7.7 MECHANICAL SYSTEM
 
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·
 System description
·
 Introduction
·
 Model
·
 View
   
 
   
Fig. 7.6: View of the virtual-lab.
    
 
System description
 
The mechanical system under study is shown in Fig. 7.37. It is composed of a spring, a dumper and two contacting bodies with friction.
 
Fig. 7.37: Schematic description of the mechanical system.
 
The constitutive relationship of the friction is shown in Fig. 7.38. The model considers the static and the dynamic friction.
 
Fig. 7.38: Constitutive relationship of the friction.
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Introduction
 
The introduction of the virtual-lab is shown in Fig. 7.39.
 
Fig. 7.39: Introduction of the virtual-lab.
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Model
 
The equations describing the model, with the computational causality analyzed, are shown below. The model can be in one of the following three modes: Backward, Forward and Stuck.
 
 
The switching among the system modes is shown in Fig 7.40. The numbers in brackets indicate the panel where the switching condition is written: (1) Initialization; (2) Constraints; and (3) Evolution.
 
Fig. 7.40: Switching among the modes.
 
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View
 
The tree of elements is shown in Fig. 7.41. Open the virtual-lab and look at the properties of the tree elements.
 
Fig. 7.41: Tree of elements.
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