Also included in the interface are indicators for certain values pertaining to the system at that iteration. In order to keep this variation realistic, you shouldn't set the standard deviation anything higher than 1. In order to provide a more realistic measurement of the level, randomness was introduced into the flow rate equation to account for small variations in flow. Next, you will need to set the standard deviation of the flow rate randomness curve. You should set this to a location on your computer's hard drive. One of the controls that will need to be set before the VI can run is the file path (see below). This panel is where you can comprehensively see how full the tank is at any given moment, and can change a few control factors of the code. When the VI is first opens up, the first panel to appear is the interface. This VI is used for testing the Response VI when it is not yet ready to risk testing with LHe. It takes into account randomness of flow and a constant rate of evaporation. The Measuring VI uses a predetermined flow rate equation to estimate the current level of the tank based on the valve position.If you need to know how to test in either of these environments, links to instructions can be found in the table of contents above. It can be run in a setting without LHe (in which it would use the Measuring VI to act as a level probe) or with LHe (in which an actual level probe would be measuring the amount of LHe in the helium reservoir in the nose and feeding that information into the Response VI). This is the larger of the two VIs and it interacts with the instrumentation involved, like the run valve itself. It reads the current level from the Measuring VI, and reacts in order to ensure that the level stays near a user-specified target level. The Response VI controls the run valve position.This is done by running two separate Virtual Instruments in unison, a Measuring VI and a Response VI.
LabVIEW is used to provide a means of automatically measuring and responding to the helium level inside the tank. The run valve has can have any position between 0 and 3 "turns", with 0 turns being completely closed and 3 turns being completely opened. The level of liquid helium is controlled by the position of the run valve, which allows it to flow from the separator to the nose (for more information on this process, follow THIS LINK and find Low Temperature: Cryogenics ). In order to control the amount of liquid helium in the system at any given moment, a user interface with the platform LabVIEW is needed.
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