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Test and analysis of window vibration for anti-laser-eavesdropping
Applied Acoustics ( IF 3.4 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.apacoust.2020.107871
Yi Zeng , Peng Pan , Yingri Cao , Huahao Ai

Windows are obvious targets for laser eavesdropping and can be easily eavesdropped. However, studies on the window vibration characteristics and associated anti-laser-eavesdropping measures are relatively scarce. To reduce the window vibration and decrease the eavesdropping risk, this study investigates the influence of the glass thickness, glass size, and number of window layers on glass vibration by carrying out theoretical analysis, full-scale testing, and finite element analysis. To begin, the effect of the window size and thickness on voice-induced vibration is investigated using elastic thin plate theory. It is found that the vibration is relatively low if the window’s natural frequency exceeded 500 Hz. Then, a full scale test is conducted to investigate the effect exerted by the number of window layers, and it is found that the glass vibration in the double-pane (Insulated Glass Unit) window is 74% less than that in the single-pane window. To further investigate the multi-layer window characteristics, a refined finite element model that considers acoustic-structural coupling is established in ABAQUS and validated by the test results. The analysis results reveal that only 1% of the glass vibration is transmitted by the window frames, and the two glasses in the Insulated Glass Unit(IGU) have similar vibration magnitude and characteristics when the total glass thickness is the same. Additionally, when the windows have the same glass thickness, the vibration of the IGU is 55% less than that of the single-pane window, and 40% less than that of the triple pane window. Hence, when the size and glass thickness are the same, IGU windows are the best option for reducing the glass vibration and prevent laser eavesdropping.



中文翻译:

防激光窃听的车窗振动测试与分析

窗户是明显的激光窃听目标,很容易被窃听。然而,关于车窗振动特性和相关的防激光窃听措施的研究相对较少。为了减少窗户振动并降低窃听风险,本研究通过进行理论分析,全面测试和有限元分析,研究了玻璃厚度,玻璃尺寸和窗户层数对玻璃振动的影响。首先,使用弹性薄板理论研究了窗口大小和厚度对声音引起的振动的影响。发现如果窗户的固有频率超过500 Hz,则振动相对较低。然后,进行全面测试以调查窗层数所产生的影响,并且发现双窗格(隔热玻璃单元)窗口的玻璃振动比单窗格窗口的玻璃振动小74%。为了进一步研究多层窗的特性,在ABAQUS中建立了一个考虑声-结构耦合的改进的有限元模型,并通过测试结果进行了验证。分析结果表明,窗框只传递了1%的玻璃振动,并且当总玻璃厚度相同时,中空玻璃单元(IGU)中的两块玻璃具有相似的振动幅度和特性。此外,当窗户的玻璃厚度相同时,IGU的振动比单窗格窗户小55%,比三窗格窗户小40%。因此,当尺寸和玻璃厚度相同时,

更新日期:2021-01-10
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