Abstract: Spares demand rate is an important factor affecting the number of spares required and is a vital parameter in spares inventory calculation models. However, little work was focused on the spares demand analysis using systematic procedures. This paper addresses the issue of analyzing spares demand generation, transfer and analytical algorithm in multi-echelon maintenance support organizations with the purpose of developing an effective spare demand rate calculation method. First, the factors affecting spares demand are analyzed and the relationship between maintenance requirement and spares demand is discussed. Then the spares demand transfer process of corrective maintenance and preventive maintenance between each two of the multi-echelon maintenance support organizations is expatiated. The method of how to incorporate two aforementioned types of demand in spares inventory calculation models is also given. In the end, based on the research conclusion, the spares stock project is given in a numerical study which is tested by computer simulation. Simulation result shows that the algorithm works well and so, the feasibility and rationality of the analytical method are validated.

Key words: spare, demand analysis, transfer, influencing factors analysis, analytic algorithm