DFMEA (Design FMEA) for a New Line Operation of the Underground Operation

S

sawataq

#1
Hello,:(

I was asked to write a DFMEA at the framework of a new line operation of the underground and i'm kind of comfused.

Could you pleeeeease help:bigwave:?

I don't know which my items/functions should be

Thank you very much in advance
 
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Marc

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Staff member
Admin
#4
This is very unique for here. And it's Friday so things are slowing down for the weekend. So - Responses may not come fast. I just wanted to clarify the scenario a bit. Let's see what happens from here.

When you say "Framework" - Can you tell us a bit more precisely what a Framework is?
 
S

sawataq

#5
Imagine that you are a member of the operation designing team and a new subway network is about to start operating. Sorry for my bad English. By the word framework i meant that this new network is about to start operating.
 
P

Pudge 72

#6
Well,
In my opinion, we need to understand the scope. Is this DFMEA responsible for Failure Modes across the entire system / project ; mechanical, computer, electrical, grid, layout etc. - or do you have a focused area that you are specifically responsible for? Are we looking at this from a technical perspective, or from the perspective of understanding risk within the process / system.
If we can understand what it is that you are tying to identify - then I think that we can go from there.

It's kind of like the difference between being on the Team that is designing the car door, or being on the Team that is designing the car. In the end, DFMEA will serve the same purpose for both groups and they will use the same tools, but their focus, starting point and scope is quite different regardless of whether or not they are at the DFMEA stage or PFMEA stage.
 

Marc

Fully vaccinated are you?
Staff member
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#7
That's what I was thinking, Pudge. sawataq still has to better define the scope of the Design FMEA (DFMEA). From what it sounds like the tunnels are dug, the trains are ready as are the terminals (stations). I'm wondering if this is for passenger traffic control and aspects such as that.

sawataq does specify that the focus in on "operations", but that still is a large scope. There is everything from the passenger aspects to train operators and station agents, etc. The further sawataq can define the scope of his project the better we can help.
 
S

sawataq

#8
I have to submit a project to my university and in my opinion it's all about understanding risk within the process / system, as Pudge 72 said.

As far as i can understand, the trains, the stations etc are ready. I was asked to write a flow chart, find the risks in each level of the flow chart and finally write the DFMEA.

Before that, I had to find passengers' requirements and determine quality criteria for each requirement.
Sorry, but i cannot be more specific because unfortunately i don't know any further information

Thank you
 
A

andtyl

#9
Sawataq-
If this is a University project, then it's a good practice/learning exercise.

I would start with a System FMEA. Normally you would do this before the trains, stations, etc. are all ready; you should do it when you are designing the system.

If you have already written a list of passenger requirements, you should have a list of functions (because requirements are all about how you are going to fullfill functions). An obvious function would be "to move people and things from place to place". Then you can go through the four generic failure modes for a function and determine what each one would mean in this case:
- No function
Trains don't move
People can't get onto trains
People can't get into stations
People can't get off of trains
People can't get out of stations
Ticket machines don't work
Ticket check turnstiles don't work

- Partial function or function degraded over time
Trains slow down
People have to wait too long for trains
Trains won't hold as many people as want to get on
Not all the people waiting can get on / off train
People have to wait too long to get into station
People have to wait too long to buy tickets
People have to wait too long to have tickets checked
People have to wait too long to get out of station

- Intermittent function
Trains intermittantly stop
Stations intermittantly close
Ticket machines intermittently stop working
Ticket turnstiles intermittently stop working

- Unintended function
People end up going to places other than where they wanted to go

There may be other ways that the function can fail.

You won't find this in any book, but I find it useful to also add "anti-functions", that is, things you don't want the system to do
- Not injure people, animals, or property
- Not cause excessive noise
- Not use excessive fuel
You could also treat these as system characteristics
- Safe for people, animals, property
- Noise less than XXX dB at XX m
- Fuel use less than XX per hour

From there you can figure out the Effects of each failure and the possible Causes of each failure. Keep in mind that what are causes for you are failure modes for the person doing the FMEA at the next level down in the design. For instance, you might decide that a cause for people ending up other than where they wanted to go is a switch in the wrong position. For the person designing the track system, the switch in the wrong position is the failure mode and he would have to figure out the causes why that might happen.

This should be enough to get you started! :)

This was kind of fun to think through....I worked as a temporary extra on our local transit system during a large sporting event earlier this year. We had to have prevention/detection items in place for all these things (except maybe excessive fuel use.)
 
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