Superelement

 

Superelement:

 




1. What is superelement and why it is used in FEA?
: A superelement is a reduced representation of a structure.





2. Why it is used:
 : To reduce the solution time of solver without affecting accuracy

3. Types of superelement?

a.Static condensation superelement - This method reduces the elastic FE model and load vectors (e.g., points and pressure) to the interface degrees of freedom
b. Dynamic reduction superelement - This method reduces the elastic FE model to the interface
degrees of freedom and a set of normal modes, which are generated from static modes and normal modes analyses.
c. Component dynamic superelement - This method is efficient for models under iterative loading


Comments

Post a Comment

Popular posts from this blog

2 stroke engine and 4 stroke engine vibration characteristics

Image
  2 stroke engine and 4 stroke engine vibration characteristics Two-stroke engines typically have a higher vibration frequency than four-stroke engines due to their simpler design and the fact that the power stroke occurs twice as often in a two-stroke engine for every revolution of the crankshaft. This can lead to a rougher or more "buzzy" feeling when operating a two-stroke engine. On the other hand, four-stroke engines have a lower vibration frequency because the power stroke only occurs once every two revolutions of the crankshaft, which can result in a smoother operation. Additionally, four-stroke engines are typically more complex in design with additional components such as valves and camshafts which can help dampen engine vibrations. In addition to the vibration frequency, the magnitude of the vibration is also different between two-stroke and four-stroke engines. Two-stroke engines often have a higher amplitude of vibration because they have fewer components to absor...
Read more

Loads needs to be considered during ship structure analysis

Image
  ยท           Loads needs to be considered during ship structure analysis: 1. Hull Girder Loads   consist of wave-induced and still water loads on the hull girder. This load should be considered for longitudinal structure in the main hull, and for the interaction of a long continuous deckhouse (superstructure). 2. Hydrostatic Loads are pressure loads due to fluids. The pressure could be either internal or external. Examples of hydrostatic loads are external pressure of the bottom and sides of shell plating, and internal pressure in tanks and on watertight bulkheads. 3. Hydrodynamic Loads consist of liquid sloshing in tanks, shipping of green water on the weather deck and impacting on the house front, and wave slap on all exposed structure and equipment above the waterline, etc. 4. Live Loads consist of uniform deck loading, concentrated loads such as forklift or aircraft landing and parking loads, support reactions from stanchio...
Read more

Ship Structural Failure Modes

Image
  Ship Structural Failure Modes Cracks can occur due to fatigue and brittle fracture. Buckling is due to in plane compressive stresses during hogging and sagging of the ships. An Indent occurs during cargo handling. Any dent in the plate due to lateral hitting of the ship by external vessels like tugs is in Indent. Corrosion is one of the main failure modes that presents always in the maritime field. 1.        CRACKS: Most of the cracks that occur in ship are due to fatigue. Fatigue is the failure of a material by cyclic loading. A large number of complicated welded plate joints can be found in an ocean- going ship. During the service time of the vessel these plates are exposed to time-varying loads caused by the irregular seaway, the propulsion system, and changes in the loading conditions. Hard spots, such as connections between longitudinal stiffeners and web frames, where local rises in stress intensity can be found, may therefore be prone to f...
Read more