Abstract
Although it is recognized that load cells should be installed at a stiff and flat place in case of measuring compressive load, the criterion of stiffness has not been prescribed explicitly. In this study, knocking tests were carried out using a cylindrical sensor type model cell installed at a statically stiff place correspond to non reflective condition and a dynamically stiff place to total reflective condition, and the results revealed that the output values of load cell are significantly influenced by the stiffness of setup location. Subsequently, effect of boundary conditions on the output values of load cell was investigated through a simulation technique based on the impedance method. It was shown the output values of load cell are greatly affected by the size of collision object in addition to the influence of setup location, and the ratio of output values for each reflection condition is proportional to about 0.48 power of the size of collision object.
