Measurement Of Control Surface Hinge Moment With Piezoelectric Quartz

Development of aviation technology raises increasing demand for security, stability, maneuverability and reliability of the aircraft, and presents new challenges to the levels of aircraft design and manufacturing technology. The various aircraft rudder is adjusted to accomplish aircraft takeoff, veer and decline operation, and in the adjustment process, the rudder surface would been applied by torque. If the stiffness and strength of the rudder surface do not meet the requirements, the rudder will fail, and it cannot achieve aircraft security requirements. Therefore, in aircraft design, it is important to design rudder with sufficient rigidity, and design stiffness of rudder has relationship with the size of the hinge moment, so the rudder hinge moment is one of the most important parameters of aircraft design. Therefore, accurate measurement of the rudder hinge moment is important for the aircraft design.In this paper, based on previous research on measurement techniques and equipment of the rudder hinge moment, and rudder hinge moment wind tunnel balance, piezoelectric rudder hinge moment measuring device and its calibration technology are studied in depth, whose sensing element is piezoelectric quartz crystal.In the aspect of rudder hinge moment measurement, based on good dynamic characteristics of piezoelectric quartz crystal, piezoelectric rudder hinge moment measuring device whose sensitive element is piezoelectric quartz crystal is designed. Based on the forces that are applied on the measuring device, piezoelectric quartz group with dual-electrode structure is designed, and measurement principle theoretical that is based on Mechanics of Materials is analyzed, and the potential distribution and electric field intensity of piezoelectric quartz crystal are analyzed with ANSYS. Aspects of the structure of the piezoelectric rudder hinge moment measuring device, internal structure of the measuring device is excellent, which ensure the aerodynamic loads transfer effectively, and the piezoelectric quartz group is integrated to the interior of measuring device, which increase the utilization of the interior space of the measuring device. As for measuring devices critical components, by using the way of combining theoretical analysis calculation and simulation analysis, the key components and the strength of the piezoelectric quartz group is checked. The side of simulation, calculation modal of measurement device is analyzed by using ANSYS, and the analysis results show that it meets the requirement of the wind tunnel experiments. In static and dynamic performance of piezoelectric quartz group respect, static and dynamic calibration experiments platform are designed and built, and static and dynamic calibration experiments are completed, and static and dynamic calibration curve and the corresponding parameters of piezoelectric quartz group are obtained, and preparing for subsequent calibration experiments of measuring device. Finally, aimed at the static characteristics of the rudder hinge moment measurement device, the static calibration experiments of measuring device is designed, and the static characteristics of the measuring device meet the requirements, and it lays the foundation for the measuring device dynamic calibration experiments and wind tunnel experiments.The piezoelectric rudder hinge moment measuring device that is presented in this paper has advantage over strain rudder hinge moment wind tunnel balance, and it can be applied to wind tunnel experiments and other forms of hinge moment measurements, and to prepare for the subsequent hinge moment measuring device wind tunnel experiments, while providing a theoretical support and reference for the development of piezoelectric wind tunnel balance.