| 丁超,邱家兴,程健,程玉胜.船舶螺旋桨空化噪声解调包络形状仿真研究[J].声学技术,2019,38(6):611~616 |
| 船舶螺旋桨空化噪声解调包络形状仿真研究 |
| Simulation research on the demodulation envelope shapes of vessel propeller cavitation noise |
| 投稿时间：2018-09-18 修订日期：2018-10-20 |
| DOI：10.16300/j.cnki.1000-3630.2019.06.002 |
| 中文关键词: 解调包络 波包形状 包络模型 |
| 英文关键词: demodulation envelope the shape of wave packet envelope model |
| 基金项目: |
|
| 摘要点击次数: 915 |
| 全文下载次数: 438 |
| 中文摘要: |
| 船舶螺旋桨空化噪声解调包络是一系列形状基本一致、间隔基本相等、高度有一定随机性、成组结构的波包。而波包形状会直接影响到解调谱的结构形状。通过分析比较实测信号、解调包络形状，将波包形状分为两大类：圆滑型和尖锐型，并分别设置了对应的两种仿真模型：半正弦模型和高斯模型。仿真信号和实测信号的检验结果表明，半正弦模型能够更好地模拟圆滑型包络的特点，高斯模型能够更好地模拟尖锐型包络的特点。 |
| 英文摘要: |
| The demodulation envelopes of vessel propeller cavitation noise is a series of wave packets with basically similar shapes, almost equal intervals and a certain randomness in amplitude, moreover, these wave packets are in groups. The shapes of wave packets can directly affect the structures and shapes of the demodulation spectrums. By analyzing and comparing the demodulation envelope shapes of measured signals, it is shown that the shapes of wave packets can be divided into two types:smooth type and sharp type, and correspondingly, two simulation models can be set up:semi-sine wave model and Gaussian model. The test results of simulated and measured signals show that the semi-sine wave model can better simulate the characteristics of smooth envelope, and the Gaussian model can better simulate the characteristics of sharp envelope. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
