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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
韩明
《中国工程科学》 2003年 第5卷 第3期 页码 51-56
提出了可靠性工程中参数的一种估计方法——新Bayes估计法,给出了失效概率、失效率的新Bayes估计的定义及其新Bayes估计。最后,结合实际问题的数据,进行了具体计算和分析,结果表明所提出的新Bayes估计法有效、可行,便于工程技术人员在工程中应用。
Development of an analytical model to estimate the churning losses in high-speed axial piston pumps
《机械工程前沿(英文)》 2022年 第17卷 第2期 doi: 10.1007/s11465-021-0671-1
关键词: axial piston pump rotating parts high rotational speed churning losses drag torque
Qun CHAO, Jianfeng TAO, Junbo LEI, Xiaoliang WEI, Chengliang LIU, Yuanhang WANG, Linghui MENG
《机械工程前沿(英文)》 2021年 第16卷 第1期 页码 176-185 doi: 10.1007/s11465-020-0616-0
关键词: axial piston pump cavitation speed limitation scaling law
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
Tiago Miguel FERREIRA, João ESTÊVÃO, Rui MAIO, Romeu VICENTE
《结构与土木工程前沿(英文)》 2020年 第14卷 第3期 页码 609-622 doi: 10.1007/s11709-020-0623-6
关键词: Artificial Neural Networks seismic vulnerability masonry buildings damage estimation vulnerability curves
A hybrid machine learning model to estimate self-compacting concrete compressive strength
Hai-Bang LY; Thuy-Anh NGUYEN; Binh Thai PHAM; May Huu NGUYEN
《结构与土木工程前沿(英文)》 2022年 第16卷 第8期 页码 990-1002 doi: 10.1007/s11709-022-0864-7
关键词: artificial neural network grey wolf optimize algorithm compressive strength self-compacting concrete
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
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
Guilian YI, Yunkang SUI, Jiazheng DU
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 229-234 doi: 10.1007/s11465-011-0128-z
To reduce vibration and noise, a damping layer and constraint layer are usually pasted on the inner surface of a gearbox thin shell, and their thicknesses are the main parameters in the vibration and noise reduction design. The normal acceleration of the point on the gearbox surface is the main index that can reflect the vibration and noise of that point, and the normal accelerations of different points can reflect the degree of the vibration and noise of the whole structure. The K-S function is adopted to process many points’ normal accelerations as the comprehensive index of the vibration characteristics of the whole structure, and the vibration acceleration level is adopted to measure the degree of the vibration and noise. Secondary development of the Abaqus preprocess and postprocess on the basis of the Python scripting programming automatically modifies the model parameters, submits the job, and restarts the analysis totally, which avoids the tedious work of returning to the Abaqus/CAE for modifying and resubmitting and improves the speed of the preprocess and postprocess and the computational efficiency.
关键词: Abaqus secondary development Python language vibration and noise reduction K-S function vibration acceleration level
Integrated virtual-design methods for forecasting radiated noise of single cylinder diesel block
GUO Lei, HAO Zhiyong, XU Hongmei, LIU Lianyun
《能源前沿(英文)》 2008年 第2卷 第4期 页码 416-421 doi: 10.1007/s11708-008-0097-z
关键词: bearing dynamical frequency response dynamical simulation hybrid dynamical
Min-Ho CHEY, Jae-Ung KIM
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 267-280 doi: 10.1007/s11709-012-0170-x
关键词: tuned mass damper parametric optimization passive control white noise earthquake excitation
Multi-UAV cooperative target tracking with bounded noise for connectivity preservation
Rui Zhou, Yu Feng, Bin Di, Jiang Zhao, Yan Hu,jzhao@buaa.edu.cn
《信息与电子工程前沿(英文)》 2020年 第21卷 第10期 页码 1413-1534 doi: 10.1631/FITEE.1900617
Muhammad WASEEM, Frauke KACHHOLZ, Jens TRÄNCKNER
《农业科学与工程前沿(英文)》 2018年 第5卷 第4期 页码 420-431 doi: 10.15302/J-FASE-2018243
