,温度作用大于静水压力对罐壁变形的影响。 展开更多
关键词 立式储能罐 健康监测 有限元分析 热力耦合
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预制可更换人工塑性铰连接的非线性有限元分析
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作者 吴成龙 尚育卿 +4 位作者 郑灵枫 王其辉 潘昊 赵飞 王明 《江苏大学学报(自然科学版)》 CAS 北大核心 2024年第3期354-361,共8页
为提高装配式框架节点的抗震性能,基于仿生学设计,提出一种具有结构“保险丝”功能的可更换人工塑性铰连接构造,设计了9个不同参数的可更换人工塑性铰试件.利用Abaqus软件,对可更换人工塑性铰试件施加低周往复荷载,探究该构造的破坏模... 为提高装配式框架节点的抗震性能,基于仿生学设计,提出一种具有结构“保险丝”功能的可更换人工塑性铰连接构造,设计了9个不同参数的可更换人工塑性铰试件.利用Abaqus软件,对可更换人工塑性铰试件施加低周往复荷载,探究该构造的破坏模式、滞回性能、刚度退化等抗震特性.研究结果表明:可更换人工塑性铰构造的破坏位置主要集中于翼缘屈曲可更换连接板处,破坏模式为翼缘屈曲可更换连接板屈曲变形和抗剪耗能杆的剪切变形破坏;梁端弯矩-层间位移角的滞回曲线饱满,且有螺栓滑移现象,等效黏滞阻尼系数为0.30~0.45,延性系数为3.64~14.00,表现出良好的塑性变形和耗能能力. 展开更多
关键词 塑性铰 装配式 低周往复荷载 有限元分析 耗能能力
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基于Pushover方法的耗能自复位铰节点框架结构抗震性能分析
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作者 鲁亮 颜浩天 叶雨立 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期608-615,共8页
基于Pushover分析方法研究设置耗能自复位铰节点(EDSC-HJ)的钢筋混凝土框架结构的抗震性能.首先介绍EDSC-HJ框架的结构形式,并建立了EDSC-HJ框架结构的有限元模型,通过与振动台试验结果对比验证数值模拟的正确性;其次使用Pushover方法计... 基于Pushover分析方法研究设置耗能自复位铰节点(EDSC-HJ)的钢筋混凝土框架结构的抗震性能.首先介绍EDSC-HJ框架的结构形式,并建立了EDSC-HJ框架结构的有限元模型,通过与振动台试验结果对比验证数值模拟的正确性;其次使用Pushover方法计算EDSC-HJ框架有控结构与无控结构的抗震性能并设计节点弹性恢复装置和耗能装置的力学参数.结果表明:EDSC-HJ框架结构节点相对转动刚度比的合理取值区间为0.05~0.5;设置节点阻尼器的EDSC-HJ有控结构的层间位移响应下降了76%,且满足限值要求;由于节点阻尼器的设置提高了结构的附加抗侧刚度,有控结构的基底剪力响应提高了23%.EDSC-HJ框架结构的抗震性能明显优于钢筋混凝土框架(RCF)结构,具有良好的韧性结构特征. 展开更多
关键词 PUSHOVER分析 抗震性能 耗能自复位铰节点 有限元模型 阻尼器
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