Elucidation of the Point of Issues on Dynamic Load Cell and Utilization of the Result

—Output Value of Load Cell Is Proportioned to the Size—

Abstract

Loading experiments were carried out by striking a weight against two column-type load cells of different size which were set up on the bases having different dynamic rigidities. The results showed a maximum output value appears when a large size load cell is set up on the large dynamic rigidity base, and a minimum value in a small size cell on the small rigidity base. The results stated above can be explained through a simulation based on the method of impedance which takes into account the multiple reflections of stress waves generated by the collision among the weight, the load cell and the setup base. Furthermore, increase of the load cell size results in a convergence of the output value, and the converged value is considered to be the dynamic load. Therefore, the dynamic load can be determined through experiments using different size of load cells of which output values are coincided. If output values are not coincided, the dynamic load can be estimated by regression using the data from an additional experiment with larger size load cell.