Dynamic Analysis

Dynamic analyses are used for simulations where inertial effects are not negligible or where the event is not static.  On this page we divide this into two categories.  Linear dynamics which uses an implicit solver method and explicit dynamics using the explicit solver method.


Linear Dynamics

Linear dynamics can be performed on a system to determine its response to a forced input load. Modal analysis is first conducted to determine the mode shapes and frequencies. Subsequent vibration environments such as random vibration, harmonic, or shock response can then be applied to determine deflections and stresses. In addition, pre-stress of an assembly such as rotating blades can be performed prior to a dynamic analysis to determine the effect on the response.  Vortex shedding frequencies can be determined as well as the development of Campbell diagrams for rotating components.



Explicit Dynamics

For analyses that are highly nonlinear, are of short duration, or may involve highly complex contact conditions, explicit dynamics can be used as a means for a more efficient simulation. Explicit analysis can also be used for quasi-static simulations depending on the nature of the problem. Examples often favored for this method include analyses such as ductile fracture, plastic deformation from manufacturing processes, projectile gun launch, or impact analysis of a component.  The portrayed animation is of a high speed impact of a round-nosed rigid projectile which involves contact, material plasticity, material damage and failure which is ideally suited for the explicit method.