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摘要: 采用大涡模拟方法和FW-H声学模型对车用交流发电机气动噪声进行数值模拟, 采用矢量合成方法优化交流发电机前扇叶分布角度, 以低噪声、高流量与优化频谱结构降低单频旋转噪声为目标, 分析了交流发电机气动噪声特性。分析结果表明: 交流发电机噪声声压级、主要影响阶次与幅值的数值模拟与试验结果有很好的一致性; 交流发电机气动噪声源为前后扇叶, 总噪声的主要影响阶次为第6、8、10、12、18阶次, 主要能量集中在1 120~5 600Hz范围内; 总噪声最大预测误差为6.97dB, 第12、18阶次旋转噪声预测误差分别为2.30、3.30dB; 前扇叶分布角度优化后总噪声最大降幅为3.10dB, 平均降幅为2.58dB, 第12、18阶次噪声平均降幅为5.80dB, 降噪效果明显。Abstract: The large eddy simulation method and the FW-H acoustic model were adopted to simulate the aerodynamic noise of vehicle alternator.The vector composition method was used to optimize the front-blade distribution angle of alternator.Aiming at low noise, high flow and optimizing spectrum structure to reduce the single-frequency rotational noise, the aerodynamic noise properties of alternator were analyzed.Analysis result shows that the numerical simulation and test results have good consistencies on sound pressure level, main influencing orders and magnitudes of alternator noise.The aerodynamic noise sources of vehicle alternator are front and back blades.The main influencing orders of overall noise are orders 6, 8, 10, 12 and 18, and the main energy centers on 1 120-5 600 Hz.The maximum prediction error of overall noise is 6.97 dB, and the prediction errors of rotational noise on orders 12 and 18 are 2.30 dB and 3.30 dB respectively.After optimizing the front-blade distribution angle of alternator, the maximum decreasing amount of overall noise is 3.10 dB, the average decreasing amount is 2.58 dB, the average decreasing amounts of noise on orders 12 and 18 are 5.80 dB, so the noise reduction effect is remarkable.
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Key words:
- vehicle engineering /
- alternator /
- aerodynamic noise /
- large eddy simulation /
- vector composition /
- fan blade
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表 1 噪声对比结果
Table 1. Comparison result of noises
表 2 分布角度
Table 2. Distribution angles
表 3 声压级对比结果
Table 3. Comparison result of noise levels
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[1] 张亚东, 董大伟, 闫兵, 等. 车用交流发电机气动噪声试验研究[J]. 噪声与振动控制, 2014, 34(3): 107-110, 123. doi: 10.3969/j.issn.1006-1335.2014.03.022ZHANG Ya-dong, DONG Da-wei, YAN Bing, et al. Experiment study on aerodynamic noise of an automotive alternator[J]. Noise and Vibration Control, 2014, 34(3): 107-110, 123. (in Chinese). doi: 10.3969/j.issn.1006-1335.2014.03.022 [2] MATHER J S B, SAVIDGE J, FISHER M J. New observations on tone generation in fans[J]. Journal of Sound and Vibration, 1971, 16(3): 407-418. doi: 10.1016/0022-460X(71)90596-7 [3] FITZGERALD J M, LAUCHLE G C. Reduction of discrete frequency noise in small, subsonic axial-flow fans[J]. Journal of the Acoustical Society of America, 1984, 76(1): 158-166. doi: 10.1121/1.391112 [4] SUH S J, CHUNG J, LIM B D, et al. Case history: noise source identification of an automobile alternator by RPM dependent noise and vibration spectrum analysis[J]. Noise Control Engineering Journal, 1991, 37(1): 31-36. doi: 10.3397/1.2827792 [5] 刘敏, 董大伟, 闫兵, 等. 车用交流发电机噪声特性及噪声源测试分析[J]. 重庆理工大学学报: 自然科学, 2010, 24(6): 13-17. doi: 10.3969/j.issn.1674-8425-B.2010.06.004LIU Min, DONG Da-wei, YAN Bing, et al. Test and analysis of noise characteristics and noise source of vehicle alternator[J]. Journal of Chongqing University of Technology: Natural Science, 2010, 24(6): 13-17. (in Chinese). doi: 10.3969/j.issn.1674-8425-B.2010.06.004 [6] 张亚东. 