Research On Temperature Control System Of Gravimeter Based On Fuzzy PI Control

Airborne gravity measurement system is based on the dynamic platform as the carrier,through the output of inertial devices to determine the regional gravity field,airborne gravity measurement is faster,wider and lower cost than traditional gravity measurement,and it has no space constraints,it provides a very convenient way for the construction of gravity reference network,and in the past 20 years,it is one of the hot spots on the field of gravity measurement.The strapdown air gravimeter developed by National University of Defense Technology is the first one that has completely independent intellectual property rights of gravity.Based on the temperature control system,precision temperature control circuit,temperature control model and temperature control method of airborne gravimeter,the main research is as follows:(1)According to the characteristics of airborne gravimeter,the influence of temperature on the measurement of airborne gravity is analyzed.Through the thermal analysis of temperature control system,Three kinds of radiators of different sizes are modeled and optimized,which provides a theoretical basis for heat sink selection of temperature control system.(2)This paper has made some theoretical error analysis and developed a high-precision temperature measurement circuit,based on the error analysis,the type and precision of the critical power supply chip power and precision resistance has been determined,ultimately through the simulation,the precision devices has been determined,and under the selected devices,a temperature test has done,after all,the temperature measurement circuit precision can reach 0.02?,it meets the needs of industrial production and a number of precision instruments.(3)According to the principle of heat transfer,the multistage heat transfer model of temperature control system is established.The influence of each parameter on the temperature control system was analyzed by MATLAB,and then the control model of the temperature control system was determined by system identification,which provided the theoretical basis for the control method of temperature control system.(4)Designing a Fuzzy PI controller for the airborne gravimeter,comparing with the tranditional PI controller,then gained some useful conclusions.