基于机桥耦合振动的滑行道桥优化设计研究
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V351.11

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中心工程开放基金


Research on Optimization Design of Taxiway Bridge Based on Aircraft-Bridge Coupling Vibration
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Central Engineering Open Fund

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    摘要:

    为优化滑行道桥的受力性能,对飞机-滑行道桥耦合振动响应规律进行了深入研究。通过建立滑行道桥简支梁和连续梁的理论方程,借助有限元软件Ansys对比分析了简支梁桥截面形式、跨度以及连续梁桥跨数、边跨比对机桥耦合振动的影响。研究结果表明,当简支梁桥的截面高度和跨度相同时,箱型梁桥的跨中最大挠度要显著小于T型梁桥,而基频均高于T型梁桥。滑行道桥的基频和跨度都会影响结构的振动响应,桥梁的跨中最大挠度随着跨度的增加,先减小后增大;当滑行道桥跨度较小时,由于其基频和飞机振动频率接近,跨中位移响应较大,随着跨度的增加,滑行道桥基频和飞机频率逐渐远离,跨中最大挠度逐渐减小,当跨度达到一定值时,跨中最大挠度再次增加。综合考虑基频和跨度的影响,对于A320飞机,17~20 m跨度的滑行道桥振动响应最小。对于连续梁桥,跨数和边跨比都对机桥耦合振动有一定的影响,随着跨数的增加,滑行道桥跨中最大挠度逐渐下降趋于平缓,对于跨度20 m左右的连续梁滑行道桥,四、五跨数是较好的桥梁形式,且最优边跨比分别为0.95和0.94。上述结论为滑行道桥结构的优化设计与诊断技术提供重要的参考依据。

    Abstract:

    In order to optimize the mechanical performance of the taxiway bridge, a further study on the coupled vibration response law of the aircraft and taxiway bridge was carried out. By establishing the theoretical equations of the taxiway bridge's simple beam and continuous beam, with the aid of the finite element software Ansys, the effects of the simple beam bridge's section form, span, continuous beam bridge span and side-span ratio on the aircraft-bridge coupling vibration were compared and analyzed. The research results show that when the cross-section height and span of the simply supported beam bridge keep the same, the maximum deflection in the middle of the box girder bridge is significantly smaller than that of the T-beam bridge, and the fundamental frequency is higher than that of the T-beam bridge. The fundamental frequency and span of the taxiway bridge will affect the vibration response of the structure. As the span increases, the maximum deflection of the bridge first decreases and then increases. When the span of the taxiway bridge is small, the mid-span displacement response is larger since its fundamental frequency is close to the vibration frequency of the aircraft. As the span increases, the fundamental frequency of the taxiway bridge gradually moves away from the aircraft frequency, and the maximum deflection in the mid-span gradually decreases. When the span reaches a certain value, the maximum deflection in the mid-span increases again. Considering the effects of fundamental frequency and span, for the A320 aircraft, the taxiway bridge with a span of 17 to 20 m has the smallest vibration response. For continuous beam bridges, as the number of spans increases, the maximum deflection of the taxiway bridge gradually decreases and tends to be stable. For continuous beam taxiway bridges with a span of about 20 m, four or five spans are good bridge forms. And the optimal side-span ratios are 0.95 and 0.94, respectively. The above conclusions provide significant reference for the optimization design and diagnosis technology of taxiway bridge structure.

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戚春香,丁丛丛,李佳坤. 基于机桥耦合振动的滑行道桥优化设计研究[J]. 科学技术与工程, 2022, 22(16): 6744-6751.
Qi Chunxiang, Ding Congcong, Li Jiakun. Research on Optimization Design of Taxiway Bridge Based on Aircraft-Bridge Coupling Vibration[J]. Science Technology and Engineering,2022,22(16):6744-6751.

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  • 收稿日期:2021-08-22
  • 最后修改日期:2022-03-04
  • 录用日期:2021-12-26
  • 在线发布日期: 2022-06-22
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