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Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 78-98 doi: 10.1007/s11709-022-0936-8
关键词: CFD–FEM coupling steel beam wind ceiling jet numerical heat transfer
Damage detection in beam-like structures using static shear energy redistribution
《结构与土木工程前沿(英文)》 2022年 第16卷 第12期 页码 1552-1564 doi: 10.1007/s11709-022-0903-4
关键词: damage detection beam structure strain energy static displacement variation energy damage index
Laser interference fabrication of large-area functional periodic structure surface
Lei WANG, Zi-Han WANG, Yan-Hao YU, Hong-Bo SUN
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 493-503 doi: 10.1007/s11465-018-0507-9
Functional periodic structures have attracted significant interest due to their natural capabilities in regulating surface energy, surface effective refractive index, and diffraction. Several technologies are used for the fabrication of these functional structures. The laser interference technique in particular has received attention because of its simplicity, low cost, and high-efficiency fabrication of large-area, micro/nanometer-scale, and periodically patterned structures in air conditions. Here, we reviewed the work on laser interference fabrication of large-area functional periodic structures for antireflection, self-cleaning, and superhydrophobicity based on our past and current research. For the common cases, four-beam interference and multi-exposure of two-beam interference were emphasized for their setup, structure diversity, and various applications for antireflection, self-cleaning, and superhydrophobicity. The relations between multi-beam interference and multi-exposure of two-beam interference were compared theoretically and experimentally. Nanostructures as a template for growing nanocrystals were also shown to present future possible applications in surface chemical control. Perspectives on future directions and applications for laser interference were presented.
关键词: laser interference four-beam interference multi-exposure of two-beam interference additive fabrication
Multi-harmonic forced vibration and resonance of simple beams to moving vehicles
《结构与土木工程前沿(英文)》 页码 981-993 doi: 10.1007/s11709-023-0979-5
关键词: forced vibration linear Euler beam moving load harmonic structure frequency modulation end restraints
Xiang LI, Yun LUO, Chengtao WANG, Wenguang ZHANG, Yuanchao LI
《机械工程前沿(英文)》 2012年 第7卷 第1期 页码 66-71 doi: 10.1007/s11465-012-0302-y
Electron beam melting process was used to fabricate porous Ti6Al4V implants. The porous structure and surface topography of the implants were characterized by scanning electron microscopy (SEM) and digital microscopy (DM). The results showed that the pore size was around 600 and the porosity approximated to 57%. There was about±50 μm of undulation on implants surfaces. Standard implants and a custom implant coupled with porous sections were designed and fabricated to validate the versatility of the electron beam melting (EBM) technique. After coated with bone-like apatite, samples with fully porous structures were implanted into cranial defects in rabbits to investigate the in vivo performance. The animals were sacrificed at 8 and 12 weeks after implantation. Bone ingrowth into porous structure was examined by histological analysis. The histological sections indicated that a large amount of new bone formation was observed in porous structure. The newly formed bone grew from the calvarial margins toward the center of the bone defect and was in close contact with implant surfaces. The results of the study showed that the EBM produced Ti6Al4V implants with well-controlled porous structure, rough surface topography and bone-like apatite layer are beneficial for bone ingrowth and apposition.
关键词: electron beam melting process implant porous structure bone ingrowth
Baoyan Duan, Yiqun Zhang, Guangda Chen, Ze Zhao, Jianwei Mi, Xun Li, Lin Yang, Xi Li
《工程(英文)》 doi: 10.1016/j.eng.2023.11.007
This study systematically introduces the development of the world's first full-link and full-system ground demonstration and verification system for the OMEGA space solar power satellite (SSPS). First, the OMEGA 2.0 innovation design was proposed. Second, field-coupling theoretical models of sunlight concentration, photoelectric conversion, and transmitting antennas were established, and a systematic optimization design method was proposed. Third, a beam waveform optimization methodology considering both a high beam collection efficiency and a circular stepped beam shape was proposed. Fourth, a control strategy was developed to control the condenser pointing toward the sun while maintaining the transmitting antenna toward the rectenna. Fifth, a high-efficiency heat radiator design method based on bionics and topology optimization was proposed. Sixth, a method for improving the rectenna array’s reception, rectification, and direct current (DC) power synthesis efficiencies is presented. Seventh, high-precision measurement technology for high-accuracy beam-pointing control was developed. Eighth, a smart mechanical structure was designed and developed. Finally, the developed SSPS ground demonstration and verification system has the capacity for sun tracking, a high concentration ratio, photoelectric conversion, microwave conversion and emission, microwave reception, and rectification, and thus satisfactory results were obtained.
