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Study of an artificial boundary condition based on the damping-solvent extraction method
Qiang XU, Jianyun CHEN, Jing LI, Mingming WANG
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 281-287 doi: 10.1007/s11709-012-0167-5
关键词: damping-solvent extraction method structure-unlimited-foundation system spring-damper system artificial damping limited region finite element method
Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect
Yikang DU,Kuanmin MAO,Yaming ZHU,Fengyun WANG,Xiaobo MAO,Bin LI
《机械工程前沿(英文)》 2015年 第10卷 第1期 页码 78-88 doi: 10.1007/s11465-015-0331-4
Hydrostatic guideways are used as an alternative to contact bearings due to high stiffness and high damping in heavy machine tools. To improve the dynamic characteristic of bearing structure, the dynamic modeling of the hydrostatic guidway should be accurately known. This paper presents a “mass-spring-Maxwell” model considering the effects of inertia, squeeze, compressibility and static bearing. To determine the dynamic model coefficients, numerical simulation of different cases between displacement and dynamic force of oil film are performed with fluent code. Simulation results show that hydrostatic guidway can be taken as a linear system when it is subjected to a small oscillation amplitude. Based on a dynamic model and numerical simulation, every dynamic model’s parameters are calculated by the Levenberg-Marquardt algorithm. Identification results show that “mass-spring-damper” model is the most appropriate dynamic model of the hydrostatic guidway. This paper provides a reference and preparation for the analysis of the dynamic model of the similar hydrostatic bearings.
关键词: hydrostatic guidway dynamic model dynamic mesh technique Levenberg-Marquardt mass-spring-damper model
张喜刚,裴岷山,袁洪,徐利平,朱斌
《中国工程科学》 2009年 第11卷 第3期 页码 20-25
苏通大桥主跨1 088m,是目前世界上最大跨径的斜拉桥。大桥桥位处建筑条件复杂,抗震和抗风要求高,选择合理的桥梁结构体系是保证结构安全和功能的关键。介绍了苏通大桥结构体系的比选过程,比较了全漂浮、黏滞阻尼器、液压缓冲器和塔梁固接4种体系,重点分析对比了不同参数下黏滞阻尼器和液压缓冲器的结构响应,首次提出了用于桥梁的带有附加限位功能的特大型液体黏滞阻尼器,对阻尼器的设计参数进行了分析研究,并在苏通大桥上实现了这一新型装置。
Evaluation of a developed bypass viscous damper performance
Mahrad FAHIMINIA, Aydin SHISHEGARAN
《结构与土木工程前沿(英文)》 2020年 第14卷 第3期 页码 773-791 doi: 10.1007/s11709-020-0627-2
关键词: developed viscous damper external orifice energy dissipation seismic behavior CFD model of viscous damper a simplified model
Min-Ho CHEY, Jae-Ung KIM
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 267-280 doi: 10.1007/s11709-012-0170-x
关键词: tuned mass damper parametric optimization passive control white noise earthquake excitation
Analysis and characterization of wind-solar-constant torque spring hybridized model
Shantanu ACHARYA,Subhadeep BHATTACHARJEE
《能源前沿(英文)》 2014年 第8卷 第3期 页码 279-289 doi: 10.1007/s11708-014-0312-z
关键词: hybrid vertical axis wind turbine Stirling engine solar-thermal energy wind energy constant torque spring
Back to the spring of Wuhan: facts and hope of COVID-19 outbreak
Guangbiao Zhou, Saijuan Chen, Zhu Chen
《医学前沿(英文)》 2020年 第14卷 第2期 页码 113-116 doi: 10.1007/s11684-020-0758-9
夏敦柱,周百令,王寿荣
《中国工程科学》 2007年 第9卷 第8期 页码 66-68
介绍了在开环工作状态下硅微z轴谐振陀螺仪由于加工工艺缺陷所导致的误差机理。为减小陀螺仪初始电容差和抑制正交耦合误差,提出了一种闭环控制检测策略。重点分析了其力矩反馈器的电刚度效应并给出其线性数学模型表示式。通过对硅微z轴陀螺仪敏感模态的反馈力与谐振频率的关系分析,间接得出了在敏感方向上电负刚度与力矩器所施电压的内在联系,并在实验上进一步验证电刚度效应。这将为下一步闭环控制方案的设计奠定重要基础。
Hysteretic behavior of cambered surface steel tube damper: Theoretical and experimental research
《结构与土木工程前沿(英文)》 2023年 第17卷 第4期 页码 606-624 doi: 10.1007/s11709-023-0925-6
关键词: cambered surface steel tube damper energy dissipation capacity finite element model hysteretic performance parametric study
Static balancing of planar articulated robots
Giuseppe QUAGLIA,Zhe YIN
《机械工程前沿(英文)》 2015年 第10卷 第4期 页码 326-343 doi: 10.1007/s11465-015-0355-9
