摘要
研究飞机消除噪声的优化问题,针对飞机机体噪声对环境的污染,需要对飞机起落架(机体主要噪声源)的噪声特性进行测量分析,正确地认识起落架噪声的产生机理,为设计人员降低机体噪声提供数据和理论支持。为了将起落架噪声从飞机总体噪声中分离出来,研究平面阵的设计,提出了多臂螺旋阵的设计方案。对比了十字阵、均匀圆阵、多臂螺旋阵等的常规波束空间谱估计图,发现在传感器个数有限的条件下,多臂螺旋阵比十字阵和均匀圆阵能获得更小的主瓣宽度和更好的旁瓣抑制能力。根据对国产飞机ARJ21过顶飞行进行起落架噪声测量的要求,对多臂螺旋阵的起始半径、最大半径对主瓣宽度和旁瓣抑制水平的影响进行了仿真,找到了在传声器个数固定的情况下的最佳的多臂螺旋阵的设计方案。
In order to reduce the pollution of the airframe noise to the environment, it is necessary to measure and analyse the landing gear noise, which can help to understand the generating mechanism of the noise and provide data and theoretical support for the designer. So the planar array was designed for the landing gear noise measureing of civ- il airplane. Conventional beam-space spectrum estimation map of cross array, circular ,drray and multi-arm spiral ar- ray were compared, and conclusion was obtained that multi-arm spiral array has smaller mainlobe width and better sidelobe suppression ability under the conditions of limted number microphones. The influence of initial radius and maximum radius to mainlobe width and sidelobe suppression ability was simulated, and based on the demand of meas- uring of landing gear noise of ARJ21, optimal design of multi-arm spiral array was achieved through the simulation.
出处
《计算机仿真》
CSCD
北大核心
2011年第9期83-85,113,共4页
Computer Simulation
关键词
主瓣宽度
多臂螺旋阵
起落架噪声
Mainlobe
Multi-arm spiral array
Landing gear noise
