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J. Cent. South Univ. (2018) 25: 1409-1417 DOI: https://doi.org/10.1007/s11771-018-3836-2 Acoustic pressure simulation and experiment design in seafloor mining environment ZHAO Hai-ming(赵海鸣)1, 2... the suspended sediments have severe influence on acoustic radiated field of transducer, it is significant for sonar system to analyze the influence of suspended sediments on acoustic pressure in the seafloor......
City University, Yiyang 413049, China)Abstract:Acoustic emission tests were performed using a split hopkinson pressure bar system (SHPB) on 50-mm-diameter bars of granite, limestone, sandstone and skarn... words:rock; acoustic emission (AE); split hopkinson pressure bar (SHPB); hit driven features; frequency characteristics; correlation analysis......
samples were sintered at 1250 °C and then cut into d50 mm plates for acoustic absorption study, as shown in Fig. 1. The test was conducted under atmospheric pressure using a self-made high...J. Cent. South Univ. (2017) 24: 1762-1766 DOI: https://doi.org/10.1007/s11771-017-3584-8 High-temperature acoustic properties of porous titanium fiber metal materials LIU Shi-feng(刘世锋)1, 2, LI An(李安......
the pressure of the underwater acoustic data transmission, reduce system costs, and significantly improve system efficiency. The IOMP algorithm can decrease the computing time by about 20% compared...J. Cent. South Univ. (2016) 23: 1981-1989 DOI: 10.1007/s11771-016-3255-1 An underwater acoustic data compression method based on compressed sensing GUO Xiao-le(郭晓乐)1, 2, YANG Kun-de(杨坤德)1, 2, SHI......
J. Cent. South Univ. (2012) 19: 2373-2379 DOI: 10.1007/s11771-012-1284-y Using acoustic technique to detect leakage in city gas pipelines CHEN Zhi-gang(陈志刚), LIAN Xiang-jiao(连香姣), HE Liang(赫亮...-Verlag Berlin Heidelberg 2012 Abstract: For solving the difficult problem of leakage detection in city gas pipelines, a method using acoustic technique based on instantaneous energy (IE) distribution......
turbines [J]. Mechanical Systems and Signal Processing, 2006, 20(4): 983-1007. [6] ENNACEUR C, LAKSIMI A, HERVE C, CHERFAOUI M. Monitoring crack growth in pressure vessel steels by the acoustic emission technique and the method of potential difference [J]. International Journal of Pressure Vessels and Piping, 2006, 83(3): 197-204. [7] MBA D, HALL L D. The transmission of acoustic emission across......
J. Cent. South Univ. (2016) 23: 2397-2401 DOI: 10.1007/s11771-016-3298-3 Time-domain CFD computation and analysis of acoustic attenuation performance of water-filled silencers LIU Chen(刘晨)1, JI Zhen... (CFD) approach is extended to calculate the acoustic attenuation performance of water-filled piping silencers. Transmission loss predictions from the time-domain CFD approach and the frequency-domain......
Numerical simulation of acoustic pressure field for ultrasonic grain refinement of AZ80 magnesium alloy SHAO Zhi-wen, LE Qi-chi, ZHANG Zhi-qiang, CUI Jian-zhong Key Laboratory of Electromagnetic... are subjected to different acoustic pressures and the effect of grain refinement by ultrasonic treatment for these samples is different. With the increase of ultrasonic intensity, the acoustic pressure......
and acoustic emission activity pattern was obtained. After the confining pressure was unloaded, the radial strain grew much faster than the axial strain, which induced the volumetric strain growing... of the acoustic emission energy signal of sandstone samples, which are in the loading path of confining pressure unloading prior to the peak stress and under the respective coupling conditions......
reduction advice was proposed. The results show that the aerodynamic noise is a kind of wide frequency noise which exits in wide frequency band without obvious main frequency. The acoustic pressure amplitude of every test point is great at low frequency, decreasing with the increase of frequency, and the acoustic pressure level within 1/3 octave band frequency ranges from 315 Hz to 1 250 Hz. Given......