Class6技术-1风险识别的工具和方法解析.ppt

Section 3: FEMA method FEMA-related issues Potential failure modes: means form or problems that may occur do not satisfy the requirements of the process for some projects. It may be caused by potential failure modes under a process, and it may be the consequence of a previous process failure modes. The consequences of failure: refers to the adverse effects of the failure mode to product quality or customer. Cause of failure / mechanism: refers to the failure about how it happened, and should be described on basis of the principle that control can be corrected. Procedure of FEMA FEMA- Severity” S” Severity S- for consequences / issues Severity corresponds to the consequences. Generally only design changes can change the severity of the consequences. Severity established links between failure modes and level of risk, and focus on high severity, play a guiding role in resources. Divided into 1-10 severity level of a failure mode, choose the consequences maximum calculated RPN. FEMA- Frequency “O “ Frequency O Frequency refers to the frequency of failure cause / mechanism is expected to occur, points 1-10. Preventive measures can reduce the frequency of occurrence. FEMA- Detection “ D “ Detection D Assessment the possibility of failure discovery for the existing control methods. In doing Detection Evaluation, the assumption that failure mode has occurred must be done. Control measures may be considered as follows: inspection and testing procedures, control of nonconforming product program, mistake proofing techniques, statistical process control, process control plans. Divided into 1-10. FEMA- Risk Priority Risk priority number (RPN) is a product of formula related to serious degree (S), the number of frequencies (O) and the number of detecting (D) RPN = S · O · D ??????Risk priority number is a measure of risk. ??RPN value between 1-1000, if you are at high risk priority number, the designer must take corrective measur