amin eskandarzadeh sabet

The existence of a proper system for machine maintenance is an effective factor in the proper operation of the machine and reduction in maintenance costs. Condition-based maintenance, which is actually the most efficient method of maintenance, is done with different methods, the most important of which is the oil analysis method. In the oil analysis method, the properties and different materials resulting from the erosion and degradation of the oil of different parts of machines such as engine, gearbox, hydraulics, etc. are examined. The analysis of the results of different oil tests is based on the allowed amounts of erosion particles and other characteristics and components in the oil. The basis of the oil analysis is to represent the exact state of the active machine in a certain period of time. In this paper, with the approach of theoretical and field studies and using the information of more than 3000 construction machines, some ranges of functional indicators of the results of oil analysis are presented to reduce breakdowns and increase the efficiency of machines.</em>

Magnetic shape memory alloys are a subset of excitatory materials whose material shape and other mechanical properties change in response to magnetic and mechanical fields. Memorable alloys in recent years due to their unique properties such as high corrosion resistance, relatively high electrical resistivity, relatively good mechanical properties, long fatigue, high ductility and adaptability to the body in a wide range of Industries have been considered. These alloys are smart materials that can recall their original shape after deformation. The purpose of this paper is to introduce, apply and study the properties of magnetic memory materials. In fact, by presenting several studied models, structural equations, properties, their application in different fields and diagrams, we have tried to study these materials and we have discussed the existing challenges, such as the existence of asymmetric rate-dependent hysteresis with large saturations and its solution.

oil analysis Examines the sample method and shows the characteristics and different materials resulting from erosion, pollution, etc. in engine oil, gearbox and hydraulic system. In fact, this method of sampling is analysis based on the unauthorized contents of the oil. The basis of oil analysis work is to reflect the condition of the machine for a certain period of time by showing the condition of the machines in operation. Oil analysis is a tool that can be used to help check the condition of a machine oil. It is like sampling human blood and the oil sample does not represent everything that happens inside the machine, but it can provide valuable information. Today, equipment is used at the level of some workshops that reduces the user's visit to the standard laboratory, but since these devices have not been studied so far, we decided to include them in this paper. From the point of view of erosive elements, contamination ,physical and chemical characteristics are examined only  from the point of view of existing devices and its accuracy and quality are compared with the standard method.