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Design and modeling of continuum robot based on virtual-center of motion mechanism
《机械工程前沿(英文)》 2023年 第18卷 第2期 doi: 10.1007/s11465-022-0739-6
关键词: VCM mechanism continuum robot flexural joint pseudo-rigid body model cable-driven
Creep life assessment of aero-engine recuperator based on continuum damage mechanics approach
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0702-6
关键词: creep life assessment brazed joint continuum damage mechanics aeroengine recuperator
Comprehensive kinetostatic modeling and morphology characterization of cable-driven continuum robots
《机械工程前沿(英文)》 2023年 第18卷 第3期 doi: 10.1007/s11465-023-0756-0
关键词: kinetostatic modeling morphology characterization variable friction continuum robots in-situ maintenance
Modeling of shear walls using finite shear connector elements based on continuum plasticity
Ulf Arne GIRHAMMAR, Per Johan GUSTAFSSON, Bo KÄLLSNER
《结构与土木工程前沿(英文)》 2017年 第11卷 第2期 页码 143-157 doi: 10.1007/s11709-016-0377-3
关键词: shear walls wall diaphragms finite element modelling plastic shear connector analytical modelling experimental comparison
Layout optimization of steel reinforcement in concrete structure using a truss-continuum model
《结构与土木工程前沿(英文)》 2023年 第17卷 第5期 页码 669-685 doi: 10.1007/s11709-023-0963-0
关键词: bi-directional evolutionary structural optimization steel-reinforced concrete concrete stress reinforcement method hybrid model
Meng DUAN, Jin XIE, Xiaomin MAO
《农业科学与工程前沿(英文)》 2019年 第6卷 第2期 页码 144-161 doi: 10.15302/J-FASE-2019258
Based on our previous work modeling crop growth (CropSPAC) and water and heat transfer in the soil-plant-atmosphere continuum (SPAC), the model was improved by considering the effect of plastic film mulching applied to field-grown maize in North-west China. In CropSPAC, a single layer canopy model and a multi-layer soil model were adopted to simulate the energy partition between the canopy and water and heat transfer in the soil, respectively. The maize growth module included photosynthesis, growth stage calculation, biomass accumulation, and participation. The CropSPAC model coupled the maize growth module and SPAC water and heat transfer module through leaf area index (LAI), plant height and soil moisture condition in the root zone. The LAI and plant height were calculated from the maize growth module and used as input for the SPAC water and heat transfer module, and the SPAC module output for soil water stress conditions used as an input for maize growth module. We used , the representation of evaporation resistance, instead of the commonly used evaporation resistance to reflect the change of latent heat flux of soil evaporation under film mulching as well as the induced change in energy partition. The model was tested in a maize field at Yingke irrigation area in North-west China. Results showed reasonable agreement between the simulations and measurements of LAI, above-ground biomass and soil water content. Compared with the original model, the modified model was more reliable for maize growth simulation under film mulching and showed better accuracy for the LAI (with the coefficient of determination = 0.92, the root mean square of error RMSE= 1.23, and the Nush-Suttclife efficiency E = 0.87), the above-ground biomass (with = 0.96, RMSE= 7.17 t·ha and E = 0.95) and the soil water content in 0–1 m soil layer (with = 0.78, RMSE= 49.44 mm and E = 0.26). Scenarios were considered to simulate the influence of future climate change and film mulching on crop growth, soil water and heat conditions, and crop yield. The simulations indicated that the change of LAI, leaf biomass and yield are negatively correlated with temperature change, but the growing degree-days, evaporation, soil water content and soil temperature are positively correlated with temperature change. With an increase in the ratio of film mulching area, the evaporation will decrease, while the impact of film mulching on crop transpiration is not significant. In general, film mulching is effective in saving water, preserving soil moisture, increasing soil surface temperature, shortening the potential growth period, and increasing the potential yield of maize.
关键词: film mulching growth stage leaf area index maize growth water and heat transfer
Review of human–robot coordination control for rehabilitation based on motor function evaluation
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-022-0684-4
关键词: human–robot coupling lower limb rehabilitation exoskeleton robot motor assessment dynamical model perception
《机械工程前沿(英文)》 2022年 第17卷 第4期 doi: 10.1007/s11465-022-0687-1
关键词: masticatory robot cable-driven linear actuator parallel robot stiffness analysis
Terrain classification and adaptive locomotion for a hexapod robot Qingzhui
Yue ZHAO, Feng GAO, Qiao SUN, Yunpeng YIN
《机械工程前沿(英文)》 2021年 第16卷 第2期 页码 271-284 doi: 10.1007/s11465-020-0623-1
关键词: terrain classification hexapod robot legged robot adaptive locomotion gait control
Strategy for robot motion and path planning in robot taping
Qilong YUAN,I-Ming CHEN,Teguh Santoso LEMBONO,Simon Nelson LANDÉN,Victor MALMGREN
《机械工程前沿(英文)》 2016年 第11卷 第2期 页码 195-203 doi: 10.1007/s11465-016-0390-1
Covering objects with masking tapes is a common process for surface protection in processes like spray painting, plasma spraying, shot peening, etc. Manual taping is tedious and takes a lot of effort of the workers. The taping process is a special process which requires correct surface covering strategy and proper attachment of the masking tape for an efficient surface protection. We have introduced an automatic robot taping system consisting of a robot manipulator, a rotating platform, a 3D scanner and specially designed taping end-effectors. This paper mainly talks about the surface covering strategies for different classes of geometries. The methods and corresponding taping tools are introduced for taping of following classes of surfaces: Cylindrical/extended surfaces, freeform surfaces with no grooves, surfaces with grooves, and rotational symmetrical surfaces. A collision avoidance algorithm is introduced for the robot taping manipulation. With further improvements on segmenting surfaces of taping parts and tape cutting mechanisms, such taping solution with the taping tool and the taping methodology can be combined as a very useful and practical taping package to assist humans in this tedious and time costly work.
