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提出一种采用国际平整度指数(IRI)评价机场道面平整度的适用性综合分析方法,建立了1/4车辆模型与飞机的动力学模型,采用IRI和飞机重心处竖向加速度(VACGA)作为机场道面平整度的评价指标,利用MATLAB/Simulink建立了IRI和VACGA求解模型;以正弦函数形式的不平整激励模拟机场道面纵断面的微波起伏,在不同振幅、波长和滑行速度条件下定量解析IRI和VACGA的分布特性。计算结果表明:VACGA和IRI均与振幅成正比;IRI的敏感波段为波长1~5m的短波,并在波长为2m时达到最大;飞机在200km·h~(-1)滑行速度下,VACGA随波长的变化呈现3个波峰,并且在波长为15m时达到最大波峰;当飞机在滑行道的滑行速度小于40km·h~(-1)时,VACGA的敏感波段为2.3~7.2m,基本分布在IRI的敏感波段内,说明滑行道平整度的评估可采用IRI,但当飞机在跑道的滑行速度大于60km·h~(-1)时,VACGA敏感波段为6.4~23.6m,分布在IRI不敏感波段内,说明当飞机在跑道的滑行速度较高时,采用IRI检测机场道面平整度是不合理的。
This paper presents a comprehensive analysis method of airport flatness using International Flatness Index (IRI), and establishes a 1/4-vehicle model and aircraft dynamics model. Using IRI and vertical acceleration at the center of gravity (VACGA) As an evaluation index of airport surface smoothness, the IRI and VACGA models were established by using MATLAB / Simulink. The irregular wave excitation in the form of sine function was used to simulate the fluctuation of the vertical profile of the aerodrome. Under different amplitude, wavelength and gliding speed Quantitative analysis of the distribution characteristics of IRI and VACGA. The calculated results show that the VACGA and IRI are proportional to the amplitude. The sensitive band of IRI is the shortwave with the wavelength of 1 ~ 5m and reaches the maximum at the wavelength of 2m. With the glide speed of 200km · h -1, VACGA When the taxiway taxiing speed is less than 40km · h -1, the sensitive band of VACGA is 2.3 ~ 7.2m, which is basically distributed in the range of IRI, IRI can be used to evaluate the smoothness of taxiway. However, the VACGA sensitive waveband is 6.4 ~ 23.6m when the taxiway speed is greater than 60km · h ~ (-1), and the distribution is not sensitive to IRI Band, indicating that when the aircraft glides over the runway at a high speed, the use of IRI to measure the flatness of the airport is not reasonable.