A novel three-dimensional-fiber reinforced soft pneumatic actuator(3D-FRSPA)inspired by crab claw and human hand structure that can bend and deform independently in each segment is proposed.It has an omni-directional ...A novel three-dimensional-fiber reinforced soft pneumatic actuator(3D-FRSPA)inspired by crab claw and human hand structure that can bend and deform independently in each segment is proposed.It has an omni-directional bending configuration,and the fibers twined symmetrically on both sides to improve the bending performance of FRSPA.In this paper,the static and kinematic analysis of 3D-FRSPA are carried out in detail.The effects of fiber,pneumatic chamber and segment length,and circular air chamber radius of 3D-FRSPA on the mechanical performance of the actuator are discussed,respectively.The soft mobile robot composed of 3D-FRSPA has the ability to crawl.Finally,the crawling processes of the soft mobile robot on different road conditions are studied,respectively,and the motion mechanism of the mobile actuator is shown.The numerical results show that the soft mobile robots have a good comprehensive performance,which verifies the correctness of the proposedmodel.This work shows that the proposed structures have great potential in complex road conditions,unknown space detection and other operations.展开更多
Nature reserves are key sites for ecotourism.In the context of sustainable development,a great number of ecotourism practices have been carried out in nature reserves around the world.Important ecotourism practices in...Nature reserves are key sites for ecotourism.In the context of sustainable development,a great number of ecotourism practices have been carried out in nature reserves around the world.Important ecotourism practices in nature reserves include the establishment of ecotourism certification systems,the development of management mechanisms promoting effective community participation and the development of standards for ecotourism practices.This paper uses questionnaires,a field investigation and interviews to examine the obstacles influencing the sustainable development of ecotourism in nature reserves,taking three nature reserves in Liaoning Province to serve as examples.The study found that there are two kinds of obstacles to the sustainable development of ecotourism in nature reserves.The first group of obstacles all represent common problems in China including:(1)environmental education is ignored;(2)community participation occurs on an ad hoc basis;(3)tourism management is not rigorous;(4)nature reserve administration is in a state of confrontation with local governments and residents.The second group of obstacles consists of specific problems faced by ecotourism in the three nature reserve,each of which has its own natural,social,cultural and economic environment that generate unique difficulties for ecotourism.In order to promote the healthy improvement of nature reserve ecotourism and achieve the goal of sustainable development,the research team puts forward five suggestions,developing correct understanding,striving to meet the reasonable demands of stakeholders,establishing scientific mechanisms,increasing the social responsibility of management departments of nature reserve ecotourism,and providing separate supervision and management.展开更多
In order to achieve a wheelchair climb stairs function, this paper designs a star-wheel stair-climbing mechanism. Through the effect of the lock coupling, the star-wheel stair-climbing mechanism is formed to be fixed ...In order to achieve a wheelchair climb stairs function, this paper designs a star-wheel stair-climbing mechanism. Through the effect of the lock coupling, the star-wheel stair-climbing mechanism is formed to be fixed axis gear train or planetary gear train achieving flat-walking and stair-climbing functions. Crossing obstacle analysis obtains the maximum height and minimum width of obstacle which the wheelchair can cross. Stress-strain analysis in Solidworks simulation is performed to verify material strength.展开更多
基金work is supported by the Fundamental Research Funds for the Central Universities(Grant No.B230205021)the Postgraduate Research&Practice Innovation Program of Jiangsu Province,China(GrantNo.KYCX22_0592).The financial supports are gratefully acknowl-edged.
文摘A novel three-dimensional-fiber reinforced soft pneumatic actuator(3D-FRSPA)inspired by crab claw and human hand structure that can bend and deform independently in each segment is proposed.It has an omni-directional bending configuration,and the fibers twined symmetrically on both sides to improve the bending performance of FRSPA.In this paper,the static and kinematic analysis of 3D-FRSPA are carried out in detail.The effects of fiber,pneumatic chamber and segment length,and circular air chamber radius of 3D-FRSPA on the mechanical performance of the actuator are discussed,respectively.The soft mobile robot composed of 3D-FRSPA has the ability to crawl.Finally,the crawling processes of the soft mobile robot on different road conditions are studied,respectively,and the motion mechanism of the mobile actuator is shown.The numerical results show that the soft mobile robots have a good comprehensive performance,which verifies the correctness of the proposedmodel.This work shows that the proposed structures have great potential in complex road conditions,unknown space detection and other operations.
基金The National Natural Science Foundation of China(41301137)
文摘Nature reserves are key sites for ecotourism.In the context of sustainable development,a great number of ecotourism practices have been carried out in nature reserves around the world.Important ecotourism practices in nature reserves include the establishment of ecotourism certification systems,the development of management mechanisms promoting effective community participation and the development of standards for ecotourism practices.This paper uses questionnaires,a field investigation and interviews to examine the obstacles influencing the sustainable development of ecotourism in nature reserves,taking three nature reserves in Liaoning Province to serve as examples.The study found that there are two kinds of obstacles to the sustainable development of ecotourism in nature reserves.The first group of obstacles all represent common problems in China including:(1)environmental education is ignored;(2)community participation occurs on an ad hoc basis;(3)tourism management is not rigorous;(4)nature reserve administration is in a state of confrontation with local governments and residents.The second group of obstacles consists of specific problems faced by ecotourism in the three nature reserve,each of which has its own natural,social,cultural and economic environment that generate unique difficulties for ecotourism.In order to promote the healthy improvement of nature reserve ecotourism and achieve the goal of sustainable development,the research team puts forward five suggestions,developing correct understanding,striving to meet the reasonable demands of stakeholders,establishing scientific mechanisms,increasing the social responsibility of management departments of nature reserve ecotourism,and providing separate supervision and management.
基金Supported Special Topic of the Ministry of Education about Humanities and Social Sciences of China(12JDGC007)University Natural Science Research Projects of Anhui Province(KJ2011ZD01)Science and Technology Research Project of Anhui Province(1301022052)
文摘In order to achieve a wheelchair climb stairs function, this paper designs a star-wheel stair-climbing mechanism. Through the effect of the lock coupling, the star-wheel stair-climbing mechanism is formed to be fixed axis gear train or planetary gear train achieving flat-walking and stair-climbing functions. Crossing obstacle analysis obtains the maximum height and minimum width of obstacle which the wheelchair can cross. Stress-strain analysis in Solidworks simulation is performed to verify material strength.