Static balancing for a manipulator’s weight is necessary in terms of energy saving and performance improvement. This paper proposes a method to design balancing devices for articulated robots in industry, based on robotic dynamics. Full design details for the balancing system using springs are presented from two aspects: One is the optimization for the position of the balancing system; the other is the design of the spring parameters. As examples, two feasible balancing devices are proposed, based on different robotic structures: The first solution consists of linkages and springs; the other consists of pulleys, cross mechanisms and (hydro-) pneumatic springs. Then the two solutions are compared. Pneumatic, hydro-pneumatic and mechanical springs are discussed and their parameters are decided according to the requirements of torque compensation. Numerical results show that with the proper design using the methodology presented in this paper, an articulated robot can be statically balanced perfectly in all configurations. This paper therefore provides a design method of the balancing system for other similar structures.
关键词: robotics static balancing pneumatic spring mechanical spring torque compensation
A perspective of “Nuclear Hot Spring” for long-term sustainable economy of the world
Yingzhong LU
《能源前沿(英文)》 2011年 第5卷 第4期 页码 349-357 doi: 10.1007/s11708-011-0168-4
关键词: natural safety reactor full power natural circulation sustainable world economy
Effect of magneto rheological damper on tool vibration during hard turning
P. Sam PAUL, A. S. VARADARAJAN
《机械工程前沿(英文)》 2012年 第7卷 第4期 页码 410-416 doi: 10.1007/s11465-012-0341-4
Recently, the concept of hard turning has gained considerable attention in metal cutting as it can apparently replace the traditional process cycle of turning, heat treating, and finish grinding for assembly of hard wear resistant steel parts. The present investigation aims at developing a magneto rheological (MR) fluid damper for suppressing tool vibration and promoting better cutting performance during hard turning. The magneto rheological Fluid acts as a viscoelastic spring with non-linear vibration characteristics that are controlled by the composition of the magneto rheological fluid, the shape of the plunger and the electric parameters of the magnetizing field. Cutting experiments were conducted to arrive at a set of electrical, compositional and shape parameters that can suppress tool vibration and promote better cutting performance during turning of AISI 4340 steel of 46 HRC with minimal fluid application using hard metal insert with sculptured rake face. It was observed that the use of MR fluid damper reduces tool vibration and improves the cutting performance effectively. Also commercialization of this idea holds promise to the metal cutting industry.
关键词: tool vibration magneto rheological damper hard turning surface finish tool wear
Danxia ZHAO, Changrong LIAO, Qiong LIU, Jing LUO
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 312-317 doi: 10.1007/s11465-011-0235-x
In this paper, a small displacement-type magnetorheological grease (MRG) damper based on disk squeeze mode is proposed. The squeeze flow differential equation is obtained. The Navier slip condition is considered on the surfaces and the boundary compatible condition is established. The radial velocity profiles and the radial pressure distributions are derived respectively, and the mathematical stress expression is calculated. To verify rationality of analytical method, the MRG damper is designed and fabricated according to the technical requirements of an engine vibration isolation system. The experimental damping force from MTS870 Electro-hydraulic Servo with sine wave excitation shows that the proposed analytical method is feasible and provides the reference value for designing MRG damper based on disk squeeze mode.
