【摘要】 次级声源数目、位置和声源强度的选择是设计变压器有源降噪系统的核心环节。针对变压器降噪应用环境,建立了半自由空间声场辐射模型;选定局部空间声压平方和作为控制系统的目标函数,采用遗传算法优化出相应数目次级声源的布放位置,利用解析法求出相应位置的最优次级源强度。对优化结果的分析表明,随着次级声源数目的增加,声源间的横向和纵向间距呈减小趋势,而且次级声源阵列要尽量靠近初级声源。相同次级声源布放参数下,待消声平面的不同位置降噪效果也不同。100 Hz单频物理实验的结果验证了优化布放参数的有效性。更多还原

【Abstract】 The choice of the parameters of the secondary sound sources including the number,the layout and the strengths of the sound sources are key parts in the design of active noise control system of power transformer. Considering the practical application environment of transformer noise control,an acoustic radiation model in half-free space is established. After selecting the sum of the squared sound pressures of the observation points as the objective function of the control system,the layout of secondary sound source is optimized by genetic algorithm and the optimal strengths of the sound sources are resolved by the analytical method. It is found from the optimization results that the distances of the horizontal and longitudinal space between two adjacent secondary sources will gradually decrease when the number of secondary sources increases,and the secondary sound sources array should be close to the primary sound sources as much as possible regardless of the number of secondary sound sources. Under the same condition of the secondary sound sources,the effect of noise reduction varies with the noise plane to be reduced. A 100 Hz single frequency experiment verifies the effectiveness of the optimized layout and the strength of the sound source.更多还原