Rheometry Method and System for Spectral Analysis of Squeeze Films

摘要

A method for analysing the dynamic response of sample fluids and semi-solids in a squeeze film using a rheometer with a first plate having a surface of substantially spherical form (convex) and a second plate having a surface of a substantially flat form is described. The method includes a data measurement step, a pre-processing step, and a spectral analysis step. In the data measurement step a squeeze film of a test material sample is supported between the plates, a force is applied and an input signal and output signal measured. In the pre-processing step dynamic equations for the geometric arrangement of the plates of the system are derived, and used to determine a non-linear spectral analysis algorithm describing the nonlinear relationship between the input and output. In the spectral analysis step non-linear spectral analysis of the measured data is performed using the non-linear spectral analysis algorithm to obtain material property result data. A rheometer system is also described.