基于水下滑翔机平台的湍流观测方法研究

Study on the Turbulence Measurement Method Based on Underwater Glider Platform

海洋微结构湍流作为常见的海洋运动,对海洋中溶解质扩散、能量转移有显著作用,对海水运动及其温盐特性等有重要影响。作为低能耗、无动力的海洋观测平台,水下滑翔机具有噪声低、航时长,易回收等优点,使得长期不间断低成本观测湍流成为了可能。在本文中,从湍流观测原理的维度出发,研究分析滑翔机运动特性对湍流数据的影响;通过解析滑翔机在垂直面内运动方程,获得适合湍流观测的滑翔机运动参数;利用傅里叶变换从时域与频域分析了滑翔机的振动特性;最后通过海试,验证了基于水下滑翔机的湍流观测平台长时间不间断观测海洋湍流的能力。

As a common form of seawater motion,marine micro-structural turbulence plays a significant role in dissolved matter diffusion and energy transfer in the sea,and has an important influence on the characteristics of movement,temperature and salt of seawater.As a marine observation platform with low energy consumption and no power,underwater glider has the advantages of low noise,long navigation time and easy recovery,so that the long-term uninterrupted and low-cost observation of the sea turbulence becomes possible.In the present paper,effects of the glider motion characters on the turbulence data are analyzed from the dimensions of turbulence observation principle.By solving the glider motion equation within a vertical plane,the glider motion parameters satisfying the requirements of sea turbulence observation are obtained.By Fourier transform,the vibration characteristics of the underwater glider are analyzed from both time domain and frequency domain.The ability of the long-term uninterrupted sea turbulence observation by using the underwater glider as the platform has been verified through sea tests.