一种飞行模拟机运动系统的抖振特效建模方法

摘要

运动系统是构建飞行模拟机虚拟环境的主要分系统之一,抖振特效模拟是提高运动系统仿真度的重要研究内容.采用正弦加随机振动的基本模型,结合飞机试飞数据中的振动统计数据——加速度功率谱密度,建立抖振特效生成模型.研究基于加速度功率谱密度的抖振参数估计方法,实现正弦分量、随机分量参数的计算.分析典型飞行状态下的振动数据特性,研究抖振特效特征影响参数的提取方法,实现全飞行状态下的抖振特效生成.以抖振参数和特征影响参数为驱动,提出抖振特效的建模方法.实验结果表明,该方法能有效实现飞行模拟机系统中的抖振特效仿真.同时,也为虚拟现实技术其他应用中振动环境的构建提供一定的借鉴意义.%Motion system is one of the main subsystems of the virtual environment of flight simulators. Buffet simulation is an important content for the motion system to improve the fidelity. In this paper, a buffet model is established by using the basic model of sinusoidal and random hybrid vibration, combined with the acceleration power spectrum density (APSD) of the aircraft flight test vibration data. Based on the APSD, an estimate method of buffet parameters is studied to calculate the parameters of the sinusoidal and random components. The vibration characteristics of typical flight conditions are analyzed, and an extraction method of influence parameters is studied to achieve the buffet model under full flight condition. Driven by the buffet parameters and the influence parameters, a modeling method for the buffet analysis is proposed. The results show that this method can effectively simulate the buffet in flight simulator systems. Moreover, this study provides a reference for the construction of vibration environment in virtual reality technology.