驾驶舱空气动力源致振动响应分析研究

目的分析驾驶舱外形上多处凸起对驾驶舱内若干重要部位的振动响应的影响。方法首先采用大涡模拟方法,计算多种飞行工况下分离气流产生的作用于机身前段外表面的非定常脉动压力载荷,然后将所得载荷作用于前机身详细有限元模型上,获得所关心的驾驶舱内部分站位的加速度响应。结果通过对加速度响应结果的分析处理及与试飞测试数据对比,可知驾驶舱外形上多处凸起对驾驶舱内的振动量值影响比较大,气流分离对驾驶舱舱内振动贡献,峰值位置处达到了25%左右。结论相关计算结果可用于驾驶舱工效性评估和驾驶舱外形优化。

Vibration Responses of the Cockpit Caused by Aerodynamic Sources

The paper aims to analyze the influence on the vibrating responses of some interested parts inside the cockpit, which is caused by the bumps on the outer surface of the cockpit. The pulsating pressures on the outer surface of front fuselage under some specific working conditions were calculated firstly through large eddy simulation methodology. Then the pulsating pressures was applied to the detailed finite element model of the front fuselage and the responses of acceleration of some stations in the cockpit were obtained. After analysis of the acceleration response result and comparison of the test flight data, it was confirmed that the bumps on the outer surface of the cockpit contributed a lot to the magnitude of vibration inside the cockpit. The contribution of flow separation could reach 25 percent at the peak position. Relevant calculation results could be used to evaluate the man-machine efficacy and optimize the external form of the cockpit.