Let b be the damping constant of the mounting structure of a machine as pictured in Figure P15.7. It must be determined experimentally. First, the spring constant K is determined by measuring the resultant displacement under a static load. The mass m is directly measured. Finally, the damping ratio ? is measured using an impact test. The damping constant is given by If the allowable levels of error in the measurements of K, m, and ? are±5 percent, ±2 percent, and ±10 percent, respectively, estimate a percentage error limit for b.
Analysis:
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