声强级

结果测量发现聚苯乙烯造粒机、聚乙烯造粒机、休息室。控制室的A计权网络的等效声级均未超过有关的标准，而频谱分析则发现其主要的声强级均分布在200Hz以下。

Results The leq ( A ) did not exceed about criterion in polystyrene machine , rest room , control room , whereas most sound levels were distributed below 200 Hz by frequency analysis .

炉内背景噪声的声强级和频域分布特点。

The specialties of sonic intensity level of background noise and distributing in frequency .

还有一些可以直接测出声强级的仪器，叫做噪声计。

There are also instruments known as noise meters which measure this level directly .

泄漏噪声声强级与锅炉容量的关系；泄漏噪声声强级与泄漏孔径的关系；

The relationship between the level of the intensity of the leak noise and the capability of boiler ;

主要实验内容为：泄漏噪声声强级与泄漏蒸汽压力之间关系；

The main experiments : the relationship between the sonic intensity and the pressure of the steam that leak out of the boiler ;

排气噪声、发动机散热风扇噪声及发动机机罩振动噪声为拖拉机主要噪声源，声强级分别为106dB、104dB、104dB；

The exhaust noise , the engine ventilator noise and the noise of vibrating cover of the engine are the main noise source of the tractor , and the levels of sound intensity are 106 dB , 104 dB , and 104 dB respectively .

实验结果表明，白噪声比短声（信号）的声强级低30dB（SL）以上时，ECochG和ABR的振幅仅轻微减小。

When white noise was more than 30 dB SL below click intensity , the amplitudes of ABR and ECochG were decreased slightly .

虚拟式声强分析仪以傅里叶变换为基础，利用软件和硬件相结合的方法实现了对总声强级及其相应倍频程的实时测量和分析。

As an application , combining software and hardware , all kinds of weight noise sound level measurement and real-time noise octave analyzes realized synchronously .