关键词: OMEGA-SSPS Full-link and full-system Beam collection efficiency Circular stepped beam shape Smart structure Field coupling theoretical model Beam pointing control
Damage assessment of laminated composite beam structures using damage locating vector (DLV) method
T. VO-DUY,N. NGUYEN-MINH,H. DANG-TRUNG,A. TRAN-VIET,T. NGUYEN-THOI
《结构与土木工程前沿(英文)》 2015年 第9卷 第4期 页码 457-465 doi: 10.1007/s11709-015-0303-0
关键词: normalized cumulative energy structural health monitoring (SHM) damage locating vector method (DLV) laminated composite beam structure
Scaling up of cluster beam deposition technology for catalysis application
《化学科学与工程前沿(英文)》 2021年 第15卷 第6期 页码 1360-1379 doi: 10.1007/s11705-021-2101-7
关键词: nanoparticle cluster cluster beam deposition magnetron sputtering heterogeneous catalysis
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0703-5
关键词: laser beam welding parameter optimization metamodel multi-objective
Iman FATTAHI, Hamid Reza MIRDAMADI, Hamid ABDOLLAHI
《结构与土木工程前沿(英文)》 2020年 第14卷 第3期 页码 675-689 doi: 10.1007/s11709-020-0625-4
关键词: composite beam dynamic finite element degrees of freedom coupling experimental validation numerical validation
Experimental and numerical analysis of beam to column joints in steel structures
Gholamreza ABDOLLAHZADEH, Seyed Mostafa SHABANIAN
《结构与土木工程前沿(英文)》 2018年 第12卷 第4期 页码 642-661 doi: 10.1007/s11709-017-0457-z
关键词: beam to column connections experiments component method neural network model combinational modeling
《环境科学与工程前沿(英文)》 2023年 第18卷 第4期 doi: 10.1007/s11783-024-1805-6
● Urethane functionalities created on PES membranes via electron beam irradiation.
关键词: Surface functionalization Electron beam irradiation Microfiltration Endocrine disrupting chemicals
郝景新,刘文金,吴新凤
《中国工程科学》 2014年 第16卷 第4期 页码 92-95
最大弯曲正应力是衡量夹层梁弯曲性能的重要参数之一,本文推导出了将软夹芯夹层梁等效成等 截面均质单层梁计算最大弯曲正应力的方法,并在此基础上进行三点弯曲试验的算例研究。结果表明:修正单层梁理论与层合梁理论计算的结果是一致的。当破坏载荷与夹层梁横截面的尺寸一定时,随着芯层与总厚度比的增加,修正单层梁理论计算的最大正应力值逐渐增加,而单层梁理论计算的结果为一恒定值。最大弯曲正应力修正公式的建立为夹层梁的工程应用提供理论基础。
Bending and vibration of a discontinuous beam with a curvic coupling under different axial forces
Heng LIU, Jie HONG, Dayi ZHANG
《机械工程前沿(英文)》 2020年 第15卷 第3期 页码 417-429 doi: 10.1007/s11465-019-0584-4
关键词: discontinuous beam bending stiffness transverse vibration axial loads gyroscopic moments
Mohammad Javad REZVANIL, Mohammad Hossein KARGARNOVIN, Davood YOUNESIAN
《机械工程前沿(英文)》 2011年 第6卷 第4期 页码 409-418 doi: 10.1007/s11465-011-0245-8
The response of an infinite Timoshenko beam subjected to a harmonic moving load based on the third-order shear deformation theory (TSDT) is studied. The beam is made of laminated composite, and located on a Pasternak viscoelastic foundation. By using the principle of total minimum potential energy, the governing partial differential equations of motion are obtained. The solution is directed to compute the deflection and bending moment distribution along the length of the beam. Also, the effects of two types of composite materials, stiffness and shear layer viscosity coefficients of foundation, velocity and frequency of the moving load over the beam response are studied. In order to demonstrate the accuracy of the present method, the results TSDT are compared with the previously obtained results based on first-order shear deformation theory, with which good agreements are observed.
关键词: timoshenko composite beam pasternak viscoelastic foundation third-order shear deformation theory (TSDT) harmonic moving load
标题 作者 时间 类型 操作
Laser interference fabrication of large-area functional periodic structure surface
Lei WANG, Zi-Han WANG, Yan-Hao YU, Hong-Bo SUN
期刊论文
Fabrication and in vivo evaluation of Ti6Al4V implants with controlled porous structure and complex shape
Xiang LI, Yun LUO, Chengtao WANG, Wenguang ZHANG, Yuanchao LI
期刊论文
On the Innovation, Design, Construction, and Experiments of OMEGA-Based SSPS Prototype: The Sun Chasing Project
Baoyan Duan, Yiqun Zhang, Guangda Chen, Ze Zhao, Jianwei Mi, Xun Li, Lin Yang, Xi Li
期刊论文
Damage assessment of laminated composite beam structures using damage locating vector (DLV) method
T. VO-DUY,N. NGUYEN-MINH,H. DANG-TRUNG,A. TRAN-VIET,T. NGUYEN-THOI
期刊论文
Processing parameter optimization of fiber laser beam welding using an ensemble of metamodels and MOABC
期刊论文
Application of consistent geometric decomposition theorem to dynamic finite element of 3D composite beam
Iman FATTAHI, Hamid Reza MIRDAMADI, Hamid ABDOLLAHI
期刊论文
Experimental and numerical analysis of beam to column joints in steel structures
Gholamreza ABDOLLAHZADEH, Seyed Mostafa SHABANIAN
期刊论文
disrupting chemicals from water through urethane functionalization of microfiltration membranes via electron beam
期刊论文
Bending and vibration of a discontinuous beam with a curvic coupling under different axial forces
Heng LIU, Jie HONG, Dayi ZHANG
期刊论文