调节器输出的噪声频谱并不平滑。
探讨利用噪声频谱进行风机故障诊断的方法。
The method for fans fault diagnosis by using noise frequency spectrum was described.
声频谱包络的特点和音管的传递函数有相应的关系。
The envelope of sound spectrum is related to the transfer function of bore.
运用噪声频谱分析方法对铁合金企业噪声进行了分析。
This paper USES the method of noise spectrum analysis to analyze the enterprise noise of ferroalloys.
本文探讨了用齿轮噪声频谱分析来诊断齿轮磨损程度的方法。
This paper introduces the methods of diagnosing the tooth-wear through the spectrum analysis of gear noise.
第三章针对超声波检测信号特点，给出超声频谱分析的基本原理与方法。
Chapter 3 provides primary principles and approaches of ultrasonic spectrum analysis in accordance with features of ultrasonic testing signals.
这是因为结构以某一阶模态振动时，将在其辐射噪声频谱上出现一个峰值。
Because the structure vibrates at some modal, a vibration peak value will appear at its noise frequency spectrum.
探讨了小孔泄漏气体噪声频谱中某一频段声压级与雷诺数之间的函数关系。
The function relationship between acoustic intensity of eyelet leak noise frequency section and re was discussed.
利用超声频谱分析法对换能器进行频率特性分析，找出适合检测的最佳状态。
Spectrum feature analysis of the transducer apparatus is also conducted with this approach and thus achieves the best testing status.
针对某型柴油机排气噪声频谱特性，设计了一种新型阻抗复合式排气消声器。
The design process of a new type of exhaust silencer for some diesel engine models was discussed.
根据中频带通采样雷达噪声频谱在线监测方法，实现环境噪声和外部干扰频谱在线监测。
According to method inspecting on-line of noises spectrum in the IF-sampling radar. Realised that inspecting noises and interference of environment on-line.
第四章介绍了在自行构建的超声频谱分析系统上，进行超声频域特征应用方法与技术的研究。
Chapter 4 introduces the research of application and techniques of ultrasonic spectrum features on the analytic system which has been constructed.
本文通过对比试验分析了两种管长在不同转速下噪声频谱图，其共振转速与计算结果比较吻合。
The analysis of noise spectra of two exhaust pipes at different engine speeds is made. the resonance speed is obtained and agrees with the calculating value.
所以通过对冲击噪声频谱的研究，分析产生冲击噪声的瞬时时间与频谱之间的关系是十分必要的。
It is significant to study the spectrum of impact noise and the relation between spectrum of impact noise and transient time length.
为利用观察点处实测声频谱来预估实际声源自由场频谱特性，必须适当地计及地面反射和衰减效应的影响。
The ground reflection and attenuation must be properly accounted for in order to use the source spectrum measured at the site of the observer to predict the actual source spectrum in the free field.
利用超声频谱分析法成功地实现了缺陷的分类，试验结果表明，超声频谱分析技术可提高检测结果的可靠性。
Flaw classification is realized successfully through the ultrasonic spectrum analysis. The research proves that ultrasonic spectrum technology will promote the reliability of testing results.
研究了采用带通采样的方法，实现HF雷达噪声频谱在线监测的原理，以及频谱监测的波形设计和系统实现。
In this paper, an online inspecting scheme of noise is introduced by employing the band sampling method, and the design of wave shape and the implementation of HF radar system are presented.
随着孔隙率、孔径的减小，多孔铝的共振吸声系数有所下降，吸声频谱曲线向低频方向移动，且频带宽度展宽。
When the porosity and pore diameter reduced, the sound absorption curve moved to the low frequency zone and the frequency bandwidth increased at the same time.
通过理论计算和分析确定了噪声频谱图中各噪声峰值对应的噪声源及其传递路径，指明了压缩机降噪的主要目标。
Through theory computation and analysis, the source of noise and transfer paths corresponding to every noise peak value are confirmed, the main aim to decreasing noise is pointed out.
该文研究了在获得噪声频谱基础上，使用非线性优化方法获取雷达优质工作频率或频段，实现高频雷达工作频率在线实时优化选择。
In this paper, researched into the method of nonlinear optimization for obtained optimal HF radar work frequency, finished to optimize HF radar work frequency on-line real-time.
文章主要介绍DSP的芯片结构和性能、ADSP-2101在声频谱仪器控制系统中的功能及实现、声频谱仪器现场采集的接收全波列波形和结论。
The paper is mainly deals with the structure and function of DSP chip, function of ADSP-2101 performed in control system of Audio-frequency spectral, received wave form of full wave …
内插管结构能改善消声器的声学性能，拓宽消声频率范围，但设计它的具体长度需要根据排气频谱来选择。
Intubation structure can improve the acoustic performance of mufflers and widen the frequency range of mufflers, but its length must be designed according to the exhaust spectrum.
内插管结构能改善消声器的声学性能，拓宽消声频率范围，但设计它的具体长度需要根据排气频谱来选择。
Intubation structure can improve the acoustic performance of mufflers and widen the frequency range of mufflers, but its length must be designed according to the exhaust spectrum.
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