ヨー補正装置をもつ振動台の試作

概要

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This paper describes a rectilinear vibration table specifically developed for performing accurate crosstalk calibration of torsional vibration pickups. It is suspended by parallel flat-springs, and it incorporates a yaw correction device in onder to minimize the parasitic rotation. The correction device is composed of two identical electrodynamic driving units, which are disposed off-centre so as to generate an adjustable torque in addition to the main thrust. Dynamic behaviour of the moving table is analysed, taking into account manufacturing inaccuracies of the suspension. The theoretical analysis indicates that the parasitic rotation can be minimized over a wide frequency range by proper adjustment of the correction device. The validity of the theoretical analysis and effectiveness of the correction device are verified by experiments. Experimental results are presented showing that after the adjustment the parasitic rotation is reduced to less than ±0.05 arcsec over the frequency range 5 Hz to 48 Hz for a constant-acceleration harmonic excitation of ±0.1g. It is pointed out that the correction device is also applicable to statically-driven moving tables. Detailed description of the design and construction of the vibration table is given.
公益社団法人精密工学会の論文
1985-03-05