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.


Figure 1. Shackle Properties Options
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 (LCC)
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


Figure 5. Shackle Geometry Triangle

LCC = eye to shackle length.

LEE = eye to eye distance of master leaf.

LSS = shackle length.
Note: LCC < LEE +LSS

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