Because the structure vibrates at some modal, a vibration peak value will appear at its noise frequency spectrum.
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。
This paper introduces modal acoustic emission evaluation technique, including its fundamental principles, signal characteristic, noise rejection and source location etc.
本文介绍了模态声发射检测技术的基本原理、信号特征、噪声剔除和源定位等内容。
Finally, Based the analysis of theory modal, a modal testing program has been designed according to the existing test equipments, which prepares for the next testing of the vibration and noise.
在理论模态分析的基础上，根据现有的试验设备设计了合理的试验方案，为下步的振动与噪声的试验做了必要的理论准备。
The acoustic modal analysis of cavity is the important matter on vehicle NVH performance study. Identifying system mode is of importance to avoid acoustic resonance and reduce interior noise.
车室声学模态分析是汽车NVH特性研究的重要内容，识别系统模态对避免声学共振、降低车内噪声有重要意义。
A modal control method and controller design scheme for intelligent mechanically electrically acoustically coupled noise control system is proposed.
提出了机、电、声三相耦合的噪声智能控制系统的模态控制方法，给出了模态控制器的设计方案。
To predict the wheel's noise radiation, a FEM analysis model of the wheel is developed. Based on the modal superposition method, the radial receptance of the wheel is calculated.
为了预测车轮辐射的滚动噪声，本文建立了车轮有限元模型，对车轮进行了模态分析，并运用模态叠加方法计算了车轮的径向导纳。
Calculation of the stator modal frequencies of an electrical machine accurately is the base of reducing acoustic noise and vibration.
准确计算定子模态和固有频率是降低电机噪声和振动的基础。
Together with the FEM modal analysis of the car's roof panel and windscreen, an improved design is achieved to reduce the interior noise.
在结合声学试验分析和该车车顶棚、前风挡有限元模态分析的基础上，进行了针对降低车内噪声的改进设计。
Together with the FEM modal analysis of the car's roof panel and windscreen, an improved design is achieved to reduce the interior noise.
在结合声学试验分析和该车车顶棚、前风挡有限元模态分析的基础上，进行了针对降低车内噪声的改进设计。
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