基于竖向加速度响应的机场道面平整度评价及IRI标准反演

Evaluation and IRI Criteria Inversion of Airport Pavement Roughness Based on Vertical Acceleration Response

为了制定科学的机场道面平整度评价标准,提出一种基于竖向加速度响应的机场道面平整度评价方法并反演IRI标准。综合考虑飞机的竖向运动、俯仰和侧倾转动,建立6自由度的飞机整机动力学模型及振动平衡方程,并从飞机轮胎的几何滤波效应出发,采用"刚性滚子"轮胎接触模型的有效路形表征不平整道面;同时,构建飞机驾驶员、前舱位、后舱位和重心处的竖向加速度及其最大响应的计算模型,并采用Simulink仿真模块进行快速求解。以某代表C类飞机为例,在服从高斯分布的随机道面激励及不同滑行速度下,综合分析4个代表部位的最大竖向加速度响应的分布特性,建立其对应的非线性回归模型,并以波音公司疲劳标准为据,反演机场道面平整度的IRI标准值。结果表明:与现有标准相比,反演的IRI标准值更为宽松,且跑道的平整度标准比滑行道更严格,与实际中机场道面的平整度评价相吻合。

In order to develop the scientific roughness evaluation criteria for airport pavement, the vertical acceleration response （VAR） based roughness evaluation method and the inversion of IRI criteria are proposed. By considering the aircraft＇s vertical movement, pitch and roll rotation comprehensively, the kinetic model with 6-DOF and the mechanical equilibrium equations of aircraft are established, and the roughness pavement is characterized using the effective road profile in ＂rigid roller＂ tire contact model ＂because of the geometry filtering effect of aircraft tire. Meanwhile, the calculation models of VAR and maximum response at pilot seat, front cabin, rear cabin and center of gravity of aircraft are developed, and the solution are calculated rapidly using Simulink module. Taking a class C aircraft for example, under the conditions of pavement random excitation with Gaussian distribution and different taxiing speeds, the maximum VAR distribution characteristics of the 4 representative positions of the aircraft are analyzed comprehensively, and their corresponding nonlinear regression models are established. Finally, the IRI criteria value for the roughness evaluation of airport pavement are inverted according to the Boing＇s fatigue life criteria. The result shows that comparing with current criteria, the inversed IRI criteria is looser, and the roughness criteria of runway is more strict than that of taxiway, which shows good agreement with the evaluation of practice situation.