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Factors Analysis of Influencing of Steel Catenary Riser

WANG Hong-xia;LI Zhe

2011, 31 (4): 26-28. DOI: 10.3969/j.issn.1006-1355-2011.04.006

Abstract （1817）

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Generally, there is high-pressure oil or gas inside the ocean riser. The velocity of the fluid will greatly influence the vibration response of the riser. In this paper, the affect of fluid velocity in the riser on the natural frequency of steel catenary riser (SCR) structure is studied. The results show that the natural frequency decreases with the increase of fluid flow velocity. Thus, one should pay sufficient attention to this phenomenon in the design. Furthermore, the tensile variation of the SCR with the depth is calculated and analyzed. Considering the variation of the tension, the natural frequencies of the SCR is calculated. The influence of bending stiffness of the SCR on the natural frequency of the riser is analyzed. The results show that bending stiffness has little effect on the first 10-order frequencies. Therefore, it can be ignored in calculating the low-frequency mode vortex-induced vibration.

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Slipway noise control and prediction of noise reduction

LI Zheng-guang;DI Guo-qing;SHI Xiang;ZHENG Yue

2011, 31 (2): 52-55. DOI: 10.3969/j.issn.1006-1355-2011.02.013

Abstract （2160）

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Some measures for noise control of slipway and prediction of noise reduction effect are proposed. An actual case of slipway noise control is taken as an example. According to the characteristic of the slipway noise, a noise source model is built, and the noise reduction effect of these measures for noise control is predicted. The results show that the comprehensive treatment, including sound source control, sound transmission control and production management, is necessary to control the noise. In addition to considering the noise reduction effect, engineering feasibility, cost as well as social factors also need to be considered in building the sound barriers. This work provides a reference for slipway noise control and prediction.

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《Vibration Measurement and Analysis of Main Reducer Hypoid Gear of Vehicles Rear Axle》

HAN Shao-jun;ZHANGBing-wei;LI Zheng-tian;WAN Shang-gao

2010, 30 (4): 125-128. DOI: 10.3969/j.issn.1006-1355.2010.04.033

Abstract （2146）

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The main reducer hypoid gear of vehicle's rear axle and the frequency spectrum method are briefly introduced. Then the design of the testing system of the main reducer hypoid gear and its testing method are elaborated. The results of the testing are analyzed with the method of frequency spectrum, and the main reasons of the vibration of the main reducer hypoid gear are researched. A scientific basis is provided for reducing the vibration and noise of main reducer hypoid gear.