Complex Products Critical Chain Management Based On Engineering Change Risk

Complex products are generally ordered according to customer needs.In order to ensure delivery on schedule,The design,production,and side-by-side modification of the product are common,which determines that the production process of complex products inevitably occurs engineering changes.Engineering changes disturb the internal production plan and will bring great uncertainty to the product delivery.This paper based on the critical chain progress management theory,combined with the DSM matrix and the constraint theory TOC studies the impact of engineering change from the angle of engineering change information interaction,resource constraints and buffer monitoring.The production process of complex products is not independent but closely related to each other.Combining engineering change risk matrix and critical chain progress management through the information interaction distance and intensity between the process of engineering change,with the goal of minimizing the total coordination time,the critical chain is determined according to the information flow interaction between the process of engineering change,and the work flow and information flow of the critical chain process is determined.According to the actual production capacity of the manufacturing resources at the time of the engineering change,the paper puts forward the index of the critical resource load ratio to verify the resource capacity by establishing the capacity demand plan for the process or parts that have changed,and finally analyzes the time effect of the engineering change on the production schedule through the change of the critical chain.The paper proposes a dynamic scrolling monitoring model based on engineering change risk for the traditional critical chain static monitoring which can not adapt to high risk and high variability.Different buffer times are allocated according to the exposure of change risk;A rolling accumulation of buffer monitoring volume in a single process.The normal deviation,general deviation and major deviation of buffering consumption are classified by engineering change,and the decision matrix of buffering action is established according to buffering consumption.In this paper,the theoretical scope of engineering change management is expanded,which is of practical significance to guide enterprises to analyze the impact of engineering change and complex product management.