目的从人因工程的理论角度出发,利用表面肌电信号(Electromyography,EMG)对用户长时间使用手持式推杆清洁电器所诱发的肌肉疲劳进行检测和评价,从而形成一种可广泛应用于清洁电器人机交互界面舒适性评估的通用量化方法。方法选取5台不...目的从人因工程的理论角度出发,利用表面肌电信号(Electromyography,EMG)对用户长时间使用手持式推杆清洁电器所诱发的肌肉疲劳进行检测和评价,从而形成一种可广泛应用于清洁电器人机交互界面舒适性评估的通用量化方法。方法选取5台不同界面设计的手持式推杆吸尘器样机,采用5×5×5被试内设计采集不同样机模拟清洁任务下用户4组肌电特征参数:积分肌电(Integral Electromyography,IEMG)、均方根振幅(Root Mean Square,RMS)、平均功率频率(Mean Power Frequency,MPF)以及中值频率(Middle Frequency,MF)。通过双因素重复测量方差分析法(Two-way repeated-measures ANOVA)分析各肌电参数随时间和样机两个因素的变化特性。结果(1)肱二头肌上的肌电活动对疲劳最为敏感,证实IEMG、RMS、MPF、MF可以作为手持式推杆清洁电器任务过程中肌肉疲劳评价的有效指标;(2)5台样机的交互舒适性体验水平依次为:样机2>样机3>样机1>样机4>样机5。结论本研究成果可作为一种通用量化的方法应用到手持推杆式清洁电器人机交互界面舒适性评估,为后期产品界面设计和迭代优化评估提供理论依据。展开更多
More than 80 million metric tons of fly ash is produced annually in the U.S. as coal combustion by-product. Coal fly ash can be converted to value-added products if unburned carbon is reduced to less than 2.5%. Howeve...More than 80 million metric tons of fly ash is produced annually in the U.S. as coal combustion by-product. Coal fly ash can be converted to value-added products if unburned carbon is reduced to less than 2.5%. However, most of fly ash is currently landfilled as waste due to lack of efficient purification technologies to separate unburned carbon from fly ash. A rotary triboelectrostatic separator has been developed and patented recently at the University of Kentucky with unique features. Several fly ash samples have been used to understand the effects of major process parameters on the separation performance. The results show that compared to existing triboelectrostatic separators, the rotary triboelectrostatic separator has significant advantages in particle charging efficiency, solids throughput, separation efficiency, applicable particle size range.展开更多
文摘目的从人因工程的理论角度出发,利用表面肌电信号(Electromyography,EMG)对用户长时间使用手持式推杆清洁电器所诱发的肌肉疲劳进行检测和评价,从而形成一种可广泛应用于清洁电器人机交互界面舒适性评估的通用量化方法。方法选取5台不同界面设计的手持式推杆吸尘器样机,采用5×5×5被试内设计采集不同样机模拟清洁任务下用户4组肌电特征参数:积分肌电(Integral Electromyography,IEMG)、均方根振幅(Root Mean Square,RMS)、平均功率频率(Mean Power Frequency,MPF)以及中值频率(Middle Frequency,MF)。通过双因素重复测量方差分析法(Two-way repeated-measures ANOVA)分析各肌电参数随时间和样机两个因素的变化特性。结果(1)肱二头肌上的肌电活动对疲劳最为敏感,证实IEMG、RMS、MPF、MF可以作为手持式推杆清洁电器任务过程中肌肉疲劳评价的有效指标;(2)5台样机的交互舒适性体验水平依次为:样机2>样机3>样机1>样机4>样机5。结论本研究成果可作为一种通用量化的方法应用到手持推杆式清洁电器人机交互界面舒适性评估,为后期产品界面设计和迭代优化评估提供理论依据。
文摘More than 80 million metric tons of fly ash is produced annually in the U.S. as coal combustion by-product. Coal fly ash can be converted to value-added products if unburned carbon is reduced to less than 2.5%. However, most of fly ash is currently landfilled as waste due to lack of efficient purification technologies to separate unburned carbon from fly ash. A rotary triboelectrostatic separator has been developed and patented recently at the University of Kentucky with unique features. Several fly ash samples have been used to understand the effects of major process parameters on the separation performance. The results show that compared to existing triboelectrostatic separators, the rotary triboelectrostatic separator has significant advantages in particle charging efficiency, solids throughput, separation efficiency, applicable particle size range.
