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Target tracking methods based on a signal-to-noise ratio model
Dai Liu, Yong-bo Zhao, Zi-qiao Yuan, Jie-tao Li, Guo-ji Chen,ybzhao@xidian.edu.cn
《信息与电子工程前沿（英文）》 2020年 第21卷 第12期 页码 1671-1814 doi: 10.1631/FITEE.1900679
De-noising of diesel vibration signal using wavelet packet and singular value decomposition
DUAN Li-xiang, ZHANG Lai-bin, WANG Zhao-hui
《机械工程前沿（英文）》 2006年 第1卷 第4期 页码 443-447 doi: 10.1007/s11465-006-0055-6
关键词： coefficient de-noised cylinder signal-to-noise wavelet decomposition
Zilin HUANG,Gang WANG,Shaopeng WEI,Changhong LI,Yiming RONG
《机械工程前沿（英文）》 2016年 第11卷 第3期 页码 242-249 doi: 10.1007/s11465-016-0397-7
Laser hot wire cladding, with the prominent features of low heat input, high energy efficiency, and high precision, is widely used for remanufacturing metal parts. The cladding process, however, needs to be improved by using a quantitative method. In this work, volumetric defect ratio was proposed as the criterion to describe the integrity of forming quality for cladding layers. Laser deposition experiments with FV520B, one of martensitic stainless steels, were designed by using the Taguchi method. Four process variables, namely, laser power (P), scanning speed (Vs), wire feed rate (Vf), and wire current (I), were optimized based on the analysis of signal-to-noise (S/N) ratio. Metallurgic observation of cladding layer was conducted to compare the forming quality and to validate the analysis method. A stable and continuous process with the optimum parameter combination produced uniform microstructure with minimal defects and cracks, which resulted in a good metallurgical bonding interface.
关键词： process optimization Taguchi method signal-to-noise (S/N) ratio volumetric defect ratio laser hot wire cladding
韩修廷,王洁春,焦振强,高飞,宋宇波
《中国工程科学》 2005年 第7卷 第10期 页码 64-68
提出了在套损振动波检测过程中提高信号信噪比的方法。检测过程中，在井口敲击套管并接收、分析套管的回波，以了解介质的变化情况。由于反射波信号强度较微弱，单纯用一组接收信号无法进行正确的套损分析，采用信号增强方法，即利用多个类似信号进行叠加，增强反射波的有效信号，降低背景噪声，从而得到有用信息，进行正确的套损状况分析。开发了相应的信号处理软件，提高了信号处理速度。通过10井次的测试表明，技术原理可行，软件工作稳定、可靠，便于操作，可以进行多种方法的信号处理，极大地提高了工作效率。
Jin WANG,Feng SHU,Ri-qing CHEN,Yu-di CUI,Yu CHEN,Jun LI
《信息与电子工程前沿（英文）》 2016年 第17卷 第3期 页码 265-280 doi: 10.1631/FITEE.1500134
关键词： Multi-pair two-way relay Adaptive robust beamformer Channel state information (CSI) Maximum signal-to-interference-and-noise ratio (Max-SINR) Maximum signal-to-leakage-and-noise ratio (Max-SLNR)
杨建文,贾民平,许飞云,胡建中
《中国工程科学》 2005年 第7卷 第8期 页码 66-69
分析了经验模式分解的滤波性能；针对旋转机械振动信号信噪比低及非平稳特性，应用经验模式分解对振动信号进行降噪处理，突出了有用振动信号，为旋转机械在线监测和故障诊断提供了有效的依据；仿真实验及真实数据分析表明，经验模式分解在振动信号降噪处理中是有效的，为振动信号分析提供了新的方法。
Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI
《结构与土木工程前沿（英文）》 2020年 第14卷 第2期 页码 446-472 doi: 10.1007/s11709-019-0605-8
关键词： ambient vibration test high level noise iterative signal enhancement wavelet cross and autocorrelation of wavelets
基于特征分析和最大信干噪比波束形成器的鲁棒广义旁瓣消除器 Research Articles
Quan-dong WANG, Liang-hao GUO, Wei-yu ZHANG, Sui-ling REN, Chao YAN
《信息与电子工程前沿（英文）》 2019年 第20卷 第7期 页码 975-987 doi: 10.1631/FITEE.1700367
Design of noise-reduction seats for high-speed trains
Xiaojun DENG, Yanju ZHAO, Haijin ZHANG, Renzhong SHUAI, Leiwei ZHU
《机械工程前沿（英文）》 2018年 第13卷 第3期 页码 385-389 doi: 10.1007/s11465-017-0438-x
Noise-reduction seats have been successfully used in concert halls, theaters, and other places that reduce noise. In this study, a new noise-reduction seat design was proposed for high-speed trains, which have unique interior noise spectral characteristics. First, before the noise-reduction seat models were fabricated, the parameters of high-performance sound-absorbing materials and perforated plates were selected by conducting a standing-wave tube test. The sound-absorption effects of the noise-reduction seats and normal seats were investigated and compared in a reverberation chamber. Test results showed that, compared with normal seats, the noise-reduction seats obtained a significantly improved sound-absorption coefficient in the entire frequency band. Furthermore, the test results were used to establish a simulation model for calculation, and the simulation results proved that the noise-reduction seats substantially reduced the noise in an entire train car. Finally, the noise-reduction seats were fabricated and installed in a full train car of an actual high-speed train. The test results showed that, compared with the normal seats, the noise-reduction seats decreased the noise level at a standard point in the passenger car by 1.5 dB. Therefore, the noise-reduction seats are effective in noise reduction.
