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Francesco PENTA,Cesare ROSSI,Sergio SAVINO
《机械工程前沿(英文)》 2016年 第11卷 第2期 页码 184-194 doi: 10.1007/s11465-016-0385-y
This study aims to optimize the geometrical parameters of an under-actuated mechanical finger by conducting a theoretical analysis of these parameters. The finger is actuated by a flexion tendon and an extension tendon. The considered parameters are the tendon guide positions with respect to the hinges. By applying such an optimization, the correct kinematical and dynamical behavior of the closing cycle of the finger can be obtained. The results of this study are useful for avoiding the snap-through and the single joint hyperflexion, which are the two breakdowns most frequently observed during experimentation on prototypes. Diagrams are established to identify the optimum values for the tendon guides position of a finger with specified dimensions. The findings of this study can serve as guide for future finger design.
关键词: tendon-driven fingers mechanical finger design under-actuated mechanical systems
Push recovery for the standing under-actuated bipedal robot using the hip strategy
Chao LI,Rong XIONG,Qiu-guo ZHU,Jun WU,Ya-liang WANG,Yi-ming HUANG
《信息与电子工程前沿(英文)》 2015年 第16卷 第7期 页码 579-593 doi: 10.1631/FITEE.14a0230
关键词: Push recovery Balance control Bipedal robot Hip strategy
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 698-710 doi: 10.1007/s11465-021-0646-2
关键词: hydraulic manipulator inverse kinematic redundant design spherical wrist
Multiscale mechanical modeling of hydrated cement paste under tensile load using the combined DEM-MD
Yue HOU, Linbing WANG
《结构与土木工程前沿(英文)》 2017年 第11卷 第3期 页码 270-278 doi: 10.1007/s11709-017-0408-8
Micro-spectrophotometer based on micro electro-mechanical systems technology
ZHOU Lianqun, LI Zhenggang, WU Yihui, ZHANG Ping, XUAN Ming, JIA Hongguang
《机械工程前沿(英文)》 2008年 第3卷 第1期 页码 37-43 doi: 10.1007/s11465-008-0001-x
关键词: mini-spectrophotometer referenced micro-silicon-fixer electro-mechanical correlation coefficient
Rainer HORN, Winfried E. H. BLUM
《农业科学与工程前沿(英文)》 2020年 第7卷 第3期 页码 243-245 doi: 10.15302/J-FASE-2020334
Baoyun ZHAO, Yang LIU, Dongyan LIU, Wei HUANG, Xiaoping WANG, Guibao YU, Shu LIU
《结构与土木工程前沿(英文)》 2020年 第14卷 第2期 页码 322-330 doi: 10.1007/s11709-019-0594-7
关键词: rock-concrete composite specimen contact surface mechanical properties failure mechanism
Preload characteristics identification of the piezoelectric-actuated 1-DOF compliant nanopositioning
Ruizhou WANG, Xianmin ZHANG
《机械工程前沿(英文)》 2015年 第10卷 第1期 页码 20-36 doi: 10.1007/s11465-015-0328-z
Packaged piezoelectric ceramic actuators (PPCAs) and compliant mechanisms are attractive for nanopositioning and nanomanipulation due to their ultra-high precision. The way to create and keep a proper and steady connection between both ends of the PPCA and the compliant mechanism is an essential step to achieve such a high accuracy. The connection status affects the initial position of the terminal moving plate, the positioning accuracy and the dynamic performance of the nanopositioning platform, especially during a long-time or high-frequency positioning procedure. This paper presents a novel external preload mechanism and tests it in a 1-degree of freedom (1-DOF) compliant nanopositioning platform. The 1-DOF platform utilizes a parallelogram guiding mechanism and a parallelogram load mechanism to provide a more accurate actual input displacement and output displacement. The simulation results verify the proposed stiffness model and dynamic model of the platform. The values of the preload displacement, actual input displacement and output displacement can be measured by three capacitive sensors during the whole positioning procedure. The test results show the preload characteristics vary with different types or control modes of the PPCA. Some fitting formulas are derived to describe the preload displacement, actual input displacement and output displacement using the nominal elongation signal of the PPCA. With the identification of the preload characteristics, the actual and comprehensive output characteristics of the PPCA can be obtained by the strain gauge sensor (SGS) embedded in the PPCA.
