为解决驻极体过滤材料普遍存在静电衰减的问题,并使过滤材料在使用中能长效带静电,选取了具有导电性能的非织造材料作为研究对象,通过改装过滤测试装置,用外加电压对导电过滤材料施加静电,并对过滤效率与所加静电的关系进行了分析。研...为解决驻极体过滤材料普遍存在静电衰减的问题,并使过滤材料在使用中能长效带静电,选取了具有导电性能的非织造材料作为研究对象,通过改装过滤测试装置,用外加电压对导电过滤材料施加静电,并对过滤效率与所加静电的关系进行了分析。研究结果表明：在相对较小（0~7 k V）的电压变化范围内,试样的过滤阻力基本不变,而且过滤效率最大可提高26.1%,同时过滤效率与电压值近似一种线性关系;非导电的涤纶针刺织物在强制静电下的过滤效率也会提高,但增长速率不及导电纤维材料;静电吸附能有效提高过滤效率并且不影响过滤阻力,为过滤材料中产业应用提供参考。展开更多
Structure of the octagon-type ultrasonic motor was proposed and designed so as to allow the motor to drive small actuator. The stator of the motor consisted of the octagon shape elastic body and four rectangular plate...Structure of the octagon-type ultrasonic motor was proposed and designed so as to allow the motor to drive small actuator. The stator of the motor consisted of the octagon shape elastic body and four rectangular plate ceramics. The four ceramics were attached to outer surfaces of the octagon elastic body. The same phase voltages were applied to the ceramics on horizontal surfaces, and 90° phase difference voltages were applied to the ceramics on vertical surfaces. When the AC voltage with 90° phase difference was applied in ceramics, the elliptical displacement of unimorph bars was generated by generating bending vibration. To find the maximum displacement model that generates elliptical displacement at the centers of the inner surfaces, the finite element analysis program ATILA was used. The analyzed results were compared to the experimental results. As a result, the speed and torque are increased linearly by increasing the input voltage and the speed of motors can be controlled by changing the applied voltages.展开更多
文摘为解决驻极体过滤材料普遍存在静电衰减的问题,并使过滤材料在使用中能长效带静电,选取了具有导电性能的非织造材料作为研究对象,通过改装过滤测试装置,用外加电压对导电过滤材料施加静电,并对过滤效率与所加静电的关系进行了分析。研究结果表明：在相对较小（0~7 k V）的电压变化范围内,试样的过滤阻力基本不变,而且过滤效率最大可提高26.1%,同时过滤效率与电压值近似一种线性关系;非导电的涤纶针刺织物在强制静电下的过滤效率也会提高,但增长速率不及导电纤维材料;静电吸附能有效提高过滤效率并且不影响过滤阻力,为过滤材料中产业应用提供参考。
基金Project supported by the Second Stage of Brain Korea 21 Projectssupported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MEST) [No.2011-0030806]
文摘Structure of the octagon-type ultrasonic motor was proposed and designed so as to allow the motor to drive small actuator. The stator of the motor consisted of the octagon shape elastic body and four rectangular plate ceramics. The four ceramics were attached to outer surfaces of the octagon elastic body. The same phase voltages were applied to the ceramics on horizontal surfaces, and 90° phase difference voltages were applied to the ceramics on vertical surfaces. When the AC voltage with 90° phase difference was applied in ceramics, the elliptical displacement of unimorph bars was generated by generating bending vibration. To find the maximum displacement model that generates elliptical displacement at the centers of the inner surfaces, the finite element analysis program ATILA was used. The analyzed results were compared to the experimental results. As a result, the speed and torque are increased linearly by increasing the input voltage and the speed of motors can be controlled by changing the applied voltages.