Danhui DAN, Qianqing WANG, Jiongxin GONG
《结构与土木工程前沿(英文)》 2021年 第15卷 第1期 页码 244-252 doi: 10.1007/s11709-021-0696-x
关键词: granular material vibration control discrete element method particle damper cable vibration
Caiyun LIU, Francisco PINTO, C. Mariano COSSANI, Sivakumar SUKUMARAN, Matthew P. REYNOLDS
《农业科学与工程前沿(英文)》 2019年 第6卷 第3期 页码 296-308 doi: 10.15302/J-FASE-2019269
The application of spectral reflectance indices (SRIs) as proxies to screen for yield potential (YP) and heat stress (HS) is emerging in crop breeding programs. Thus, a comparison of SRIs and their associations with grain yield (GY) under YP and HS conditions is important. In this study, we assessed the usefulness of 27 SRIs for indirect selection for agronomic traits by evaluating an elite spring wheat association mapping initiative (WAMI) population comprising 287 elite lines under YP and HS conditions. Genetic and phenotypic analysis identified 11 and 9 SRIs in different developmental stages as efficient indirect selection indices for yield in YP and HS conditions, respectively. We identified enhanced vegetation index (EVI) as the common SRI associated with GY under YP at booting, heading and late heading stages, whereas photochemical reflectance index (PRI) and normalized difference vegetation index (NDVI) were the common SRIs under booting and heading stages in HS. Genome-wide association study (GWAS) using 18704 single nucleotide polymorphisms (SNPs) from Illumina iSelect 90K identified 280 and 43 marker-trait associations for efficient SRIs at different developmental stages under YP and HS, respectively. Common genomic regions for multiple SRIs were identified in 14 regions in 9 chromosomes: 1B (60–62 cM), 3A (15, 85–90, 101–105 cM), 3B (132–134 cM), 4A (47–51 cM), 4B (71–75 cM), 5A (43–49, 56–60, 89–93 cM), 5B (124–125 cM), 6A (80–85 cM), and 6B (57–59, 71 cM). Among them, SNPs in chromosome 5A (89–93 cM) and 6A (80–85 cM) were co-located for yield and yield related traits. Overall, this study highlights the utility of SRIs as proxies for GY under YP and HS. High heritability estimates and identification of marker-trait associations indicate that SRIs are useful tools for understanding the genetic basis of agronomic and physiological traits.
关键词: genome-wide association study (GWAS) heat tolerance spectral reflectance spring wheat
标题 作者 时间 类型 操作
Study of an artificial boundary condition based on the damping-solvent extraction method
Qiang XU, Jianyun CHEN, Jing LI, Mingming WANG
期刊论文
Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect
Yikang DU,Kuanmin MAO,Yaming ZHU,Fengyun WANG,Xiaobo MAO,Bin LI
期刊论文
Evaluation of a developed bypass viscous damper performance
Mahrad FAHIMINIA, Aydin SHISHEGARAN
期刊论文
Parametric control of structural responses using an optimal passive tuned mass damper under stationary
Min-Ho CHEY, Jae-Ung KIM
期刊论文
Analysis and characterization of wind-solar-constant torque spring hybridized model
Shantanu ACHARYA,Subhadeep BHATTACHARJEE
期刊论文
Back to the spring of Wuhan: facts and hope of COVID-19 outbreak
Guangbiao Zhou, Saijuan Chen, Zhu Chen
期刊论文
Hysteretic behavior of cambered surface steel tube damper: Theoretical and experimental research
期刊论文
A perspective of “Nuclear Hot Spring” for long-term sustainable economy of the world
Yingzhong LU
期刊论文
Effect of magneto rheological damper on tool vibration during hard turning
P. Sam PAUL, A. S. VARADARAJAN
期刊论文
Analytical study on damping performances of magnetorheological grease damper based on disk squeeze mode
Danxia ZHAO, Changrong LIAO, Qiong LIU, Jing LUO
期刊论文
Application of coupled multi-body dynamics–discrete element method for optimization of particle damper
Danhui DAN, Qianqing WANG, Jiongxin GONG
期刊论文