FORCE COMPUTER SYS68K/CPU-40B/4-01 68040 25Mhz CPU, 4MB SHARED DRAM, ON-BD BATTE根据前面所述的定性指标与定量指标的价值量化结果,设评价模型中25个指标的隶属度为E=(ei,e,2,…,e25)(i=,2…,k;表示共有k个待评价的方案),各指标相总体目标的权重为w,-=)的大化问题,根据U(x)值的大小进行方案系统的总排序和择优,即:U(x)就是选定的佳方案。
3实例分析3.计算结果根据上述方法前述3类共8个方案进行综合评估分析,得到结果如表表各方案综合性能指标计算结果方案方案2方案3方案4方案5方案6方案7方案8综合性能A表23类方案中各自佳方案的性能比较性能指标方案4方案5方案6说明适应性方案5差动力性能差别不大机动性方案4差隐蔽性差别不大可靠性方案4差维修性方案4差经济性方案4差生命力差别不大技术风险方案4优3.2结果分析从总体上讲,方案6的综合性能指标的评估值是0.707 6是所有8个方案中优的。为了具体分析各方案的各项指标优劣情况,比较8个方案的各项指标的量化值可知,方案6的各项技术指标比较平均,没有明显的弱项,因此,其综合性能指标就优越。 传动系2.2.液力变矩器单单相三元件液力变矩器,使推土机输出扭矩的大小能自动适应载荷的变化,发动机进行过载保护,超负荷运行时发动机不熄火。
2.2.2行星变速器行星齿轮式动力换挡变速器,前进、后退各三挡,方向与速度的切换均通过控制阀来接合或分离箱内的五排摩擦片式离合器来实现,减少了换挡时间,提尚了变速效率。
2.2.3中央传动和转向离合器中央传动为螺旋锥齿轮。转向离合器为湿式、多片、弹簧压紧、液压分离。变速器的动力经中央传动分为左右两路,再通过左、右转向离合器传至终传动。
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