Design And Research Of Temperature Control System For Hemispherical Resonant Gyroscope

The hemispherical resonant gyroscope is a new type of gyroscope without rotating parts.It has a wide range of applications in aerospace inertial navigation systems,automation control and other fields.The hemispherical harmonic oscillator is the core component of the hemispherical resonant gyroscope.Changes in temperature will cause changes in the relevant physical parameters of the hemispherical harmonic oscillator,which in turn causes the natural frequency of the hemispherical harmonic oscillator to change,and its natural frequency is related to the output of the hemispherical resonant gyroscope.The change in natural frequency will cause the hemispherical resonant gyroscope to drift during use.In order to ensure the output accuracy and working stability of the hemispherical resonant gyroscope,it is necessary to control the working environment temperature of the hemispherical resonant gyroscope at a constant value so that the output is not disturbed by the ambient temperature,thereby suppressing thermal drift.The purpose of this subject is to study and design a temperature control system to make the hemispherical resonant gyroscope work in a constant temperature environment.The thesis first briefly introduces the structure and working principle of the hemispherical resonant gyroscope,analyzes the influence of temperature effects on it,understands the causes of thermal drift of the hemispherical resonant gyroscope,and then determines the overall design plan,because the high-precision temperature measurement is temperature control The research foundation and prerequisites of the system to ensure accuracy,so the paper analyzes the selection,calibration,accuracy improvement and measurement error of the temperature sensor in more detail.The system hardware design is mainly concentrated in the two parts of the thermostat and the control box.The thermostat is mainly used to place the hemispherical resonant gyroscope and provide an environment for its work;the control box is the core of the system design,which realizes the control of the thermostat through the oil circuit system.Heating and cooling create a constant temperature environment for the hemispherical resonant gyroscope in the constant temperature box,as well as real-time collection and adjustment of data during the control process.The system software design is divided into two parts: the upper computer and the lower computer.The distributed operation mode is adopted as a whole.The functions of the upper computer are mainly human-computer interaction,interface visualization,data recording and storage,etc.;the lower computer is mainly responsible for data collection,conditioning and core control.Algorithm implementation.In terms of control methods,this subject proposes the use of transformer oil as a temperature control carrier instead of electric heating to achieve system temperature control,which effectively eliminates the influence of electromagnetic interference on the work of the hemispherical resonant gyroscope.In the control algorithm,PID control combined with the self-tuning parameters of the relay feedback method is the core of the algorithm,and the conventional single-stage PID control mode is improved to become a two-stage control mode.The heating link and the cooling link participate in the control at the same time,and coordinate the work.,To ensure control accuracy,and finally use Lab VIEW software to program design to achieve a complete algorithm function.The simulation experiment and system operation results show that the design can meet the technical requirements,and the temperature control accuracy can reach ±0.05℃,which provides a stable constant temperature environment for the work and performance test of the hemispherical resonant gyroscope.