# User Portlet

Discussions |
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Have you considered using a `WhenEvent`? I had a [similar problem][1] once myself. Check out the [docs][2] as well. It would be nice if you posted the code so one can copy it at run it easily instead of screenshoting it. [1]:... |

The goal of the present problem is to be able to estimate the parameters $k$, $b$ and $m$ based on lists of known boundary conditions. This is what I have so far (*Constants*) g = 9.81; theta = {20,30,40}*(Pi/180); phi =... |

[b]Note: This question has also been posted... |

Hi, guys! I am to design a two step gearbox. The first step is to choose the number of teeth in each cog wheel in order to achieve a gear ratio of 17.3. In other words: (N1 N2)/(n1 n2) == 17.3where N1 and N2 are the number of teeth... |

@Otto Tronarp, that's awesome, however I am doing this for academic purposes and at this point I cannot use modeler |

Differential equation is given by y''[t]==-(g/L)*Sin[y[t]] where y is the offset angle and t is time. I used the following... |