Research On Tank Constant Temperature Control System Of Independent Circulation

With the development of science and technology,whether it is in the field of industrial production or scientific research,issues related to temperature control are very worthy of attention.The influence of temperature on various fields such as engineering vehicles,military equipment,and machine tool industries is one of the factors that cannot be ignored.Aiming at the important problems of low precision,slow response speed,and poor temperature field uniformity in the current hydraulic oil constant temperature control method,this paper innovatively proposes an independent circulation type constant temperature control method for the oil tank,which avoids the problems caused by the traditional immersion heat exchange.The local temperature is too high or too low,and the temperature field distribution of the fuel tank is not uniform,resulting in inaccurate measurement of the temperature sensor,which ultimately affects the control accuracy of the constant temperature state.In order to improve the accuracy of constant temperature control,the characteristics of PID controller and fuzzy controller are analyzed in this paper.PID controller has better effect in linear control system and has relatively fast response speed.Fuzzy control has certain advantages in nonlinear control system.Therefore,it is considered to combine the two methods in the fuel tank thermostatic control system.In order to analyze the performance of fuzzy PID control,the simulation model was established and compared with PID control,and the analysis of interference anti-interference ability was introduced at the same time.From the simulation results,it can be seen that the fuzzy PID control has fast response speed,strong robustness,and strong anti-interference ability.In order to verify the effectiveness and reliability of the independent circulation structure fuel tank constant temperature control system,Solid Works was used to model,and ANSYS Fluent software was used to simulate the heat exchange modes of three structures of immersion type,ordinary circulation type,and circulation type serpentine heat exchange.,respectively set 6 temperature monitoring points inside the box to observe the temperature change of each point,and extract a part of the effective temperature data to analyze the uneven temperature distribution coefficient at different times,and analyze the change trend of the coefficient,and compare the results through simulation.It can be seen that the temperature non-uniformity of the independent circulation structure using the serpentine tube is significantly lower than that of the other two methods.Finally,the independent circulating fuel tank constant temperature system is tested and verified,and the heating and cooling process,the static error of the constant temperature state,the temperature unevenness,and the measurement uncertainty are analyzed.The results show that the temperature control response speed is fast,and the constant temperature state is reached.The static error is kept ±1.5°C,the temperature non-uniformity coefficient reaches0.0151 at 600 s,and it still has a downward trend after that,and the measurement uncertainty reaches 0.149 to meet the measurement requirements.At the same time,the relative error analysis of the FLUENT simulation results and the test results of the third scheme is carried out.The calculation shows that the maximum relative error reaches 4.2%,and the error is small,which shows that the simulation results have certain reliability.Therefore,the independent circulating fuel tank constant temperature control method using the fuzzy PID control strategy is feasible,and the control accuracy has reached the B-level requirements of the national GB/T 7935-2005 standard.