试验结果表明，风扇噪声主要是宽频带噪声，并得出了在不同频率范围风扇噪声对发动机噪声的影响。
From the result, we know the fan noise is mostly a width frequency noise, then obtain the effect of the fan noise on the engine noise in the different frequency range.
针对超声探伤的特点，设计了低噪声、宽频带、动态范围大的接收调理电路。
Aimed at the characteristics of ut, a receive and adjust circuit is designed, which have character of low noise, wideband, wide dynamic range of input.
提出了一种新型的宽频带共振吸声结构，该结构基于赫姆霍兹共振吸声机理，并充分利用了软管在长度上的优势，易于实现对低频噪声的控制。
Based on the sound absorption mechanism of Helmholtz Resonator, the advantage of soft tube length is fully used in the new structure, and thus the low-frequency noise can be controled easily.
本装置通过电池供电，采用低噪声、低功耗、宽频带、大动态范围设计，且具有实验过程中通过下传命令灵活改变实验装置参数功能。
The equipment is powered by battery, adopt low-power, low-noise, wide band and wide dynamic range designs. What's more, the system can change work parameters through down-transfers command.
系统达到了宽频带、低噪声、工作稳定的设计目标。
System reached a wide-band, low noise design goals of their work.
系统达到了宽频带、低噪声、工作稳定的设计目标。
System reached a wide-band, low noise design goals of their work.
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