http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Lewei (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Design and analysis of a gait rehabilitation cable robot with pairwise cable arrangement
Lewei Tang,Pengshuai Shi 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
A new design of gait rehabilitation robot using pairwise cables is proposed for post-stroke patients. Compared to conventional rehabilitation rigid-link robots, cable-driven robots enable alleviating discomfort of patients and relieving potential dangers from rigid robots. Four pairs of cables are connected to two cuffs mounted on a thigh and a shank of the same leg in parallelogram arrangement. Pairwise cable constraints the rotational degree of freedom around the normal of the cable plane in order to limit pathological human gait movement. A detailed mechanical design is illustrated and dynamics model of the gait rehabilitation robot is developed. Two robot configurations (i.e., fully constrained and under-constrained ones) are compared in terms of cable tensions, torque on the knee joint and the cable length. The simulation results reveal that under-constrained robot configuration is more suitable in the application of human gait rehabilitation training.
-
Jiayang Li,Lewei Tong,Jianming Wu,Yeming Pan 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8
The wind pressure distribution on the photovoltaic (PV) array is of great importance to the wind resistance design. The flow field related to the pressure can be influenced significantly by the turbulence induced by the building roof edge (Kopp et al., 2012) and it is essential to consider the building effect during the investigation. However, most CFD (computational fluid dynamics) investigations of wind pressure distribution on the PV array are limited to ground mounted PV array without the building. There is a necessity to extend the application of CFD method to flows around roof-mounted PV array. This study investigated the wind pressure distributions on PV arrays mounted on building roofs by means of Reynolds-averaged Navier–Stokes (RANS) approach using the FLUENT software. Since RANS models are sensitive to the flow condition, several RANS models are adopted and the most accurate RANS model for predicting this type of flow is identified based on a comparison with the wind tunnel experimental results. The SST k-ω model can predict the highest net mean wind uplift located at panels upstream accurately and is further applied for the parameter analysis to facilitate the installation of roof-mounted PV array. Numerical simulations of the wind flow field for wind angles between 0° to 180° were carried out at intervals of 20°, and the resulted net pressure distributions were presented. The influences of tilt angles of the PV array were investigated and the pressure distributions of PV panels were related to the flow field. Moreover, the effects of clearance between the PV array and building roof on the flow fields and pressure distributions of the PV array related to PV array tilt angle are studied.
-
Xiaoqiang Tang,Lewei Tang,Jinsong Wang,Dengfeng Sun 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.8
With the advantage of large workspace, low energy consumption and small inertia, the cable-driven parallel manipulator (CDPM) is suitable for heavy workpieces in rapid velocity and acceleration. We present a workspace analysis approach to solve force and torque equilibriums of completely restrained CDPMs. By this approach, not only the distribution but also the value of tensions driven by cables is investigated together. Two new indices, all cable tension distribution index (ACTDI) and area of the global quality workspace (AG)are proposed to evaluate the quality of the workspace. By concentrating on the workspace and its quality combined with the tension characteristics,these criteria are used to determine the optimal workspace in CDPMs. To verify the capacity of the proposed method, simulation examples are presented and the results demonstrate the approach’s effectiveness. In the end, the dimensional design for a planar CDPM is discussed with the indices of workspace quality.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
