直九直升机机内通话噪音问题分析  

Analysis of Intercommunication System Noise in Z-9 Helicopters

作　　者：李继国 王宝林 

机构地区：[1]中航工业哈飞飞机设计研究所,黑龙江哈尔滨150066

出　　处：《电子机械工程》2013年第3期13-16,共4页Electro-Mechanical Engineering

摘　　要：直九直升机存在交流用电设备干扰机内通话问题,现象为在耳机中可以听到交流噪声。为了解决该问题,文中对机内通话器的电源电路和音频电路进行了分析,计算了共阻耦合、电容耦合、电感耦合分量,根据计算分析结果确定用隔离和减小共地电阻的方法来解决该问题。实施结果表明该方法可以有效解决交流电干扰机通问题。文中指出对于机通等低频小信号模拟设备电路,共阻耦合和电感耦合是主要的干扰路径,在设计中应采取隔离和减小共阻等措施来减小干扰。The AC noise in the intercommunication system is a problem of the Z9 helicopters, with the phe nomenon of boring noise in the headphone. In order to solve the problem, the wires of the power and the voice in the intercommunication system are analyzed, and the quantity of resistor coupling, capacitive coupling and inductive coupling are calculated. The methods of isolation and reducing the sharing resistance are used to solve the problem. The result shows that the methods can solve the problem effectively. It is pointed out that the major interferential path of lower frequency circuit is the resistor coupling and the inductive coupling and that electromagnetic interference should be reduced by isolation wires and decreasing the sharing resistance in the design.

关 键 词：电磁兼容 电阻耦合 电容耦合 电感耦合 

分 类 号：TN911.4[电子电信—通信与信息系统]