Integrating Economic Considerations to Develop a Component Replacement Policy Based on a Cumulative Wear-Based Indicator for a Vehicular Component
First Claim
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; and
an 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.
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Abstract
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.
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Citations
20 Claims
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1. A method comprising the following steps:
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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; and an 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computer program product, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a computing device to cause the computing device to:
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determine, 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, a corresponding given threshold value on the transformed time scale; calculate, 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; and an average runtime of the vehicular component prior to a scheduled replacement for each instance wherein the vehicular component reached the corresponding given threshold value; calculate, 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; compare 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 generate 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.
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13. A system comprising:
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a memory; and at least one processor coupled to the memory and configured for; determining, 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, 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; and an 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.
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14. A method comprising the following steps:
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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, for each of the multiple lifetime wear indicator functions at each of the multiple corresponding candidate threshold values; 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 candidate threshold value; and an average runtime of the vehicular component prior to a scheduled replacement for each instance wherein the vehicular component reached the corresponding candidate threshold value; calculating, for each of the multiple lifetime wear indicator functions, an economic criterion value for each of the multiple corresponding candidate threshold values 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, for each of the multiple lifetime wear indicator functions for the vehicular component, the economic criterion value for each of the multiple candidate threshold values to identify one of the multiple candidate threshold values that optimizes the economic criterion value for the corresponding lifetime wear indicator function; comparing the multiple lifetime wear indicator functions for the vehicular component at the candidate threshold value that optimizes the economic criterion value for the corresponding lifetime wear indicator function 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 threshold value that optimizes the economic criterion value for the corresponding lifetime wear indicator function; wherein at least one of the steps is carried out by a computing device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification