The data output from Trick was then compared to the output from Simscape and found to be within acceptable limits. When the models were performing as expected, it was necessary to generate code from the models and run them in Trick (a real-time simulation program). Once completed, the components were added to models, where filling and draining the tanks could be simulated. It was decided that, for these cases, it would be preferable to create a custom library component to represent each case, using the Simscape language. ![]() It was not possible to construct a model for a spherical tank, using library components, due to the variable area. ![]() Using library components, it was possible to construct a rough model for the cylindrical tank. In order to model a closed- volume variable ullage pressure tank, it was necessary to consider at least two separate cases: a vertical cylinder, and a sphere. The library for Mathworks Simscape does not currently contain a model for a closed volume fluid tank where the ullage pressure is variable. Simscape Modeling of a Custom Closed- Volume Tank In order to accurately monitor solids over time across various cleaning campaigns, and provide a technical basis to support final waste tank closure, a consistent methodology for volume determination has been developed and implemented at SRS.« less This method relies on video and still digital images of the waste tank after the liquid transfer is complete to obtain the relative height of solids across a waste tank in relation to known and usable landmarks within the waste tank (cooling coils, column base plates, etc.). The post transfer method is primarily utilized after the majority of waste has been removed. The task is performed during a transfer because the liquid level (which is a known value determined by a level measurement device) is used as a landmark to indicate solids accumulation heights. These methods are: liquid transfer mapping / post transfer mapping and final residual solids mapping. There are two methods that can be used to create a solids volume map. Currently, mapping is performed remotely with closed circuit video cameras and still photograph cameras due to the hazardous environment. Jason Martin, Bruce A.Ībility to accurately determine a volume is a function of the quantity and quality of the waste tank images. ![]() In a passive system, the relationship of specific densities can be obtained.Įstimating Residual Solids Volume In Underground Storage TanksĭOE Office of Scientific and Technical Information (OSTI.GOV)Ĭlark, Jason L. ![]() The method is also applicable to determination of gas volume by utilizing work (W) in the compression process. From the isothermal pressure change (delta iso) the gas volume is obtained. The measurements are utilized in an idealized formula for determining the change in isothermal pressure (delta P sub iso) for the gas. (Inventor)Ī method is disclosed for determining the volume of compressible gas in a system including incompressible substances in a zero-gravity environment consisting of measuring the change in pressure (delta P) for a known volume change rate (delta V/delta t) in the polytrophic region between isothermal and adiabatic conditions.
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