关键词： high-speed train sound-absorbing materials perforated board noise-reduction seats
具有深度阈值噪声消除的多尺度分析调制识别网络 Research Article
李响1,2,李一兵1,2,汤春瑞3,4,李迎松1,2
《信息与电子工程前沿（英文）》 2023年 第24卷 第5期 页码 742-758 doi: 10.1631/FITEE.2200253
Anovel approach of noise statistics estimate using H∞ filter in target tracking
Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG
《信息与电子工程前沿（英文）》 2016年 第17卷 第5期 页码 449-457 doi: 10.1631/FITEE.1500262
珊瑚岛礁环境噪声成像 Article
夏少红, 张昌榕, 曹敬贺
《工程（英文）》 2023年 第25卷 第6期 页码 182-193 doi: 10.1016/j.eng.2021.09.022
As valuable land in the ocean, coral islands are not only important bases for making use of marine resources and protecting marine rights and interests, but also important for breakthrough research in many fields of earth science. Hence, the economical and efficient determination of the underground structure of coral islands has become significant in coral island engineering geology, but remains challenging for traditional marine geophysical prospecting and drilling methods. While ambient noise tomography with dense arrays has been widely used in continental regions, its applicability to coral islands remains undetermined. In this study, based on the data recorded by a dense array on an isolated coral island in the South China Sea, we analyzed the ambient noise characteristics and obtained a 3D subsurface structure of the coral island using ambient noise tomography. We made the following findings: ① The ambient noise frequencies can be roughly categorized into three levels: < 1, 1–5, and > 5 Hz. The spectral characteristics of the noise below 5 Hz were consistent at different stations, but there were significant differences in the characteristics of the noise above 5 Hz. ② For ambient noise frequencies below 5 Hz, cross-correlation functions with high quality could be obtained with only 24 h of waveform data. However, it was difficult to extract meaningful cross-correlation functions for ambient noise frequencies above 5 Hz. ③ The S-wave velocity in the coral island was higher toward the sea and lower toward the lagoon, which was consistent with the high degree of cementation of the outer reef flat stratum on the seaward side. ④ There were two low-velocity horizons at 25–75 and 200–300 m, which were in good agreement with the high-porosity horizons that were revealed by drilling core samples, reflecting the weathering history of the reef. Our research demonstrates that ambient noise tomography is a potentially economical, efficient, and environmentally friendly method for the geological prospecting of coral reefs.
关键词： Coral island Ambient noise tomography Engineering geology South China Sea
CHARACTERISTICS OF HERBIVORY/WOUND-ELICITED ELECTRICAL SIGNAL TRANSDUCTION IN TOMATO
《农业科学与工程前沿（英文）》 2021年 第8卷 第2期
Electrical signals commonly occur in plants in response to various environmental changes and have a dominant function in plant acclimation. The transduction of wound-elicited electrical signals in the model plant species Arabidopsis has been characterized but the characteristics of electrical signal transduction in response to herbivory or wounding in crop species remain unknown. Here, the features of electrical signals elicited by insect herbivory and wounding in tomato were investigated. Unlike those in Arabidopsis, wounding tomato leaves did not cause leaf-to-leaf electrical signal transduction. In contrast, electrical signals elicited in response to petiole wounding were stronger and more strongly transduced. Leaflet wounding also activated electrical signal transduction and jasmonic acid (JA) signaling within the whole compound leaf. It was also demonstrated that tomato glutamate receptor-like 3.3 (GLR3.3) and GLR3.5 mediated leaflet-to-leaflet electrical signal transduction. Herbivory-induced JA accumulation and Helicoverpa armigera resistance were reduced in glr3.3/3.5 plants. This work reveals the nature of electrical signal transduction in tomato and emphasizes the key roles of GLR3.3 and GLR3.5 in electrical signal transduction and JA signaling activation.
关键词： electrical signal / glutamate receptor-like / herbivory / jasmonic acid / tomato
Investigation of flow dynamics and decrease of vortex noise inside volute of centrifugal fans
LI Chunxi, WANG Songling
《能源前沿（英文）》 2008年 第2卷 第2期 页码 235-240 doi: 10.1007/s11708-008-0040-3
关键词： cylinder-shaped evolution computational effective large-scale
标题 作者 时间 类型 操作
Target tracking methods based on a signal-to-noise ratio model
Dai Liu, Yong-bo Zhao, Zi-qiao Yuan, Jie-tao Li, Guo-ji Chen,ybzhao@xidian.edu.cn
期刊论文
De-noising of diesel vibration signal using wavelet packet and singular value decomposition
DUAN Li-xiang, ZHANG Lai-bin, WANG Zhao-hui
期刊论文
Process improvement in laser hot wire cladding for martensitic stainless steel based on the Taguchi method
Zilin HUANG,Gang WANG,Shaopeng WEI,Changhong LI,Yiming RONG
期刊论文
Adaptive robust beamformer formulti-pair two-way relay networks with imperfect channel state information
Jin WANG,Feng SHU,Ri-qing CHEN,Yu-di CUI,Yu CHEN,Jun LI
期刊论文
Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely noisy ambient vibration tests in Shiraz-Iran
Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI
期刊论文
基于特征分析和最大信干噪比波束形成器的鲁棒广义旁瓣消除器
Quan-dong WANG, Liang-hao GUO, Wei-yu ZHANG, Sui-ling REN, Chao YAN
期刊论文
Design of noise-reduction seats for high-speed trains
Xiaojun DENG, Yanju ZHAO, Haijin ZHANG, Renzhong SHUAI, Leiwei ZHU
期刊论文
Anovel approach of noise statistics estimate using H∞ filter in target tracking
Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG
期刊论文
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