【作者】 周香；

【导师】 蒋全兴；

【作者基本信息】 东南大学 ， 机械电子工程， 2005， 博士

【摘要】 该文以理论、数值计算与实验相结合的方法分析了混波室的统计模型、搅拌器配置及不同加载情况对混波室性能的影响、局部平均效应对混波室测试结果的影响和混波室在电磁兼容测试中的应用,主要的研究内容有以下几个方面:1.推导了混波室一维及三维场的场强和功率的概率密度函数等统计特性,并在已建成的国内第一个混波室中进行了实验验证。2.分析如何建立混波室的FDTD模型,验证所建模型的正确性;用FDTD方法实验方法分析了不同搅拌器大小形状对混波室性能的影响;实验分析搅拌器组合对混波室性能的影响。3.从K-S拟合度测试和相关性两个方面实验分析不同加载量对混波室性能的影响;数值和实验分析加载不同大小的金属EUT对混波室性能的影响。4.分析天线口径和搅动步长对混波室性能测试的影响,并从方差系数及各向异性系数等方面来量化这种影响,并给出了天线口径和搅动步长对混波室性能测试影响的实验分析。5.理论分析在混波室中进行的辐射发射测试与在其它场地中进行测试之间的对应关系,实验对比分析了在混波室和GTEM小室中进行辐射发射测试的相关性;分析如何在混波室中进行辐射敏感度测试,并与开阔场中的敏感度测试进行比较;讨论了混波室在屏蔽效能测试中的应用。论文中得出的主要结论为:1.不对称的搅拌器有利于提高搅拌器效率;搅拌器至少有一维尺寸大于一个波长,但搅拌器设计时仅考虑一维尺寸远远不够,要综合考虑三维尺寸和搅拌体积。2.一个作用效果好的搅拌器加上一个作用效果差的搅拌器并不能明显改善其总体作用效果,但用两个作用效果不佳的搅拌器共同作用会显著提高搅拌器的效率;可通过改变搅拌器的转动角度比来改善搅拌器的总体作用效果。3.一定量的加载会使混波室的各项性能指标提高,但进一步加载会增加相关性,减少独立采样数;加载金属EUT时,虽然其对混波室加载可能较小,但会影响混波室的场均匀性。4.用进行混波室校准或用混波室进行电磁兼容测试时,必须考虑天线口径大小和搅动步长对测试的影响。5.在混波室中和在GTEM中辐射发射的测试结果一致性很好,混波室能够作为辐射发射测试的替代场地。文中理论结果、数值计算结果和实验结果基本吻合。本文的工作有助于混波室的设计及其在电磁兼容测试中的应用。更多还原

【Abstract】 The statistical model of reverberation chamber (RC) is derived. The effects of stirrer(s) and loading on the performance of RC are analyzed by numerical method and experiment. The effect of local average effect on the results of RC test and the application of RC in EMC test are analyzed. The main researchers in this thesis are listed as follow:1. The probability distribution functions of field and power of RC are derived and compared to the results of experiment to prove its validity.2. The effects of size and shape of stirrer(s) on performance of RC are researched by FDTD method and experiment. The effects of stirrer combination on RC performance are discussed.3. The effects of the loading quantity and the metal EUT size on RC performance are studied from K-S goodness fit test and correlation.4. The effects of antenna size and stirring step size on RC performance are analyzed by theory and experiment.5. The relations between radiated emission test in RC and in other test field are derived. The correlation between radiated emission test in RC and in GTEM cell is analyzed by experiment. The radiated susceptibility test in RC is compared to that in OATS. The application of RC in shielding effect test is discussed.The important results obtained from the thesis include:1. The asymmetric stirrer(s) improve the stirrer efficiency. At least one dimension size of stirrer(s) is larger than one wavelength, but this is not enough. Three dimension size and stirring volume must be considered.2. Adding a bad effective stirrer to a good effective stirrer can’t improve the total effect, but the combination of two bad effective stirrers can improve the effect.3. Proper load will make RC performance better, but excessive load will reduce the quantity of dependent sample. For the loss of metal EUT is small, the field uniformity of RC may be influenced when large mental EUT is placed in RC.4. The influence of antenna size and stirrer(s) step on test must be considered in RC calibration and EMC test in RC.5. The radiation emission test results obtained from RC are consistent with those from GTEM., so RC can be used as alternative test field for radiation emission.The measured results agree well with the calculated ones. The results obtained in this thesis are contributive to EMC test and the design of TEM cell or GTEM cell.更多还原