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Method of estimating frictional resistance of ship bottom coating film, and a method of evaluating coating film performance using said method and a device for evaluating coating film performance
Method of estimating frictional resistance of ship bottom coating film, and a method of evaluating coating film performance using said method and a device for evaluating coating film performance
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机译:船底涂膜的摩擦阻力的估计方法,使用该方法的涂膜性能的评价方法以及涂膜性能的评价装置
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摘要
A method of estimating a frictional resistance of a ship bottom coating film, the method including measuring any one of Rz (maximum height roughness), Rc (mean height of roughness profile elements), Ra (arithmetic mean roughness), Rq (root mean square roughness) and RZJIS (ten-point mean roughness) as a roughness height R in a mean length RSm of roughness profile elements in the range of 2,000 to 10,000 μm according to JIS B 0601:2001 (ISO4287:1997) on a coating film formed by applying a ship bottom coating paint on a substrate and calculating a frictional resistance increase rate FIR (%) from a mirror surface by the following formula (1), wherein coefficient C is a constant depending on the kind of the roughness height R and a frictional resistance testing method, and is previously determined in such a manner that plural ship bottom coating films each having different roughness are subjected to a roughness measurement and a frictional resistance test in a definite evaluation length, and then the coefficient C is determined by the formula (1) using the roughness height R, the mean length RSm of roughness profile elements and the frictional resistance increase rate FIR (%), which have been measured.
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机译:一种估算船底涂膜摩擦阻力的方法,该方法包括测量Rz(最大高度粗糙度),Rc(粗糙度轮廓元素的平均高度),Ra(算术平均粗糙度),Rq(均方根)中的任何一个粗糙度)和RZJIS(十点平均粗糙度),根据JIS B 0601:2001(ISO4287:1997)在所形成的涂膜上的粗糙度轮廓元素的平均长度RSm中的粗糙度高度R在2,000至10,000μm范围内通过将船底涂料涂在基底上并通过以下公式(1)从镜面计算出摩擦阻力增加率FIR(%),其中系数C是取决于粗糙度高度R和a的种类的常数。摩擦阻力测试方法,并且事先以如下方式确定:对具有不同粗糙度的多个船底涂膜进行一定的评估长度的粗糙度测量和摩擦阻力测试,然后,使用已测量的粗糙度高度R,粗糙度轮廓元素的平均长度RSm和摩擦阻力增加率FIR(%),由公式(1)确定系数C。
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