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本文从线性振动理论的角度,研究了非理想的地震检波器在实际使用的水平振动台上测得的准稳态伪信号响应曲线的状态,从而较好地解释了这些曲线具有多样性、方向性、重复性差等现象的原因,提出了合理要求振动台及测试条件的必要性,探讨了影响假频的诸因素,阐明了假频产生的原因及其提高假频的途径,并在此基础上,经过大量实验,将SDJ-78型地震检波器的质量提高到国际同类产品的前列。本文的研究方法亦可供其他弹簧悬挂刚体的振动、隔振等问题参考。
In this paper, from the perspective of linear vibration theory, the quasi-steady-state pseudo-signal response curves of non-ideal geophones measured on the actual horizontal shaking table are studied, which can well explain the diversity of these curves, The reasons for the phenomenon of poor repeatability and poor repeatability, the necessity of reasonable requirements of the shaking table and the testing conditions is put forward, the factors affecting the aliasing are discussed, the reasons for the aliasing and the ways of improving the aliasing are clarified After a large number of experiments, the quality of the SDJ-78 geophone was upgraded to the forefront of similar international products. The research method of this article can also be used for other spring suspension rigid body vibration, vibration and other issues for reference.