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Pre-stress normal modes

Loading on a structure can affect the natural frequency of the system, similar to the way that tightening a guitar string increases its natural frequency.

Simulate the preloaded structure with a pre-stress normal modes analysis. 

A preload can have a significant effect on the system's natural frequencies and mode shapes for such structures as pressurized tanks rotating machinery. Induce an initial stress state on structures, such as rotor blades or taut strings.

Pre-stress normal modes to simulate structural loading