Method and algorithm for predicting leak rates
First Claim
1. A method for calculating system fluid loss from a tire system based on measured fluid loss of a substitute fluid from the tire system, the tire system comprising a tire having structural parameters including a tire inner volume and a tire outer volume, the method comprising the steps of:
- (a) obtaining data identifying a fluid loss rate of the substitute fluid from the tire system;
(b) using the data to calculate a rate factor f for the substitute fluid which defines the factor by which the leak rate of the substitute fluid is different from the leak rate of the system fluid;
(c) using the rate factor f with the gas law equation PV=nRT and the tire structural parameters to calculate the expected tire system fluid loss in the tire system.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and algorithm for predicting the fluid loss rate of a system, uses data for the leak rate from the system for a substitute fluid that leaks at a different rate than the system fluid. In the illustrated embodiment, the system is a pneumatic tire and the substitute fluid is helium gas. The helium leak rate data is used in a Fortran program to predict the air loss rate from the tire by determining the leak rate factor f’ for helium, as compared to air, and using ‘f’ to calculate the air loss rate.
-
Citations
11 Claims
-
1. A method for calculating system fluid loss from a tire system based on measured fluid loss of a substitute fluid from the tire system, the tire system comprising a tire having structural parameters including a tire inner volume and a tire outer volume, the method comprising the steps of:
-
(a) obtaining data identifying a fluid loss rate of the substitute fluid from the tire system;
(b) using the data to calculate a rate factor f for the substitute fluid which defines the factor by which the leak rate of the substitute fluid is different from the leak rate of the system fluid;
(c) using the rate factor f with the gas law equation PV=nRT and the tire structural parameters to calculate the expected tire system fluid loss in the tire system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A method for calculating system fluid loss from a tire system based on measured fluid loss of a substitute fluid from the tire system, the tire system comprising a tire having measurable structural parameters including a tire inner volume, a tire outer volume, and pressure, the method comprising the steps of:
-
(a) positioning the tire system containing the substitute fluid within a test chamber;
(b) obtaining data identifying a substitute fluid loss rate from the tire system into the chamber;
(c) using the data to calculate a rate factor f for the substitute fluid which defines the factor by which the leak rate of the substitute fluid is different from the leak rate of the system fluid;
(d) using the calculated rate factor f with the gas law equation PV=nRT to calculate the expected tire system fluid loss in the tire system. - View Dependent Claims (10, 11)
varying at least one of the liner parameters and obtaining data identifying a substitute fluid loss rate as a function of the varied liner parameter;
using the data to calculate a rate factor f for the substitute fluid as a function of the varied liner parameter; and
using the calculated rate factor f to calculate the expected system fluid loss in the tire system as a function of the varied liner parameter.
-
-
11. The method of claim 9 which further includes:
-
varying at least one of the tire structural parameters and obtaining data identifying a substitute fluid loss rate as a function of the varied liner parameter;
using the data to calculate a rate factor f for the substitute fluid as a function of the varied tire structural parameter; and
using the calculated rate factor f to calculate the expected system fluid loss in the tire system as a function of the varied tire structural parameter.
-
Specification