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飞机的爬升梯度反映了飞机超越地面障碍达到安全高度的能力,为保障民机复飞时的飞行安全,适航条款规定复飞爬升梯度应满足一定的数值要求。根据适航条款对民机复飞程序和复飞爬升梯度的规定,提出了一种基于数字虚拟飞行的复飞爬升梯度适航符合性评估方法。基于适航条款规定和驾驶员操纵特点,建立了复飞任务的数字化模型和驾驶员操纵模型,进而以国内某型涡喷支线客机为对象建立飞行动力学模型,构成了可进行复飞爬升任务仿真的数字虚拟飞行仿真系统。通过仿真计算完成了对着陆爬升和进场爬升的爬升梯度评估,并与真实试飞结果对比,评估误差在10%以内,验证了该方法的适用性和准确性。该方法可应用于民机的概念方案设计,为保证飞机复飞爬升性能的适航符合性和最大着陆重量的确定等提供支持。
The climb gradient reflects the ability of the aircraft to reach a safe altitude beyond the ground obstacle. In order to ensure flight safety during the go-around of the civil aircraft, the airworthiness provisions stipulate that the go-around climb gradient should meet certain numerical requirements. According to the provisions of airworthiness clause on the Go-Go program and go-around climb gradient, a method based on digital virtual flight to go-around gradient suitability assessment is proposed. Based on the regulation of airworthiness and the characteristics of driver’s manipulation, a digital model of go-around task and a driver’s manipulation model are established, and then a flight dynamics model is set up for a domestic jet-jet regional airliner, Simulation of digital virtual flight simulation system. Through the simulation calculation, the climb gradient assessment of landing climb and approach climb is completed. Compared with the real flight test results, the evaluation error is within 10%, which verifies the applicability and accuracy of the method. The method can be applied to the conceptual design of civil aircraft and provide support for ensuring airworthiness compliance and determining the maximum landing weight of go-around performance of the aircraft.