A Repair Strategy Based on Minimal and Imperfect Repairs for Two-dimensional Warranty

2010 ◽  
Author(s):  
Jian Yu ◽  
Xiangzhi Chen
Keyword(s):  
Two Dimensional ◽  
Repair Strategy ◽  
Imperfect Repairs

scholarly journals Imperfect Repair Strategies for Two-Dimensional Warranty

2021 ◽  
Author(s):  
◽  
Sima Rouhollahi Varnosafaderani
Keyword(s):  
Working Condition ◽  
Two Dimensional ◽  
Rectangular Region ◽  
Repair Strategy ◽  
Imperfect Repair ◽  
Free Replacement ◽  
The Times ◽  
The Cost ◽  
Imperfect Repairs ◽  
Repair Models

<p>When a repairable product under warranty fails, the manufacturer (warrantor) has the choice to either repair or replace the failed product. When repairing a failed product, the degree of repair which affects the working condition of the product can vary, and this is assumed to have an impact on the cost of the repair. The main motivation of this study is to develop a warranty repair strategy that minimizes the costs associated with servicing the warranty. In this research, the product coverage is represented by a two-dimensional rectangular region with a free-replacement warranty. We propose an imperfect repair strategy that suggests employing imperfect repairs of a predefined degree, in prespecified subregions of the warranty region. The aim is to then minimize the expected warranty servicing cost to the manufacturer by determining the optimal partitioning of the warranty region for the chosen degrees of repair. Two imperfect repair models are considered, and for both, the expressions for the distribution of the times to imperfect repair and the expected warranty servicing cost per product sold are derived. We numerically illustrate our findings and compare the expected costs of the proposed imperfect repair strategy with those of previously developed repair-replacement warranty strategies.</p>

scholarly journals Imperfect Repair Strategies for Two-Dimensional Warranty

2021 ◽  
Author(s):  
◽  
Sima Rouhollahi Varnosafaderani
Keyword(s):  
Working Condition ◽  
Two Dimensional ◽  
Rectangular Region ◽  
Repair Strategy ◽  
Imperfect Repair ◽  
Free Replacement ◽  
The Times ◽  
The Cost ◽  
Imperfect Repairs ◽  
Repair Models

<p>When a repairable product under warranty fails, the manufacturer (warrantor) has the choice to either repair or replace the failed product. When repairing a failed product, the degree of repair which affects the working condition of the product can vary, and this is assumed to have an impact on the cost of the repair. The main motivation of this study is to develop a warranty repair strategy that minimizes the costs associated with servicing the warranty. In this research, the product coverage is represented by a two-dimensional rectangular region with a free-replacement warranty. We propose an imperfect repair strategy that suggests employing imperfect repairs of a predefined degree, in prespecified subregions of the warranty region. The aim is to then minimize the expected warranty servicing cost to the manufacturer by determining the optimal partitioning of the warranty region for the chosen degrees of repair. Two imperfect repair models are considered, and for both, the expressions for the distribution of the times to imperfect repair and the expected warranty servicing cost per product sold are derived. We numerically illustrate our findings and compare the expected costs of the proposed imperfect repair strategy with those of previously developed repair-replacement warranty strategies.</p>

scholarly journals Imperfect Repair Strategies for Two-Dimensional Warranty

2021 ◽  
Author(s):  
◽  
Sima Rouhollahi Varnosafaderani
Keyword(s):  
Working Condition ◽  
Two Dimensional ◽  
Rectangular Region ◽  
Repair Strategy ◽  
Imperfect Repair ◽  
Free Replacement ◽  
The Times ◽  
The Cost ◽  
Imperfect Repairs ◽  
Repair Models

<p>When a repairable product under warranty fails, the manufacturer (warrantor) has the choice to either repair or replace the failed product. When repairing a failed product, the degree of repair which affects the working condition of the product can vary, and this is assumed to have an impact on the cost of the repair. The main motivation of this study is to develop a warranty repair strategy that minimizes the costs associated with servicing the warranty. In this research, the product coverage is represented by a two-dimensional rectangular region with a free-replacement warranty. We propose an imperfect repair strategy that suggests employing imperfect repairs of a predefined degree, in prespecified subregions of the warranty region. The aim is to then minimize the expected warranty servicing cost to the manufacturer by determining the optimal partitioning of the warranty region for the chosen degrees of repair. Two imperfect repair models are considered, and for both, the expressions for the distribution of the times to imperfect repair and the expected warranty servicing cost per product sold are derived. We numerically illustrate our findings and compare the expected costs of the proposed imperfect repair strategy with those of previously developed repair-replacement warranty strategies.</p>

MODELLING TWO-DIMENSIONAL LEASE CONTRACT WITH PREVENTIVE MAINTENANCE AND SERVICING STRATEGY

2016 ◽  
Vol 78 (6-6) ◽  
Author(s):  
H. Husniah ◽  
B. P. Iskandar
Keyword(s):  
Preventive Maintenance ◽  
Maintenance Cost ◽  
Two Dimensional ◽  
Penalty Cost ◽  
Repair Strategy ◽  
Imperfect Repair ◽  
Lease Contract ◽  
Time Required ◽  
Two Parameters ◽  
Usage Rates

In this paper, we study a two-dimensional lease contract with preventive maintenance and servicing strategy involving imperfect repair. The lease contract coverage is characterized by two parameters – age and usage. The lessor will carry out preventive maintenance (PM) and a servicing strategy which allows more than one imperfect repairs under the contract. In the lease contract studied, we consider that a penalty cost incurred when the time required to perform an imperfect repair exceeds a target. This servicing strategy aims to reduce equipment failures and hence decreasing the penalty cost and maintenance cost during the leased contract. We find the optimal PM degree and the imperfect repair strategy such that the expected total cost is minimized. Numerical examples are presented to illustrate the optimal PM and servicing strategy for various usage rates (heavy, moderate and low usage rates), and compared results for this servicing strategy with those of minimal repair strategy. 

Spectrophotometric measurements of objective-prism spectra

1966 ◽  
Vol 24 ◽  
pp. 118-119
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Progress Report ◽  
Two Dimensional ◽  
Objective Prism ◽  
Made In

I should like to give you a very condensed progress report on some spectrophotometric measurements of objective-prism spectra made in collaboration with H. Leicher at Bonn. The procedure used is almost completely automatic. The measurements are made with the help of a semi-automatic fully digitized registering microphotometer constructed by Hög-Hamburg. The reductions are carried out with the aid of a number of interconnected programmes written for the computer IBM 7090, beginning with the output of the photometer in the form of punched cards and ending with the printing-out of the final two-dimensional classifications.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

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