EG260 Measurement - A.K. Slone EG-260 Dynamics (1)...

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Unformatted text preview: A.K. Slone EG-260 Dynamics (1) a.k.slone 2009 1 of 7 EG-260 DYNAMICS I Measurement Introduction ......................................................................2 1. Measurement ............................................................2 1.1. The logarithmic decrement method. ......................3 1.1.1. Measurement over more than one cycle. ........5 Example 1 .........................................................................5 1.2. The added mass method. .........................................6 Example 2 .........................................................................6 A.K. Slone EG-260 Dynamics (1) a.k.slone 2009 2 of 7 Introduction Mass and stiffness are measured statically but damping must be measured from a dynamic test. Hence, damping measurements are often the least reliable coefficient in the equations of motion. 1. Measurement For an undamped system the displacement amplitude decays exponentially, see Figure 1, i.e. the natural logarithm of the amplitude ratio for any two displacements separated in time by a constant increment is a constant....
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This note was uploaded on 05/18/2010 for the course ENGINEERIN EG 260 taught by Professor Stone during the Spring '10 term at Swansea UK.

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EG260 Measurement - A.K. Slone EG-260 Dynamics (1)...

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