This paper presents a generic framework for modeling and assessment of preventive and corrective maintenances. The virtual age (VA) models of Kijima are generalized. The proposed definition provide many existing models as VA models. New models are also proposed. Covariates effects can be considered. The framework is generic in the sense that we propose an iterative way to compute the characteristics of the model that does not depend on the number of maintenances, on their types, on their effect models, and on the way of planning the preventive maintenances. Such a framework is particularly interesting in order to develop adaptive software tools, such as the virtual age models (VAM) package of R language. Methods are proposed for maintenance times simulation, maximum likelihood parametric estimations, and reliability indicators computation. Finally, we present two applications to real dataset issued from off-road engines of Brazilian mining trucks and bladder cancer study.

中文翻译：

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广义虚拟时代模型的通用框架

本文提出了一个用于建模和评估预防性和纠正性维护的通用框架。Kijima 的虚拟年龄 (VA) 模型被推广。提议的定义提供了许多现有模型作为 VA 模型。还提出了新模型。可以考虑协变量效应。该框架是通用的，因为我们提出了一种迭代方法来计算模型的特征，该方法不依赖于维护次数、类型、效果模型以及计划预防性维护的方式。这样的框架对于开发自适应软件工具特别有趣，例如 R 语言的虚拟年龄模型 (VAM) 包。提出了用于维护时间模拟、最大似然参数估计和可靠性指标计算的方法。最后，