DFMEA Explained _ Automobile Engineering _ BAJA - SUPRA - FSAE
- 4 years ago
This is the 8th Lesson of Automotive Engineering for Competitions under the Safety Module.
The Acronym might sound scary but this is a bit simpler than it sounds. DFMEA stands for Design Failure Mode Effective Analysis.
How many of you have seen a car/bike/truck getting crashed but the driver passenger still manage to escape and save his/her life.
Ok, now you have also heard that the most causalities happens due to road accident. Over 2,57,000 people were killed in road accidents in 2016 alone, that is more than the number of people killed in all our wars put together. There is one death every four minutes due to a road accident in India.
Automobile Companies use this DFME Analysis once their design/product is ready, to minimize the risk of failure and prepare for alternatives so that it is convenient for the people to sort out any trouble as quickly as possible.
I will not go very deep into the theoretical aspects of DFMEA, for that you have internet and your college teacher. Without wasting much of your time.I will let you know how to calculate RPN No. and how to minimise RPN.
So, RPN stands for Risk Priority No. which is calculated by the multiplication of Sevirity, occurance and detection.
Severity stands for the overall impact your car will suffer if a component gets fail, we will discuss it in detail in the next slide.
Occurance is the probablity of a certain part to get fail that is how frequent that component is getting failed.
Detection is how easily you can identify failure in a component of your car.
This is the slide that you need to put down in your PPT,
In the first column you need to put down the names of subassemblies where chances of failures are most likely.
In the second column the potential modes of failure for that particular subassembly is mentioned for example a engine will fail if there is a leakage.
Then in the third column the effect of failure will be mentioned, in case of engine leakage there will be fire or the engine performance will go down due to oil leakage.
Now fourth column is severity, which as we discussed in the last slide is the impact it has on your car if engine fails. Now because engine plays a vital role in a car and wit engine failure, you won't be able to drive it. So we have put a severity of 10 which is maximum and 1 is less severe.
5th column explains the mechanism which is responsible for the failure, in case of engine it is defective manufacturing and improper handling.
The sixth column stands for occurance i.e. how frequent is the chances of this part getting failed is there. Measured on a scale of 1 to 5
The seventh column stands for current design which you have made and analysed using CAD and CAE to control such failure.
The 8th column is the type of identification, you can make it can be either detection or prevention depending on the type of subassembly.
The 9th column stands for the scale of ease under which you can identify the point of failure.
In the tenth column you have
The Acronym might sound scary but this is a bit simpler than it sounds. DFMEA stands for Design Failure Mode Effective Analysis.
How many of you have seen a car/bike/truck getting crashed but the driver passenger still manage to escape and save his/her life.
Ok, now you have also heard that the most causalities happens due to road accident. Over 2,57,000 people were killed in road accidents in 2016 alone, that is more than the number of people killed in all our wars put together. There is one death every four minutes due to a road accident in India.
Automobile Companies use this DFME Analysis once their design/product is ready, to minimize the risk of failure and prepare for alternatives so that it is convenient for the people to sort out any trouble as quickly as possible.
I will not go very deep into the theoretical aspects of DFMEA, for that you have internet and your college teacher. Without wasting much of your time.I will let you know how to calculate RPN No. and how to minimise RPN.
So, RPN stands for Risk Priority No. which is calculated by the multiplication of Sevirity, occurance and detection.
Severity stands for the overall impact your car will suffer if a component gets fail, we will discuss it in detail in the next slide.
Occurance is the probablity of a certain part to get fail that is how frequent that component is getting failed.
Detection is how easily you can identify failure in a component of your car.
This is the slide that you need to put down in your PPT,
In the first column you need to put down the names of subassemblies where chances of failures are most likely.
In the second column the potential modes of failure for that particular subassembly is mentioned for example a engine will fail if there is a leakage.
Then in the third column the effect of failure will be mentioned, in case of engine leakage there will be fire or the engine performance will go down due to oil leakage.
Now fourth column is severity, which as we discussed in the last slide is the impact it has on your car if engine fails. Now because engine plays a vital role in a car and wit engine failure, you won't be able to drive it. So we have put a severity of 10 which is maximum and 1 is less severe.
5th column explains the mechanism which is responsible for the failure, in case of engine it is defective manufacturing and improper handling.
The sixth column stands for occurance i.e. how frequent is the chances of this part getting failed is there. Measured on a scale of 1 to 5
The seventh column stands for current design which you have made and analysed using CAD and CAE to control such failure.
The 8th column is the type of identification, you can make it can be either detection or prevention depending on the type of subassembly.
The 9th column stands for the scale of ease under which you can identify the point of failure.
In the tenth column you have