نشریه پژوهش در مهندسی نگهداشت دفاعی
پیاپی 1 (بهار و تابستان 1398)

Equipment in their lifecycle degerades due to failures, environmental condition and instances and consequently they beome unready for operations. On the other hand the readiness of the equipment has a key role in managers and leaders decisions about the way to use equipment. Currently, for planning a mining project, just the readiness of the equipment is considered based on check lists and their future status is not taken in to account. While having a prediction of the equipment status during project time enable decision makers to plan more precisely and prevent shutdown in production or service procedure. In this research, initially failure behaviure of the equipment is modeled using weibull distribution and reliability of the equipment will be calculated during its life cycle. Afterwards, preventive maintenance planning will be indicated considering two objective namely cost and shutdown minimization under acceptable reliability level of the equipment as service level. The case study resuts show that the historical data affect maintence plan significantly.

Today with considering the asymmetry of wars and the necessity of speeding operations in the presence and displacement of soldiers, as well as the deployment of military forces in various operating conditions, the availability of modern equipment and the knowledge of their employment are essential. Personal ascender is One of these new warfare equipment. In this work, it has been attempted to design, simulate, and analyze a low-weight system as well as the use of battery as a power source to provide the energy needed to move, step forward to improve and improve relief and auxiliary equipment. In this work, by designing and simulating a gearbox with its crust and other accessories for building an ascender, it has been tried to obtain the information and basic knowledge necessary to build a prototype of a personal ascender.

By progress of technology and increment of investment in equipment, the importance and complexity of maintenance management has increased so that organizations tend to pay for the establishment of a comprehensive maintenance management system instead of paying for the costs of stopping and repairing the machine Therefore, in this article, we will determine the optimal policy for establishment of maintenance management system. By identifying various types of accidental, corrective, adaptive and preventive maintenance and defining two scenarios of outsourcing and implementation by the organization Review the strengths and weaknesses of each of them in 1 5 criteria have been developed. Then, by using a fuzzy logic, based on the results of the completed questionnaires and the application of the fuzzy AHP model, the simultaneous implementation of preventive, corrective and accidental maintenance systems by the personnel Inside the organization has been identified as the optimal model.

The role of asset management (AM( as a strategic enabler contributing to the current competitive business landscape is rapidly evolving. The emergence of the AM professional has transitioned the maintenance engineer from a role whose primary responsibility is repair to that of a strategic value enhancer. This means AM professionals are now tasked with delivering strategic asset value contributions in alignment with their organization’s overall business objectives. the discipline of AM has evolved rapidly in the last few years. Unfortunately, some areas of the AM BOK have not kept up with this frenetic pace of change. A notable example is criticality and its continued use and misuse throughout literature. The confusion surrounding criticality is largely due to its synonymous use with risk, as well as the fact that both terms have an identical mathematical expression. This paper discusses the criticality for asset management professionals and points to the need to adopt a risk-based approach. Risk management is also reviewed in international standards and finally a risk-based approach is presented as a solution.

Maintenance plays a key role in reducing costs, reducing machinery stoppage and increasing production capacity, improving quality and increasing productivity and reliability of machinery and thus achieving organizational goals. The main purpose of this research is to provide a framework for measuring and comparing the greenness of military industries. In order to achieve the goals and answer the research questions, this research was conducted in two steps. In the first step, by studying the scientific literature and acquaintance of experts familiar with environmental issues, green maintenance of military equipment and equipments, optimal indicators of green maintenance and maintenance strategies were identified based on the extracted main dimensions and based on preparation of the first questionnaire. After collecting expert opinions, 6 main criteria for localization were selected. In the second step fuzzy hierarchical analysis process method was used to prioritize these criteria. The results show that in the military industries, the criteria for using technology, equipment and machinery are less polluting for the environment, the criterion for controlling the production of hazardous gases such as ammonia and CO2, and the criteria for environmental training programs for employees. And the managers came in third.