三轮运输车发动机悬置系统的设计

针对三轮运输车行驶平顺性较差的问题,根据试验样车的结构特点,提出悬浮式发动机悬置系统设计方案,系统介绍了该悬置系统的结构特点,并对发动机悬置系统设计中的几个关键问题进行探讨,试验结果表明所设计的发动机悬置系统具有良好的隔振效果。     

The bricycle: a bicycle in zero gravity can be balanced or steered but not both

A bicycle or inverted pendulum can be balanced, that is kept nearly upright, by accelerating the base. This balance is achieved by steering on a bicycle. Simultaneously one can also control the lateral position of the base: changing of the track line of a bike or the position of hand under a balanced stick. We show here with theory and experiment that if the balance problem is removed, by making the system neutrally stable for balance, one cannot simultaneously maintain balance and control the position of the base. We made a bricycle, essentially a bicycle with springy training wheels. The stiffness of the training wheel suspension can be varied from near infinite, making the bricycle into a tricycle, to zero, making it effectively a bicycle. The springy training wheels effectively reduce or even negate gravity, at least for balance purposes. One might expect a smooth transition from tricycle to bicycle as the stiffness is varied, in terms of handling, balance and feel. Not so. At an intermediate stiffness, when gravity is effectively zeroed, riders can balance easily but no longer turn. Small turns cause an intolerable leaning. Thus there is a qualitative difference between bicycles and tricycles, a difference that cannot be met halfway.     

我国三轮车产业的发展趋势

国内三轮车产业的发展已到瓶颈期,微型新能源车将是它未来良好的选择。文中,从三轮车现状出发,首先研究其受市场欢迎的原因;其后,分析了其在使用、性能改进、成本降低方面的局限;再次,揭示其在电动车发展上的垫脚石作用和未来发展方向;最后,对其未来发展提出合理建议。     

对L县电动三轮车及出租车的对比分析

本文尝试从需求定律和产权界定两个角度对L县出租车和三轮车运营进行比较分析,并探讨可能的发展方向。由于出租车问题十分复杂,受能力所限,本文仅针对L县出租车与三轮车之间的利益纠纷问题,参照一般分析框架进行简单对比分析。本文所称三轮车指封闭式电动载客三轮车,多无严格生产标准。     

市场经济中政府规制行为的选择--以解决城市"机动三轮车"运营问题为案例

在我国的大中城市中,机动三轮车运营现象普遍存在。对这些车辆,尤其是在一些大城市中,政府有关部门千方百计地试图加以消灭,可是屡战屡败,而这些运营车辆却生意十分兴隆。为什么会出现这种现象?这种现象怎么会长期存在?本文通过对沈阳市机动三轮车运营情况的实际调查并利用经济博弈论进行一个初步的分析。