With the measurement of average sound pressure level and sound power level, the noise reduction result of the oil pan made by sandwich steel plate was proved.
通过平均声压级和声功率级的测试验证了复合钢板试制的油底壳的降噪效果。
This algorithm can overcome the deficiency of the conventional algorithms of noise reduction, which were only efficient for stationary environments and have large level of signal residual noise.
对此，本文研究了一种非平稳环境下基于小波变换的信号去噪算法。
Their designs ensure operator safety as well as offering the highest level of noise reduction possible, easy access fro maintenance, all the while being efficient and cost effective.
公司设计的产品能够确保操作员的安全，而且还提供最高级别的降噪性能，方便维修，最重要的是效率高且成本低。
Tip load reduction prop fan blade design would be benefit to lowering the noise level as well as to the prop fan efficiency improvement.
桨扇叶尖区采用卸荷设计有利于降噪及提高效率。
Tip load reduction prop fan blade design would be benefit to lowering the noise level as well as to the prop fan efficiency improvement.
桨扇叶尖区采用卸荷设计有利于降噪及提高效率。
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