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为准确测量飞机不规则油箱内的燃油体积,在传统的查表插值法基础上,提出了基于等效传感器的自适应步长切割法(ASCM),用于建立燃油质量特性数据库,通过引入等效传感器概念,实现了不同姿态下多传感器的信息融合;该方法根据切片截面积的变化率调整切割步长,从而减小了燃油体积解算时的插值误差;利用多传感器的输出值实现了燃油平面的最小二乘(LMS)拟合,当有效传感器较少时,再结合等效燃油平面姿态角拟合燃油平面,消除了加速度对燃油平面的影响;对传统的三维查表插值法进行改进,减小了由于燃油平面姿态角插值引起的误差。基于UG二次开发,设计了燃油体积解算平台。实际油箱CAD仿真验证结果表明:该方法所建的数据库数据规模小,燃油解算速度快,实现了加速度和姿态误差修正,并减小了差值误差,进一步提高了燃油的测量精度。
In order to accurately measure the fuel volume in the irregular fuel tank of the aircraft, based on the traditional look-up table interpolation method, an adaptive step length cutting method (ASCM) based on equivalent sensors is proposed to establish a database of fuel quality characteristics. This method realizes the information fusion of multi-sensor under different attitude. This method adjusts the cutting step length according to the rate of change of slice cross-sectional area, so as to reduce the interpolation error when the fuel volume is solved. By using the output value of multi-sensor, When the effective sensor is small, the fuel plane is fitted with the fuel plane attitude angle to eliminate the influence of acceleration on the fuel plane. The traditional three-dimensional look-up table interpolation method Improvements to reduce errors due to fuel plane attitude angle interpolation. Based on secondary development of UG, a fuel volume calculation platform was designed. The actual oil tank CAD simulation results show that the data of the database built by the method is small in size and the fuel oil is calculated quickly, and the acceleration and attitude errors are corrected, the difference error is reduced, and the fuel measurement accuracy is further improved.