它缺乏重中低频，和中低频。
有源消声技术对于管道中低频噪声的控制非常有效。
The technique of active attenuation of noise is very effective for controlling the low frequency noise in ducts.
提出了一种通过测量动态应变实现工程中低频振动监测的方法。
A method based on dynamic strain signals for identifying damage of beam structures in time domain is presented.
这些地层的地震反射特征表现为大角度倾斜、可连续追踪和中低频的反射层序。
The Marine strata have the seismic characteristics of large dip, middle frequency, and moderate continuity.
低表面能涂层涂覆在铝合金模型上，考察了其在水筒中低频段降低流噪声的效果。
The flow noise reduction of al alloy model with low surface energy coatings have been studied in a water tunnel.
HRV频谱中低频和高频成分的比值（LF/HF）随着睡眠深度的变化而波动。
The ratio of the low frequency to high frequency components in HRV power spectrum(LF/HF) fluctuates with the change in the sleep stages.
目的了解中低频噪声接触对电力生产工人健康的影响，为采取切实有效的防范措施提供依据。
To learn the effect of middle and low frequency noise on the health of electricity producing workers, and to provide basis for finding effective preventive measures.
尤其对中低频和各种振动噪声均有良好的吸收效果，十分有利于减少噪音污染，改善工作环境。
Rock wool has good absorption function for medium and low frequency noise and various types of vibration noise. This will be very favorable for reducing noise and improving work environment.
计算结果正确预测出近场中低频段的指向性特点和远场声压级水平，与实测谱值有较好的一致性。
It has been verified that the directional characters in near sound field in low and middle frequency bands and the pressure level in far...
其结论对系统中低频振荡和次同步振荡的抑制提供了理论依据，对系统的安全稳定运行有参考价值。
The conclusion provides academic bases to restrain LFO and SSO and is significant to the security and stability of power system.
结果表明材料的平均吸声系数和降噪系数分别达0。58和0。60，且材料的中低频吸声性能优良。
The result shows that average absorption coefficient and noise reduction coefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.
结论中低频噪声接触导致作业工人听觉系统、神经系统、心血管系统、消化系统以及代谢功能的影响。
Middle and low frequency noise may affect workers' hearing system, nervous system, cardiovascular system, digestive system and metabolism.
时域有限差分法将声波基本方程表示为一个时间和空间的迭代方程组，实现对室内声场中低频段的模拟计算。
The acoustical wave equation is presented a serial spatial and time iterative equations and room acoustics field is simulated using finite difference time domain method.
介绍一套基于四电极测量原理的中低频液体阻抗测量系统，采用四电极的测量探头用于电导性液体中低频阻抗谱的测量。
An impedance spectroscopy measurement system for conductive aqueous solution at medium to low frequencies is designed using the four-electrode measurement theory.
通过分析和讨论阻塞形成、维持和衰亡过程中低频涡动和高频涡动的矢量型以及高频涡动对阻塞流型的强迫作用，得到了若干有意义的结果。
The vorticity flux divergence of the high frequency eddies in the maintenance of the blocking is also discussed. Some useful results are thus acquired.
通过分析和讨论阻塞形成、维持和衰亡过程中低频涡动和高频涡动的矢量型以及高频涡动对阻塞流型的强迫作用，得到了若干有意义的结果。
The vorticity flux divergence of the high frequency eddies in the maintenance of the blocking is also discussed. Some useful results are thus acquired.
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