moses time domain analysis

Hi Georgina,

What are the other options which change the seeds?

What are the values of seeds to be used? I checked Moses files and found TB=18000 is used with all -t_reinforce options.

Best regards,

Ahmed 

Hi Ahemed,

Thank you for your question.  Yes, -t_reinforce is the option for setting the seed.

I have also seen people use the "-time tobserv delta_time ttra_set ncycle" to control when the maximum environment occurs.

I do not understand your question.  The default is TB = 18,000.  Maybe we need to define what is "seed".

From Wikipedia, "A random seed is a number used to initialize a pseudorandom number generator."  MOSES is using the TB, seed, to pick the phases of the frequency components.  We try to model a random sea.  The phases are what we are trying to make random.

I hope this helps.

georgina

Don't forget that if using -t_reinforce, TB must be a high number (i.e. larger that the simulation time), since at this point all the Fourier components add up and creates a huge wave - if I recall correctly.

Hi,

based on mp_moor, i tried to input different values of t_reinforce,TB. 

T_REINFORCE = T_REINFORCE IS NOT ADDED IN &ENV
MAX = 100.14 99.48 99.40 99.73 152.48 179.99 180.15 148.42
PRED_MAX = 105.33 106.46 106.25 104.72 164.01 198.05 198.02 158.44
MAX_MEAN = 13.84 18.00 17.84 13.32 31.64 48.54 48.40 27.85
PRED.MAX_MEAN = 19.02 24.98 24.69 18.32 43.17 66.61 66.28 37.87

T_REINFORCE = 0
MAX = 99.93 99.55 99.57 99.74 145.62 169.80 170.59 145.36
PRED_MAX = 104.91 106.14 106.10 104.55 155.10 184.34 185.36 154.79
MAX_MEAN = 13.28 17.45 17.42 12.93 25.65 39.64 40.26 25.53
PRED.MAX_MEAN = 18.26 24.04 23.95 17.74 35.12 54.18 55.03 34.96

T_REINFORCE = 5
MAX = 101.92 102.27 102.29 101.55 145.57 172.38 172.24 145.25
PRED_MAX = 107.75 110.13 110.14 107.23 154.68 187.38 187.12 154.30
MAX_MEAN = 15.49 20.37 20.34 14.97 24.83 40.89 40.56 24.65
PRED.MAX_MEAN = 21.32 28.23 28.19 20.65 33.94 55.88 55.44 33.70

T_REINFORCE = -5
MAX = 101.92 102.27 102.29 101.55 145.57 172.38 172.24 145.25
PRED_MAX = 107.75 110.13 110.14 107.23 154.68 187.38 187.12 154.30
MAX_MEAN = 15.49 20.37 20.34 14.97 24.83 40.89 40.56 24.65
PRED.MAX_MEAN = 21.32 28.23 28.19 20.65 33.94 55.88 55.44 33.70

T_REINFORCE = 10800
MAX = 94.31 91.20 91.58 94.46 136.09 155.83 155.66 136.16
PRED_MAX = 97.56 95.25 95.81 97.71 141.51 164.88 164.57 141.67
MAX_MEAN = 8.87 11.04 11.36 8.80 15.06 24.31 23.95 15.30
PRED.MAX_MEAN = 12.12 15.09 15.59 12.05 20.47 33.35 32.86 20.80

My question is to follow guideline from BV 493-NR, i need n=5 and i believe the option T_REINFORCE 5 is the correct way to do it? Since moses cant produce result of Tk of each seed (elementary wave), how can i calculate the value for 

Tm : Mean of the n maximum values of Tk? Is the given Max_mean Value = Tm?  I hope you understand my question.