首页 | 期刊介绍 | 编委会 | 道德声明 | 投稿指南 | 常用下载 | 过刊浏览 | In English
引用本文:刘宁,魏晓辉,王斌,董涛.基于MEMS加速度计空投浮标的波浪测量方法试验研究[J].海洋科学,2020,44(9):146-153.
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 53次   下载 52 本文二维码信息
码上扫一扫!
分享到: 微信 更多
基于MEMS加速度计空投浮标的波浪测量方法试验研究
刘宁, 魏晓辉, 王斌, 董涛
国家海洋技术中心, 天津 300110
摘要:
针对基于MEMS加速度传感器的空投波浪浮标存在采样频率与测波精度低的问题,根据频域衰减积分算法,提出一种相应的波浪测量算法,为了验证该算法测波的准确性,开展了多功能水槽试验研究。该算法旨在将MEMS加速度传感器输出的加速度与姿态角转化为浮标运动的波形,首先将加速度与姿态角信号进行竖向处理获得竖直方向的加速度,再利用离散傅里叶变换将竖向加速度转化为频域内的加速度复数序列,然后引入控制函数减弱低频噪声,经过频域积分、离散傅里叶逆变换、时域积分获得竖直方向的位移,最后通过后处理得到最终的波形。多功能水槽试验采取10中不同波高和周期的工况,对比空投波浪测量浮标与波高仪的测量结果,试验结果表明,浮标的测量误差在10%以内,达到测波标准。
关键词:  波浪测量  MEMS加速度计  浮标  波浪模拟试验  频域积分
DOI:10.11759/hykx20200115001
分类号:P716
基金项目:国家重点研发计划重点专项课题(2016YFC1400501)
Experimental study on the new wave measurement method of air-launched buoys using a MEMS accelerometer
LIU Ning, WEI Xiao-hui, WANG Bin, DONG Tao
National Ocean Technology Center, Ministry of Nature Resources, Tianjin 300110, China
Abstract:
In our study, the method of wave measurement using the frequency-domain attenuation integral algorithm is proposed to solve the problem of low accuracy of an air-launched wave measurement buoy that consists of a MEMS acceleration sensor, and the method is analyzed by conducting simulation experiments in a multifunction pond. The algorithm transforms acceleration and attitude angle measured by a MEMS accelerometer into the waveform of a buoy's motion. First, vertical acceleration is obtained by processing accelerations and attitude angles. The complex conjugate of acceleration in a frequency domain is obtained using Discrete Fourier Transform, and then a control function is introduced for decreasing low-frequency noise. The vertical displacement of a buoy can be acquired by frequency-domain integration, Inverse Discrete Fourier Transform, and time-domain integration. Finally, wave patterns are obtained by post processing. Multifunction pond experiments were conducted or simulated using 10 different wave heights and wave periods to compare the data measured by both air-launched wave buoy and wave height gauge. It is found that all the measurement errors of the air-launched buoy are less than 10% when the results are compared with the buoy-based wave measurement system, and it confirms an improved accuracy of new proposed method.
Key words:  wave measurement  MEMS accelerometer  buoy  wave simulation experiments  frequency-domain integration
版权所有 《海洋科学》编辑部 Copyright©2008 All Rights Reserved
主管单位:中国科学院 主办单位:中国科学院海洋研究所
地址:青岛市南海路七号  邮编:266071  电话:0532-82898755  E-mail:marinesciences@qdio.ac.cn
技术支持:北京勤云科技发展有限公司