基于地震反应谱的候风地动仪设计理论

DESIGN THEORY OF HOUFENG SEISMOGRAPH BASED ON SEISMIC RESPONSE SPECTRUM

东汉科学家张衡所发明的候风地动仪在失传后至今还未得到公认的复原模型,致使其真实性受到外界的质疑。针对候风地动仪复原研究中存在的对于候风地动仪实际性能不明确及缺乏有效的性能检验方法两大问题,在对地动仪测震机理、候风地动仪的示震性能和抗干扰性能进行分析的基础上,提出了将地动仪对检验波是否做出示震响应作为候风地动仪示震灵敏度与抗干扰性能检验标准的检验波法。在确定了应响应检验波与不响应检验波两种检验波的基础上,提出了一种全新的基于反应谱的候风地动仪复原方案,推导出候风地动仪自振周期范围为1.5 s~2.5 s,响应临界值为5 mm~10 mm。研制了实验样机,试验表明该复原模型满足候风地动仪的示震与抗干扰要求,证实了候风地动仪历史记载的真实性。

The authenticity of the Houfeng seismograph, invented by the great scientist of the Eastern Han Dynasty, Zhang Heng, has been questioned by the outside world, because it has not yet been restored to a recognized model after being lost. The first major problem in the research on the restoration of the Houfeng seismograph is that the actual performance of the Houfeng seismograph is not clear, another major problem is the lack of effective performance inspection methods. In view of the two major problems, and based on the seismic mechanism analysis of the seismograph, the seismic performance and the anti-interference performance of the Houfeng seismograph, a test wave method is proposed, which takes the seismic sensitivity and anti-interference performance of the Houfeng seismograph as the criteria for testing whether the Houfeng seismograph responds to the test wave or not. Based on the determination of two kinds of test waves, namely the responsive test-wave and the unresponsive test-wave, a new restoration scheme of the Houfeng seismograph based on the response spectrum is proposed, and the natural vibration period(1.5 s~2.5 s) and response critical value(5 mm~10 mm) of the Houfeng seismograph are derived. An experimental prototype was developed, and the test showed that the restoration model meets the seismic display and anti-interference requirements of the Houfeng seismograph, and confirms the historical records authenticity of the Houfeng seismograph.