车用交流发电机气动噪声特性分析与降噪研究[D]. 成都: 西南交通大学, 2014.ZHANG Ya-dong. Study on characteristics analysis and control of aeroacoustics of automotive alternator[D]. Chengdu: Southwest Jiaotong University, 2014. (in Chinese). [7] LIGHTHILL M J. On sound generated aerodynamically. Ⅰ. general theory[J]. Proceedings of the Royal Society of London, Series A, Mathematical and Physical Sciences, 1952, 211: 564-587. [8] CURLE N. The influence of solid boundaries upon aerodynamic sound[J]. Proceedings of the Royal Society of London, Series A, Mathematical and Physical Sciences, 1955, 231: 505-514. [9] FFOWCS-WILLIAMS J E, HAWKINGS D L. Sound generation by turbulence and surfaces in arbitrary motion[J]. Philosophical Transactions of the Royal Society of London, Series A, Mathematical and Physical Sciences, 1969, 264: 321-342. [10] FREDERICK D M, LAUCHLE G C. Aerodynamically-induced noise in an automotive alternator[J]. Noise Control Engineering Journal, 1995, 43(2): 29-37. doi: 10.3397/1.2828362 [11] BRUNGART T A, MEYER G A, LAUCHLE G C. Flow in automotive alternators[J]. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, 1996, 210(4): 283-292. doi: 10.1243/PIME_PROC_1996_210_275_02 [12] KIM W, JEON W H, HUR N, et al. Development of a low noise cooling fan for an alternator using numerical and DOE methods[J]. International Journal of Automotive Technology, 2011, 12(2): 307-314. doi: 10.1007/s12239-011-0036-6 [13] NEISE W. Review of noise reduction methods for centrifugal fans[J]. Journal of Engineering for Industry, 1982, 104(2): 151-161. doi: 10.1115/1.3185810 [14] NEISE W. Noise rating of fans on the basis of the specific sound power level[C]∥AFMS. 10th Australasian Fluid Mechanics Conference. Melbourne: AFMS, 1989: 1-44. [15] BASSI F, CRIVELLINI A, REBAY S, et al. Discontinuous Galerkin solution of the Reynolds-averaged Navier-Stokes and k-ωturbulence model equations[J]. Computers and Fluids, 2005, 34(4/5): 507-540. [16] 崔桂香, 许春晓, 张兆顺. 湍流大涡数值模拟进展[J]. 空气动力学学报, 2004, 22(2): 121-129. doi: 10.3969/j.issn.0258-1825.2004.02.001CUI Gui-xiang, XU Chun-xiao, ZHANG Zhao-shun. Progress in large eddy simulation of turbulent flows[J]. Acta Aerodynamica Sinica, 2004, 22(2): 121-129. (in Chinese). doi: 10.3969/j.issn.0258-1825.2004.02.001 [17] SPALART P R, JOU W H, STRELETS M, et al. Comments on the feasibility of LES for wings, and on a hybrid RANS/LES approach[C]∥AFOSR. 1st AFOSR International Conference on DNS/LES. Washington DC: AFOSR, 1997: 4-8. [18] 郝豫川, 周远波, 谢荣基. 西南交通大学汽车电机声功率测试实验室检测报告[R]. 成都: 中国测试技术研究院, 2010.HAO Yu-chuan, ZHOU Yuan-bo, XIE Rong-ji. Test reports of vehicle motor sound power measurement laboratory for Southwest Jiaotong University[R]. Chengdu: National Institute of Measurement and Testing Technology, 2010. (in Chinese). [19] 辛阳, 董大伟, 闫兵, 等. 汽车用发电机NVH性能测试声学实验室设计及鉴定[J]. 噪声与振动控制, 2012, 32(3): 147-151. doi: 10.3969/j.issn.1006-1355.2012.03.034XIN Yang, DONG Da-wei, YAN Bing, et al. Design and appraisal of acoustics laboratory for NVH performance test of vehicle's alternators[J]. Noise and Vibration Control, 2012, 32(3): 147-151. (in Chinese). doi: 10.3969/j.issn.1006-1355.2012.03.034 [20] WANG Yuan-wen, DONG Da-wei, XIE Xiao, et al. Spectral optimization of fan rotation noise based on vector composition method[J]. Key Engineering Materials, 2014, 584: 131-136. -
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