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首页> 外文期刊>British Corrosion Journal >Ship impressed current cathodic protection - modulations of system current outputs by propeller/shaft rotation on physical scale model hull
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Ship impressed current cathodic protection - modulations of system current outputs by propeller/shaft rotation on physical scale model hull

机译：船用外加电流阴极保护-物理比例模型船体上螺旋桨/轴旋转对系统电流输出的调制

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摘要

Physical scale modelling was employed to examine the effect of propeller/shaft rotation on the current outputs of ship impressed current cathodic protection (ICCP). When a one-hundredth scale metal hull was protected in diluted sea water, propeller rotation produced low frequency modulations of output. Two propellers rotating resulted in two sinusoidal frequencies, the higher frequency carrier' being amplitude modulated by a lower frequency envelope. There was only the 'carrier' waveform present when only one propeller was rotated. The 'carrier' frequency (4.67~0.83 Hz) was related to the speed of shaft rotation and was apparently determined by the faster propeller. Envelope frequencies (0.48 and 0.42 Hz) corresponded to differences in speed of the two propellers. Possible causes of this corrosion control phenomenon are proposed, together with the requirement for further experimental investigation and waveform analysis.
机译：物理比例模型用于检查螺旋桨/轴旋转对舰船外加电流阴极保护（ICCP）电流输出的影响。当用稀释的海水保护一百分之一比例的金属船体时，螺旋桨旋转会产生输出的低频调制。两个螺旋桨旋转产生两个正弦频率，较高频率的载波由较低的频率包络进行幅度调制。当仅旋转一个螺旋桨时，仅存在“载波”波形。 “载波”频率（4.67〜0.83 Hz）与轴的旋转速度有关，显然是由更快的螺旋桨确定的。包络频率（0.48和0.42 Hz）对应于两个螺旋桨速度的差异。提出了这种腐蚀控制现象的可能原因，以及对进一步实验研究和波形分析的要求。

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