Selection and research of two-factor model for conversion function of vortex sonic flowmeters

The paper presents a method of searching the two-factor mathematical model conversion functions of vortex sonic flowmeters based on the results of special tests. In the proposed model resulting flow depends on the frequency of vortex shedding behind bluff body and the temperature of the liquid. Model selection was done using the method of all possible regression, coefficients was calculation made based on the weighted least squares method. We propose a method for adapting a two-factor conversion functions for use in flowmeter series production. The results of the proposed functions usage are shown on the example data from the production of vortex sonic flowmeters.