Anchor  Mode I Bas i n Mode I Anchor

Fig。6 Transverse  Inclination  of  Bottom Surface

pulling distance

Fig。7 Model Curve of  Resistance  Force

3。Experimental Results

Fig。8 shows the holding resistance of 3 anchors。" )(2) These experimental conditions are horizontal towing, 0 degree initial pulling direction and flat bottom surface。 The effect of pulling speed is not so much。 The holding resistance of AC-14 type and DA-I type anchors is higher than JIS type anchor。 Fig。9 shows the holding resistance of 3 anchors。 These experimental conditions are 20 degrees’ pulling angle。 At this condition the effect of pulling speed is also not so much。 The holding resistance of JIS type anchor is little bit smaller than the other anchors。 Fig。 10 shows the typical experimental result of AC-14 type and DA- I anchor。 Maximum holding resistance is almost same value each other, but the sustainability of high holding resistance is different。文献综述

Fig。9 Effect of Pulling Speed (Pulling Angle 20 degrees)

Fig。10 Comparison  of Stability

Fig。 11 shows the holding resistance which is affected initial pulling directions。 From this figure it was shown that holding resistance decreases according with the increase of initial pulling direction by the reason that the fluke of anchor could not extend by the penetration of sand in the anchor crown。 Fig。 12 shows the effect of fluke angle。 Fig。 13, 14 and 15 show the effect of transverse inclination of bottom surface。 In this condition the effect was not so severe in the case of both anchors。 But in the case of JIS type stability is not so good。 This type is overturning so soon。

In these figures, the relation between holding resistance and coefficient is as follows。 holding resistance coefficient = holding resistance (force) / anchor weight in air 一种叫做DA-1的锚已经被研发出来了，东京船海科技大学的航海技术专科学院已经在船模试验池中进行了模型试验。试验结果和JIS型锚具和AC-14型锚具进行了比较。就水平拉力而言，AC-14型锚展现出了几种锚中的最大抓力

在这个实验中，作者可意展示出三种新型锚（DA-1）在高持续性抓力方面的高性能，这结果的依据取决于锚性能的过载情况。AC-14锚比DA-1型锚更易过载，同水平拉力实验中牵引力相比没，在180度的拉力方向上，锚具铰链上的角没有被沙子完全充实。同样的，锚具底面横截面的倾向效应被测试过，它同平底相比抓力性能会下降。

关键词：锚具，抓力，船模试验池来;自]优Y尔E论L文W网www.youerw.com +QQ752018766-

1。锚模型

如图1，测试了三种锚，分别是JIS型，AC-14型和DA-1型

图2展示了这三种锚的锚冠区别，实验用锚的尺寸如图1所示。该表中，长度表示平行于柄的最大尺寸，宽度表示垂直于锚柄方向的最大尺寸。

2．试验设备和实验条件

船锚试验池如图3所示，该图显示了水平牵引力情况，图示4显示了20度牵引力情形，初始牵引力方向不仅有0度，还有90度方向和180度方向，这些情形都如图5所示。

图6显示了底部表面横截面倾向情形，图7展示了试验结果例子，作者分析了最大阻力，该表格并不是实际结果，但是表现了抓力阻力的典型模式。