查询词典 international pitch

Headroom in the central aisle was barely six feet (1.8 m) and the seat pitch was 38-inch (970 mm), giving only 6 or 7 inches (180 mm) more legroom than in an international coach class cabin.

中央通道静高只有6英尺（1.8米），座位间距38英寸（970毫米），相对于国际航班的二等舱，也只多预留了6—7英寸（180毫米）的腿部空间。

In 1939, an international conference recommended that the A above middle C be tuned to 440 Hz, now known as concert pitch .

历史上一些遗留下的管乐器，主要是管风琴带着他们的音高直到现在，我们看看

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

Stadium with the football pitch in line with international standards, the eight formal athletic field, 400 meters, can accommodate more than 12,000 spectators things stand, advanced electronic displays in mind when Points, meeting rooms, a VIP reception, contests studio, the news studio, clinic, athlete lounge and the referee breaks, and so on, is a comprehensive multi-functional stadium.

运动场设有符合国际标准的足球场、正规的八道次400米田径场，可容纳观众12000多人的东西看台，先进的电子记时记分显示屏，会议室、贵宾接待室、竞赛工作室、新闻工作室、医务室、运动员休息室和裁判员休息等，是一个多功能综合运动场。

In the latest sign of China's rising upper crust and its growing appeal to international marketers, Robb Report, a self-declared catalog of the best of the best for the richest of the rich, is making its pitch here with a Chinese-language edition.

中国的富人群体正在崛起，对国际品牌的吸引力也日益增强。最近自称是面向巨富的极品杂志进驻中国，推出了自己的中文版。

States under the Sky Fling international co., Ltd., is a professional manufactory of car care products, we offer many kinds of car care products, including the auto under coating, glare professional polish, chipping rubber, engine surface degreaser, oil treatment, super oil treatment, pitch cleaner, 3 minutes motor flush, de-rust lubricating spray, car refrigerant, panel cleaner, multi-purpose foam cleaner, tyre foam cleaner, carburetor cleaner, glass cement, multi-purpose seal gum, seal gum for the sheet matel, radiator flusher, antifreeze, windshield cleaner, leather vinyl rubber protectant, Deluxe hard wax, Deluxe colour back wax and so on.

佛山市天翼发展有限公司隶属天翼国际有限公司，是专业生产销售汽车养护用品的企业，主要产品：底盘装甲、釉、粒粒胶、发动机外部清洁剂、发动机强力修复剂、超级机油精、柏油清洁剂、3分钟引擎洁霸、多功能锈蚀松动剂、汽车专用致冷剂SFA、表板蜡、多功能泡沫清洁剂、轮胎泡沫光亮剂、化油器清洁剂、玻璃胶、多功能密封胶、钣金专用密封胶、水箱清洁剂、防冻剂、雨刮精、高级固蜡、高级砂蜡等。

States under the Sky Fling international co., Ltd., is a professional manufactory of car care products, we offer many kinds of car care products, including the auto under coating, glare professional polish, chipping rubber, engine surface degreaser, oil treatment, super oil treatment, pitch cleaner, 3 minutes motor flush, de-rust lubricating spray, car refrigerant, panel cleaner, multi-purpose foam cleaner, tyre foam cleaner, carburetor cleaner, glass cement, multi-purpose seal gum, seal gum for the sheet matel, radiator flusher, antifreeze, windshield cleaner, leather vinyl rubber protectant, Deluxe hard wax, Deluxe colour back wax and so on.

隶属天翼国际，是专业生产销售汽车养护用品的企业，主要产品：底盘装甲、釉、粒粒胶、发动机外部清洁剂、发动机强力修复剂、超级机油精、柏油清洁剂、3分钟引擎洁霸、多功能锈蚀松动剂、汽车专用致冷剂SFA、表板蜡、多功能泡沫清洁剂、轮胎泡沫光亮剂、化油器清洁剂、玻璃胶、多功能密封胶、钣金专用密封胶、水箱清洁剂、防冻剂、雨刮精、高级固蜡、高级砂蜡等。

States under the Sky Fling international co., Ltd., is a professional manufactory of car care products, we offer many kinds of car care products, including the auto under coating, glare professional polish, chipping rubber, engine surface degreaser, oil treatment, super oil treatment, pitch cleaner, 3 minutes motor flush, de-rust lubricating spray, car refrigerant, panel cleaner, multi-purpose foam cleaner, tyre foam cleaner, carburetor cleaner, glass cement, multi-purpose seal gum, seal gum for the sheet matel, radiator flusher, antifreeze, windshield cleaner, leather vinyl rubber protectant, Deluxe hard wax, Deluxe colour back wax and so on.

佛山市天翼发展有限公司有限公司隶属天翼国际，是专业生产销售汽车养护用品的企业，主要产品：底盘装甲、釉、粒粒胶、发动机外部清洁剂、发动机强力修复剂、超级机油精、柏油清洁剂、3分钟引擎洁霸、多功能锈蚀松动剂、汽车专用致冷剂SFA、表板蜡、多功能泡沫清洁剂、轮胎泡沫光亮剂、化油器清洁剂、玻璃胶、多功能密封胶、钣金专用密封胶、水箱清洁剂、防冻剂、雨刮精、高级固蜡、高级砂蜡等。

The test for the likely attacking lineup for the international team's last qualifier for the World Cup was carried out during an eight against nine practice match on the half pitch with rotating goalies.

在半个场地用这个组合进行了8人打9人，守门员轮换守门的训练。这个尝试很可能就是明天国家队在预选赛上最后一战的首发阵容。

Pitch frequency by the sound level of the object decision, high frequency sound on the high, low frequency sound is low, the existing international standard pitch was in May 1939 in London by the International Standards Association of a1 = 440 Hz.

音高是由发音物体振动频率的高低决定的，频率高声音就高，频率低声音就低，现行的国际标准音高为1939年5月国际标准协会在伦敦通过的a1＝440赫兹。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。