![]() Using the developed view of the strand helix given in Figure 2-(a) the relationships between the length of rope S, length of strand S and the angle of strand r s rotation θ can be obtained. Centroidal axes of both strand and wire can be considered lying on right circular cylinders which can be developed into a plane as shown in Figure 2. The relative rotation will be positive for lang lay ropes and negative for regular lay ropes. It is considered to be important in characterizing the rope structure, specifically the relationship between the wire and strand helices, and is called the "relative rotation". This ratio is dependent on the angles of both helices and computed as a constant value for the model. d 0 The construction parameter η is a ratio of angle of double helical wire rotation to the angle of outer helical strand rotation. ![]() r is the distance along the double helical wire centerline and single helical d centerline and θ = ηθ + θ shows the rotation of the double helical wire around the d s d 0 single helical center wire of the outer strand, η is the construction parameter which shows the frequency of the wire along the helix length and θ is the wire phase angle.
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