摘要
UAV集电子设备于一身,其最大射频电磁干扰(EMI)源自发动机点火系统,它不同程度地影响着机载计算机、自动驾驶仪等以及不同任务载荷的正常工作;通过对某UAV发动机研制的电容放电式点火系统(CDI)的电路和布局描述,研讨了屏蔽对其二次回路影响的机理,合理确定了工程路径,并研究出一种阻尼-屏蔽法实施在CDI中,降低点火系统EMI近20dB,同时不影响其可靠性;本研究的成功,使长期困扰CDI的EMI深入抑制取得了进步。
UAV systems bearing the complexities of integrated avionics are susceptible to the disturbance of electromagnetic interferences（EMI）,that are typically originated from the ignition systems of UAV engines.The presence of EMI can deleteriously affect the functionality of the UAV computing units,auto piloting units,and various mission payloads etc.In this paper,by using the a novel electric design based on the capacitor-discharging ignition（CDI） circuits,we investigate the mechanism of the influence of electrical shielding on its second circuits,which facilitates the rational engineering designs.We focus on utilizing a damping-shielding-restraining methodology for the CDI,which greatly reduces the EMI of the ignition systems down to 20 dB with remaining the durability of the operation.Out results provide one strategy to efficiently restrain the undesirable EMI in the CDIs.
出处
《计算机测量与控制》
CSCD
北大核心
2012年第1期259-262,272,共5页
Computer Measurement &Control
基金
国家高技术研究发展计划863项目(2008AA860015)
