acoustic and noise

Random pulse width modulation (RPWM) can make the harmonic spectrum of inverter output voltage be continuously distributed without affecting the fundamental frequency component, and thus the acoustic noise and mechanical vibration of an inverter-fed AC mot or drive are greatly reduced.

应用随机脉宽调制(pulse width modulation,PWM)方法可以使逆变器的输出电压频谱呈连续分布而不影响基波分量,这样由逆变器供电的电动机的声学噪声和机械振动就会大大减小。

Acoustics--Determination of sound power levels of noise sources--Precision methods for anechoic and semi-anechoic rooms

GB/T6882-1986声学噪声源声功率级的测定消声室和半消声室精密法

Acoustics--Determination of sound power levels of noise sources--Requirements for the performance and calibration of reference sound source

GB/T4129-1995声学噪声源声功率级的测定--标准声源的性能要求与校准

Acoustics - Determination of occupational noise exposure and estimation of noise-induced hearing impairment???

声学－－职业性噪声暴露测定和噪声听力损伤估算

internal-noise bandwidth

内噪声[固有噪声]带宽

Johnson noise

【无】热(激)噪声

Acoustics--Noise labeling of machinery and equipment

GB/T14574-1993声学机器和设备的噪声标牌

equal listener response scale

等听者响应标度 -声学中噪声标度

Acoustics-Measurement of noise emitted by passenger cars under conditions representative of urban driving.

声学市区行驶条件下轿车噪声的测量.

The measurement of distribution of extericr wind noise of automobile by acoustic mirror

声学聚焦镜测量汽车车外风噪声分布

Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using a reference sound source

GB/T16538-1996声学声压法测定噪声源声功率级使用标准声源简易法

Acoustics--Guidelines for the design of low-noise workplaces--Noise control strategies

GB/T17249.1-1998声学低噪声工作场所设计指南噪声控制规划

Interior noise evaluation and noise source identification of a fuel cell vehicle based on psychoacoustic parameters

基于心理声学参数的燃料电池轿车车内噪声评价及噪声源识别

Acoustics--Determination of sound power levels of noise sources using sound intensity--Part 2: Measurement by scanning

GB/T16404.2-1999声学声强法测定噪声源的声功率级第2部分：扫描测量

Acoustics--Measurement of noise emitted by stationary road vehicles

GB/T14365-1993声学机动车辆定置噪声测量方法

Acoustics--Measurement of noise emitted by passenger cars under conditions representative of urban driving

GB/T17250-1998声学市区行驶条件下轿车噪声的测量

Acoustics--Measurement of noise emitted by rail bound vehicles

GB/T5111-1995声学铁路机车车辆辐射噪声测量

Acoustic similarity is the base of scaled model tests of underwater structure noise.

声学相似性是水下结构噪声模型试验的基础。

Wavelet-based Method for Speckle Reduction in Medical Ultrasound Image;

基于小波的医学超声图像去斑点噪声方法