The Study On In-circuit Emulation In Tight Transportation Experiment System

As the 'Qing-Tie petroleum pipeline' emulation system and 'Qin-Jing petroleum pipeline' emulation system had been built, the pipeline emulation technic has obtained great achievement in China. But the pipeline emulation information was outmoded, the pipeline and the emulation system were divided. How to unite the pipeline and emulation hadn't carried out substantial research.The paper is aimed at analyzing investigation of the Tight Transportation Experiment System which in Petroleum Storage and Transportation Lab of Daqing Petroleum Institute. In order to make it displayed more effectively, as research object for availability pipeline system. Analyzed the hydraulic characteristics of the piping system and the pipeline process under different conditions according to the actual measurement of pipeline parameters and Date Acquisition System Laboratory (DasyLab) acquired the pipeline hydraulic parameter respectively. Regressed the characteristic curve of the pump according to the experimental data. Calculated the fluid's kinetic energy, the fluid's potential energy, the pipeline's friction loss in the systems utilized Bernoulli's equation. According to the energy conservation law, obtained the differences between the systems' actual measured value and the DasyLab acquired hydraulic parameter. By analyzing and testing, discovered that the differences between the two sets of parameters are caused by interference signals existed in the system. Obtains from the three essential factors of disturbance, mainly studied the effect of the system signal by frequency converter, electromagnetic current meter, current source and electric motor which produced Interference signal; Researched the measures of eliminating the system's signal interference such as assembling screening can on the frequency converter and motor, connecting to ground deeply, utilizing double screening on the signal line, utilizing twisted pair twisted on the cable line which can Reduce the error when the DasyLab acquaints parameters. According to the voltage signal obtained by the DasyLab, combined with the pipeline's actual pressure, rate of flow and other parameters to calculate, fitting a new semaphore formula by least square method (LSM), translating the form that a Semaphore calculating formula corresponds to a number of acquisition parameters to the form that a Semaphore calculating formula corresponds to an acquisition parameter. Optimized data's Acquisition and Control made the parameters acquainting more accurately than before. Finally combining the SQL Server data base and DasyLab data acquisition and control system, worked out the pipeline in-circuit emulation software. It realized the interior laboratory pipeline in-circuit emulation.