关键词: robot taping path planning robot manipulation 3D scanning
A new efficient optimal path planner for mobile robot based on Invasive Weed Optimization algorithm
Prases K. MOHANTY,Dayal R. PARHI
《机械工程前沿(英文)》 2014年 第9卷 第4期 页码 317-330 doi: 10.1007/s11465-014-0304-z
Planning of the shortest/optimal route is essential for efficient operation of autonomous mobile robot or vehicle. In this paper Invasive Weed Optimization (IWO), a new meta-heuristic algorithm, has been implemented for solving the path planning problem of mobile robot in partially or totally unknown environments. This meta-heuristic optimization is based on the colonizing property of weeds. First we have framed an objective function that satisfied the conditions of obstacle avoidance and target seeking behavior of robot in partially or completely unknown environments. Depending upon the value of objective function of each weed in colony, the robot avoids obstacles and proceeds towards destination. The optimal trajectory is generated with this navigational algorithm when robot reaches its destination. The effectiveness, feasibility, and robustness of the proposed algorithm has been demonstrated through series of simulation and experimental results. Finally, it has been found that the developed path planning algorithm can be effectively applied to any kinds of complex situation.
关键词: mobile robot obstacle avoidance Invasive Weed Optimization navigation
An autonomous miniature wheeled robot based on visual feedback control
CHEN Haichu
《机械工程前沿(英文)》 2007年 第2卷 第2期 页码 197-200 doi: 10.1007/s11465-007-0033-7
关键词: measuring distance autonomous locomotion advantage navigation
Analytical dynamic solution of a flexible cable-suspended manipulator
Mahdi BAMDAD
《机械工程前沿(英文)》 2013年 第8卷 第4期 页码 350-359 doi: 10.1007/s11465-013-0271-9
Cable-suspended manipulators are used in large scale applications with, heavy in weight and long in span cables. It seems impractical to maintain cable assumptions of smaller robots for large scale manipulators. The interactions among the cables, platforms and actuators can fully evaluate the coupled dynamic analysis. The structural flexibility of the cables becomes more pronounced in large manipulators. In this paper, an analytic solution is provided to solve cable vibration. Also, a closed form solution can be adopted to improve the dynamic response to flexibility. The output is provided by the optimal torque generation subject to the actuator limitations in a mechatronic sense. Finally, the performance of the proposed algorithm is examined through simulations.
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 142-149 doi: 10.1007/s11465-014-0292-z
In recent years, prediction of the behaviors of micro and nanostructures is going to be a matter of increasing concern considering their developments and uses in various engineering fields. Since carbon nanotubes show the specific properties such as strength and special electrical behaviors, they have become the main subject in nanotechnology researches. On the grounds that the classical continuum theory cannot accurately predict the mechanical behavior of nanostructures, nonlocal elasticity theory is used to model the nanoscaled systems. In this paper, a nonlocal model for nanorods is developed, and it is used to model the carbon nanotubes with the aim of the investigating into their longitudinal vibration. Following the derivation of governing equation of nanorods and estimation of nondimensional frequencies, the effect of nonlocal parameter and the length of the nanotube on the obtained frequencies are studied. Furthermore, differential quadrature method, as a numerical solution technique, is used to study the effect of these parameters on estimated frequencies for both classical and nonlocal theories.
关键词: continuum theory differential quadrature method nanorod longitudinal vibration
Different manipulation mode analysis of a radial symmetrical hexapod robot with leg–arm integration
《机械工程前沿(英文)》 2022年 第17卷 第1期 页码 8-8 doi: 10.1007/s11465-021-0664-0
关键词: leg–arm integration hexapod robot fixed coordinated manipulation mobile manipulation
标题 作者 时间 类型 操作
Comprehensive kinetostatic modeling and morphology characterization of cable-driven continuum robots
期刊论文
Modeling of shear walls using finite shear connector elements based on continuum plasticity
Ulf Arne GIRHAMMAR, Per Johan GUSTAFSSON, Bo KÄLLSNER
期刊论文
Modeling water and heat transfer in soil-plant-atmosphere continuum applied to maize growth under plastic
Meng DUAN, Jin XIE, Xiaomin MAO
期刊论文
Review of human–robot coordination control for rehabilitation based on motor function evaluation
期刊论文
Development of a masticatory robot using a novel cable-driven linear actuator with bidirectional motion
期刊论文
Terrain classification and adaptive locomotion for a hexapod robot Qingzhui
Yue ZHAO, Feng GAO, Qiao SUN, Yunpeng YIN
期刊论文
Strategy for robot motion and path planning in robot taping
Qilong YUAN,I-Ming CHEN,Teguh Santoso LEMBONO,Simon Nelson LANDÉN,Victor MALMGREN
期刊论文
A new efficient optimal path planner for mobile robot based on Invasive Weed Optimization algorithm
Prases K. MOHANTY,Dayal R. PARHI
期刊论文
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
期刊论文