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Prediction of Flight Noise Level by Using Far Field Noise Data of the Eengine in Static Testing

LIU Jin-hu;YAN Guo-hua;XIE Fu

2012, 32 (2): 91-94. DOI: 103969/j.issn.1006-1355-2012.02.022

Abstract （1081）

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（ Aviation Engineering College of Civil Aviation University of China, Tianjin 300300， China ）
Abstract : Before an aircraft with the advanced engine putting into the market, its airworthiness noise recertification is necessary. Using the static test data of the engine to predict the flight noise level of the aircraft can reduce the cost of the recertification. In this article, the far field noise data of the testing engine was modified according to the flight condition and then used to predict the flight noise level of the aircraft. The feasibility of this method was verified by comparing the results with those in the real flight test.

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《Analyses of Dynamic Responses of Subway Tunnels with Different Sections under Vibration Loading》

LIU Jin;CHEN Chang-zheng;ZHAO Hui

2009, 29 (5): 38-42. DOI: 10.3969/j.issn.1006-1355.2009.05.01

Abstract （2432）

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Strength and deformation of soil around the subway tunnel is greatly affected by the vibration induced by the subway trains. In this paper, taking Beijing subway line 5 as an example, the dynamic responses of subway tunnels with rectangular and circular sections under train’s vibration loading are computed by means of the finite element code. The deformation of soil around the subway tunnels and the displacements of the ground surface are also given. The computation results for the two sections are analyzed and compared mutually. These results may provide some reference data for subway tunnel design。