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目前对文物保护的研究主要以试验为主,本研究试图用数值方法分析文物展柜的动力学特性,以解决试验分析方法所导致的缺陷。为此,对固定和浮放两种不同边界条件的文物展柜进行地震作用和简谐激励下的动力响应分析,给出了展柜展台面处的加速度动力放大系数(简称放大系数)上限值。以某博物馆展柜为原型,按1∶1/0.39进行缩尺振动试验,得出两种边界条件下展柜展台面处的放大系数。对试验展柜建立有限元模型,通过与试验对比,验证模型及分析方法的正确性。然后,建立展柜模型的有限元模型,对5种尺寸的展柜进行了动力响应分析,并考虑激励幅值、激励频率等对放大系数的影响。分析结果有助于指导文物的防震保护工作。
At present, the research on the protection of cultural relics is mainly based on experiments. This research attempts to analyze the dynamic characteristics of the antiquities showcase by numerical methods to solve the defects caused by the experimental analysis methods. Therefore, the seismic response and the dynamic response under the simple harmonic excitation of the cultural relics showcase with two different boundary conditions of fixed and floating are analyzed, and the upper limit value of the acceleration power amplification factor (abbreviated as magnification factor) at the exhibition counter is given. Taking a showcase of a museum as a prototype, a scale vibration test was carried out at a ratio of 1:1 / 0.39 to obtain the magnification factor at the exhibition booth surface under two kinds of boundary conditions. The finite element model of the test showcase is established, and the correctness of the model and the analysis method are verified by comparison with the test. Then, the finite element model of the showcase model was established. Dynamic response analysis was carried out on the 5 sizes of showcases, and the influence of excitation amplitude and excitation frequency on the amplification factor was considered. The results of the analysis help to guide the anti-seismic protection of cultural relics.