Various process-based models are extensively being used to analyze and forecast catchment hydrology and water quality. However, it is always important to select the appropriate hydrological and water quality modeling tools to predict and analyze the watershed and also consider their strengths and weaknesses. Different factors such as data availability, hydrological, hydraulic, and water quality processes and their desired level of complexity are crucial for selecting a plausible modeling tool. This review is focused on suitable model selection with a focus on desired hydrological, hydraulic and water quality processes (nitrogen fate and transport in surface, subsurface and groundwater bodies) by keeping in view the typical lowland catchments with intensive agricultural land use, higher groundwater tables, and decreased retention times due to the provision of artificial drainage. In this study, four different physically based, partially and fully distributed integrated water modeling tools, SWAT (soil and water assessment tool), SWIM (soil and water integrated model), HSPF (hydrological simulation program– FORTRAN) and a combination of tools from DHI (MIKE SHE coupled with MIKE 11 and ECO Lab), have been reviewed particularly for the Tollense River catchment located in North-eastern Germany. DHI combined tools and SWAT were more suitable for simulating the desired hydrological processes, but in the case of river hydraulics and water quality, the DHI family of tools has an edge due to their integrated coupling between MIKE SHE, MIKE 11 and ECO Lab. In case of SWAT, it needs to be coupled with another tool to model the hydraulics in the Tollense River as SWAT does not include backwater effects and provision of control structures. However, both SWAT and DHI tools are more data demanding in comparison to SWIM and HSPF. For studying nitrogen fate and transport in unsaturated, saturated, and river zone, HSPF was a better model to simulate the desired nitrogen transformation and transport processes. However, for nitrogen dynamics and transformations in shallow streams, ECO Lab had an edge due its flexibility for inclusion of user-desired water quality parameters and processes. In the case of SWIM, most of the input data and governing equations are similar to SWAT but it does not include water bodies (ponds and lakes), wetlands and drainage systems. In this review, only the processes that were needed to simulate the Tollense River catchment were considered, however the resulted model selection criteria can be generalized to other lowland catchments in Australia, North-western Europe and North America with similar complexity.
关键词: diffuse pollution ECO Lab HSPF lowland catchment MIKE 11 MIKE SHE modeling tools SWAT SWIM Tollense River water quality
Numerical analysis of aerodynamic noise radiated from cross flow fan
CHEN Anbang, LI Song, HUANG Dongtao
《能源前沿(英文)》 2008年 第2卷 第4期 页码 443-447 doi: 10.1007/s11708-008-0063-9
关键词: predicted aerodynamic Williams-Hawkings calculated pressure aerodynamic performance unsteady Reynolds-averaged
标题 作者 时间 类型 操作
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
Development of an analytical model to estimate the churning losses in high-speed axial piston pumps
期刊论文
Fast scaling approach based on cavitation conditions to estimate the speed limitation for axial piston
Qun CHAO, Jianfeng TAO, Junbo LEI, Xiaoliang WEI, Chengliang LIU, Yuanhang WANG, Linghui MENG
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
The use of Artificial Neural Networks to estimate seismic damage and derive vulnerability functions for
Tiago Miguel FERREIRA, João ESTÊVÃO, Rui MAIO, Romeu VICENTE
期刊论文
A hybrid machine learning model to estimate self-compacting concrete compressive strength
Hai-Bang LY; Thuy-Anh NGUYEN; Binh Thai PHAM; May Huu NGUYEN
期刊论文
Investigation of flow dynamics and decrease of vortex noise inside volute of centrifugal fans
LI Chunxi, WANG Songling
期刊论文
Application of python-based Abaqus preprocess and postprocess technique in analysis of gearbox vibration and noise
Guilian YI, Yunkang SUI, Jiazheng DU
期刊论文
Integrated virtual-design methods for forecasting radiated noise of single cylinder diesel block
GUO Lei, HAO Zhiyong, XU Hongmei, LIU Lianyun
期刊论文
of structural responses using an optimal passive tuned mass damper under stationary Gaussian white noise
Min-Ho CHEY, Jae-Ung KIM
期刊论文
Multi-UAV cooperative target tracking with bounded noise for connectivity preservation
Rui Zhou, Yu Feng, Bin Di, Jiang Zhao, Yan Hu,jzhao@buaa.edu.cn
期刊论文
Suitability of common models to estimate hydrology and diffuse water pollution in North-eastern German
Muhammad WASEEM, Frauke KACHHOLZ, Jens TRÄNCKNER
期刊论文