System Modeling And Characteristic Analysis Of Gyrowheel

The background of this paper is the research of the tiny spacecraft attitude controlsystem. The research object is a new type of spacecraft attitude control component,gyrowheel. This paper derives its dynamic model, analyzes common mechanical factorsaffecting its performance, designs its system controller, and analyzes the characteristicsof various factors on the gyrowheel angle tracking.First of all, on the basic of the analysis of mechanical structure and operationprinciple, get the force analysis of the rotor of gyrowheel. According to the Eulerkinetics equation, the dynamic model of gyrowheel is derived. The torque in the Eulerdynamic equation is from theoretical analysis, so its physical meaning is clear.According to the established dynamic model, calculate the response in time domain,analysis simulation results, then conclude dynamics features of gyrowheel. UseSimMechanics to build the mechanical simulation model of gyrowheel. Use thedynamics model and the mechanical simulation model to prove that they are right. Themathematical model of Euler dynamic equation can reflect the characteristics of thegyro wheel linearly when the angle range is0~7degree.Then, analyze many common mechanical factors influencing gyrowheel dynamiccharacteristics in the system implementation. The non-perpendicularity of drive shaftand inner flexible shaft is analyzed,The non-perpendicularity of inner and outer flexibleshaft is analyzed and it has little influence of the precession feature. Analyze theinequality of two gimbal ring axis elastic stiffness and its influence on the gyrowheelperformance. Through the concept of correlation coefficient, nutation frequencycomponent amplitude and double frequency amplitude is proportional to residualstiffness. Analyze the static and dynamic unbalance of the gyrowheel and its influence.Get the formula for the static dynamic unbalance in the ground environment.Finally, the paper analyzes the precession control. The paper analyzes the twogyrowheel decoupling control method that is compatible for engineering practice.Choose the zeros poles decouple control situation. Design the controller and realize theangle track function. Research the response of the ramp signal, the sine signal and theinterference under the control system. Analyze the speed for the influence of the angletracking characteristic and static and dynamic unbalance for the influence of the angletracking characteristic.