首页> 外文会议>21st conference on measurement of force, mass and torque together with HARDMEKO 2010 and 2nd meeting on vibration measurement >EXPERIMENTAL INVESTIGATION INTO THE EFFECTS OF EXCITER MOTIONS ON THE PRIMARY CALIBRATION OF SINGLE-ENDED ACCELEROMETER
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EXPERIMENTAL INVESTIGATION INTO THE EFFECTS OF EXCITER MOTIONS ON THE PRIMARY CALIBRATION OF SINGLE-ENDED ACCELEROMETER

机译:激励运动对单端加速度计主校准影响的实验研究

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It is widely known that in the primary calibration of accelerometers by using a laser interferometer, a unit under test (UUT) and the laser interferometer should measure vibration at the same position. However, this is not applicable to single-ended accelerometers because of the limitation of their design. One way of overcoming this limitation is to measure the vibration at several positions on the plate which connects UUT to a vibration exciter. However this can present the effects of rocking motions of the exciter. Although the motions of vibration exciters are presented in several studied, the different model of exciters might have different characteristics. This paper aims to study the motions of an air-bearing exciter (model 2911) used at National Institute of Metrology (Thailand) in order to expose their characteristics, their effects on the calibration results and the measurement errors due to these effects. The motions of the exciter are shown in terms of magnitude and phase shift distributions of sensitivities. These can be obtained by measuring the magnitudes and phase shifts at several positions on the plate. The effects of exciter motions are measured in terms of how much the magnitudes and phase shifts at each measured positions deviate from the average values. To illustrate these effects, parametric studies were conducted. The influences of four parameters, i.e. the angular positions of the laser points, the distance of the laser positions from the centre of the plate, the number of measured positions to be averaged and the mass loading effect, were examined experimentally. The frequency of interest is between 10 Hz and 15 kHz.
机译:众所周知,在通过使用激光干涉仪进行的加速度计的初步校准中,被测单元(UUT)和激光干涉仪应在同一位置测量振动。但是,由于其设计限制,因此不适用于单端加速度计。克服此限制的一种方法是测量将UUT连接到振动激励器的板上几个位置的振动。但是,这可能会出现激励器摇摆运动的影响。尽管对振动激励器的运动进行了一些研究,但不同的激励器模型可能具有不同的特性。本文旨在研究在国立计量学院(泰国)使用的空气轴承激励器(2911型)的运动,以揭示其特性,其对校准结果的影响以及由于这些影响而引起的测量误差。激励器的运动以灵敏度的大小和相移分布表示。这些可以通过测量板上几个位置的幅度和相移来获得。励磁机运动的影响是根据每个测量位置的幅度和相移偏离平均值多少来衡量的。为了说明这些影响,进行了参数研究。实验地检验了四个参数的影响,即激光点的角位置,激光位置距板中心的距离,要平均的测量位置数和质量加载效果。感兴趣的频率在10 Hz和15 kHz之间。

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