Method and device for calculating noise in cabin of electric propeller aircraft

Abstract

The invention discloses a method and a device for calculating noise in a cabin of an electric propeller aircraft. According to the method, a cabin three-dimensional geometric model is established according to structural parameters of the electric propeller aircraft, grid division is carried out on the cabin three-dimensional geometric model, and grids are divided into structural grids, acoustic grids and acoustic envelope surface grids; propeller noise is equivalent to a fan sound source, corresponding material and physical property parameters are set as boundary conditions for calculating in-cabin noise, a sound-vibration coupling surface is established, data between a structural grid and an acoustic grid are mutually mapped, the in-cabin noise is calculated, field points are arranged in an aircraft in-cabin model, and the in-cabin noise is calculated. According to the method, the total sound pressure levels of the frequency doubling time field points of the propellers at different rotating speeds are calculated respectively, the sound pressure cloud atlas of the sound field in the cabin is obtained, the noise in the aircraft cabin can be calculated quickly, simply and conveniently, comparison and optimization of various noise reduction schemes are facilitated, the design period is greatly shortened, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of aviation technology, in particular to a method and device for calculating cabin noise of an electric propeller aircraft. Background technique [0002] Studies have found that severe cabin noise will not only cause the driver and passengers to experience rapid heartbeat, increased blood pressure, and inattention, but also reduce the sensitivity and stability of the instruments in the cabin, resulting in fatigue and service life of the aircraft structure. reduce. The noise in the electric propeller aircraft cabin is mainly composed of various sound sources and vibration sources. The noise in the cabin mainly comes from engine noise and turbulent boundary layer noise, so it is particularly important to study the noise characteristics in the electric propeller cabin. At present, the prediction of the cabin noise of electric propeller aircraft requires complex pre-test preparations. For the cabin, multiple microphones...

Images