Extracting Events from One Signal, applying Time to Another

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  • #12568
    John HuxtableJohn Huxtable
    Mitglied

    I have speed data from two fans. I use a formula to calculate the difference between them and event isolation to determine times when this difference is greater than +/- 30 rpm.

    I then wish to use the associated time stamps to observe the vibration responses when the fan speed difference is greater than +/- 30 rpm.

    The raw data are in separate signals but all have the same time base. I am using version 8.0.24 standard

    #8231
    John HuxtableJohn Huxtable
    Mitglied

    I have speed data from two fans. I use a formula to calculate the difference between them and event isolation to determine times when this difference is greater than +/- 30 rpm.

    I then wish to use the associated time stamps to observe the vibration responses when the fan speed difference is greater than +/- 30 rpm.

    The raw data are in separate signals but all have the same time base. I am using version 8.0.24 standard

    #8914
    Bernhard KantzBernhard Kantz
    Moderator

    For this you can use the index operator.

    Example:

    
    Dim idx = ValuesInInterval(Speed1 - Speed2, -30, 30, EVENT_INDEX + EVENT_COMPLEMENT)
    Speed1.X[idx]
    

    support@weisang.com

    #8915
    John HuxtableJohn Huxtable
    Mitglied

    I think I see how that gets me the time stamps in “speed1” but how do I apply this to “response1”?

    #8916
    Bernhard KantzBernhard Kantz
    Moderator

    If you have a FPScript formula IDX which calculates the indices you can create an additional formula. This formula creates a signal with the y-values of the data set ‘response1’ and the x-values of ‘speed1’.

    
    Signal(response1[IDX], speed1.X[IDX]
    

    support@weisang.com

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