电力变压器缩尺模型振动试验及其声学模型

发布时间：2018-01-29 18:30

本文关键词： 电力变压器振动试验缩尺比例模型噪声预测相干虚源法半开空间　出处：《振动.测试与诊断》2016年06期 　论文类型：期刊论文

【摘要】：首先,根据某电力变压器的缩尺比例模型在不同激振频率下箱壁振动相位和振幅的测试结果,得出当激振频率超过7阶模态频率时,其相位和振幅呈随机分布的结论,确定了电力变压器简化为点声源的划分形式;其次,建立了户外半开空间内电力变压器相干虚源模型,该模型考虑了声线多次反射形成的无限个虚源之间的干涉效应;最后,应用该相干虚源模型对存在相位关系的电力变压器组辐射声场进行计算,通过与边界元模型、ISO9613模型计算结果与实测值进行对比。结果表明,该相干虚源预测模型因考虑了相位信息,能反映出声波在不同位置处的传播趋势,比原有的ISO9613模型更为准确,验证了所提理论模型的可行性。
[Abstract]:Firstly, according to the measured results of the vibration phase and amplitude of a certain power transformer under different exciting frequencies, it is obtained that when the exciting frequency exceeds the 7th order mode frequency. Based on the conclusion that the phase and amplitude are randomly distributed, it is determined that the power transformer is simplified as the division form of point sound source. Secondly, the coherent virtual source model of power transformer in outdoor semi-open space is established, which takes into account the interference effect between infinite virtual sources formed by multiple reflection of sound lines. Finally, the coherent virtual source model is used to calculate the radiated sound field of the power transformer group with phase relationship, and the model is based on the boundary element model. The calculated results of the ISO9613 model are compared with the measured values. The results show that the prediction model can reflect the propagation trend of acoustic waves at different locations because of the phase information taken into account in the prediction model. It is more accurate than the original ISO9613 model, and the feasibility of the proposed theoretical model is verified.
【作者单位】：合肥工业大学噪声与振动工程研究所;安徽理工大学机械学院;
【基金】：国家“十一五”科技支撑计划资助项目(2006BAA02A21)
【分类号】：TM41
【正文快照】： 引言变压器是连续工作的,它产生的噪声是人耳较为敏感的低频噪声。随着城市用电需求的不断增加,电力变压器运行造成的环境影响与人民群众逐步增长的环保意识间的矛盾日益突出[1]。目前,变压器的研究主要包括变压器振动和噪声的产生机理、声学特性、降噪措施以及相关的环保标准

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