Simple pendulum graph

[altenbach]

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@helloworld1111111 wrote:

I wired the empty array constant to the property node however, the code won't run because it states that the property node contains unwired or bad terminal. 

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You again did not use "save for previous" and I cannot look at your code at the moment.

[helloworld1111111]

sorry about that. I've attached it here 

[altenbach]

Your property node is not linked to the chart.

You either need to wire a reference of the chart to the upper input or right-click.. link it to the chart (see picture).

Also:

• Do NOT set the x and y scales to autoscale! Set the scales such as dx and dt have the same number of pixels. (else the pendulum distorts as a function of angle)
• Do not reverse the x-axis of the chart.
• never ever delete the label of a control (e.g. the stop button). If you don't want to see it on the front panel, change the visibility (right-click...visible items...label). An empty string is a very (very!!!!) poor label. On the diagram, the label should always show!
• Don't make filenames that have multiple periods (pendulum..) or <space"." (FINAL .vi) before the extension.
• Never ever call a file FINAL, because it never is! 😄
• etc.

 

[altenbach]

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@altenbach wrote:

• Never ever call a file FINAL, because it never is! 😄

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Many decades ago, a student from South America thought he had to do exactly one more experiment to complete the dissertation. The Nicolet 1280 computer to control the instrument only supported 6+3 filenames, so he named the result ULTIMO.000.

Suffice to say, a few weeks later he was up to ULTIMO.051 with more experiments to do 😄

[helloworld1111111]

understood. thank you.

I understand that your vi is one way of implementing damping. but if someone wanted to implement damping using the below equation, how would it look like? (alpha being the damping coefficient)

[altenbach]

You can calculate t from the value of the iteration terminal and the loop rate. Together with alpha and the undamped amplitude, that is sufficient to solve your formula for the damped amplitude at any given elapsed time. Simple math!

[helloworld1111111]

I tried doing this but it's not working and there is nothing showing up on the damped chart. Could it be a problem with the graph itself like its X and Y scale? I've attached an image of the block diagram here

[altenbach]

I cannot run or debug a picture.

I am also pretty sure that you should multiply i with a much smaller number than 1. Cosine takes radians and your steps are way too wide.