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浅析农用三轮车事故原因
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作者 王旭民 邓睿麟 《农业机械化与电气化》 2003年第4期38-38,共1页
在市场经济的大潮中,农民不仅把眼光放在土地上而且瞄准了市场,向运输业大力发展.近年来蔬菜大棚的蓬勃兴起,带动了农用运输车的大力发展,使各地的农用运输车数量迅速增加.这种车型以省油、转向灵活、速度快捷而很快占领了农村运输市场... 在市场经济的大潮中,农民不仅把眼光放在土地上而且瞄准了市场,向运输业大力发展.近年来蔬菜大棚的蓬勃兴起,带动了农用运输车的大力发展,使各地的农用运输车数量迅速增加.这种车型以省油、转向灵活、速度快捷而很快占领了农村运输市场.虽然生产企业经过几年的技术改造,但是因为其底盘轻、三点支撑车身设计和现有农村路面状况不好等原因还是经常发生事故.现对其事故原因进行分析. 展开更多
关键词 农用三轮车事故 原因分析 车速 重力平衡性 驾驶员操作 牌证管理
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Human-machine compatibility and dynamic analysis of a novel unpowered and self-adaptive shoulder rehabilitation exoskeleton 被引量:3
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作者 Zhang Jingwen Jia Minping 《Journal of Southeast University(English Edition)》 EI CAS 2020年第2期138-144,共7页
To reduce the complexity of the configuration and control strategy for shoulder rehabilitation exoskeleton,a 2R1R1P2R serial of shoulder exoskeleton based on gravity balance is proposed.Based on three basic rotatory s... To reduce the complexity of the configuration and control strategy for shoulder rehabilitation exoskeleton,a 2R1R1P2R serial of shoulder exoskeleton based on gravity balance is proposed.Based on three basic rotatory shoulder joints,an exact kinematic constraint system can be formed between the exoskeleton and the upper arm by introducing a passive sliding pair and a center of glenohumeral(CGH)unpowered compensation mechanism,which realizes the human-machine kinematic compatibility.Gravity balance is used in the CGH compensation mechanism to provide shoulder joint support.Meanwhile,the motion of the compensation mechanism is pulled by doing reverse leading through the arm to realize the kinematic self-adaptive,which decreases control complexity.Besides,a simple and intuitive spring adjustment strategy is proposed to ensure the gravity balance of any prescribed quality.Furthermore,according to the influencing factors analysis of the scapulohumeral rhythm,the kinematic analysis of CGH mechanism is performed,which shows that the mechanism can fit the trajectory of CGH under various conditions.Finally,the dynamic simulation of the mechanism is carried out.Results indicate that the compensation torques are reduced to below 0.22 N·m,and the feasibility of the mechanism is also verified. 展开更多
关键词 REHABILITATION EXOSKELETON human-machine compatibility kinematic analysis gravity balance
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