Temperature control of CFRP induction heating based on improved particle swarm PID
The application of carbon fiber composite materials(CFRP)in daily life is becoming increasingly widespread.The traditional curing and molding method has a slow heating rate,high energy loss,and serious pollution.Therefore,electromagnetic induction heating method to heat CFRP was usesd.However,due to its composite structure and induction heating characteristics,CFRP generates heat from the fiber texture and gradually diffuses outward,resulting in a certain lag in the temperature field changes during its heating process.A finite element micro model of CFRP based on its equivalent electromagnetic thermal characteristics was established,the heating mechanism,temperature field distribution,and hysteresis of surface temperature of CFRP with plain weave structure during the heating process were systematically analyzesd.At the same time,a macroscopic laminated model was estab-lished to simulate and calculate the interlayer heat conduction process and the hysteresis of interlayer temperature conduction in CFRP,revealing the heat generation of CFRP plates under induction heating and the heat conduction law between fibers and resins,and verifying the hysteresis of temperature changes in CFRP during induction heating.Therefore,a particle swarm PID control method based on improved inertia weight parameters was proposesd,which reduced temperature overshoot during material heating process,improved anti-interference ability during heating process,and through experiments that the algorithm has good temperature control effect on CFRP flat plates with different heating temperatures and thicknesses during induction heating process was verified.
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