RESUMO
Objective To determine the relationship between the theory and actual displacement of the urine flow rate meter calibration device gear pump, and to construct a model between actual and theory displacement, in order to obtain actual displacement via theory displacement. Methods The weight of the standard water flow in each flow rate was measured by B2000S digital scales,and the scatter plot between the theory displacement and actual displacement was drawn to find the best fitted curve;then the MATLAB Curve Fitting Tool was used to obtain the best quasi relational equation. Results The error between the fitted displacement and the actual displacement of the gear bump was 1.494% in maximum and-0.010% in minimum, far less than 5% of the requirements for urinary flow meter measurement. Conclusion Based on regression analysis, the relationship between the theoretical displacement and actual displacement of the flow rate meter calibration device is established,the fitting error is small,and the method is simple and easy to achieve.