To calculate the effects of rotating unbalance, we need to

Chapter , Problem 13.14

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To calculate the effects of rotating unbalance, we need to know the value of the product \(m_{u} \epsilon\), where \(m_u\) is the unbalanced mass and \(\epsilon\) is the eccentricity. These two quantities are sometimes difficult to calculate separately, but sometimes an experiment can be performed to estimate the product \(m_{u} \epsilon\). An experiment was performed on a particular rotating machine whose mass is 75 kg. The machine’s support has negligible damping and a stiffness of k = 2500 N/m. When the machine operates at 200 rpm, the measured force transmitted to the foundation was 15 N. Estimate the value of \(m_{u} \epsilon\).

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