In this research paper,we have presented variable area type capacitive sensor signal conditioning system for angular displacement measurement and for this purpose we have used timer LM555 based astable multivibrator a...In this research paper,we have presented variable area type capacitive sensor signal conditioning system for angular displacement measurement and for this purpose we have used timer LM555 based astable multivibrator and universal frequency to digital converter (UFDC). Due to variation in angular displacement in the variable area type capacitor which is connected in the timer based astable circuit,capacitance changes which in turn changes the time period of the timer circuit output. The time period of the timer output waveform is linear with the capacitance and hence linear with angular displacement. The timer output is further processed with UFDC for the measurement. The experimental results show that the time period is linear with the angular displacement in the range of 0- 180° and the uncertainty we should associate it with this average time period value is the standard deviation of the mean,often called the standard error (SE),which is ± 0.023 μs. Because of the simplicity,this measurement system can be used in both electronic and industrial instrumentation.展开更多
为使电力推进变频驱动技术在船上得到更好的应用,在阐述规范对变频驱动电力推进系统谐波的要求的基础上,对风电安装船电力推进系统中多脉冲整流前端(Diode Front End,DFE)变频器和有源前端(Active Front End,AFE)变频器变频驱动技术的应...为使电力推进变频驱动技术在船上得到更好的应用,在阐述规范对变频驱动电力推进系统谐波的要求的基础上,对风电安装船电力推进系统中多脉冲整流前端(Diode Front End,DFE)变频器和有源前端(Active Front End,AFE)变频器变频驱动技术的应用,以及电网谐波干扰和抑制等问题进行分析。通过实例分析,为更好地掌握船舶电力推进变频驱动技术在应用过程中需注意的关键点提供参考。展开更多
文摘In this research paper,we have presented variable area type capacitive sensor signal conditioning system for angular displacement measurement and for this purpose we have used timer LM555 based astable multivibrator and universal frequency to digital converter (UFDC). Due to variation in angular displacement in the variable area type capacitor which is connected in the timer based astable circuit,capacitance changes which in turn changes the time period of the timer circuit output. The time period of the timer output waveform is linear with the capacitance and hence linear with angular displacement. The timer output is further processed with UFDC for the measurement. The experimental results show that the time period is linear with the angular displacement in the range of 0- 180° and the uncertainty we should associate it with this average time period value is the standard deviation of the mean,often called the standard error (SE),which is ± 0.023 μs. Because of the simplicity,this measurement system can be used in both electronic and industrial instrumentation.
文摘为使电力推进变频驱动技术在船上得到更好的应用,在阐述规范对变频驱动电力推进系统谐波的要求的基础上,对风电安装船电力推进系统中多脉冲整流前端(Diode Front End,DFE)变频器和有源前端(Active Front End,AFE)变频器变频驱动技术的应用,以及电网谐波干扰和抑制等问题进行分析。通过实例分析,为更好地掌握船舶电力推进变频驱动技术在应用过程中需注意的关键点提供参考。
