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Stellar House Science, Inc.

internet data systems
towed systems simulation

Users Manual:

Index Body and Cable Effects
Page 1 Body and Cable Effects
Page 2 General Towing Configuration
Page 3 Cable Element Details
Page 4 Cable Elasticity
Page 5 External Forces
Page 6 External Forces (continued)

Figure 2-1:

General towing configuration showing a 2-part tow with 2 cable segments, 1 tow-point, and 2 bodies.Constraint (Body) Characteristics Mass, Buoyancy Force, Drag Forces (X,Y dirs), Cross-coupling forces (X,Y dirs).* Thrust Forces (X, Y dirs.)** Towpoint Characteristics only property is velocity.

Towpoint V is an independent variable (boundary condition) which is unaffected by other constraints. Not required for analysis.

* Forces in direction perpendicular to the direction defining the force(i.e. vertical on a wing due to horizontal speed)

** In bodies such as ROVs or weighted/winged bodies such as some towfish.

Cable seg. 1: First cable. Divided into elements during analysis. An N-element cable segnemt has N+1 nodes.Nodes 1 and N+1 are connected to bodies and/or towpoints depending on user input.

Cable segment 2: Second cable Towpoint 1: Ship A-frame or anchor Body 2: Second towed body. Mass, Vertical Drag Horizontal Drag, Buoyancy.

Body 1: First towed body (near-neutrally buoyant sphere. A body may be connected to 1 to K cable segments. K = number of segments.

Cable Characteristics: Number of elements per segment, Mass, Buoyancy , Elasticity Normal Tangential drag forces Coefficient of Friction Impact Elasticity

Three types of objects used in the model created by CABLE SOLUTION: