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1.前言最近认识到防震设计的重要性,随着防震模拟器需要的增加,所要求的性能、规格亦逐渐提高了。特别是其中由于地震波用加速度记录的较多,所以在防震试验中加速度波的再现亦成为重要的课题。关于位移控制,己有很多地震模拟器供给实用方面。可是,通常由于加速波形中的高次谐波的失真难于在位移波形中显现出来,所以,即使做为位移控制来说是优越的,但往往加速度波形的失真较大。而且,防震试验的方法也由用正弦波的试验到进行用任意波或实际地震波的试验,而且,由于加速度波的再现,加速度波形的失真却成为问题。在这种情况下,本文在明确加速度控制的控制方面的问题的同时,对于加速度控制的具体方法及把它适用于实际地震模拟器的结果作一叙述。
1. INTRODUCTION Recently, the importance of earthquake-resistant design has been recognized. As the requirements of earthquake-resistant simulators increase, the required performance and specifications have gradually increased. In particular, since seismic waves are frequently recorded with accelerations, the reproduction of acceleration waves has also become an important issue in earthquake proofing tests. With regard to displacement control, many seismic simulators have been provided for practical aspects. However, since distortions of higher harmonics in the acceleration waveform are often difficult to visualize in the displacement waveform, the distortion of the acceleration waveform tends to be large even though it is superior as a displacement control. Moreover, the method of the earthquake proofing test is also experimentally performed with a sine wave or an arbitrary wave or actual seismic wave, and the distortion of the acceleration waveform becomes a problem due to the reproduction of the acceleration wave. In this case, this paper clarifies the control of acceleration control, and at the same time, it gives a detailed account of the specific method of acceleration control and its application to the actual earthquake simulator.