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That equation gives relation to shift factor. What I am looking for is time and temperature OR frequency and temperature. Before I even start doing experiment I should have an idea upto what temperature I have to test to be able to shift data to desired frequency. For e.g. I want data up to...

Hi, I am trying to evaluate viscoelastic properties of a polymer through dynamic mechanical analysis. I am using time temperature superposition principle to evaluate properties at extended frequency. I am wondering if there is any formula that relates temperature with time (or frequency) which...

Thanks Rob and Greg... very useful. The effect of a tuned mass damper is optimal when the added mass-spring system has no or minimal damping - I agree to this. The damping material has to be selected with optimum loss factor considering the increase in amplitude on higher side and presence of...

Thanks Greg. I am yet to do testing. I will upload once I get them. I am not considering automotive structure. It is an aerospace structure with very little damping. But yes I am referring to the same question what you hinted - damping in FRF at and away from TMD will be different. So I am...

Thank you for the response. Tuned Mass Dampers have a damping layer along with tuned mass. If it has only tuned mass it is usually termed as dynamic absorber. The targeted mode will look like two split modes without damper. If you add damper it gets smoothed out. Passive dampers are usually...

Hi, I am trying to do experimental modal analysis on a structure with tuned mass dampers (TMD) mounted discreetly on it. When compared to testing an undamped (without TMDs) structure, what are the issues / precautions that need to be considered while testing, curve fitting? Suggestions on how...