From the course: SOLIDWORKS Simulation: Dynamic Analysis

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Pre-stiffened normal modes

Pre-stiffened normal modes - SOLIDWORKS Tutorial

From the course: SOLIDWORKS Simulation: Dynamic Analysis

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Pre-stiffened normal modes

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- [Instructor] In this video, we're going to review pre-stiffened normal modes analysis. Now, many real-world components are subject to some kind of pre-load, or they might develop steady state loads during their operation. For example, we've got pre-tensioned bolts. Imagine a transmission tower which is braced to ground by heavily pre-stressed guide wires. And a helicopter rotor blade when spinning has a tremendous level of centrifugal force which really stiffens that blade up. That's the example we're gonna be using in our demonstration video which is coming up shortly. Now, the pre-stiffening effect, and if we look at the helicopter blade here as an example, it's spinning about the spin axis, it develops a very high load within the structure. The linear stiffness matrix that we calculate is unaffected by this, so we'd call that linear stiffness matrix. But then we have a load dependent stiffness matrix, and that's actually changing. So that's the stiffness matrix dependent on the…

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