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Need help in solving SDOF cantilever
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[QUOTE="jrmichler, post: 6634656, member: 638574"] Have you learned that continuous beams have an infinite number of natural frequencies? And that a SDOF model applies to only one of those natural frequencies, normally the lowest frequency? The confusion seems to be that a SDOF model has three parameters, and you have 60,000 data points. These type of problems are solved by curve fitting. Well, here are some clues: 1) The data plot shows the natural frequency, and the damping rate. 2) Natural frequency of a SDOF system is the ratio of stiffness to mass. 3) You can measure the stiffness directly by pulling on the beam with a known force and measuring the deflection with a ruler. 4) That allows you to calculate the mass of a SDOF with the same natural frequency of the beam. That mass will not be equal to the mass of the beam. Do you know why? 5) Now that you have stiffness and mass, find the damping that matches the rate of damping in the data. Plot the response of the resulting equation on the same axes as your experimental data. They should match. [/QUOTE]
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Need help in solving SDOF cantilever
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