| 1. | A new method for feature extraction in ship noise
基于多重分形的舰船噪声特征提取 |
| 2. | The examples of suppressing ship noise interference are also given in this paper
文中给出了压制船干扰的实例。 |
| 3. | Upbuild the signal model for ship noise , deduce the relationship between sound pressure and particle velocity in plane wave
建立本舰噪声的信号模型，推导了平面波声场声压和振速的相关性。 |
| 4. | ( 2 ) introduce the basic knowledge of acoustics , the main sources of ship noise , the transmit route and characteristic , aiming to provide the basic knowledge of noise
( 2 )对噪声的基础知识、船舶的主要噪声源及其传播途径和特点进行阐述，为后续的噪声预测提供理论依据。 |
| 5. | For ship mounted sonar , the transducer received not only the required signal but also the ship noise . for distant signal , the ship noise is a strong interference
在船用声呐环境中，基阵所接收的除了可能有的目标信号外，还存在本舰噪声，它对于远方的目标信号是一个强大的干扰源。 |
| 6. | This article qualitative introduced the use tree planting method , during beautified environment , reduces the ships noise to the environment pollution , expanded the tree planting potency
摘要针对船舶噪音与居住环境的矛盾逐渐突出，提出了利用绿化手段，降低船舶噪音对环境的污染，扩展了绿化的效能。 |
| 7. | With the development of technology , the enhancement of people " living standard and the need of military strategy , the problem of ship noise controlling has received an increasing attention
随着科学的发展，人们生活水平的进一步提高和军事战略的需要，船舶的噪声及其控制问题已日益受到人们的关注。 |
| 8. | We can compensate the phase difference and subtract at the direction of ship noise , then the noise can be cancelled . the merit o f this method is simple , stable and efficient . the main contents are : 1
首先介绍了噪声抵消的一般方法，并且结合拖曳阵本舰噪声的抵消问题研究了自适应法和双线列阵相减法对本舰噪声的抑制模型及原理。 |
| 9. | The results show that the self - adaptive filter can be used to detect line spectrum , the wavelet transform and the fourier transform can be used to detect the ship noise in modulating the anisotropic noise field
结果表明：自适应滤波对于各向异性噪声场中的线谱检测有良好的效果；而小波变换和短时傅里叶变换对各向异性噪声场中的舰船噪声调制信号检测有良好的效果。 |
| 10. | The ship radiated noise is analyzed and its 4 features are extracted from the envelop spectrum . the envelope of ship noise waveform can be demodulated utilizing hilbert transform , and the spectrum components with line rotation frequency of propeller shaft are extracted effectively by bispectrum , 1 ( 1 / 2 ) spectrum and 2 ( 1 / 2 ) spectrum analysis
对于通过希尔伯特变换解出的舰船辐射噪声包络信号进行高阶统计量分析，有效地提取出了舰船噪声的双谱、 11 / 2维谱、 21 / 2维谱等方面的特征。 |
