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首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >MODELING OF THE HEAVE AND THE CUSHION PRESSURE OF AIR CUSHION LANDING SYSTEM (ACLS): CHAOTIC DYNAMICS INVESTIGATION
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MODELING OF THE HEAVE AND THE CUSHION PRESSURE OF AIR CUSHION LANDING SYSTEM (ACLS): CHAOTIC DYNAMICS INVESTIGATION

机译：气垫着陆系统的升降和垫压力建模（ACL）：混沌动力学调查

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摘要

A theoretical model for the dynamics behavior of an incompressible Air Cushion Landing System (ACLS) is introduced. In this model the incompressible Bernoulli's equation and the Newton's second law of motion are used to predict the dynamic behavior of the heave (vertical response) of the ACLS in both time and frequency domains. The mass flow rate inside the air cushion of this model is assumed to be constant. The self excited response for the heave and the cushion pressure of the ACLS are calculated. In this study, the dimensionless mass flow rate and the dimensionless skirt of the ACLS's skirt are the only parameters which are considered to be investigated to control the steady state behavior of the oscillatory motion of the ACLS. The equations of motion of the proposed nonlinear model are solved numerically using a code written on the Matlab software which is based on the Runge Kutta numerical integration method. The chaotic behavior of the heave motion and cushion pressure dynamics are investigated with the aid of the Fourier analysis and the Poincare map. Periodic behavior is noticed in the vertical motion; on the other hand a chaotic behavior is manifest in the pressure inside the cushion volume of the ACLS. This model will help designers of the ACLS to understand the dynamics behavior of this system in order to redesign such system so that the violent oscillatory self excited motion can be reduced or eliminated.
机译：介绍了不可压缩空气垫落地系统（ACL）的动态行为的理论模型。在该模型中，不可压缩的Bernoulli等式和牛顿第二次运动定律用于预测ACL在两个时间和频率域中的升降（垂直响应）的动态行为。假设该模型的空腹内部的质量流量是恒定的。计算升降的自兴奋剂和ACL的垫子压力。在该研究中，ACLS裙部的无量纲质量流量和无量纲裙的唯一参数被认为被研究以控制ACL的振荡运动的稳态行为。使用在MATLAB软件上写入的代码基于Runge Kutta数值积分方法，在数值上进行数字地解决了所提出的非线性模型的运动方程。借助于傅立叶分析和庞加勒地图，研究了升降运动和缓冲压力动力学的混沌行为。在垂直运动中注意到定期行为;另一方面，混沌行为在ACL的垫子体积内的压力中显现出来。该模型将帮助ACL的设计者了解该系统的动态行为，以便重新设计这种系统，以便可以减少或消除剧烈的振荡自兴奋运动。

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