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wave-vibration
相关语句
  相似匹配句对
     r and the wave potential (?) .
     _r和波动势(?)
短句来源
     Wave propagation
     波的传播
短句来源
     We evaluated R-wave
     R波幅变化受到运动终止时心率影响。
短句来源
     MICRO-WAVE COOKING
     微波炉料理
短句来源
     Vibration and Wave Figure
     振动图像和波动图像
短句来源
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The IF and LF Laser vibration measurement instrument type GDZ-2 is used to measure the amplitude of a standard vibration table through interferometer and electronic technique. The wave length of a He-Ne laser is adopted to be the standard length for measuring. Then velocity and acceleration of the vibration table can be calculated by the amplitude and frequency measured. With the help of a special computer displacement, velocity and acceleration transducer may be calibrated. In order to attain the given precision,...

The IF and LF Laser vibration measurement instrument type GDZ-2 is used to measure the amplitude of a standard vibration table through interferometer and electronic technique. The wave length of a He-Ne laser is adopted to be the standard length for measuring. Then velocity and acceleration of the vibration table can be calculated by the amplitude and frequency measured. With the help of a special computer displacement, velocity and acceleration transducer may be calibrated. In order to attain the given precision, the interference fringes must be subdivided. If a trigonometric wave vibration is added to the reference mirror in the instrument, by using this method the sensitivity in measuring amplitude can be reached up to 0.003μ. Our paper describes the principles of the average method of phase modulation and multi-period, the principles of selection of data of the frequency and amplitude of trigonometric wave, and multi-period numbers, as well as their theoretical errors present.period

GDZ—2型激光测振仪应用氦—氖激光波长作为长度基准,通过干涉仪及电子技术,测量标准振动台振幅。由振幅及频率进而计算出振动台的速度和加速度,配合专用计算机,可标定位移,速度及加速度传感器。为达到指标要求,需将干涉条纹细分。本仪器采用调相多周期平均法,在测振仪参考(钅井)上附加三角波振动,使仪器所测的振幅灵敏度达到0.003μ。本文讨论了调相多周期平均法原理,三角波频率,幅度,多周期数等参数选定原则以及存在的理论误差。

The stator core resonance of hydro-electric generator caused by negative-phase-sequence current is a new problem encountered in recent years in this country, and to our knowledge, scarcely known abroad. In this paper, the formulas for natural frequency and amplitude of the core standing wave vibration are derived. A comparison of test data taken on a 60 MVA generator with calculation results shows that the natural frequencies obtained are close to those measured. Discrepancies are, however, found between the...

The stator core resonance of hydro-electric generator caused by negative-phase-sequence current is a new problem encountered in recent years in this country, and to our knowledge, scarcely known abroad. In this paper, the formulas for natural frequency and amplitude of the core standing wave vibration are derived. A comparison of test data taken on a 60 MVA generator with calculation results shows that the natural frequencies obtained are close to those measured. Discrepancies are, however, found between the calculated amplitudes and the measured ones, particularly at low I2%, yet at higher I2(74%), the discrepancies are shown to be within reasonable limits.

本文从理论上分析由负序电流引起的定子铁心振动.推导了固有频率和振幅的计算公式.文中介绍了水电站试验实测的部分结果,将计算值与实测值相比较,可见固有频率的计算值比较接近实测值,可作为设计电机的依据;振幅的计算值与实测值相差较大,但仍有一定的准确性,可供工程计算作参考.

This article presents two modified lead titanate piezoelectric ceramics. One is developed by adding Nd2O3, In2O3 and MnO2 to lead titanate and the other is modified by the alkali earth elements. Ca, Sr and Ba partially substituted for lead titanate and then the Pb(Co1/ 2W1/2)O3 added as solid solution. These materials both possess zero temperature coefficient of resonance frequency. The former is available for varions surface acoustic wave devices and bulk wave vibration mode devices. However the latter is mainly...

This article presents two modified lead titanate piezoelectric ceramics. One is developed by adding Nd2O3, In2O3 and MnO2 to lead titanate and the other is modified by the alkali earth elements. Ca, Sr and Ba partially substituted for lead titanate and then the Pb(Co1/ 2W1/2)O3 added as solid solution. These materials both possess zero temperature coefficient of resonance frequency. The former is available for varions surface acoustic wave devices and bulk wave vibration mode devices. However the latter is mainly useful for the electric scanning ultrasonic array probe. Both materials may be easily sitering and poling, and possess excellent piezoelectric, dielectric and elastic properties.

本文介绍了用Nd_2O_3、In_2O_3和MnO_2改性的PbTiO_3系压电陶瓷和用碱土金属元素部分取代pbTiO_3并通过固溶体Pb(Co_(1/2)W_(1/2))O_3改性的PbTiO_3系压电陶瓷材料的特性,这两种材料都具有谐振频率零温度系数,前者可用于声表面波器件和各种体波振动模式的器件,后者主要用于电子扫描超声波阵列探针。这两种材料都容易烧结、容易极化并且具有极好的压电、介电、弹性特性。

 
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