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首页> 外文会议>International Conference Complex Systems: Control and Modeling Problems >Modeling Heat Flow in Measuring Cell of Differential Scanning Calorimeter as a Control Object with Distributed Parameters
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Modeling Heat Flow in Measuring Cell of Differential Scanning Calorimeter as a Control Object with Distributed Parameters

机译：以分布参数为控制对象的差示扫描量热仪测量单元中的热流建模

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Modern differential scanning calorimeter (DSC) is a complex information-measuring system used to obtain different temperature and thermal characteristics of the investigated substances. The main subsystem of DSC is a heat block including heaters, measuring cells, and heat conducting elements. Measuring cells in the thermal block are often located symmetrically in relation to the center. However, the heat flow coming from the main heater affects them unevenly. At different overall parameters of reference and test substances uneven cells heating leads to measurement error increase. Since the defining of thermal characteristics of materials using DSC is carried out in a dynamic mode it is necessary to take into account not only the dependence of measuring cell parameters on time, but also the spatial distribution of the external thermal impact affecting it. Measuring cell DSC mathematical model is given as a block with a distributed input and concentrated output effect. The model takes into account the uneven spatial distribution of the thermal field in the thermal block, as well as heat removal from the substrate through the sensing elements considered to be inertial links. A structural model of the heat flow control system in a heat block DSC was constructed on the basis of the measurement cell mathematical model. The model shows the following: basic elements and their relationships, radiation influence on heat flow formation reaching the measuring cell and additional heat formation from micro aggregates, its influence on the measuring cell. After a number of experiments, a computer model of the automatic heat flow control system in the measuring cell of the differential scanning calorimeter DSC-500 was built as a control object with distributed parameters. This model serves as the basis for numerical experiments required to adjust the regulators parameters of the main and additional heaters in the thermal block of the DSC at different modes of this information-measuring system.
机译：现代差示扫描量热仪（DSC）是一个复杂的信息测量系统，用于获得所研究物质的不同温度和热特性。 DSC的主要子系统是一个加热块，包括加热器，测量单元和导热元件。热块中的测量单元通常相对于中心对称放置。但是，来自主加热器的热流会不均匀地影响它们。在参比物质和测试物质的总体参数不同的情况下，不均匀的电池加热会导致测量误差增加。由于使用DSC定义材料的热特性是在动态模式下进行的，因此不仅要考虑测量电池参数对时间的依赖性，还必须考虑影响它的外部热影响的空间分布。测量单元DSC数学模型以具有分布式输入和集中输出效果的块形式给出。该模型考虑了热块中热场的不均匀空间分布，以及通过被认为是惯性连接的传感元件从基板上散发的热量。基于测量单元数学模型，构建了热块DSC中热流控制系统的结构模型。该模型显示以下内容：基本元素及其关系，辐射对到达测量池的热流形成的影响以及微小聚集体产生的额外热量，以及对测量池的影响。经过大量实验，在差示扫描量热仪DSC-500的测量单元中建立了自动热流控制系统的计算机模型，作为具有分布式参数的控制对象。该模型作为数值实验的基础，需要在此信息测量系统的不同模式下调整DSC散热块中主加热器和附加加热器的调节器参数。

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