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shanky456

TABLED1 data entry

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Please help me on TABLED1 entries. I am not able to understand how to assign values in this table (help is not clear). If I want to assign random values can I do it or not. Say in Element flux I want to enter values as 


 


for time = 0 sec value is 4.2


for time = 4 sec value is 0


for time = 4.5 sec value is 4.2


for time = 8 sec value is 0


for time = 8.5 sec value is 4.2. and so on to say 16 sec or 24 sec or more. 


 


Can I input these types of random values to TABLED1 Card or not. 


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Hi,


From Help:


 




Discontinuities may be specified between any two points except the two starting points or two end points.  For example, in Figure 1 discontinuities are allowed only between points x2 through x7.  Also, if y is evaluated at a discontinuity, the average value of y is used.  In Figure 1, the value of y at x = x3 is y = (y3+y4)/2.



3.

At least one continuation entry must be specified.




 


Can you make changes to your table as per the above and check if you can get results you desired?


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Thanks for the reply sir. I have to apply a heat flux as (Need to apply this practically as per the problem statement) 


 


at time = 0 sec, Heat Flux = 4.2e6 W/m2


at time = 4 sec, Heat Flux = 0 W/m2


at time = 45 sec, Heat Flux = 0 W/m2


 


1. What I have entered in TABLED1 is


 


x1 = 0, y1 = 1 (Linear)


x2 = 4, y2 = 0 (Linear)


x3 = 45, y3 = 0 (Linear)


 


After I entered these I didn't get the right results.


 


2. And when I give values as below still didn't get the correct results:


 


x1 = 0, y1 = 4.2e6


x2 = 4, y2 = 0


x3 =45, y3 = 0


 


Maybe there is something else wrong in my model but I first want to conform this whether this is correct or not the above two tables which I input.


Please give your inputs

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Hi,


 


can you make the following changes and check if you are able to get results?


 


x1=0  y1=4.2e6


x2=2  y2=4.2e6


x3=4  y3=2


x4=20  y4=0


x5= 40  y5=0


x6=45  y6=0

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I have tried the above values it didnt work out sir. The values of temperature are in 9.99e5 ranges. May be something is terribly wrong in my problem but I have used the same procedure as given in tutorial OS-1090. Please suggest me something. Working on brake disc transient thermal behaviour. Boundary condition are ambient at 22 degree. Covection through disc surface. And heat flux on both discs. I can share model with you if you want.

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Hi Prajwal,

 

Could you please let me know what is the objective of such setup?

 

Modal analysis is not time dependent. 

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As the error clearly indicates there are discontinuities in the table.I presume you have two different load values at the same time/frequency which is not allowed.

Please check the time data and filter it out to a valid input. If x is identical, you get an error. 

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I work on frequency domain and I have not data on time domain

when data on convert to any plot I cannot see any discontinuities

on the other hand, I have only material datas for frequency dependent materials which you know

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