Shackle

The Shackle component is used to define the orientation of the shackle with respect to the leaf eye on to which it is going to get mounted. It is only required if either of the eye hooks are not “Slider”.

Shackle Properties

The following section explains the options used in Shackle Properties.

Location: Defines the shackle location; either Rear or Front.
Type: Defines the type of the shackle; either Compression or Tension.
Mass: Defines the mass of the shackle.
Thickness: Defines the thickness of the shackle.
Length (Lss): Defines the shackle length.
Shackle center offset: Defines the offset distance between shackle center and eye hook center in property file units.

Note: It is used only when the ‘EYETOSHACKLELENGTH’ attribute is not given.

If the shackle center offset value is positive, then shackle will be oriented as shown in the following image:

Figure 2. Shackle Orientation for Positive Offset

If the shackle center offset value is negative, then shackle will be oriented as shown in the following image:

Figure 3. Shackle Orientation with Negative Offset

Inertia Ixx: Defines the second moment of inertia about X direction of the shackle.
Inertia Iyy: Defines the second moment of inertia about Y direction of the shackle.
Inertia Izz: Defines the second moment of inertia about Z direction of the shackle.
Mounting Length (L_CC): Defines the distance between the shackle center and the far eye center.
Bushing: By selecting the bushing option, a new Shackle Bushing option is displayed. The Shackle Bushing drop-down menu lists all of the bushings that are added in the Bushings Component.
Figure 4. Shackle Bushing

L_CC = eye to shackle length.

L_EE = eye to eye distance of master leaf.

L_SS = shackle length.

Note: L_CC< L_EE +L_SS

Shackle Properties for Leaf Property File (*lpf)

In the Shackle Properties block of Leaf Property file, the attribute, type, and valid value to be entered in TiemOrbit file format are detailed in the following table. This table also provides information about the mandatory requirements for attributes.

An example of how an Shackle Properties block is represented in a TiemOrbit file format is shown below:

$-----------------------------------------SHACKLE
[SHACKLE]
SHACKLELOCATION = ‘REAR’
SHACKLETYPE = ‘COMPRESSION’
SHACKLEMASS = 1
SHACKLETHICKNESS = 15
SHACKLEINERTIAIXX = 500
SHACKLEINERTIAIYY = 500
SHACKLEINERTIAIZZ = 500
SHACKLELENGTH = 105
SHACKCENTEROFFSET = 20
EYETOSHACKLELENGTH = 1418

Block Name = ‘Shackle’ (Required)


Attributes	Type	Valid Value	Required
shackleLocation	String	‘REAR’, FRONT	Yes
shackleType	String	‘COMPRESSION’, ‘TENSION’	Optional
shackleMass	Real	-	Yes
shackleThickness	Real	-	Yes
shackleInertiaIXX	Real	-	Yes
shackleInertiaIYY	Real	-	Yes
shackleInertiaIZZ	Real	-	Yes
shackleLength	Real	-	Yes
shackleCenterOffset	Real	-	Optional
eyeToShackleLength	Real	-	Optional