A sandwich plate with a corrugation and auxetic honeycomb hybrid core is constructed,and its sound insulation and optimization are investigated.First,the motion governing equation of the sandwich plate is established ...A sandwich plate with a corrugation and auxetic honeycomb hybrid core is constructed,and its sound insulation and optimization are investigated.First,the motion governing equation of the sandwich plate is established by the third-order shear deformation theory(TSDT),and then combined with the fluid-structure coupling conditions,and the sound insulation is solved.The theoretical results are validated by COMSOL simulation results,and the effects of the structural parameter on the sound insulation are analyzed.Finally,the standard genetic algorithm is adopted to optimize the sound insulation of the sandwich plate.展开更多
文章针对一起220 kV电容式电压互感器(Capacitive Voltage Transformer,CVT)二次电压异常故障进行分析。首先,对二次电压异常原因进行了全面分析;其次,基于红外测温发现CVT的电磁单元异常高温现象,进行介损、电容量测量和绝缘试验分析,...文章针对一起220 kV电容式电压互感器(Capacitive Voltage Transformer,CVT)二次电压异常故障进行分析。首先,对二次电压异常原因进行了全面分析;其次,基于红外测温发现CVT的电磁单元异常高温现象,进行介损、电容量测量和绝缘试验分析,发现该CVT的二次线缆表皮破损,进而导致二次回路产生短路电流和铁芯磁通饱和,最终导致避雷器击穿和次级绕组电压异常;最后,提出了预防CVT发生此类故障的措施。展开更多
基金Project supported by the National Natural Science Foundation of China (Nos. 12172339 and 11732005)the Beijing Natural Science Foundation of China (No. 1222006)。
文摘A sandwich plate with a corrugation and auxetic honeycomb hybrid core is constructed,and its sound insulation and optimization are investigated.First,the motion governing equation of the sandwich plate is established by the third-order shear deformation theory(TSDT),and then combined with the fluid-structure coupling conditions,and the sound insulation is solved.The theoretical results are validated by COMSOL simulation results,and the effects of the structural parameter on the sound insulation are analyzed.Finally,the standard genetic algorithm is adopted to optimize the sound insulation of the sandwich plate.
文摘文章针对一起220 kV电容式电压互感器(Capacitive Voltage Transformer,CVT)二次电压异常故障进行分析。首先,对二次电压异常原因进行了全面分析;其次,基于红外测温发现CVT的电磁单元异常高温现象,进行介损、电容量测量和绝缘试验分析,发现该CVT的二次线缆表皮破损,进而导致二次回路产生短路电流和铁芯磁通饱和,最终导致避雷器击穿和次级绕组电压异常;最后,提出了预防CVT发生此类故障的措施。