关键词: nanopositioning preload characteristic packaged piezoelectric ceramic actuator compliant mechanism
Ruifen Liu, Elizabeth Fassman-Beck
《环境科学与工程前沿(英文)》 2017年 第11卷 第4期 doi: 10.1007/s11783-017-0951-5
关键词: Bioretention Hydrologic process Underdrain configuration SWMM Modeling
Lifu YAN, Lingling ZHAO, Guiting YANG, Shichao LIU, Yang LIU, Shangchao LIN
《能源前沿(英文)》 2022年 第16卷 第4期 页码 581-594 doi: 10.1007/s11708-022-0831-y
关键词: inorganic metal halide perovskites mechanical deformation thermoelectrics first-principle calculations Boltzmann transport theory
Genghuang HE, Xianli LIU, Fugang YAN
《机械工程前沿(英文)》 2012年 第7卷 第3期 页码 329-334 doi: 10.1007/s11465-012-0303-x
The dynamic mechanical characteristics of excessively heavy-duty cutting were analyzed based on the cutting experiments with 2.25Cr-1Mo-0.25V steel used in hydrogenated cylindrical shells. By investigating the influence of dynamic mechanical characteristics on the tools’ failure in limited heavy-duty cutting processes, the model of dynamic shearing force in the cutting area was established. However, the experimental results showed that the dynamic shear flow stress in the cutting area greatly influenced the tools’ fatigue. The heavy-duty cutting tool was damaged in the form of a shearing fracture. Through a comprehensive analysis of the theory, the critical condition of the tools’ fracture under extreme loading was established.
关键词: extreme loading cutting shear flow stress dynamic cutting force fatigue fracture
A time−space porosity computational model for concrete under sulfate attack
《结构与土木工程前沿(英文)》 doi: 10.1007/s11709-023-0985-7
关键词: expansion deformation porosity internal expansion stress external sulfate attack mechanical–chemical coupling model
《结构与土木工程前沿(英文)》 2021年 第15卷 第5期 页码 1277-1291 doi: 10.1007/s11709-021-1752-2
关键词: cementitious system mineral additive permeability reducing admixture mechanical properties durability performance
王渭源
《中国工程科学》 2000年 第2卷 第3期 页码 36-41
文章评述了影响微电子机械系统(MEMS)成品率和可靠性的粘合力和摩擦力问题。在用氢氟酸(HF)腐蚀牺牲层、释放多晶Si微结构、干燥时,由于Si片表面薄层水的表面张力使两片亲水、间隙在微米量级的a片粘合起来,称为“释放有关粘合”。粘合也发生在封装后器件中,当输入信号过冲时,由于Si片表面的化学状态将Si片粘合起来,称为“使用中粘合”。解决粘合的最好办法是:在MEMS微结构的表面涂以抗粘合薄膜,将成品器件在干燥气氛下封装。介绍了抗粘合薄膜的制备工艺和目前存在的问题。相比之下,具有高速运动的MEMS,其摩擦力问题更为复杂。应用抗粘合薄膜,解决了粘合,也降低了摩擦力,但摩擦依然存在。摩擦带来磨损,降低器件可靠性和寿命。寻找既抗粘合、又耐磨的薄膜,是解决高速运动MEMS可靠性和寿命的一个关键。
Shuming LIU, Wenjun LIU, Jinduan CHEN, Qi WANG
《环境科学与工程前沿(英文)》 2012年 第6卷 第2期 页码 204-212 doi: 10.1007/s11783-011-0364-9
关键词: demand coverage monitoring optimization water distribution network water quality
标题 作者 时间 类型 操作
Analysis of suitable geometrical parameters for designing a tendon-driven under-actuated mechanical finger
Francesco PENTA,Cesare ROSSI,Sergio SAVINO
期刊论文
Push recovery for the standing under-actuated bipedal robot using the hip strategy
Chao LI,Rong XIONG,Qiu-guo ZHU,Jun WU,Ya-liang WANG,Yi-ming HUANG
期刊论文
Development of a redundant anthropomorphic hydraulically actuated manipulator with a roll–pitch–yaw spherical
期刊论文
Multiscale mechanical modeling of hydrated cement paste under tensile load using the combined DEM-MD
Yue HOU, Linbing WANG
期刊论文
Micro-spectrophotometer based on micro electro-mechanical systems technology
ZHOU Lianqun, LI Zhenggang, WU Yihui, ZHANG Ping, XUAN Ming, JIA Hongguang
期刊论文
Effect of land-use management systems on coupled physical and mechanical, chemical and biological soil
Rainer HORN, Winfried E. H. BLUM
期刊论文
Research on the influence of contact surface constraint on mechanical properties of rock-concrete compositespecimens under compressive loads
Baoyun ZHAO, Yang LIU, Dongyan LIU, Wei HUANG, Xiaoping WANG, Guibao YU, Shu LIU
期刊论文
Preload characteristics identification of the piezoelectric-actuated 1-DOF compliant nanopositioning
Ruizhou WANG, Xianmin ZHANG
期刊论文
Hydrologic experiments and modeling of two laboratory bioretention systems under different boundary conditions
Ruifen Liu, Elizabeth Fassman-Beck
期刊论文
High performance solid-state thermoelectric energy conversion via inorganic metal halide perovskites undertailored mechanical deformation
Lifu YAN, Lingling ZHAO, Guiting YANG, Shichao LIU, Yang LIU, Shangchao LIN
期刊论文
Research on the dynamic mechanical characteristics and turning tool life under the conditions of excessively
Genghuang HE, Xianli LIU, Fugang YAN
期刊论文
Effect of mineral additives and permeability reducing admixtures having different action mechanisms on mechanicaland durability performance of cementitious systems
期刊论文