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研究了非等间距高频波导组成的线阵列的远场垂直指向性。提出了更符合实际应用的高频波导线阵列非等间距排列模型。通过分析同相点声源阵列的指向性,结合扬声器线阵列乘积理论得到了计算所提出模型远场垂直指向性的方法,对模型进行了有限元仿真,并实验验证了理论计算值的准确性,最后分析了高频波导线阵列非等间距排列对指向性的影响。结果表明:该方法简单有效。在有效辐射率相等的情况下,非等间距高频波导线阵列与等间距线阵列的远场指向性主瓣差异很小。
The far-field vertical directivity of a linear array of non-equally spaced high frequency waveguides was studied. A more accurate non-equidistant arrangement model of high frequency waveguide array is proposed. By analyzing the directivity of the in-phase sound source array and combining with the product theory of loudspeaker line array, a method to calculate the far-field vertical directivity of the proposed model is obtained. The finite element simulation of the model is carried out. The accuracy of the theoretical calculation is verified by experiments. Finally, the influence of non-equidistant arrangement of high frequency waveguide array on the directivity is analyzed. The results show that this method is simple and effective. In the case of equal effective emissivity, there is very little difference between the far-field directional mainlobe of the non-equidistant high frequency waveguide array and the equidistance line array.