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As a typical representative of service robots for the elderly and the disabled, intelligent wheelchair have strong environmental adaptability, safe and stable motion performance, and intelligent interaction methods. They are an indispensable tool in social rehabilitation projects. For ordinary wheelchairs, most of them allow the rider to sit down slowly, but for those riders who have a back disease or need assistance to sit down, ordinary wheelchairs are not convenient to ride. Therefore, this article aims to improve the portability of wheelchairs for people with back problems. We propose a novel wheelchair based on the elevating lazyback, a new structure that can adjust lazyback angle quickly and flexibly. Different with the traditional wheelchair, the rider has the ability to get into the wheelchair from bed and sofa without others helped. we carry out the modeling and simulation of a new structure with the help of two kind of software, i.e. the MATLAB and the ANSYS. The results show that the proposed wheelchair has a good kinematic performance and well-feasibility, which means that the wheelchair can be used in the daily life

1073 cheng shen

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