Fogen Project
Would you like to react to this message? Create an account in a few clicks or log in to continue.
Log in

I forgot my password


Failure intensity

2 posters

Go down

Failure intensity Empty Failure intensity

Post by Erik_Werner Sat Oct 18, 2008 8:31 pm

Does someone know if Kristian showed an example about failure intensity during one of his lectures? I want to answer this question from 15 January exam 2008:

5c) Below you find a record from failure occurrences when testing a system. We can
assume that once a failure is found, it is corrected.
Failure
number
Failure
time [hours
execution
time]
1 300
2 570
3 960
4 1290
5 1740
6 2100
7 2640
8 3090
9 3750
10 4500
11 5070
12 5970
13 6930
14 7680
15 8880
Calculate an approximation of the failure intensity per 1000-hour interval from 0 and
9000 hours. Draw a table. According to your experience, write down a rough estimate
of the failure intensity of a light bulb. Is the system better or worse than the light bulb
according to your estimate? Write down a short answer. (3)

Erik_Werner

Number of posts : 28
Age : 41
Team : 5, JSP
Group : Knowledge & Configuration Management
Registration date : 2008-09-22

Back to top Go down

Failure intensity Empty Re: Failure intensity

Post by Johan Rudberg Sun Oct 19, 2008 2:38 pm

The only thing I can imagine is:

Failure intensity: failures/time unit

3 2 2 2 1 2 1 1 1

But if someone knows, please fill in...

15/9 = 5/3 = 1.66 failures/ 1000 hours average...

Johan Rudberg

Number of posts : 3
Age : 42
Team : 7, JAVA
Group : Analytics & Requirements
Registration date : 2008-09-26

Back to top Go down

Failure intensity Empty Re: Failure intensity

Post by Erik_Werner Tue Oct 21, 2008 4:46 pm

Tack!

Erik_Werner

Number of posts : 28
Age : 41
Team : 5, JSP
Group : Knowledge & Configuration Management
Registration date : 2008-09-22

Back to top Go down

Failure intensity Empty Re: Failure intensity

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum