Development Of Dynamic Calibration Setup For Engine Thrust Vector Measurement System

The trajectory-controlled engine is an important part of a XXX power engineering system. The inclination and offset of the actual engine thrust will directly affect the precision of the flying control and the target hit in flying experiment, even may lead to failure. To overcoming those problems, the eccentricity of the trajectory-controlled engine thrust must be controlled strictly. Accordingly it is very significant to develop a corresponding thrust vector measurement system of the trajectory-controlled engine.In this thesis, the undergoing engine thrust vector measurement system is introduced, and two trapezoidal dynamic force generators, which is the vibration exciter method and the proportional electromagnet method respectively, are simultaneously developed, in order to carry out the thrust vector measurement system's dynamic calibration. The thrust vector measurement system is made up of 4 three-component piezoelectric force transducers. Used the output of each force transducer, the thrust vector eccentricity parameters can be calculated by some deduced expressions. The dynamic force generators are based on a same principle that an electrified inductor will be affected by induced force in a magnetic field. The vibration exciter is used as the executor in the vibration exciter method to get the needed dynamic force with the corresponding signal generator and power amplifier. The signal generator is made up of the single chip AT89C51 and can get some kinds of signal with the C51 program language. Moreover, considering the needed lateral dynamic force is small and the vacuum module room is limited when the measurement system is used in the engine altitude simulation test, so the proportional electromagnet method is given. Due to the proportional electromagnet's large inductance, the simulate software Multisim2001 is applied to acquire the theoretic drive signal, that is a step voltage signal. With the step voltage signal, the trapezoidal dynamic force can realize by the proportional electromagnet.The experiments show that the principle for the standard dynamic force generator is correct, and the actually acquired trapezoidal dynamic force in the experiment has attained the anticipant goals, and the force generators build the foundation for the further dynamic calibration study on the thrust vector measurement system of the trajectory-controlled engine.