查询词典 noise-power-ratio

Position parameters were obtained from the simulation with the model of towed array.Based on the theory of radiated noise forming, the launch noise was simulated according to test condition in Laboratory,and the result showed the launch impulsion noise obeyed SαS distribution. The simulated noise attenuating in deep sea was analyzed with a sound loss translation model.Minimum variance distortionless response,spatially smoothed MVDR, and beam-space multiple signal classification algorithm were adopted to process the signal, hence the source level, the frequency structure and the location of the launch noise were achieved.

基于试验的实际情况，根据潜艇拖曳阵模型，仿真生成了各水听器阵元与本艇的位置关系；根据噪声源理论模型分析产生雷弹发射模拟噪声，利用SαS分布模拟武器发射冲击噪声，仿真分析模拟噪声在海洋环境中的传播衰减，对阵元信号分别利用最小方差无畸变响应法（MVDR 、空间平滑MVDR以及适应子带的波束域多重信号分类算法进行信号处理，得到发射噪声的声源级、频谱结构和方位。

The factors that influence the noise performance of lithium-based grease were researched,the cleanliness of grease is merely one of essential conditions to decrease noise,the particle size of lithium soap thickener is smaller,the noise performance of grease is better,and the low viscosity naphthene base oil has good effect to decrease noise,the polymer can improve lubricity and decrease noise.

研究了影响锂基润滑脂噪音性能的各种因素，润滑脂的清洁度只是降低噪音的必要条件之一，锂皂稠化剂的微粒越小，润滑脂的噪音性能越好，低粘度的环烷基油具有良好的降低噪音的效果，高分子聚合物可以改善润滑性能，降低噪音。

NB/ANL button. Pressing this button enables the built in noise reducing functions. There are: noise blanker only, both noise blanker and automatic noise limiter, and automatic noise limiter only.

NB/ANL button ：静噪/噪音自动限制器按钮，按下这个按钮产生减少噪音功能：仅是噪音抑制器；既是噪音抑制器又是噪音自动限制器；和仅是噪音自动限制器。

Firstly the dissertation analyses the reason of vibration and noise of the transmission gear and the box, drawing a conclusion that the change of gear mesh rigidity and transmission error are the crucial causation to engender vibration and noise of the gear-box; the main source of the noise is the syntonic noise in box vibration and noise.

本文首先分别分析了变速箱传动齿轮和变速箱箱体的振动噪声产生机理，得知产生变速箱传动齿轮振动噪声的主要因素是轮齿啮合刚度的变化和传动误差的影响；且在变速箱箱体振动噪声中自鸣噪声是汽车变速箱的主要噪声源。

Due to the fact that the intercarrier spacing in OFDM is relatively small, OFDM transceivers are somewhat more sensitive to phase noise compared to single carrier transceivers. Thus this problem must be carefully considered in designing an OFDMbased system since an accurate prediction of the tolerable phase noise can allow designer to relax system specifications. According to spectrum theorem, two components of phase noise were analyzed: common phase error and intercarrier interference. On the basis of the analysis, the performance of OFDM was given for the case where phase noise has been added to the signal, and an optimal design criterion for OFDM parameters was proposed that allows to improve the phase noise error correcting capabilities in OFDM receiver.

由于采用子载波间相互正交的结构，OFDM系统对于由本地振荡器不稳定性所导致的相位噪声影响非常敏感，针对公共相位误差CPE和载波间干扰ICI两种影响表现形式不同的干扰项，从功率谱密度函数这一独特角度分析了相位噪声对OFDM系统性能的影响，提出了旨在提高接收机抵抗相位噪声能力的OFDM系统关键参数优化与设计准则，可在对所设计OFDM系统性能加以提高的同时，有效降低对接收机前端模拟振荡器件和相位噪声抑制单元的性能指标要求，从而降低接收机硬件实现成本。

Methods : The noise intensity and spect ral analysis were monitored with HS6288 noise inspector.Cumulative noise exposure was calculated according to noise intensity and working age. Testof Audio acuity was carried out for 931 noise exposure workers,who are with non - otopathy.

用HS6288 系列噪声分析仪监测作业场所噪声强度，并进行频谱分析，计算累积噪声暴露量；对某纺织厂接触噪声作业的无耳疾患的931人进行听力检测；用EpiData 建立数据库，SAS 软件8.0 统计包进行统计分析。

This method can make sure the structure radiant sound status in total noise and the detail phonate part quickly and correctly.(3) Study on the control mechanism of structure noise radiated from rotary machines, we build a common model of rotary machine structure noise analysis relied on the general characters of rotary machines. Based on this model, we analyzed various influence factors to structure radiant noise using the union of revolution and numerical calculation method. We found that the joint stiffness between the rotor and the frame is the most sensitive parameter of structure radiant noise by calculating and analyzing.

根据本文对于旋转机械结构噪声控制技术的研究结果和惯性振动筛工作的特殊要求，对有关参数的选择进行了讨论，并通过试验为降低惯性振动筛噪声找到了两个新的方法：即，在轴间相对运动要求不高的情况下，可以在激振器与筛体之间安装一组减振器，通过适当选取减振器参数，既可以使机体在工作频率附近获得稳定振幅，保证振动筛正常工作，又可以使机体的高频响应减小，降噪效果显著；反之，如果轴间相对运动精度要求(来源：1aABC论文网www.abclunwen.com)较高，可以采用空心滚动体轴承，在保证滚动体强度的条件下也可以获得较好的降噪效果。

This paper,through measuring and analyzing the noise sources in the hot-dip galvanization workshop of a steel tube plant,indicated that the operation of inner blowing tube is the major environmental source of noise pollution,studied the mechanism of air current noise for blow pipe,put forward comprehensive administer steps with sealing cap,pressure reduction,noise elimination and noise insulation.

噪声治理工程初步实施结果表明，内吹管噪声瞬时峰值降低了10~15dB，厂界噪声瞬时峰值降低了20dB以上，收到了良好的工程效果。

Content included: study on the relationship between noise and cumulative noise exposure as well as low frequency noise-induced hearing loss and high frequency noise-induced hearing loss; study on the relationship between noise sensitivity as well as LFNIHL and HFNIHL.1 Study on the relationship between noise and CNE as well as LFNIHL and HFNIHL657 data concerning workers' hearing check-up were collected including such types of work as Trial pilots and Riveters.

内容包括：噪声和累积噪声剂量与语频和高频听力损伤关系的研究；噪声敏感与语频和高频听力损伤关系的研究。 1 噪声和累积噪声剂量与语频和高频听力损伤关系的研究选取成都某大型飞机制造厂试飞和铆工两个工种作业人员657名作为研究对象。其中试飞员199人(均为男性；年龄23～60岁，平均37.36岁；接噪工龄1～42年，平均接噪工龄17.68年)。

Removing different kinds of impulsive noise in image is systematically researched, and proposes three image removing noise filter based on fuzzy information processing technique, i e., fuzzy entropy-based filter for removing noise in multilevel image, histogram-based filter for removing salt and pepper noise in image, and histogram- based adaptive filter for removing image impulsive noise.

该章对图像中不同类型加性脉冲噪声的去噪问题进行了系统地研究和分析，提出了三种基于模糊信息处理的图像平滑去噪滤波器，分别为基于模糊熵的多值图像去噪滤波器、基于直方图的图像椒盐噪声滤波器、基于直方图和区域信息的自适应图像脉冲噪声滤波器。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。