A Hybrid Modeling Method for Vortex Composite Machine
A hybrid modeling and compound machine technology, applied in computer-aided design, instrumentation, geometric CAD, etc., can solve the problems of low equipment cost, many parameters, and few sensor elements, meet the requirements of high installation conditions, reduce equipment costs, The effect of improving design accuracy
Active Publication Date: 2019-03-19
SHANDONG UNIV
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[0006] In order to solve the deficiencies in the prior art, the present invention discloses a hybrid modeling method of a vortex compound machine, which takes into account both accuracy and engineering practicability, and the built model can solve the problem of the original vortex compound machine model structure Complexity, many parameters, high degree of nonlinearity, unsuitability for engineering applications, few sensor elements and low equipment cost, etc., it is convenient to analyze the energy conversion performance of the vortex compound machine and improve the design accuracy of the controller
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[0040] The present invention is described in detail below in conjunction with accompanying drawing:
[0041] The invention provides a hybrid modeling method of a vortex composite machine, such as figure 1 The overall flowchart of the modeling method shown, the specific implementation includes the following steps:
[0042] First execute step S1, analyze the operation process of the vortex compound machine, comprehensively consider the thermodynamic model, process leakage, heat dissipation, friction and other factors, and write the mechanism equation of exhaust temperature, exhaust flow and load torque in parallel. The specific method is as follows:
[0043] Assuming ideal gas conditions, analyzing the operation process of the vortex compound machine, it is found that there are obvious phenomena such as gas leakage, heat dissipation and friction. These factors cannot be ignored and seriously affect the accuracy of the mixing model of the vortex compound machine. The present inv...
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The invention discloses a hybrid modeling method for a vortex type compound machine. The method comprises the following steps of listing and writing mechanism models of exhaust temperature, exhaust flow and load torque by considering process leakage, heat dissipation and friction factors according to a running process of the vortex type compound machine; selecting input and output variables to perform parameter lumping: selecting a rotary speed and a back pressure that are easy to measure and control as the input variables, and selecting the exhaust temperature, the exhaust flow and the load torque as the output variables; identifying unknown parameters in the mechanism models by adopting a genetic algorithm and an auxiliary variable method; and identifying and correcting the unknown parameters in the mechanism models to obtain a hybrid model of the vortex type compound machine, and keeping an error between an identification result and experimental data in a set range. According to the hybrid modeling method, by building the model, the energy conversion performance of the vortex type compound machine can be conveniently analyzed, the design precision of a controller can be improved, the energy loss caused by sensor elements is reduced, and the device cost is greatly lowered.
Description
technical field [0001] The invention relates to the modeling field, in particular to a hybrid modeling method of a vortex composite machine. Background technique [0002] Due to its special structure, the scroll compound machine has the advantages of less parts, compact structure, low noise, low vibration, high efficiency and high reliability compared with other types of compressors and expanders. It is widely used in refrigeration, In the fields of automobiles and fuel cells, in recent years, it has received attention in micro-compressed air energy storage systems and organic Rankine cycle systems. The vortex compound machine has great development potential in the industrial field, and the establishment of a reasonable and effective model for it is conducive to improving the industrial application value of the vortex compound machine. [0003] The existing vortex compound machine modeling methods are mainly divided into two categories: mechanism model and empirical model. ...
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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/367G06F2119/06G06F2119/08
Inventor 张承慧李珂马昕汉田
Owner SHANDONG UNIV