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Influence of rotor solidity on trailing edge noise from wind turbine blades

Advances in Aerodynamics 2020年第1期2卷 301-320页

作者： asishta Bhargava Nukala Satya Prasad Maddula Department of Mechanical Engineering Sreyas Institute of Engineering and TechnologyNagoleHyderabadTelanganaIndia Department of Aerospace Engineering GITAM School of TechnologyPatancheruTelanganaIndia

Noise prediction from streamlined bodies such as wind turbine blades can be predicted accurately using CFD computations that use spatio-temporal turbulence models at the expense of high computational *** this work,empirical methods proposed from BPM,Grosveld and Lowson are used to compute numerically to analyse the influence of rotor solidity factor on broadband trailing edge noise from a 2 MW horizontal axis wind turbine with a blade length of 37 *** to acoustic solver are the velocity vector field and boundary layer data which are obtained using blade element momentum and *** outputs from acoustic solver are directivity and far field sound pressure on a receiver located at distance of 120m from tower *** results have shown that for a wind speed of 10 m/s measured at 10m above ground,sound power level was found to increase between mid-bands to high frequencies for all three *** solidity effect was illustrated at constant rotational speed of 17 RPM and receiver height of 0.5m located in downwind position.A minimum difference of 1.5dBA was found at f~100 Hz for Lowson method and maximum of~2.8dBA at 1 kHz between two and three blade *** BPM and Grosveld methods however,the sound levels were~5dBA lower for two blade rotor than three blade rotor between f~100 Hz and f~1 *** study also demonstrated that as number of blades increase by integral multiples,the effect on noise radiation from trailing edge of blades increase by 2-5dBA due to amplitude modulation.

关键词： sound power Boundary layer Wind turbine Blade Trailing edge

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A hybrid magnetostrictive-piezoelectric barrel-stave projector

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Chinese Journal of Acoustics 2006年第4期25卷 371-377页

作者： CHAI Yong MO Xiping LIU Yongping CUI Zheng Institute of Acoustics Chinese Academy of Sciences Beijing 100080 Graduate School of the Chinese Academy of Sciences Beijing 100029

A hybrid magnetostrictive-piezoelectric barrel-stave projector is designed and developed. The new type transducer is driven by the union of rare-earth giant magnetostrictive material Terfenol-D and PZT piezoelectric ceramic. Combining the advantages of low frequency performance within a compact size, it proves that the hybrid projector has a much broader band and higher sound power than that with single magnetostrictive or piezoelectric driver by the simulated and measured results. The prototype of the hybrid projector has a size of 88 mm in outside diameter and 316 mm in length, with an underwater resonant frequency of 1.30 kHz, Q factor of 1.43 for -3 dB bandwidth, and transmitting voltage response level of 135.1 dB at the resonant frequency.

关键词： resonant frequency giant magnetostrictive piezoelectric ceramic low frequency sound power the union new type

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Error sensing strategy for active acoustic structure based on distributed displacement sensors

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Chinese Journal of Acoustics 2007年第3期26卷 235-245页

作者： CHEN Ke'an CHEN Guoyue LI Shuang PAN Haoran College of Marine Northwestern Polytechnical University Xi'an 710072 Faculty of System Science and Technology Akita Prefectural University 84-4 Ebinokuchi Tsuchiya Honjo Akita 015-0055 Japan)

The nearfield error sensing approach, which is one of the key problems encountered in the implementation of active acoustic structure, is investigated theoretically. The basic idea involves a limited number of PVDF film pairs be boned to the surface of the primary panel and secondary panels for measuring the total radiated sound power. In this paper, first, a theoretical model associated with the active acoustic structure is established. Second, the formulae for the shape coefficient of the PVDF pairs are derived based on the acoustic radiation modes and a PVDF sensing model. Finally, a number of computer simulations are performed and the shape of the PVDF pairs and corresponding reduction in the radiated sound power are calculated. The results demonstrate the feasibility of the proposed nearfield error sensing strategy.

关键词： sound power computer simulations acoustic radiation theoretical model

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The design and dynamic performance of a moment actuator

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Chinese Journal of Acoustics 1995年第2期14卷 127-132页

作者： QIU Shuye and B. M. Gibbs (Physics Department, Shantou Uaiversity. Shantou 515063)Acoustics Research Unit, Livcrpool University, P. O. Box. 147, L69 3BX, U.K.

It is increasingly recognized that machines and other vibrational sources can impart structure-borne sound power into supporting and connected structures through rotational components of excitation as well as translational components. It is well known that the rotational components are difficult to cstimate since moments are not easy to generate and measure. In this paper a prototype moment actuator is discussed. It consists of two parallel rods of giant magnctostrictive matcrial. The performance of the actuator has been investigated by means of a transfer function involving magnitude and phase. A quantity, 'purity of moment excitation', has been proposed to estimate the ability of the actuator to impart moments.

关键词： sound power Rotational component Moment actuator

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