Vibration Characteristic Analysis and Experiment of Non-Rigid Airship with Suspended Curtain

doi:10.1007/s12204-015-1620-0

摘要/Abstract

摘要： In order to evaluate the vibration characteristics of non-rigid airship with suspended curtain, we introduce vibration characteristic analysis method of the inflatable membrane structure. Modal numerical method of the inflatable membrane structure under the pressure difference is validated by the model testing of the inflatable cantilever tube. The finite element model of 75m airships is established to simulate the vibration characteristics subjected to only pressure difference and the resultant force of weight and buoyancy. The nonlinear static deformation and stress analysis are investigated for two kinds of equilibrated configurations with various pressure differences, as well as the vibration characteristics. The structural efficiency of the suspended curtain is investigated through the force transfer ratio at the assumed equilibrated point. The effects of manufacture error of the suspended cable length on the structural behavior are analyzed. The results indicate that the local area of airship envelope connected to the suspended cable is a weak part. Various pressures and pressure gradients have significant effects on the global airship structure and the suspended curtain. The suspended curtain is effective to transfer the equilibrated force from the bottom to the top of airship envelope. Manufacture error of the suspended cable length could result in obvious deformation of local airship envelope. The presented work is valuable to the structural engineering design of stratospheric airship.

关键词: non-rigid airship, suspended curtain, pressure difference, net buoyant density, manufacture error

Abstract: In order to evaluate the vibration characteristics of non-rigid airship with suspended curtain, we introduce vibration characteristic analysis method of the inflatable membrane structure. Modal numerical method of the inflatable membrane structure under the pressure difference is validated by the model testing of the inflatable cantilever tube. The finite element model of 75m airships is established to simulate the vibration characteristics subjected to only pressure difference and the resultant force of weight and buoyancy. The nonlinear static deformation and stress analysis are investigated for two kinds of equilibrated configurations with various pressure differences, as well as the vibration characteristics. The structural efficiency of the suspended curtain is investigated through the force transfer ratio at the assumed equilibrated point. The effects of manufacture error of the suspended cable length on the structural behavior are analyzed. The results indicate that the local area of airship envelope connected to the suspended cable is a weak part. Various pressures and pressure gradients have significant effects on the global airship structure and the suspended curtain. The suspended curtain is effective to transfer the equilibrated force from the bottom to the top of airship envelope. Manufacture error of the suspended cable length could result in obvious deformation of local airship envelope. The presented work is valuable to the structural engineering design of stratospheric airship.

Key words: non-rigid airship, suspended curtain, pressure difference, net buoyant density, manufacture error

中图分类号:

TP 391

CHEN Yu-feng* (陈宇峰), CHEN Wu-jun (陈务军), HE Yan-li (何艳丽), ZHANG Da-xu (张大旭). Vibration Characteristic Analysis and Experiment of Non-Rigid Airship with Suspended Curtain[J]. 上海交通大学学报（英文版）, 2015, 20(5): 625-633.

CHEN Yu-feng* (陈宇峰), CHEN Wu-jun (陈务军), HE Yan-li (何艳丽), ZHANG Da-xu (张大旭). Vibration Characteristic Analysis and Experiment of Non-Rigid Airship with Suspended Curtain[J]. Journal of shanghai Jiaotong University (Science), 2015, 20(5): 625-633.

参考文献

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[8] Gao Hai-jian. Structure analysis theory and performance research for large flexible airship of stratospheric platform [D]. Shanghai: School of Naval Architecture,Ocean and Civil Engineering, Shanghai Jiao Tong University, 2010(in Chinese).
[9] Gao Hai-jian, ChenWu-jun, Fu Gong-yi, et al. Structural analysis of flexible airship on stratospheric platform based on engineering elastic theory [J]. Journal of Shanghai Jiaotong University, 2010, 44(11): 1583-1588 (in Chinese).
[10] Gao Hai-jian, ChenWu-jun, Fu Gong-yi, et al. Deformation analysis method and performance evaluation for flexible airship of stratospheric platform considering pressure effects [J]. Chinese Journal of Applied Mechanics, 2012, 29(4): 374-379 (in Chinese).
[11] Chen W J, Zhang D X, Duan D P, et al. Equilibrium configuration analysis of non-rigid airship subjected to weight and buoyancy [C]//Proceedings of 11th AIAA Aviation Technology, Integration, and Operations Conference. Virginia Beach, VA: AIAA, 2011:1-12
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