Dyads do not change the number of Degrees-of-Freedom of a kinematic-chain. If the kinematic-chain has Green Part-Outlines before you add the Dyad, it should have Green Part-Outlines after To show you how to add this Dyad, we have two design cases.
In the RRP Dyad there are : two Pin-Joints, one Slide-Joint, and two Parts. I follow a consistent three-step procedure. General Three-Step Procedure to add a Dyad
Note: This Dyad is not 'symmetrical'. The 'P' joint could be joined to the Motion-Part or the 'other' kinematically-defined Part. In the two examples below, the 'P' joint is joined to the Base-Part.
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CASE 1: |
CASE 2: |
Examples |
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Preparation: Two Kinematically Defined Parts:
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Step 1: New Parts Add two Parts. |
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Step 2: 'Outer' Joints Add the two 'outer' Joints (R-P Joints). In this case, a:
The two Joints are the two 'outer' Joints of the Dyad: R-P |
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Step 3: 'Inner' Joints Connect the two new parts together with a Pin-Joint The Kinematic-Chain becomes Kinematically Defined again with an RRP Dyad. Note: For clarity, I have added Lines to the Sliding-Parts to offset the Pin-Joints from Sliding-Parts. |
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Kinematics-Tree Shows the original Rocker or Slider, plus the new RRP Dyad. |