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基于DSP的冲床装模高度监控系统研究 被引量:1
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作者 于小宁 杨建华 +1 位作者 郭浩 许应康 《陕西科技大学学报(自然科学版)》 2010年第4期88-91,共4页
针对人工调整冲床装模高度过程中存在的误差较大、误操作和调模时间长等问题,提出了基于DSP的装模高度监控系统,利用高精度直线位移传感器对装模高度进行检测,通过人工编程实现了实时调整装模高度.经实际应用表明,整个调模时间可以减少5... 针对人工调整冲床装模高度过程中存在的误差较大、误操作和调模时间长等问题,提出了基于DSP的装模高度监控系统,利用高精度直线位移传感器对装模高度进行检测,通过人工编程实现了实时调整装模高度.经实际应用表明,整个调模时间可以减少50%,控制精度达到了0.01 mm,有效的提高了生产效率,具有很好的实际意义. 展开更多
关键词 DSP 调模时间 监控系统 高度
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Selection model of trip time for rural population 被引量:2
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作者 冯忠祥 袁华智 +2 位作者 刘静 高璇 张卫华 《Journal of Central South University》 SCIE EI CAS 2013年第1期274-278,共5页
Referring to the 1 248 survey data of rural population in 14 provinces of China, the influencing factors of trip time choice were analyzed. Based on the basic theory of disaggregate model and its modelling method, nin... Referring to the 1 248 survey data of rural population in 14 provinces of China, the influencing factors of trip time choice were analyzed. Based on the basic theory of disaggregate model and its modelling method, nine grades were selected as the alternatives of trip time, the variables affecting time choice and the method getting their values were determined, and a multinomial logit (MNL) model was developed. Another 1 200 trip data of rural population were selected to testify the model's validity. The result shows that the maximum absolute error of each period between calculated value and statistic is 3.6%, so MNL model has high calculation accuracy. 展开更多
关键词 traffic planning rural population trip time disaggregate model multinominal logit (MNL) model
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