ANSI/ASA S2.31-1979 (R2009)

Vendor Note: This standard is the first part of a series of five standards covering the experimental determination of mechanical mobility ofstructures by a variety of methods appropriate for different test situations. The present Part I of this series covers basicconcepts and definitions and serves as a guide for the selection, calibration, and evaluation of the transducers and instrumentsused in mobility measurements. The material in Part I is common to most mobility measurement tasks. This documentsupersedes ANSI Standard S2.6-1963(R1976). The future parts of this series will cover specific mobility measurementsituations such as the use of steady-state rectilinear excitation, steady-state torsional excitation, measurements of the entiremobility matrix using steady-state excitation, and mobility measurements using impact excitation, as well as other forcingfunctions which use Fourier transform techniques for data reduction. The present document (Part I of this series) has fourappendices containing selected references to the literature, a discussion of the relationships between mechanical mobility andimpedance, a discussion of mobility as a frequency response function, and conversion factors from S1 to conventional Englishunits as applicable to mobility and related ratios.