Lever
Leverage.
Description
Block Lever represents the mechanical lever in its general form. The application of forces is shown in the diagram below.
The lever equations are given for negligible angular deviation from the initial position:
where
-
- are the velocities of the knots.
-
- are the forces applied to the nodes.
-
- the arms of the lever.
The above equations are derived under the assumption that the lever summarises the forces and displacements at node C. This assumption is arbitrary and does not impose any restrictions on how forces or displacements are applied to the lever. In other words, any of the nodes in the lever can be an input or output node, depending on the magnitude of the force. Furthermore, any of the nodes in the block can be connected to a fulcrum, thus turning a three-node lever into a first-type lever (with a fulcrum in the middle) or a second-type lever (with a fulcrum at one end).
The following figure shows a diagram of a lever of the first kind with a fulcrum in the centre.
It is described by the following equations:
The following figure shows a diagram of a lever of the second kind with a fulcrum at node A.
It is described by the following equations:
Absolute node offsets are assumed to be positive if they correspond to a globally specified positive direction.
Ports
A - lever node A
translational mechanics.
Mechanical progressive port, corresponds to node A.
B - lever node B
` translational mechanics`.
Mechanical progressive port, corresponds to node B.
C - lever node C
` translational mechanics`.
Mechanical progressive port, corresponds to node C.
Parameters
AC arm length, m - arm length between nodes A and C
0.1 m (by default)
Arm length between nodes A and C.
BC arm length, m - arm length between nodes B and C
0.1 m (By default).
Arm length between nodes B and C.
Initial value of force at A, N - initial value of force at point A
`0.0 (By default)
Initial value of force at point A.
Initial value of force at B, N - initial value of force at point A
`0.0 (By default).
Initial value of force at point B.
Initial value of force at C, N - initial value of force at point A
0.0 (By default)
Initial value of force at point C.