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为了验证频率搅拌的有效性,论述了混响室的特征参数和频率搅拌的关键参数,并对频率搅拌的有效性进行了简要的理论分析。运用FEKO软件进行了建模仿真,依据场均匀性容差标准检验了场均匀性,采用假设检验方法研究了统计特性。设置对比试验,测量了某混响室在机械搅拌和频率搅拌这2种方式下的最低可用频率。结果表明:中心频率f=150MHz时总体标准偏差σt=2.71dB,f=200MHz时σt=2.27dB,场均匀性符合标准规定的容差要求,且仿真结果符合理论分布的统计特性;随着频率升高,场均匀性和统计特性都会改善;试验得出在机械搅拌和频率搅拌方式下混响室的最低可用频率大致相同,机械搅拌方式下场均匀性更好一些。从而验证了采用扫频方式实现频率搅拌的有效性,为进一步研究频率搅拌奠定了基础。
In order to verify the effectiveness of frequency agitation, the characteristic parameters of reverberation chamber and the key parameters of frequency agitation are discussed. The effectiveness of frequency agitation is briefly analyzed. The FE simulation software was used to simulate the field uniformity according to field uniformity tolerance standard. The statistical properties were studied by hypothesis testing. Set the contrast test, measuring a room reverb in the mechanical stirring and frequency mixing of these two ways the lowest available frequency. The results show that the overall standard deviation σt = 2.71dB at f = 150MHz and σ = 2.27dB at f = 200MHz. The field uniformity conforms to the standard tolerance requirements and the simulation results accord with the statistical characteristics of theoretical distribution. With the frequency The uniformity, the uniformity and the statistical properties of the chamber will be improved. The minimum usable frequencies of the reverberation chambers in the mechanical and frequency agitations are almost the same, and the uniformity of the field under mechanical agitation is better. Thus verifying the effectiveness of using frequency sweeping to achieve frequency agitation, which laid the foundation for further research on frequency agitation.