aerodynamic noise

Mechanism of centrifugal blower creating aerodynamic noise is analyzed, and the methods for noise reduction by optimizing structure parameters such as volute throat gap, volute throat radial and relative width of swirl regions in exit blade channel are put forward.

分析了通风机空气动力噪声产生的机理，提出通过优化风机的蜗舌间隙、蜗舌半径以及叶道出口涡流区相对宽度等关键结构参数降低噪声的方法。

Chaos characteristics of the aerodynamic noise are discussed and the aeroacoustic noise signals on helicopter scissors tail rotor is analyzed by the chaos theory.

直升机尾桨/尾梁耦合稳定性分析研究研究剪刀式尾桨气动噪声的混沌特性，并应用混沌理论进行了直升机尾桨气动噪声信号分析。

The main source of noise is aerodynamic noise which may be divided into three major parts: noise from vortex flow around the train, noise from boundary layer and noise from wake.

主要噪声来源为空气动力性噪声.它可分为3个部分：绕流声、附面层噪声与尾流噪声。

A Study on the Low Aerodynamic Noise Performance Analysis and Control of Engine Cooling Axial Flow Fan

发动机轴流冷却风扇低噪声气动性能分析与控制研究

It is very important to reduce the aerodynamic drag and noise for a transport vehicle.

减小汽车行驶中的空气阻力,抑制行驶时的气动噪声具有十分重要的意义.

half ellipse head and tine end of the turning vane cause the lower pressure loss and aerodynamic noise than the hemicycle end.

半椭圆形头部和尖形尾部导流片有较低的压力损失和气动噪声，避免采用半圆形尾部形状；

Industrial-process control valves-Part 8-3 : noise considerations-Control valves aerodynamic noise prediction method.

工业过程控制阀.第8部分:噪声问题.第3节: 气动控制阀噪声预测法.

Taking the target ′ s maneuvering acceleration, target ′ s maneuvering time and target ′ s glint noise into account, the switching time from aerodynamic control to compound control is decided.

在考虑目标机动加速度大小、目标机动时刻以及目标角闪烁的条件下，确定了拦截弹的控制方式由空气动力切换到复合控制时的切换时间。

The key point of reducing noise paper machine is to reduce aerodynamic noise of vacuum couch.

降低真空伏辊空气动力性噪声是降低抄纸机噪声的关键.

Aerodynamic resistance is proportional to the second-order of speed, and aerodynamic noise increases quickly along with the seventh-order or eighth-order of speed.

气动阻力与速度的二次方成正比，气动噪音随速度七次或八次方而急增。

When the LES is used to compute the exterior aerodynamic noise of automobile, because there is complex separated and reattached flow on the surface of car body, the simple wall function can not meet the requirement of the realistic situation.

采用大涡模拟对汽车外部气动噪声计算时，由于车身表面复杂的分离流与再附着流，采用简单的壁面模型已经不能满足实际计算的要求。

In this paper, the integral formulations for the calculation of the aerodynamic noise around high speed vehicles is abstained through the solution of generalized Lighthill's equation.

通过求解广义Lighthill方程，得到了适合车辆行驶工况的气流噪声积分计算公式。

By modifying the thickness of the blade trailing edge, research influences of the blade trailing edge to the aerodynamic performance and noise levels.

通过修改叶型尾缘厚度，研究叶型尾缘厚度对风洞风扇的气动性能和噪声水平的影响。

Described are the sound source detection method for the aerodynamic noise on Shinkansen rolling stock and relevant noise reduction measures.

介绍了新干线车辆空气动力噪声的声源探测方法及相应的降噪措施。

Noise is included aerodynamic noise and structure noise.

噪声主要包括气动噪声和结构噪声.

The Theoretical Research and Numerical Simulation of Aerodynamic Noise for High-Speed Train

高速列车气动噪声的理论研究与数值模拟

since the cross-flow fan's geometry and flow structures are complex, the aerodynamic noise forecast model is still a pending problem.

由于风机几何结构和流动结构的复杂性，其气动噪声的预测模型还是一个有待研究解决的问题。

Study on the aerodynamic noise of a fastback car with rear view mirrors in uniform motion and accelerated motion

匀速及加速行驶时带后视镜轿车气动噪声的研究