Integrating economic considerations to develop a component replacement policy based on a cumulative wear-based indicator for a vehicular component

摘要

Methods, systems, and computer program products for generating a vehicular component replacement policy are provided herein. A method includes, for each of multiple lifetime wear indicator functions associated with a vehicular component, wherein each lifetime wear indicator function comprises a transformed time scale plotting wear indicator values over a period of time, determining multiple corresponding candidate threshold values on the transformed time scale; calculating: a survival probability function for the vehicular component based on each transformed time scale, an average runtime of the vehicular component prior to failure, and an average runtime of the vehicular component prior to a scheduled replacement; calculating an economic criterion value for each given threshold value based on the above calculations and one or more economic parameters; generating the replacement policy to include (i) the lifetime wear indicator function that optimizes the economic criterion value and (ii) the corresponding threshold value.

主权项

1. A method comprising the following steps:
for each of multiple lifetime wear indicator functions associated with a vehicular component, wherein each lifetime wear indicator function comprises a transformed time scale plotting wear indicator values over a period of time, determining a corresponding given threshold value on the transformed time scale; calculating, for each of the multiple lifetime wear indicator functions:
a survival probability function for the vehicular component based on the transformed time scale of each of the multiple lifetime wear indicator functions;an average runtime of the vehicular component prior to failure for each instance wherein the vehicular component failed prior to the corresponding given threshold value; andan average runtime of the vehicular component prior to a scheduled replacement for each instance wherein the vehicular component reached the corresponding given threshold value; calculating, for each of the multiple lifetime wear indicator functions, an economic criterion value for the corresponding given threshold value based on (i) the survival probability function, (ii) the average runtime of the vehicular component prior to failure, (iii) the average runtime of the vehicular component prior to a scheduled replacement, and (iv) one or more economic parameters; comparing the multiple lifetime wear indicator functions for the vehicular component at the corresponding given threshold value to identify one of the multiple lifetime wear indicator functions that optimizes the economic criterion value; and generating a replacement policy for the vehicular component, wherein said replacement policy comprises (i) the identified lifetime wear indicator function and (ii) the given threshold value corresponding to the identified lifetime wear indicator function; wherein at least one of the steps is carried out by a computing device.