平流层验证飞艇横侧向模型辨识研究

摘要

The identification process of lateral dynamic model of the stratospheric validate airship was presented based on real flight data. To solve the problem of the disturbance of wind and measurement noise, the strategy using filter error method to identify the stability derivative and control derivative of airship model was proposed. Firstly, we simplified the lateral model to identify the stability derivative and control derivative of airship model for the mass and inertia's variation. Then, as the motion of the airship was strongly affected by wind effects, the filter error method of parameter identification was applied in the identification, and the flight experiment was designed according to the a-nalysis of the airship lateral motion characteristics. Finally, the airship lateral model was identified and verified by multiple sets of experimental data.%研究采用系统辨识方法建立平流层验证飞艇横侧向模型,针对飞行试验中风的扰动和测量噪声明显,对辨识参数的精度有影响.为解决上述问题,提出了采用滤波误差法,辨识稳定微分和控制微分系数的策略,获得飞艇较精确的平飞横侧向模型.首先考虑飞艇为浮力体,质量和惯量受环境影响较大,很难精确测量的问题,将飞艇非线性模型转化为具有稳定性微分和控制微分的飞艇横侧向线性模型,辨识参数不受质量、惯量变化的影响,并采用滤波误差方法,辨识模型的稳定微分和控制微分,可以减小风的扰动误差对辨识精度的影响,最后用辨识模型进行飞行仿真,将仿真得到的数据和实际飞行试验数据进行对比分析,结果表明,辨识得到的模型可以较好地反映飞艇的动力学特性,可为飞艇偏航控制器的设计提供参考.