What is the definition of FMEA? Three elements of failure mode analysis

Date：2022-01-14 15:57:10Views：2716

Definition of FMEA: FMEA is a quantitative analysis using a bottom-up approach. It can be implemented in the design or process. It identifies weaknesses in the design or process. It starts from the low level (component level) of the product or process to the failure of the system or subsystem. It highlights the key characteristics of the system or subsystem. The main purpose of FMEA is to identify the potential problems that may affect the safety and performance of the system or product in the early design process, and introduce countermeasures to reduce or minimize the impact of the identified potential problems (failure modes).

The basic concept and three elements of FMEA failure analysis:

Quantitative risk assessment, listing causes / mechanisms, and looking for preventive / improvement measures.

Quantitative risk assessment refers to the quantitative assessment of the impact and loss possibility of the risk event on people's life, life, property and other aspects before or after the risk event (but not yet over). That is, risk assessment is to quantitatively evaluate the possible degree of impact or loss caused by an event or thing.

Since product failures may be related to design, manufacturing process, system, service, application and machine, FMEA is divided into 7 types:

DFMEA (FMEA design failure mode and consequence analysis)

PFMEA (Process FMEA process failure mode and consequence analysis)

SFMEA (system FMEA (subsystem failure mode and consequence analysis)

SFMEA (service FMEA service failure mode and consequence analysis)

MFMEA (machine FMEA)

Afmea (application FMEA)

PFMEA (purchasing FMEA procurement failure mode and consequence analysis)

Among them, Design FMEA and Process FMEA are most commonly used, including severity (s), frequency (o) and difficult to detect measure (d); Because these three parameters determine the final RPN value.

Purpose of FMEA

It can modify the product or process easily and at low cost, so as to reduce the modification of post crisis.

Find measures that can avoid or reduce the occurrence of these potential failures;

The weakness of reliability in design is pointed out, and the countermeasures are put forward

According to the required specifications and environmental conditions, the inappropriate design can be improved in real time by using experimental design or simulation analysis to save unnecessary losses

The effective implementation of FMEA can shorten the development time and cost

At the initial stage of FMEA development, design technology was considered, but later development, in addition to the use of design time, manufacturing engineering and inspection engineering can also be applied

Improve product quality, reliability and safety

Advantages of FMEA

In the early design stage, assist in selecting design alternatives to improve product reliability and safety.

All possible failure modes and their effects have been considered to make the production work smoothly.

Be able to clearly understand and confirm the cause of potential failure and its corresponding effect.

Provide a basis for test planning in development and final design verification.

Provide historical documents for reference when assisting in market failure analysis and design change consideration.

During the design review stage, the engineer can report to the management to confirm the organization's efforts to prevent defects.

The above is the FMEA failure mode analysis related content compiled by the creative core detection team. I hope it will be helpful to you. Chuangxin testing is a professional testing organization for electronic components. At present, it mainly provides integrated circuit testing services such as capacitance, resistance, connector, MCU, CPLD, FPGA and DSP. Specializing in functional testing of electronic components, incoming appearance testing of electronic components, anatomical testing of electronic components, acetone testing, X-ray scanning testing of electronic components and RoHS component analysis testing. Welcome to call, we will serve you wholeheartedly!