ロール補正装置を持つ振動発生機の試作

Abstract

This paper describes a vibration generator specifically developed for performing accurate crosstalk measurements of torsional vibration pickups. The vibration generator consists of a rectilinear vibration generator and a torsional vibration generator which functions as a roll correction device. Dynamic behaviour of the vibration generator is analysed, taking into account manufacturing inaccuracies of the elastic suspension of the rectilinear vibration generator. The theoretical analysis indicates that the parasitic rotation (roll) of the rectilinear vibration generator can be minimized by proper adjustments of the roll correction device. The validity of the theoretical analysis and the effectiveness of the roll correction device are verified by experiments. Experimental results are presented showing that after the adjustments the roll is reduced to less than ± 0.015 arcsec over a frequency range 5 Hz to 14 Hz for a constantacceleration harmonic excitation of ±0.1 g. It is pointed out that the correction device is equally effective when the vibration generator is driven statically. Detailed description of the design and construction of the vibration generator is given.